Initial commit

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'com.aldo.apps.familyhelpers'
+    compileSdk 34
+
+    defaultConfig {
+        applicationId "com.aldo.apps.familyhelpers"
+        minSdk 32
+        targetSdk 34
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'com.google.android.material:material:1.12.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.2.0'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/aldo/apps/familyhelpers/ExampleInstrumentedTest.java

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+package com.aldo.apps.familyhelpers;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.aldo.apps.familyhelpers", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.MyApplication"
+        tools:targetApi="31">
+        <activity
+            android:name=".HelperGridActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service android:name=".workers.SleepTimerHelper" android:foregroundServiceType="specialUse"/>
+
+        <receiver android:name="com.aldo.apps.familyhelpers.DoerflingerHelpersDeviceAdminReceiver"
+            android:permission="android.permission.BIND_DEVICE_ADMIN"
+            android:exported="true">
+            <meta-data
+                android:name="android.app.device_admin"
+                android:resource="@xml/device_admin" />
+            <intent-filter>
+                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
+                <action android:name="android.app.action.DEVICE_ADMIN_DISABLED" />
+            </intent-filter>
+        </receiver>
+    </application>
+
+</manifest>

app/src/main/java/com/aldo/apps/familyhelpers/DoerflingerHelpersDeviceAdminReceiver.java

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+package com.aldo.apps.familyhelpers;
+
+import android.app.admin.DeviceAdminReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+public class DoerflingerHelpersDeviceAdminReceiver extends DeviceAdminReceiver {
+    @Override
+    public void onEnabled(final Context context,final  Intent intent) {
+        // Called when the app is enabled as a device administrator.
+    }
+
+    @Override
+    public void onDisabled(final Context context, final Intent intent) {
+        // Called when the app is disabled as a device administrator.
+    }
+}

app/src/main/java/com/aldo/apps/familyhelpers/HelperGridActivity.java

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+package com.aldo.apps.familyhelpers;
+
+import static android.Manifest.permission.POST_NOTIFICATIONS;
+
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.util.Log;
+import android.widget.Toast;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+
+import com.aldo.apps.familyhelpers.ui.HelperGroupTile;
+import com.aldo.apps.familyhelpers.ui.SleepTimerPopup;
+import com.aldo.apps.familyhelpers.utils.DevicePolicyManagerHelper;
+
+/**
+ * The Activity showing the Grid of helpers to select from.
+ */
+public class HelperGridActivity extends AppCompatActivity {
+
+    /**
+     * Tag for debugging purpose.
+     */
+    private static final String TAG = "HelperGridActivity";
+
+    /**
+     * {@link HelperGroupTile} holding the option for a sleep timer.
+     */
+    private HelperGroupTile mSleepTimerTile;
+
+    /**
+     * Instance of the {@link DevicePolicyManagerHelper} to roll out device specific actions.
+     */
+    private DevicePolicyManagerHelper mDevicePolicyHelper;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        mDevicePolicyHelper = DevicePolicyManagerHelper.getInstance(this);
+        initSleepTimer();
+    }    /**
+     * The {@link ActivityResultLauncher} to ask for the NotificationPermission.
+     */
+    private final ActivityResultLauncher<String> mRequestPermissionLauncher =
+            registerForActivityResult(new ActivityResultContracts.RequestPermission(), isGranted -> {
+                if (isGranted) {
+                    // Permission granted, you can post notifications
+                    mSleepTimerTile.launchHelper();
+                } else {
+                    // Permission denied, handle accordingly
+                    Toast.makeText(HelperGridActivity.this, R.string.sleep_timer_show_notifications_rationale,
+                            Toast.LENGTH_LONG).show();
+                    requestNotificationPermission();
+                }
+            });
+
+    /**
+     * Helper method to initialize the sleepTimer tile.
+     */
+    private void initSleepTimer() {
+        mSleepTimerTile = new HelperGroupTile(findViewById(R.id.tile_sleep_timer)) {
+            @Override
+            public void launchHelper() {
+                // First check if the notification permission is granted
+                if (!requestNotificationPermission()) {
+                    Log.d(TAG, "launchHelper: Notifications not allowed, return...");
+                    return;
+                }
+                // Second check for the app to be registered as DeviceAdmin
+                if (!mDevicePolicyHelper.isDeviceAdmin()) {
+                    Toast.makeText(HelperGridActivity.this, R.string.warning_no_device_admin,
+                            Toast.LENGTH_LONG).show();
+                    mDevicePolicyHelper.requestDeviceAdminPrivileges(HelperGridActivity.this,
+                            R.string.sleep_timer_rationale_device_admin);
+                    return;
+                }
+                // If both previous checks pass, launch the actual sleep timer dialog.
+                final SleepTimerPopup sleepTimerPopup = new SleepTimerPopup(HelperGridActivity.this);
+                sleepTimerPopup.showTimePicker();
+                Log.d(TAG, "launchHelper: Clicked SleepTimer");
+            }
+        };
+        mSleepTimerTile.setLogo(R.drawable.icn_sleep_timer);
+        mSleepTimerTile.setTitle(R.string.title_sleep_timer);
+    }
+
+    /**
+     * Helper method to request the NotificationPermission as it is required for the service to run.
+     *
+     * @return true if the permission is granted, false otherwise.
+     */
+    private boolean requestNotificationPermission() {
+        if (ContextCompat.checkSelfPermission(this, POST_NOTIFICATIONS) ==
+                PackageManager.PERMISSION_GRANTED) {
+            // Permission already granted
+            return true;
+        } else {
+            if (shouldShowRequestPermissionRationale(POST_NOTIFICATIONS)) {
+                Toast.makeText(HelperGridActivity.this, R.string.sleep_timer_show_notifications_rationale,
+                        Toast.LENGTH_LONG).show();
+            }
+            mRequestPermissionLauncher.launch(POST_NOTIFICATIONS);
+            return false;
+        }
+    }
+
+
+}

app/src/main/java/com/aldo/apps/familyhelpers/ui/HelperGroupTile.java

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+package com.aldo.apps.familyhelpers.ui;
+
+import android.content.Context;
+import android.util.Log;
+import android.view.View;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.DrawableRes;
+import androidx.annotation.StringRes;
+
+import com.aldo.apps.familyhelpers.R;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * Helper class to avoid boiler plate code for inflating more and more helper tiles.
+ * Abstracts the inflation of the logo and the title and offers a way to handle the click.
+ */
+public abstract class HelperGroupTile implements View.OnClickListener {
+
+    /**
+     * Tag for debugging purpose.
+     */
+    private static final String TAG = "HelperGroupTile";
+
+    /**
+     * The Logo of the Helper group.
+     */
+    private final ImageView mHelperLogo;
+
+    /**
+     * The title of the Helper group.
+     */
+    private final TextView mHelperTitle;
+
+    /**
+     * The {@link WeakReference} of the {@link Context} from where this was instantiated.
+     */
+    private WeakReference<Context> mContextRef;
+
+    /**
+     * The name of the helper, mainly used for logging purpose.
+     */
+    private String mHelperName;
+
+    /**
+     * C'tor.
+     *
+     * @param rootLayout The previously inflated view of the root layout.
+     */
+    public HelperGroupTile(final View rootLayout) {
+        mContextRef = new WeakReference<>(rootLayout.getContext());
+        mHelperLogo = rootLayout.findViewById(R.id.iv_helper_group_icon);
+        mHelperTitle = rootLayout.findViewById(R.id.tv_helper_group_title);
+        rootLayout.setOnClickListener(this);
+    }
+
+    /**
+     * To be invoked when the tile is pressed.
+     */
+    public abstract void launchHelper();
+
+    /**
+     * Helper method to set the Name of the HelperGroup.
+     *
+     * @param titleId The {@link StringRes} id of the title to be shown.
+     */
+    public void setTitle(@StringRes final int titleId) {
+        final Context context = mContextRef.get();
+        if (context == null) {
+            Log.w(TAG, "setTitle: Null context provided, cannot continue");
+            return;
+        }
+        mHelperName = context.getString(titleId);
+        if (mHelperTitle != null) {
+            mHelperTitle.setText(titleId);
+        } else {
+            Log.d(TAG, "setLogo: Cannot set Logo for [" + mHelperName + "]");
+        }
+    }
+
+    /**
+     * Helper method to set the Name of the HelperGroup.
+     *
+     * @param groupTitle The String to be used as a title for the group.
+     */
+    public void setTitleString(final String groupTitle) {
+        mHelperName = groupTitle;
+        if (mHelperTitle != null) {
+            mHelperTitle.setText(groupTitle);
+        } else {
+            Log.d(TAG, "setLogo: Cannot set Logo for [" + mHelperName + "]");
+        }
+    }
+
+    /**
+     * Helper method to set the Logo of the HelperGroup.
+     *
+     * @param logoId The {@link DrawableRes} id of the logo to be shown.
+     */
+    public void setLogo(@DrawableRes final int logoId) {
+        if (mHelperLogo != null) {
+            mHelperLogo.setImageResource(logoId);
+        } else {
+            Log.d(TAG, "setLogo: Cannot set Logo for [" + mHelperName + "]");
+        }
+    }
+
+    @Override
+    public void onClick(final View view) {
+        Log.d(TAG, "onClick: Clicked on [" + mHelperName + "]");
+        launchHelper();
+    }
+}

app/src/main/java/com/aldo/apps/familyhelpers/ui/SleepTimerPopup.java

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+package com.aldo.apps.familyhelpers.ui;
+
+import static com.aldo.apps.familyhelpers.utils.GlobalConstants.SLEEP_TIMER_DURATION_MILLIS_EXTRA;
+
+import android.app.TimePickerDialog;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+import android.widget.TimePicker;
+
+import com.aldo.apps.familyhelpers.workers.SleepTimerHelper;
+
+import java.lang.ref.WeakReference;
+import java.util.Calendar;
+
+/**
+ * Helper class for the Popup to select a time where you want to have the screen locked.
+ */
+public class SleepTimerPopup {
+
+    /**
+     * Tag for debugging purpose.
+     */
+    private static final String TAG = "SleepTimerPopup";
+
+    /**
+     * {@link WeakReference} to the {@link Context} from where this was called.
+     */
+    private final WeakReference<Context> mContextRef;
+
+    /**
+     * C'tor.
+     *
+     * @param context The {@link Context} from where this was called.
+     */
+    public SleepTimerPopup(final Context context) {
+        mContextRef = new WeakReference<>(context);
+    }
+
+    /**
+     * Initializes and shows the time picker, pre-selected to the current time of the day.
+     */
+    public void showTimePicker() {
+        final Context context = mContextRef.get();
+        final Calendar calendar = Calendar.getInstance();
+        final int hour = calendar.get(Calendar.HOUR_OF_DAY);
+        final int minute = calendar.get(Calendar.MINUTE);
+
+        final TimePickerDialog timePickerDialog
+                = new TimePickerDialog(context, this::handleSelectedTime, hour, minute, true);
+        timePickerDialog.show();
+    }
+
+    /**
+     * Helper method to handle the selected time from the widget. Will calculate the milliseconds until
+     * the timer expires from now and start the actual {@link SleepTimerHelper}.
+     *
+     * @param view   Added for convenience purpose, not really needed.
+     * @param hour   The selected hour.
+     * @param minute The selected minute.
+     */
+    private void handleSelectedTime(final TimePicker view, final int hour, final int minute) {
+        Log.d(TAG, "handleSelectedTime() called with: hour = [" + hour + "], minute = [" + minute + "]");
+        final Calendar selectedTimeCalendar = Calendar.getInstance();
+        final Calendar nowCalendar = Calendar.getInstance();
+        selectedTimeCalendar.set(Calendar.HOUR_OF_DAY, hour);
+        selectedTimeCalendar.set(Calendar.MINUTE, minute);
+        // If the time is before now, add a day to make it expire tomorrow.
+        if (selectedTimeCalendar.before(nowCalendar)) {
+            Log.d(TAG, "handleSelectedTime: Selected a time in the past, adding a day");
+            selectedTimeCalendar.add(Calendar.DAY_OF_YEAR, 1);
+        }
+        final long differenceMillis = selectedTimeCalendar.getTimeInMillis() - nowCalendar.getTimeInMillis();
+        Log.d(TAG, "handleSelectedTime: Selected [" + differenceMillis + "] Milliseconds ");
+        final Context context = mContextRef.get();
+
+        final Intent sleepTimerServiceIntent = new Intent(context, SleepTimerHelper.class);
+        sleepTimerServiceIntent.putExtra(SLEEP_TIMER_DURATION_MILLIS_EXTRA, differenceMillis);
+        context.startForegroundService(sleepTimerServiceIntent);
+    }
+}

app/src/main/java/com/aldo/apps/familyhelpers/utils/DevicePolicyManagerHelper.java

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+package com.aldo.apps.familyhelpers.utils;
+
+import static android.content.Context.DEVICE_POLICY_SERVICE;
+
+import android.app.admin.DevicePolicyManager;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+
+import androidx.annotation.StringRes;
+
+import com.aldo.apps.familyhelpers.DoerflingerHelpersDeviceAdminReceiver;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * Helper class to wrap all the {@link DevicePolicyManager} related tasks into one singleton instead
+ * of instantiating it scattered all over the code.
+ */
+public final class DevicePolicyManagerHelper {
+
+    /**
+     * Tag for debugging purpose.
+     */
+    private static final String TAG = "DevicePolicyManagerHelper";
+
+    /**
+     * The singleton instance of this class.
+     */
+    private static DevicePolicyManagerHelper sInstance;
+
+    /**
+     * {@link WeakReference} to the {@link DevicePolicyManager} to apply actual system settings.
+     */
+    private final WeakReference<DevicePolicyManager> mDevicePolicyManagerRef;
+
+    /**
+     * The {@link ComponentName} of the {@link {@link DoerflingerHelpersDeviceAdminReceiver}}.
+     */
+    private final ComponentName mDeviceAdminReceiver;
+
+    /**
+     * Private C'Tor to prevent instantiation from outside.
+     *
+     * @param context The {@link Context} from where this was called.
+     */
+    private DevicePolicyManagerHelper(final Context context) {
+        mDevicePolicyManagerRef = new WeakReference<>((DevicePolicyManager) context.getSystemService(DEVICE_POLICY_SERVICE));
+        mDeviceAdminReceiver = new ComponentName(context, DoerflingerHelpersDeviceAdminReceiver.class);
+    }
+
+    /**
+     * Returns the singleton instance of the {@link DevicePolicyManagerHelper}.
+     *
+     * @param context The {@link Context} from where this was called.
+     *
+     * @return the singleton instance of the {@link DevicePolicyManagerHelper}.
+     */
+    public static DevicePolicyManagerHelper getInstance(final Context context) {
+        if (sInstance == null) {
+            Log.d(TAG, "getInstance: Creating new helper instance");
+            sInstance = new DevicePolicyManagerHelper(context);
+        }
+        return sInstance;
+    }
+
+    /**
+     * If not yet granted before, opens the settings page to grant deviceAdmin rights to the package.
+     *
+     * @param context       The {@link Context} from where this was called.
+     * @param explanationId The stringId of the explanation on why this is needed.
+     */
+    public void requestDeviceAdminPrivileges(final Context context, @StringRes final int explanationId) {
+        final String explanation = context.getString(explanationId);
+        final Intent intent = new Intent(DevicePolicyManager.ACTION_ADD_DEVICE_ADMIN);
+        intent.putExtra(DevicePolicyManager.EXTRA_DEVICE_ADMIN, mDeviceAdminReceiver);
+        intent.putExtra(DevicePolicyManager.EXTRA_ADD_EXPLANATION, explanation);
+        context.startActivity(intent);
+    }
+
+    /**
+     * Helper method to check whether the package was already registered as DeviceAdmin or not.
+     *
+     * @return true if package is approved deviceAdmin, false otherwise.
+     */
+    public boolean isDeviceAdmin() {
+        final DevicePolicyManager devicePolicyManager = mDevicePolicyManagerRef.get();
+        return devicePolicyManager.isAdminActive(mDeviceAdminReceiver);
+    }
+
+    /**
+     * Actually locks the screen when the sleepTimer expired.
+     *
+     * @return true, if the screen lock was performed, false otherwise.
+     */
+    public boolean lockScreen() {
+        final DevicePolicyManager devicePolicyManager = mDevicePolicyManagerRef.get();
+        if (isDeviceAdmin()) {
+            devicePolicyManager.lockNow();
+            return true;
+        }
+        return false;
+    }
+}

app/src/main/java/com/aldo/apps/familyhelpers/utils/GlobalConstants.java

@@ -0,0 +1,43 @@
+package com.aldo.apps.familyhelpers.utils;
+
+/**
+ * Utility class holding global constants to be used for the application.
+ */
+public final class GlobalConstants {
+
+    /**
+     * Private C'tor to prevent instantiation.
+     */
+    private GlobalConstants() {}
+
+    /**
+     * ID of the NotificationChannel for the SleepTimer Notification.
+     */
+    public static final String SLEEP_TIMER_CHANNEL_ID = "CountdownChannel";
+
+    /**
+     * Factor to calculate seconds from milliseconds and vice versa.
+     */
+    public static final int ONE_SECOND_IN_MILLIS = 1000;
+
+    /**
+     * Factor to calculate hours from minutes and vice versa.
+     */
+    public static final int ONE_HOUR_IN_MINUTES = 60;
+
+    /**
+     * The NotificationID of the SleepTimer notification.
+     */
+    public static final int SLEEP_TIMER_NOTIFICATION_ID = 1;
+
+    /**
+     * The key of the extra to be applied to the starting intent of the sleepTimer service,
+     * holding the initial duration in millis.
+     */
+    public static final String SLEEP_TIMER_DURATION_MILLIS_EXTRA = "sleep_timer_duration";
+
+    /**
+     * Action to cancel an ongoing sleep timer.
+     */
+    public static final String SLEEP_TIMER_CANCEL_ACTION = "SLEEP_TIMER_CANCEL";
+}

app/src/main/java/com/aldo/apps/familyhelpers/workers/SleepTimerHelper.java

@@ -0,0 +1,189 @@
+package com.aldo.apps.familyhelpers.workers;
+
+import static com.aldo.apps.familyhelpers.utils.GlobalConstants.ONE_HOUR_IN_MINUTES;
+import static com.aldo.apps.familyhelpers.utils.GlobalConstants.ONE_SECOND_IN_MILLIS;
+import static com.aldo.apps.familyhelpers.utils.GlobalConstants.SLEEP_TIMER_CANCEL_ACTION;
+import static com.aldo.apps.familyhelpers.utils.GlobalConstants.SLEEP_TIMER_CHANNEL_ID;
+import static com.aldo.apps.familyhelpers.utils.GlobalConstants.SLEEP_TIMER_DURATION_MILLIS_EXTRA;
+import static com.aldo.apps.familyhelpers.utils.GlobalConstants.SLEEP_TIMER_NOTIFICATION_ID;
+
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.Intent;
+import android.os.Build;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.Looper;
+import android.util.Log;
+
+import androidx.annotation.Nullable;
+import androidx.core.app.NotificationCompat;
+
+import com.aldo.apps.familyhelpers.HelperGridActivity;
+import com.aldo.apps.familyhelpers.R;
+import com.aldo.apps.familyhelpers.utils.DevicePolicyManagerHelper;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Service implementation to post a notification and execute the locking of the screen after the
+ * #timeout ended.
+ */
+public class SleepTimerHelper extends Service {
+
+    /**
+     * Tag for debugging purpose.
+     */
+    private static final String TAG = "SleepTimerHelper";
+    /**
+     * {@link Handler} on the MainThread in order to perform the actual locking.
+     */
+    private final Handler mHandler = new Handler(Looper.getMainLooper());
+    /**
+     * Member holding the remaining time of the countdown.
+     */
+    private long mCountdownTimeMillis;
+    /**
+     * The {@link Runnable} to execute the task in.
+     */
+    private Runnable mCountdownRunnable;
+
+    /**
+     * The {@link DevicePolicyManagerHelper} to actually lock the screen.
+     */
+    private DevicePolicyManagerHelper mDevicePolicyHelper;
+
+    /**
+     * {@link NotificationManager} to show and update the foreground service notification.
+     */
+    private NotificationManager mNotificationManager;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Log.d(TAG, "onCreate() called");
+        mDevicePolicyHelper = DevicePolicyManagerHelper.getInstance(this);
+        mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        if (intent == null) {
+            Log.e(TAG, "onStartCommand: Invalid intent intent received, do nothing");
+            return START_REDELIVER_INTENT;
+        }
+        if (intent.getAction() != null && intent.getAction().equals(SLEEP_TIMER_CANCEL_ACTION)) {
+            stopSelf();
+            return START_NOT_STICKY;
+        }
+        mCountdownTimeMillis = intent.getLongExtra(SLEEP_TIMER_DURATION_MILLIS_EXTRA, 0);
+        createNotificationChannel();
+        startForeground(SLEEP_TIMER_NOTIFICATION_ID, buildNotification());
+        mNotificationManager.notify(SLEEP_TIMER_NOTIFICATION_ID, buildNotification());
+        startCountdown();
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        return null;
+    }
+
+    /**
+     * Helper method to prepare the actual runner to countdown, will finally lock the screen if the
+     * countdown expired.
+     */
+    private void startCountdown() {
+        mCountdownRunnable = new Runnable() {
+            @Override
+            public void run() {
+                if (mCountdownTimeMillis > 0) {
+                    updateNotification();
+                    mCountdownTimeMillis -= ONE_SECOND_IN_MILLIS;
+                    mHandler.postDelayed(this, ONE_SECOND_IN_MILLIS);
+                } else {
+                    mDevicePolicyHelper.lockScreen();
+                    Log.d(TAG, "run: Countdown expired, lock screen");
+                    stopSelf();
+                }
+            }
+        };
+        mHandler.post(mCountdownRunnable);
+    }
+
+    /**
+     * Helper method to update the notification with the new time.
+     */
+    private void updateNotification() {
+        final Notification notification = buildNotification();
+        mNotificationManager.notify(SLEEP_TIMER_NOTIFICATION_ID, notification);
+    }
+
+    /**
+     * Helper method to build the Notification to be shown showing the current progress of the countdown.#
+     *
+     * @return The built notification.
+     */
+    private Notification buildNotification() {
+        final String countdownText = formatTime(mCountdownTimeMillis);
+        final Intent notificationIntent = new Intent(this, HelperGridActivity.class);
+        final PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
+                notificationIntent, PendingIntent.FLAG_IMMUTABLE);
+
+        final Intent cancelIntent = new Intent(this, SleepTimerHelper.class);
+        cancelIntent.setAction(SLEEP_TIMER_CANCEL_ACTION);
+        final PendingIntent cancelPendingIntent = PendingIntent.getService(this, 0,
+                cancelIntent, PendingIntent.FLAG_IMMUTABLE);
+
+        return new NotificationCompat.Builder(this, SLEEP_TIMER_CHANNEL_ID)
+                .setContentTitle(getString(R.string.title_sleep_timer))
+                .setContentText(String.format(getString(R.string.sleep_timer_notification_content),
+                        countdownText))
+                .setSmallIcon(android.R.drawable.ic_lock_idle_alarm)
+                .setContentIntent(pendingIntent)
+                .addAction(android.R.drawable.ic_menu_close_clear_cancel,
+                        getString(R.string.sleep_timer_notification_cancel), cancelPendingIntent)
+                .build();
+    }
+
+    /**
+     * Creates ad registers a new {@link NotificationChannel}.
+     */
+    private void createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            final NotificationChannel channel = new NotificationChannel(SLEEP_TIMER_CHANNEL_ID,
+                    getString(R.string.sleep_timer_notification_channel),
+                    NotificationManager.IMPORTANCE_DEFAULT);
+            mNotificationManager.createNotificationChannel(channel);
+        }
+    }
+
+    /**
+     * Formats the provided time in milliseconds in a human readable format.
+     *
+     * @param millis The remaining time in milliseconds.
+     *
+     * @return The String representation of the milliseconds.
+     */
+    private String formatTime(long millis) {
+        long minutes = TimeUnit.MILLISECONDS.toMinutes(millis);
+        long seconds = TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(minutes);
+        if (minutes > ONE_HOUR_IN_MINUTES) {
+            final long hours = minutes / ONE_HOUR_IN_MINUTES;
+            final long minutesCleaned = minutes % ONE_HOUR_IN_MINUTES;
+            return String.format(getString(R.string.sleep_timer_remaining_time_with_hour),
+                    hours, minutesCleaned, seconds);
+        }
+        return String.format(getString(R.string.sleep_timer_remaining_time_without_hour), minutes, seconds);
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        mHandler.removeCallbacks(mCountdownRunnable);
+    }
+}

app/src/main/res/drawable/helper_group_tile_background.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true">
+        <shape>
+            <solid android:color="@color/md_theme_inverseOnSurface_highContrast" />
+
+            <stroke
+                android:width="3dp"
+                android:color="@color/md_theme_outline_highContrast" />
+
+            <padding
+                android:bottom="1dp"
+                android:left="1dp"
+                android:right="1dp"
+                android:top="1dp" />
+
+            <corners
+                android:bottomLeftRadius="7dp"
+                android:bottomRightRadius="7dp"
+                android:topLeftRadius="7dp"
+                android:topRightRadius="7dp" />
+        </shape>
+    </item>
+    <item android:state_pressed="false">
+        <shape>
+            <solid android:color="@color/md_theme_inverseOnSurface_mediumContrast" />
+
+            <stroke
+                android:width="3dp"
+                android:color="@color/md_theme_outline_mediumContrast" />
+
+            <padding
+                android:bottom="1dp"
+                android:left="1dp"
+                android:right="1dp"
+                android:top="1dp" />
+
+            <corners
+                android:bottomLeftRadius="7dp"
+                android:bottomRightRadius="7dp"
+                android:topLeftRadius="7dp"
+                android:topRightRadius="7dp" />
+        </shape>
+    </item>
+</selector>

app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/src/main/res/drawable/icn_sleep_timer.xml

@@ -0,0 +1,10 @@
+<vector android:height="200dp" android:viewportHeight="1024"
+    android:viewportWidth="1024" android:width="200dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#5FCEFF" android:pathData="M366.3,744.8h524.5l-21.2,-303.6c-0,0 -401.1,-0.1 -503.2,303.6z"/>
+    <path android:fillColor="#8B87C1" android:pathData="M943.3,744.8v159.8h-863.2v-159.8h800.1z"/>
+    <path android:fillColor="#FFB578" android:pathData="M240.8,499.8c57,0 103.2,46.2 103.2,103.1s-46.2,103.2 -103.2,103.2 -103.1,-46.2 -103.1,-103.2 46.2,-103.1 103.1,-103.1z"/>
+    <path android:fillColor="#4F46A3" android:pathData="M80.1,986.7a22.4,22.4 0,0 1,-22.4 -22.4v-529.2a22.4,22.4 0,1 1,44.8 0v529.2a22.4,22.4 0,0 1,-22.4 22.4zM943.3,986.7a22.4,22.4 0,0 1,-22.4 -22.4v-305.4a22.4,22.4 0,1 1,44.8 0v305.4c0,12.4 -10,22.4 -22.4,22.4z"/>
+    <path android:fillColor="#4F46A3" android:pathData="M943.3,767.1h-863.2a22.4,22.4 0,1 1,0 -44.8h863.2a22.4,22.4 0,1 1,0 44.8z"/>
+    <path android:fillColor="#4F46A3" android:pathData="M240.8,728.5c-69.2,0 -125.5,-56.3 -125.5,-125.5 0,-69.2 56.3,-125.5 125.5,-125.5 69.2,0 125.5,56.3 125.5,125.5 0,69.2 -56.3,125.5 -125.5,125.5zM240.8,522.2c-44.5,0 -80.8,36.2 -80.8,80.8 0,44.5 36.2,80.8 80.8,80.8 44.5,0 80.8,-36.2 80.8,-80.8 0,-44.5 -36.2,-80.8 -80.8,-80.8zM371.9,766.8a22.4,22.4 0,0 1,-22.4 -22.4c0,-82.6 58.1,-166.2 159.4,-229.4 102.4,-63.8 234.2,-99 371.3,-99a22.4,22.4 0,1 1,0 44.8c-128.8,0 -252.2,32.7 -347.6,92.2 -87.9,54.8 -138.3,124.6 -138.3,191.4a22.4,22.4 0,0 1,-22.4 22.4z"/>
+    <path android:fillColor="#4F46A3" android:pathData="M880.2,767.1a22.4,22.4 0,0 1,-22.4 -22.4v-306.4a22.4,22.4 0,1 1,44.8 0v306.4a22.4,22.4 0,0 1,-22.4 22.4zM477.7,429.5h-167.8a22.4,22.4 0,0 1,-12.3 -41.1l105.6,-69.6H309.8a22.4,22.4 0,1 1,0 -44.8h167.8a22.4,22.4 0,0 1,12.3 41.1l-105.6,69.6h93.2a22.4,22.4 0,1 1,0 44.8zM636.6,205.7h-103a22.4,22.4 0,0 1,-12.3 -41.1l40.7,-26.8h-28.4a22.4,22.4 0,1 1,0 -44.8h103a22.4,22.4 0,0 1,12.3 41.1l-40.7,26.8h28.4a22.4,22.4 0,1 1,0 44.8zM868.4,136.5h-87a22.4,22.4 0,0 1,-12.3 -41.1l24.7,-16.3h-12.4a22.4,22.4 0,1 1,0 -44.8h87a22.4,22.4 0,0 1,12.3 41.1l-24.7,16.3h12.4a22.4,22.4 0,1 1,0 44.8zM943.3,927h-863.2a22.4,22.4 0,1 1,0 -44.8h863.2a22.4,22.4 0,1 1,0 44.8z"/>
+</vector>

app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".HelperGridActivity">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:weightSum="2">
+
+        <include layout="@layout/helper_group_tile_item"
+            android:id="@+id/tile_sleep_timer"
+            android:layout_margin="10dp"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"/>
+
+    </LinearLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/helper_group_tile_item.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/helper_group_tile"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:maxHeight="150dp"
+    android:maxWidth="250dp"
+    android:padding="15dp"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:background="@drawable/helper_group_tile_background">
+
+    <ImageView
+        android:id="@+id/iv_helper_group_icon"
+        android:layout_width="75dp"
+        android:layout_height="75dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        tools:src="@drawable/icn_sleep_timer"/>
+
+    <TextView
+        android:id="@+id/tv_helper_group_title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintTop_toBottomOf="@id/iv_helper_group_icon"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        tools:text="Sleep Timer"
+        android:textStyle="bold"
+        android:maxLines="1"
+        android:textColor="@color/md_theme_onBackground_highContrast"
+        />
+
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/mipmap-anydpi/ic_launcher.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/mipmap-anydpi/ic_launcher_round.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

app/src/main/res/values-night/colors.xml

@@ -0,0 +1,144 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="md_theme_primary">#91D5AC</color>
+    <color name="md_theme_onPrimary">#003921</color>
+    <color name="md_theme_primaryContainer">#055232</color>
+    <color name="md_theme_onPrimaryContainer">#ADF2C7</color>
+    <color name="md_theme_secondary">#B5CCBB</color>
+    <color name="md_theme_onSecondary">#213528</color>
+    <color name="md_theme_secondaryContainer">#374B3E</color>
+    <color name="md_theme_onSecondaryContainer">#D0E8D6</color>
+    <color name="md_theme_tertiary">#A4CDDC</color>
+    <color name="md_theme_onTertiary">#043541</color>
+    <color name="md_theme_tertiaryContainer">#224C59</color>
+    <color name="md_theme_onTertiaryContainer">#BFE9F9</color>
+    <color name="md_theme_error">#FFB4AB</color>
+    <color name="md_theme_onError">#690005</color>
+    <color name="md_theme_errorContainer">#93000A</color>
+    <color name="md_theme_onErrorContainer">#FFDAD6</color>
+    <color name="md_theme_background">#0F1511</color>
+    <color name="md_theme_onBackground">#DFE4DD</color>
+    <color name="md_theme_surface">#0F1511</color>
+    <color name="md_theme_onSurface">#DFE4DD</color>
+    <color name="md_theme_surfaceVariant">#404942</color>
+    <color name="md_theme_onSurfaceVariant">#C0C9C0</color>
+    <color name="md_theme_outline">#8A938B</color>
+    <color name="md_theme_outlineVariant">#404942</color>
+    <color name="md_theme_scrim">#000000</color>
+    <color name="md_theme_inverseSurface">#DFE4DD</color>
+    <color name="md_theme_inverseOnSurface">#2C322D</color>
+    <color name="md_theme_inversePrimary">#276A49</color>
+    <color name="md_theme_primaryFixed">#ADF2C7</color>
+    <color name="md_theme_onPrimaryFixed">#002111</color>
+    <color name="md_theme_primaryFixedDim">#91D5AC</color>
+    <color name="md_theme_onPrimaryFixedVariant">#055232</color>
+    <color name="md_theme_secondaryFixed">#D0E8D6</color>
+    <color name="md_theme_onSecondaryFixed">#0B1F14</color>
+    <color name="md_theme_secondaryFixedDim">#B5CCBB</color>
+    <color name="md_theme_onSecondaryFixedVariant">#374B3E</color>
+    <color name="md_theme_tertiaryFixed">#BFE9F9</color>
+    <color name="md_theme_onTertiaryFixed">#001F27</color>
+    <color name="md_theme_tertiaryFixedDim">#A4CDDC</color>
+    <color name="md_theme_onTertiaryFixedVariant">#224C59</color>
+    <color name="md_theme_surfaceDim">#0F1511</color>
+    <color name="md_theme_surfaceBright">#353B36</color>
+    <color name="md_theme_surfaceContainerLowest">#0A0F0C</color>
+    <color name="md_theme_surfaceContainerLow">#171D19</color>
+    <color name="md_theme_surfaceContainer">#1B211D</color>
+    <color name="md_theme_surfaceContainerHigh">#262B27</color>
+    <color name="md_theme_surfaceContainerHighest">#303632</color>
+    <color name="md_theme_primary_mediumContrast">#96D9B0</color>
+    <color name="md_theme_onPrimary_mediumContrast">#001B0D</color>
+    <color name="md_theme_primaryContainer_mediumContrast">#5C9E79</color>
+    <color name="md_theme_onPrimaryContainer_mediumContrast">#000000</color>
+    <color name="md_theme_secondary_mediumContrast">#B9D1BF</color>
+    <color name="md_theme_onSecondary_mediumContrast">#061A0F</color>
+    <color name="md_theme_secondaryContainer_mediumContrast">#809686</color>
+    <color name="md_theme_onSecondaryContainer_mediumContrast">#000000</color>
+    <color name="md_theme_tertiary_mediumContrast">#A8D1E0</color>
+    <color name="md_theme_onTertiary_mediumContrast">#001921</color>
+    <color name="md_theme_tertiaryContainer_mediumContrast">#6E97A5</color>
+    <color name="md_theme_onTertiaryContainer_mediumContrast">#000000</color>
+    <color name="md_theme_error_mediumContrast">#FFBAB1</color>
+    <color name="md_theme_onError_mediumContrast">#370001</color>
+    <color name="md_theme_errorContainer_mediumContrast">#FF5449</color>
+    <color name="md_theme_onErrorContainer_mediumContrast">#000000</color>
+    <color name="md_theme_background_mediumContrast">#0F1511</color>
+    <color name="md_theme_onBackground_mediumContrast">#DFE4DD</color>
+    <color name="md_theme_surface_mediumContrast">#0F1511</color>
+    <color name="md_theme_onSurface_mediumContrast">#F7FCF5</color>
+    <color name="md_theme_surfaceVariant_mediumContrast">#404942</color>
+    <color name="md_theme_onSurfaceVariant_mediumContrast">#C4CDC4</color>
+    <color name="md_theme_outline_mediumContrast">#9CA59D</color>
+    <color name="md_theme_outlineVariant_mediumContrast">#7D857E</color>
+    <color name="md_theme_scrim_mediumContrast">#000000</color>
+    <color name="md_theme_inverseSurface_mediumContrast">#DFE4DD</color>
+    <color name="md_theme_inverseOnSurface_mediumContrast">#262B27</color>
+    <color name="md_theme_inversePrimary_mediumContrast">#075333</color>
+    <color name="md_theme_primaryFixed_mediumContrast">#ADF2C7</color>
+    <color name="md_theme_onPrimaryFixed_mediumContrast">#001509</color>
+    <color name="md_theme_primaryFixedDim_mediumContrast">#91D5AC</color>
+    <color name="md_theme_onPrimaryFixedVariant_mediumContrast">#003F25</color>
+    <color name="md_theme_secondaryFixed_mediumContrast">#D0E8D6</color>
+    <color name="md_theme_onSecondaryFixed_mediumContrast">#02150A</color>
+    <color name="md_theme_secondaryFixedDim_mediumContrast">#B5CCBB</color>
+    <color name="md_theme_onSecondaryFixedVariant_mediumContrast">#263B2E</color>
+    <color name="md_theme_tertiaryFixed_mediumContrast">#BFE9F9</color>
+    <color name="md_theme_onTertiaryFixed_mediumContrast">#00141A</color>
+    <color name="md_theme_tertiaryFixedDim_mediumContrast">#A4CDDC</color>
+    <color name="md_theme_onTertiaryFixedVariant_mediumContrast">#0D3B47</color>
+    <color name="md_theme_surfaceDim_mediumContrast">#0F1511</color>
+    <color name="md_theme_surfaceBright_mediumContrast">#353B36</color>
+    <color name="md_theme_surfaceContainerLowest_mediumContrast">#0A0F0C</color>
+    <color name="md_theme_surfaceContainerLow_mediumContrast">#171D19</color>
+    <color name="md_theme_surfaceContainer_mediumContrast">#1B211D</color>
+    <color name="md_theme_surfaceContainerHigh_mediumContrast">#262B27</color>
+    <color name="md_theme_surfaceContainerHighest_mediumContrast">#303632</color>
+    <color name="md_theme_primary_highContrast">#EEFFF1</color>
+    <color name="md_theme_onPrimary_highContrast">#000000</color>
+    <color name="md_theme_primaryContainer_highContrast">#96D9B0</color>
+    <color name="md_theme_onPrimaryContainer_highContrast">#000000</color>
+    <color name="md_theme_secondary_highContrast">#EEFFF1</color>
+    <color name="md_theme_onSecondary_highContrast">#000000</color>
+    <color name="md_theme_secondaryContainer_highContrast">#B9D1BF</color>
+    <color name="md_theme_onSecondaryContainer_highContrast">#000000</color>
+    <color name="md_theme_tertiary_highContrast">#F5FCFF</color>
+    <color name="md_theme_onTertiary_highContrast">#000000</color>
+    <color name="md_theme_tertiaryContainer_highContrast">#A8D1E0</color>
+    <color name="md_theme_onTertiaryContainer_highContrast">#000000</color>
+    <color name="md_theme_error_highContrast">#FFF9F9</color>
+    <color name="md_theme_onError_highContrast">#000000</color>
+    <color name="md_theme_errorContainer_highContrast">#FFBAB1</color>
+    <color name="md_theme_onErrorContainer_highContrast">#000000</color>
+    <color name="md_theme_background_highContrast">#0F1511</color>
+    <color name="md_theme_onBackground_highContrast">#DFE4DD</color>
+    <color name="md_theme_surface_highContrast">#0F1511</color>
+    <color name="md_theme_onSurface_highContrast">#FFFFFF</color>
+    <color name="md_theme_surfaceVariant_highContrast">#404942</color>
+    <color name="md_theme_onSurfaceVariant_highContrast">#F4FDF4</color>
+    <color name="md_theme_outline_highContrast">#C4CDC4</color>
+    <color name="md_theme_outlineVariant_highContrast">#C4CDC4</color>
+    <color name="md_theme_scrim_highContrast">#000000</color>
+    <color name="md_theme_inverseSurface_highContrast">#DFE4DD</color>
+    <color name="md_theme_inverseOnSurface_highContrast">#000000</color>
+    <color name="md_theme_inversePrimary_highContrast">#00311C</color>
+    <color name="md_theme_primaryFixed_highContrast">#B1F6CB</color>
+    <color name="md_theme_onPrimaryFixed_highContrast">#000000</color>
+    <color name="md_theme_primaryFixedDim_highContrast">#96D9B0</color>
+    <color name="md_theme_onPrimaryFixedVariant_highContrast">#001B0D</color>
+    <color name="md_theme_secondaryFixed_highContrast">#D5EDDB</color>
+    <color name="md_theme_onSecondaryFixed_highContrast">#000000</color>
+    <color name="md_theme_secondaryFixedDim_highContrast">#B9D1BF</color>
+    <color name="md_theme_onSecondaryFixedVariant_highContrast">#061A0F</color>
+    <color name="md_theme_tertiaryFixed_highContrast">#C3EEFD</color>
+    <color name="md_theme_onTertiaryFixed_highContrast">#000000</color>
+    <color name="md_theme_tertiaryFixedDim_highContrast">#A8D1E0</color>
+    <color name="md_theme_onTertiaryFixedVariant_highContrast">#001921</color>
+    <color name="md_theme_surfaceDim_highContrast">#0F1511</color>
+    <color name="md_theme_surfaceBright_highContrast">#353B36</color>
+    <color name="md_theme_surfaceContainerLowest_highContrast">#0A0F0C</color>
+    <color name="md_theme_surfaceContainerLow_highContrast">#171D19</color>
+    <color name="md_theme_surfaceContainer_highContrast">#1B211D</color>
+    <color name="md_theme_surfaceContainerHigh_highContrast">#262B27</color>
+    <color name="md_theme_surfaceContainerHighest_highContrast">#303632</color>
+</resources>

app/src/main/res/values-night/styles.xml

@@ -0,0 +1,6 @@
+<resources>
+    <style name="Widget.Theme.MyApplication.MyView" parent="">
+        <item name="android:background">@color/gray_600</item>
+        <item name="exampleColor">@color/light_blue_600</item>
+    </style>
+</resources>

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,55 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Base.Theme.MyApplication" parent="Theme.Material3.DayNight.NoActionBar">
+        <item name="colorPrimary">@color/md_theme_primary</item>
+        <item name="colorOnPrimary">@color/md_theme_onPrimary</item>
+        <item name="colorPrimaryContainer">@color/md_theme_primaryContainer</item>
+        <item name="colorOnPrimaryContainer">@color/md_theme_onPrimaryContainer</item>
+        <item name="colorSecondary">@color/md_theme_secondary</item>
+        <item name="colorOnSecondary">@color/md_theme_onSecondary</item>
+        <item name="colorSecondaryContainer">@color/md_theme_secondaryContainer</item>
+        <item name="colorOnSecondaryContainer">@color/md_theme_onSecondaryContainer</item>
+        <item name="colorTertiary">@color/md_theme_tertiary</item>
+        <item name="colorOnTertiary">@color/md_theme_onTertiary</item>
+        <item name="colorTertiaryContainer">@color/md_theme_tertiaryContainer</item>
+        <item name="colorOnTertiaryContainer">@color/md_theme_onTertiaryContainer</item>
+        <item name="colorError">@color/md_theme_error</item>
+        <item name="colorOnError">@color/md_theme_onError</item>
+        <item name="colorErrorContainer">@color/md_theme_errorContainer</item>
+        <item name="colorOnErrorContainer">@color/md_theme_onErrorContainer</item>
+        <item name="android:colorBackground">@color/md_theme_background</item>
+        <item name="colorOnBackground">@color/md_theme_onBackground</item>
+        <item name="colorSurface">@color/md_theme_surface</item>
+        <item name="colorOnSurface">@color/md_theme_onSurface</item>
+        <item name="colorSurfaceVariant">@color/md_theme_surfaceVariant</item>
+        <item name="colorOnSurfaceVariant">@color/md_theme_onSurfaceVariant</item>
+        <item name="colorOutline">@color/md_theme_outline</item>
+        <item name="colorOutlineVariant">@color/md_theme_outlineVariant</item>
+        <item name="colorSurfaceInverse">@color/md_theme_inverseSurface</item>
+        <item name="colorOnSurfaceInverse">@color/md_theme_inverseOnSurface</item>
+        <item name="colorPrimaryInverse">@color/md_theme_inversePrimary</item>
+        <item name="colorPrimaryFixed">@color/md_theme_primaryFixed</item>
+        <item name="colorOnPrimaryFixed">@color/md_theme_onPrimaryFixed</item>
+        <item name="colorPrimaryFixedDim">@color/md_theme_primaryFixedDim</item>
+        <item name="colorOnPrimaryFixedVariant">@color/md_theme_onPrimaryFixedVariant</item>
+        <item name="colorSecondaryFixed">@color/md_theme_secondaryFixed</item>
+        <item name="colorOnSecondaryFixed">@color/md_theme_onSecondaryFixed</item>
+        <item name="colorSecondaryFixedDim">@color/md_theme_secondaryFixedDim</item>
+        <item name="colorOnSecondaryFixedVariant">@color/md_theme_onSecondaryFixedVariant</item>
+        <item name="colorTertiaryFixed">@color/md_theme_tertiaryFixed</item>
+        <item name="colorOnTertiaryFixed">@color/md_theme_onTertiaryFixed</item>
+        <item name="colorTertiaryFixedDim">@color/md_theme_tertiaryFixedDim</item>
+        <item name="colorOnTertiaryFixedVariant">@color/md_theme_onTertiaryFixedVariant</item>
+        <item name="colorSurfaceDim">@color/md_theme_surfaceDim</item>
+        <item name="colorSurfaceBright">@color/md_theme_surfaceBright</item>
+        <item name="colorSurfaceContainerLowest">@color/md_theme_surfaceContainerLowest</item>
+        <item name="colorSurfaceContainerLow">@color/md_theme_surfaceContainerLow</item>
+        <item name="colorSurfaceContainer">@color/md_theme_surfaceContainer</item>
+        <item name="colorSurfaceContainerHigh">@color/md_theme_surfaceContainerHigh</item>
+        <item name="colorSurfaceContainerHighest">@color/md_theme_surfaceContainerHighest</item>
+    </style>
+
+    <style name="HelperGroupTileStyke" parent="Theme.Material3.DayNight.NoActionBar">
+        <item name="colorPrimary">@color/helperGroupTileBackground_NightMode</item>
+    </style>
+</resources>

app/src/main/res/values/attrs_helper_group_button.xml

@@ -0,0 +1,8 @@
+<resources>
+    <declare-styleable name="HelperGroupButton">
+        <attr name="exampleString" format="string" />
+        <attr name="exampleDimension" format="dimension" />
+        <attr name="exampleColor" format="color" />
+        <attr name="exampleDrawable" format="color|reference" />
+    </declare-styleable>
+</resources>

app/src/main/res/values/colors.xml

@@ -0,0 +1,155 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+
+    <color name="helperGroupTileBackground_LightMode">#DADADA</color>
+    <color name="helperGroupTileBorder_LightMode">#00796B</color>
+    <color name="helperGroupTileBackground_NightMode">#DADADA</color>
+    <color name="helperGroupTileBorder_NightMode">#00796B</color>
+    <color name="light_blue_400">#FF29B6F6</color>
+    <color name="light_blue_600">#FF039BE5</color>
+    <color name="gray_400">#FFBDBDBD</color>
+    <color name="gray_600">#FF757575</color>
+
+    <!-- Auto-Generated Colors -->
+    <color name="md_theme_primary">#276A49</color>
+    <color name="md_theme_onPrimary">#FFFFFF</color>
+    <color name="md_theme_primaryContainer">#ADF2C7</color>
+    <color name="md_theme_onPrimaryContainer">#002111</color>
+    <color name="md_theme_secondary">#4E6355</color>
+    <color name="md_theme_onSecondary">#FFFFFF</color>
+    <color name="md_theme_secondaryContainer">#D0E8D6</color>
+    <color name="md_theme_onSecondaryContainer">#0B1F14</color>
+    <color name="md_theme_tertiary">#3C6471</color>
+    <color name="md_theme_onTertiary">#FFFFFF</color>
+    <color name="md_theme_tertiaryContainer">#BFE9F9</color>
+    <color name="md_theme_onTertiaryContainer">#001F27</color>
+    <color name="md_theme_error">#BA1A1A</color>
+    <color name="md_theme_onError">#FFFFFF</color>
+    <color name="md_theme_errorContainer">#FFDAD6</color>
+    <color name="md_theme_onErrorContainer">#410002</color>
+    <color name="md_theme_background">#F6FBF4</color>
+    <color name="md_theme_onBackground">#171D19</color>
+    <color name="md_theme_surface">#F6FBF4</color>
+    <color name="md_theme_onSurface">#171D19</color>
+    <color name="md_theme_surfaceVariant">#DCE5DC</color>
+    <color name="md_theme_onSurfaceVariant">#404942</color>
+    <color name="md_theme_outline">#717972</color>
+    <color name="md_theme_outlineVariant">#C0C9C0</color>
+    <color name="md_theme_scrim">#000000</color>
+    <color name="md_theme_inverseSurface">#2C322D</color>
+    <color name="md_theme_inverseOnSurface">#EDF2EB</color>
+    <color name="md_theme_inversePrimary">#91D5AC</color>
+    <color name="md_theme_primaryFixed">#ADF2C7</color>
+    <color name="md_theme_onPrimaryFixed">#002111</color>
+    <color name="md_theme_primaryFixedDim">#91D5AC</color>
+    <color name="md_theme_onPrimaryFixedVariant">#055232</color>
+    <color name="md_theme_secondaryFixed">#D0E8D6</color>
+    <color name="md_theme_onSecondaryFixed">#0B1F14</color>
+    <color name="md_theme_secondaryFixedDim">#B5CCBB</color>
+    <color name="md_theme_onSecondaryFixedVariant">#374B3E</color>
+    <color name="md_theme_tertiaryFixed">#BFE9F9</color>
+    <color name="md_theme_onTertiaryFixed">#001F27</color>
+    <color name="md_theme_tertiaryFixedDim">#A4CDDC</color>
+    <color name="md_theme_onTertiaryFixedVariant">#224C59</color>
+    <color name="md_theme_surfaceDim">#D6DBD5</color>
+    <color name="md_theme_surfaceBright">#F6FBF4</color>
+    <color name="md_theme_surfaceContainerLowest">#FFFFFF</color>
+    <color name="md_theme_surfaceContainerLow">#F0F5EE</color>
+    <color name="md_theme_surfaceContainer">#EAEFE9</color>
+    <color name="md_theme_surfaceContainerHigh">#E4EAE3</color>
+    <color name="md_theme_surfaceContainerHighest">#DFE4DD</color>
+    <color name="md_theme_primary_mediumContrast">#004D2F</color>
+    <color name="md_theme_onPrimary_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_primaryContainer_mediumContrast">#40815E</color>
+    <color name="md_theme_onPrimaryContainer_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_secondary_mediumContrast">#33473A</color>
+    <color name="md_theme_onSecondary_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_secondaryContainer_mediumContrast">#647A6B</color>
+    <color name="md_theme_onSecondaryContainer_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_tertiary_mediumContrast">#1E4855</color>
+    <color name="md_theme_onTertiary_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_tertiaryContainer_mediumContrast">#527A88</color>
+    <color name="md_theme_onTertiaryContainer_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_error_mediumContrast">#8C0009</color>
+    <color name="md_theme_onError_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_errorContainer_mediumContrast">#DA342E</color>
+    <color name="md_theme_onErrorContainer_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_background_mediumContrast">#F6FBF4</color>
+    <color name="md_theme_onBackground_mediumContrast">#171D19</color>
+    <color name="md_theme_surface_mediumContrast">#F6FBF4</color>
+    <color name="md_theme_onSurface_mediumContrast">#171D19</color>
+    <color name="md_theme_surfaceVariant_mediumContrast">#DCE5DC</color>
+    <color name="md_theme_onSurfaceVariant_mediumContrast">#3C453F</color>
+    <color name="md_theme_outline_mediumContrast">#59615A</color>
+    <color name="md_theme_outlineVariant_mediumContrast">#747D76</color>
+    <color name="md_theme_scrim_mediumContrast">#000000</color>
+    <color name="md_theme_inverseSurface_mediumContrast">#2C322D</color>
+    <color name="md_theme_inverseOnSurface_mediumContrast">#EDF2EB</color>
+    <color name="md_theme_inversePrimary_mediumContrast">#91D5AC</color>
+    <color name="md_theme_primaryFixed_mediumContrast">#40815E</color>
+    <color name="md_theme_onPrimaryFixed_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_primaryFixedDim_mediumContrast">#256846</color>
+    <color name="md_theme_onPrimaryFixedVariant_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_secondaryFixed_mediumContrast">#647A6B</color>
+    <color name="md_theme_onSecondaryFixed_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_secondaryFixedDim_mediumContrast">#4C6153</color>
+    <color name="md_theme_onSecondaryFixedVariant_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_tertiaryFixed_mediumContrast">#527A88</color>
+    <color name="md_theme_onTertiaryFixed_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_tertiaryFixedDim_mediumContrast">#39626F</color>
+    <color name="md_theme_onTertiaryFixedVariant_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_surfaceDim_mediumContrast">#D6DBD5</color>
+    <color name="md_theme_surfaceBright_mediumContrast">#F6FBF4</color>
+    <color name="md_theme_surfaceContainerLowest_mediumContrast">#FFFFFF</color>
+    <color name="md_theme_surfaceContainerLow_mediumContrast">#F0F5EE</color>
+    <color name="md_theme_surfaceContainer_mediumContrast">#EAEFE9</color>
+    <color name="md_theme_surfaceContainerHigh_mediumContrast">#E4EAE3</color>
+    <color name="md_theme_surfaceContainerHighest_mediumContrast">#DFE4DD</color>
+    <color name="md_theme_primary_highContrast">#002816</color>
+    <color name="md_theme_onPrimary_highContrast">#FFFFFF</color>
+    <color name="md_theme_primaryContainer_highContrast">#004D2F</color>
+    <color name="md_theme_onPrimaryContainer_highContrast">#FFFFFF</color>
+    <color name="md_theme_secondary_highContrast">#12261B</color>
+    <color name="md_theme_onSecondary_highContrast">#FFFFFF</color>
+    <color name="md_theme_secondaryContainer_highContrast">#33473A</color>
+    <color name="md_theme_onSecondaryContainer_highContrast">#FFFFFF</color>
+    <color name="md_theme_tertiary_highContrast">#002630</color>
+    <color name="md_theme_onTertiary_highContrast">#FFFFFF</color>
+    <color name="md_theme_tertiaryContainer_highContrast">#1E4855</color>
+    <color name="md_theme_onTertiaryContainer_highContrast">#FFFFFF</color>
+    <color name="md_theme_error_highContrast">#4E0002</color>
+    <color name="md_theme_onError_highContrast">#FFFFFF</color>
+    <color name="md_theme_errorContainer_highContrast">#8C0009</color>
+    <color name="md_theme_onErrorContainer_highContrast">#FFFFFF</color>
+    <color name="md_theme_background_highContrast">#F6FBF4</color>
+    <color name="md_theme_onBackground_highContrast">#171D19</color>
+    <color name="md_theme_surface_highContrast">#F6FBF4</color>
+    <color name="md_theme_onSurface_highContrast">#000000</color>
+    <color name="md_theme_surfaceVariant_highContrast">#DCE5DC</color>
+    <color name="md_theme_onSurfaceVariant_highContrast">#1E2620</color>
+    <color name="md_theme_outline_highContrast">#3C453F</color>
+    <color name="md_theme_outlineVariant_highContrast">#3C453F</color>
+    <color name="md_theme_scrim_highContrast">#000000</color>
+    <color name="md_theme_inverseSurface_highContrast">#2C322D</color>
+    <color name="md_theme_inverseOnSurface_highContrast">#FFFFFF</color>
+    <color name="md_theme_inversePrimary_highContrast">#B6FBD0</color>
+    <color name="md_theme_primaryFixed_highContrast">#004D2F</color>
+    <color name="md_theme_onPrimaryFixed_highContrast">#FFFFFF</color>
+    <color name="md_theme_primaryFixedDim_highContrast">#00341E</color>
+    <color name="md_theme_onPrimaryFixedVariant_highContrast">#FFFFFF</color>
+    <color name="md_theme_secondaryFixed_highContrast">#33473A</color>
+    <color name="md_theme_onSecondaryFixed_highContrast">#FFFFFF</color>
+    <color name="md_theme_secondaryFixedDim_highContrast">#1D3125</color>
+    <color name="md_theme_onSecondaryFixedVariant_highContrast">#FFFFFF</color>
+    <color name="md_theme_tertiaryFixed_highContrast">#1E4855</color>
+    <color name="md_theme_onTertiaryFixed_highContrast">#FFFFFF</color>
+    <color name="md_theme_tertiaryFixedDim_highContrast">#00323D</color>
+    <color name="md_theme_onTertiaryFixedVariant_highContrast">#FFFFFF</color>
+    <color name="md_theme_surfaceDim_highContrast">#D6DBD5</color>
+    <color name="md_theme_surfaceBright_highContrast">#F6FBF4</color>
+    <color name="md_theme_surfaceContainerLowest_highContrast">#FFFFFF</color>
+    <color name="md_theme_surfaceContainerLow_highContrast">#F0F5EE</color>
+    <color name="md_theme_surfaceContainer_highContrast">#EAEFE9</color>
+</resources>

app/src/main/res/values/strings.xml

@@ -0,0 +1,16 @@
+<resources>
+    <string name="app_name">Doerflinger-Helpers</string>
+
+    <string name="warning_no_device_admin">The action you would like to perform requires DeviceAdmin privileges, please grant them before continuing.</string>
+
+    <!-- Sleep Timer Functionality Strings -->
+    <string name="title_sleep_timer">Sleep Timer</string>
+    <string name="sleep_timer_notification_channel">SleepTimer</string>
+    <string name="description_sleep_timer">Offers the possibility top set a sleep timer, after which the display will turn off</string>
+    <string name="sleep_timer_rationale_device_admin">Device Admin privileges are needed for locking the screen after a specified timeout</string>
+    <string name="sleep_timer_show_notifications_rationale">In order for this feature to work, the app must be allowed to show a Notification</string>
+    <string name="sleep_timer_notification_content">Sleep timer is scheduled. Your device will lock itself in %s</string>
+    <string name="sleep_timer_notification_cancel">Cancel</string>
+    <string name="sleep_timer_remaining_time_with_hour">%02d:%02d:%02d"</string>
+    <string name="sleep_timer_remaining_time_without_hour">%02d:%02d"</string>
+</resources>

app/src/main/res/values/styles.xml

@@ -0,0 +1,6 @@
+<resources>
+    <style name="Widget.Theme.MyApplication.MyView" parent="">
+        <item name="android:background">@color/gray_400</item>
+        <item name="exampleColor">@color/light_blue_400</item>
+    </style>
+</resources>

app/src/main/res/values/themes.xml

@@ -0,0 +1,53 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Base.Theme.MyApplication" parent="Theme.Material3.DayNight.NoActionBar">
+        <item name="colorPrimary">@color/md_theme_primary</item>
+        <item name="colorOnPrimary">@color/md_theme_onPrimary</item>
+        <item name="colorPrimaryContainer">@color/md_theme_primaryContainer</item>
+        <item name="colorOnPrimaryContainer">@color/md_theme_onPrimaryContainer</item>
+        <item name="colorSecondary">@color/md_theme_secondary</item>
+        <item name="colorOnSecondary">@color/md_theme_onSecondary</item>
+        <item name="colorSecondaryContainer">@color/md_theme_secondaryContainer</item>
+        <item name="colorOnSecondaryContainer">@color/md_theme_onSecondaryContainer</item>
+        <item name="colorTertiary">@color/md_theme_tertiary</item>
+        <item name="colorOnTertiary">@color/md_theme_onTertiary</item>
+        <item name="colorTertiaryContainer">@color/md_theme_tertiaryContainer</item>
+        <item name="colorOnTertiaryContainer">@color/md_theme_onTertiaryContainer</item>
+        <item name="colorError">@color/md_theme_error</item>
+        <item name="colorOnError">@color/md_theme_onError</item>
+        <item name="colorErrorContainer">@color/md_theme_errorContainer</item>
+        <item name="colorOnErrorContainer">@color/md_theme_onErrorContainer</item>
+        <item name="android:colorBackground">@color/md_theme_background</item>
+        <item name="colorOnBackground">@color/md_theme_onBackground</item>
+        <item name="colorSurface">@color/md_theme_surface</item>
+        <item name="colorOnSurface">@color/md_theme_onSurface</item>
+        <item name="colorSurfaceVariant">@color/md_theme_surfaceVariant</item>
+        <item name="colorOnSurfaceVariant">@color/md_theme_onSurfaceVariant</item>
+        <item name="colorOutline">@color/md_theme_outline</item>
+        <item name="colorOutlineVariant">@color/md_theme_outlineVariant</item>
+        <item name="colorSurfaceInverse">@color/md_theme_inverseSurface</item>
+        <item name="colorOnSurfaceInverse">@color/md_theme_inverseOnSurface</item>
+        <item name="colorPrimaryInverse">@color/md_theme_inversePrimary</item>
+        <item name="colorPrimaryFixed">@color/md_theme_primaryFixed</item>
+        <item name="colorOnPrimaryFixed">@color/md_theme_onPrimaryFixed</item>
+        <item name="colorPrimaryFixedDim">@color/md_theme_primaryFixedDim</item>
+        <item name="colorOnPrimaryFixedVariant">@color/md_theme_onPrimaryFixedVariant</item>
+        <item name="colorSecondaryFixed">@color/md_theme_secondaryFixed</item>
+        <item name="colorOnSecondaryFixed">@color/md_theme_onSecondaryFixed</item>
+        <item name="colorSecondaryFixedDim">@color/md_theme_secondaryFixedDim</item>
+        <item name="colorOnSecondaryFixedVariant">@color/md_theme_onSecondaryFixedVariant</item>
+        <item name="colorTertiaryFixed">@color/md_theme_tertiaryFixed</item>
+        <item name="colorOnTertiaryFixed">@color/md_theme_onTertiaryFixed</item>
+        <item name="colorTertiaryFixedDim">@color/md_theme_tertiaryFixedDim</item>
+        <item name="colorOnTertiaryFixedVariant">@color/md_theme_onTertiaryFixedVariant</item>
+        <item name="colorSurfaceDim">@color/md_theme_surfaceDim</item>
+        <item name="colorSurfaceBright">@color/md_theme_surfaceBright</item>
+        <item name="colorSurfaceContainerLowest">@color/md_theme_surfaceContainerLowest</item>
+        <item name="colorSurfaceContainerLow">@color/md_theme_surfaceContainerLow</item>
+        <item name="colorSurfaceContainer">@color/md_theme_surfaceContainer</item>
+        <item name="colorSurfaceContainerHigh">@color/md_theme_surfaceContainerHigh</item>
+        <item name="colorSurfaceContainerHighest">@color/md_theme_surfaceContainerHighest</item>
+    </style>
+
+    <style name="Theme.MyApplication" parent="Base.Theme.MyApplication" />
+</resources>

app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older that API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>

app/src/main/res/xml/device_admin.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<device-admin xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-policies>
+        <force-lock />
+    </uses-policies>
+</device-admin>

app/src/test/java/com/aldo/apps/familyhelpers/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package com.aldo.apps.familyhelpers;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}