[Cleanup] Added translations, made use of resources, etc

Some cleanup, added resources for dimensions, added
translations.

app/build.gradle

@@ -43,7 +43,7 @@ dependencies {
 
     // Glide
     implementation 'com.github.bumptech.glide:glide:4.16.0'
-    implementation 'androidx.preference:preference:1.2.0'// Check for the latest version
+    implementation 'androidx.preference:preference:1.2.1'
     annotationProcessor 'com.github.bumptech.glide:compiler:4.16.0'
 
     //CircleImageView

app/src/main/AndroidManifest.xml

@@ -2,6 +2,10 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-feature
+        android:name="android.hardware.camera"
+        android:required="false" />
+
     <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" />
@@ -9,6 +13,7 @@
     <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
+    <uses-permission android:name="android.permission.CAMERA" />
 
     <application
         android:allowBackup="true"
@@ -19,26 +24,40 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.MyApplication"
-        tools:targetApi="31">
+        tools:targetApi="33">
-        <activity
-            android:name=".SettingsActivity"
-            android:exported="false"
-            android:label="@string/title_activity_settings" />
 
         <meta-data
             android:name="com.google.android.geo.API_KEY"
-            android:value="AIzaSyBrwogmBLNjbhngmON_RWhKrV1woF6ypR4" />
+            android:value="AIzaSyB7C4QCJEBvS7mFa_DeIZdzqe2hddtl-vk" />
+
+        <activity
+            android:name=".FlashlightActivity"
+            android:exported="false"
+            android:screenOrientation="portrait"
+            tools:ignore="LockedOrientationActivity" />
+        <activity
+            android:name=".SettingsActivity"
+            android:exported="false"
+            android:label="@string/title_activity_settings"
+            android:screenOrientation="portrait"
+            tools:ignore="LockedOrientationActivity" />
 
         <activity
             android:name=".HelperGridActivity"
-            android:exported="true">
+            android:exported="true"
+            android:screenOrientation="portrait"
+            tools:ignore="LockedOrientationActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity android:name=".ShareLocationActivity" />
+
+        <activity
+            android:name=".ShareLocationActivity"
+            android:screenOrientation="portrait"
+            tools:ignore="LockedOrientationActivity" />
 
         <service
             android:name=".workers.SleepTimerHelper"

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

@@ -0,0 +1,117 @@
+package com.aldo.apps.familyhelpers;
+
+import androidx.annotation.RequiresApi;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.graphics.PorterDuff;
+import android.os.Build;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.ImageView;
+
+import com.aldo.apps.familyhelpers.ui.FlashLightLevelShifter;
+import com.aldo.apps.familyhelpers.utils.FlashlightHelper;
+import com.google.android.material.button.MaterialButton;
+
+/**
+ * Activity offering access to the devices flashlight and offering some helper methods to it.
+ */
+ @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
+public class FlashlightActivity extends AppCompatActivity {
+
+    /**
+     * Tag for debugging purpose.
+     */
+    private static final String TAG = "FlashlightActivity";
+
+    /**
+     * {@link ImageView} indicating the current status of the flashlight.
+     */
+    private ImageView mLightOnIndicator;
+
+    /**
+     * The custom view {@link FlashLightLevelShifter} to adjust the privacy.
+     */
+    private FlashLightLevelShifter mFlashlightLevelShifter;
+
+    /**
+     * Helper class to handle flashlight related code.
+     */
+    private FlashlightHelper mFlashlightHelper;
+
+    @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_flashlight);
+
+        initButtons();
+        mLightOnIndicator = findViewById(R.id.flashlight_status_indicator);
+        mFlashlightLevelShifter = findViewById(R.id.flashlight_level_shifter);
+        mFlashlightHelper = new FlashlightHelper(this);
+
+        mFlashlightLevelShifter.setMaxProgress(mFlashlightHelper.getMaxBrightness());
+        mFlashlightLevelShifter.setProgress(mFlashlightHelper.getCurrentBrightness());
+
+        mLightOnIndicator.setOnClickListener(v -> mFlashlightHelper.toggleFlashlight());
+
+        mFlashlightLevelShifter.setOnProgressChangedListener(progress
+                -> mFlashlightHelper.setFlashlightBrightness(progress));
+
+        mFlashlightHelper.getStatusObservable()
+                .subscribe(this::onFlashlightStatusChanged, this::handleSubscriptionError);
+    }
+
+    private void initButtons() {
+        final MaterialButton minimumBrightness = findViewById(R.id.btn_flashlight_lowest);
+        minimumBrightness.setOnClickListener(v -> {
+            mFlashlightLevelShifter.setProgress(1);
+            mFlashlightHelper.setFlashlightBrightness(1);
+        });
+        final MaterialButton mediumBrightness = findViewById(R.id.btn_flashlight_medium);
+        mediumBrightness.setOnClickListener(v -> {
+            final int maxBrightness = mFlashlightHelper.getMaxBrightness();
+            mFlashlightLevelShifter.setProgress(maxBrightness/2);
+            mFlashlightHelper.setFlashlightBrightness(maxBrightness/2);
+        });
+        final MaterialButton maximumBrightness = findViewById(R.id.btn_flashlight_maximum);
+        maximumBrightness.setOnClickListener(v -> {
+            final int maxBrightness = mFlashlightHelper.getMaxBrightness();
+            mFlashlightLevelShifter.setProgress(maxBrightness);
+            mFlashlightHelper.setFlashlightBrightness(maxBrightness);
+        });
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        mFlashlightHelper.destroy();
+    }
+
+    /**
+     * Apply new ImageResource and color to the {@link #mLightOnIndicator}.
+     *
+     * @param status true if flashlight on, false otherwise.
+     */
+    private void onFlashlightStatusChanged(final boolean status) {
+        if (status) {
+            mLightOnIndicator.setImageResource(R.drawable.ic_flashlight_on);
+            mLightOnIndicator.setColorFilter(getColor(
+                    R.color.md_theme_primary_highContrast), PorterDuff.Mode.SRC_IN);
+        } else {
+            mLightOnIndicator.setImageResource(R.drawable.ic_flashlight_off);
+            mLightOnIndicator.setColorFilter(getColor(
+                    R.color.md_theme_outline), PorterDuff.Mode.SRC_IN);
+        }
+    }
+
+    /**
+     * Helper method to print any potential errors while subscribing to the current status observable.
+     *
+     * @param throwable The error that has been thrown.
+     */
+    private void handleSubscriptionError(final Throwable throwable) {
+        Log.e(TAG, "handleSubscriptionError: Error while listening to flashlight status", throwable);
+    }
+}

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

@@ -1,5 +1,6 @@
 package com.aldo.apps.familyhelpers;
 
+import static android.Manifest.permission.CAMERA;
 import static android.Manifest.permission.POST_NOTIFICATIONS;
 import static com.aldo.apps.familyhelpers.utils.GlobalConstants.SIGN_IN_PROVIDERS;
 
@@ -50,6 +51,11 @@ public class HelperGridActivity extends AppCompatActivity {
      */
     private HelperGroupTile mShareLocationTile;
 
+    /**
+     * {@link HelperGroupTile} holding the flashlight.
+     */
+    private HelperGroupTile mFlashlightTile;
+
     /**
      * {@link HelperGroupTile} holding the settings.
      */
@@ -115,6 +121,7 @@ public class HelperGridActivity extends AppCompatActivity {
         mDevicePolicyHelper = DevicePolicyManagerHelper.getInstance(this);
         initSleepTimer();
         initShareLocation();
+        initFlashlight();
         initSettings();
     }
 
@@ -173,6 +180,23 @@ public class HelperGridActivity extends AppCompatActivity {
         mShareLocationTile.setTitle(R.string.title_share_location);
     }
 
+    /**
+     * Helper method to initialize the settings tile.
+     */
+    private void initFlashlight() {
+        mFlashlightTile = new HelperGroupTile(findViewById(R.id.tile_flashlight)) {
+            @Override
+            public void launchHelper() {
+                if (requestCameraPermission()) {
+                    final Intent intent = new Intent(HelperGridActivity.this, FlashlightActivity.class);
+                    startActivity(intent);
+                }
+            }
+        };
+        mFlashlightTile.setTitle(R.string.title_flashlight);
+        mFlashlightTile.setLogo(R.drawable.ic_flashlight);
+    }
+
     /**
      * Helper method to initialize the settings tile.
      */
@@ -208,6 +232,27 @@ public class HelperGridActivity extends AppCompatActivity {
         }
     }
 
+    /**
+     * Helper method to request the CameraPermission as it is required to access the
+     * flashlight settings.
+     *
+     * @return true if the permission is granted, false otherwise.
+     */
+    private boolean requestCameraPermission() {
+        if (ContextCompat.checkSelfPermission(this, CAMERA) ==
+                PackageManager.PERMISSION_GRANTED) {
+            // Permission already granted
+            return true;
+        } else {
+            if (shouldShowRequestPermissionRationale(CAMERA)) {
+                Toast.makeText(HelperGridActivity.this, R.string.flashlight_camera_rationale,
+                        Toast.LENGTH_LONG).show();
+            }
+            mRequestPermissionLauncher.launch(CAMERA);
+            return false;
+        }
+    }
+
     /**
      * Handle the result of the sign in flow.
      *

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

@@ -0,0 +1,317 @@
+package com.aldo.apps.familyhelpers.ui;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RectF;
+import android.util.AttributeSet;
+import android.util.TypedValue;
+import android.view.MotionEvent;
+import android.view.View;
+
+import com.aldo.apps.familyhelpers.R;
+
+/**
+ * A custom SeekBar-like view for displaying and selecting a discrete level,
+ * such as a flashlight brightness level.  The view is composed of vertically
+ * stacked segments, where the number of segments is determined by the
+ * {@code maxProgress} property.
+ *
+ * NOTE: This class was mainly generated and documented by Google-AI.
+ */
+public class FlashLightLevelShifter extends View {
+
+    /**
+     * The paint used to draw the level segments.
+     */
+    private final Paint mLevelPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
+
+    /**
+     * The rectangle used to define the boundaries of each level segment.
+     */
+    private final RectF mLevelRect = new RectF();
+
+    /**
+     * The width of the canvas.
+     */
+    private int mCanvasWidth = 0;
+
+    /**
+     * The height of the canvas.
+     */
+    private int mCanvasHeight = 0;
+
+    /**
+     * The bitmap used to cache the progress drawing.
+     */
+    private Bitmap mProgressBitmap;
+
+    /**
+     * Listener interface for progress change events.
+     */
+    private SeekBarChangeListener mOnProgressChangedListener;
+
+    /**
+     * The maximum progress value.  This determines the number of segments.
+     */
+    private int mMaxProgress = 1;
+
+    /**
+     * The current progress value.
+     */
+    private int mProgress = 1;
+
+    /**
+     * The background color of the level segments.
+     */
+    private int mLevelBackgroundColor = Color.LTGRAY;
+
+    /**
+     * The corner radius of the level segments.
+     */
+    private float mLevelCornerRadius;
+
+    /**
+     * The gap between level segments.
+     */
+    private float mLevelGap;
+
+    /**
+     * The color of the filled level segments (representing progress).
+     */
+    private int mLevelProgressColor = Color.WHITE;
+
+    /**
+     * Constructor for FlashLightLevelShifter.
+     *
+     * @param context The context.
+     */
+    public FlashLightLevelShifter(final Context context) {
+        this(context, null);
+    }
+
+    /**
+     * Constructor for FlashLightLevelShifter.
+     *
+     * @param context The context.
+     * @param attrs   The attribute set.
+     */
+    public FlashLightLevelShifter(final Context context, final AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    /**
+     * Constructor for FlashLightLevelShifter.
+     *
+     * @param context      The context.
+     * @param attrs        The attribute set.
+     * @param defStyleAttr The default style attribute.
+     */
+    public FlashLightLevelShifter(final Context context, final AttributeSet attrs, final int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+
+        mLevelCornerRadius = calculateDp(4);
+        mLevelGap = calculateDp(2);
+
+        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.FlashLightLevelShifter);
+        mLevelBackgroundColor = typedArray.getColor(
+                R.styleable.FlashLightLevelShifter_level_background_color,
+                mLevelBackgroundColor
+        );
+        mLevelCornerRadius = typedArray.getDimension(
+                R.styleable.FlashLightLevelShifter_level_corner_radius,
+                mLevelCornerRadius
+        );
+        mLevelGap = typedArray.getDimension(R.styleable.FlashLightLevelShifter_level_gap, mLevelGap);
+        mLevelProgressColor = typedArray.getColor(
+                R.styleable.FlashLightLevelShifter_level_progress_color,
+                mLevelProgressColor
+        );
+        typedArray.recycle();
+    }
+
+    /**
+     * Gets the maximum progress value.
+     *
+     * @return The maximum progress value.
+     */
+    public int getMaxProgress() {
+        return mMaxProgress;
+    }
+
+    /**
+     * Sets the maximum progress value.
+     *
+     * @param maxProgress The maximum progress value.
+     */
+    public void setMaxProgress(final int maxProgress) {
+        this.mMaxProgress = maxProgress;
+        this.mProgress = maxProgress;
+        invalidate();
+    }
+
+    /**
+     * Gets the current progress value.
+     *
+     * @return The current progress value.
+     */
+    public int getProgress() {
+        return mProgress;
+    }
+
+    /**
+     * Sets the current progress value.
+     *
+     * @param progress The current progress value.
+     */
+    public void setProgress(final int progress) {
+        setProgressInternal(progress);
+    }
+
+    @Override
+    protected void onSizeChanged(final int w, final int h, final int oldw, final int oldh) {
+        super.onSizeChanged(w, h, oldw, oldh);
+        mCanvasWidth = w;
+        mCanvasHeight = h;
+        mProgressBitmap = Bitmap.createBitmap(getAvailableWidth(), getAvailableHeight(), Bitmap.Config.ARGB_8888);
+    }
+
+    @Override
+    protected void onDraw(final Canvas canvas) {
+        canvas.clipRect(
+                getPaddingLeft(),
+                getPaddingTop(),
+                mCanvasWidth,
+                mCanvasHeight
+        );
+        int availableWidth = getAvailableWidth();
+        int availableHeight = getAvailableHeight();
+        float totalLevelHeight = (float) availableHeight / mMaxProgress;
+        float levelHeight = totalLevelHeight - mLevelGap;
+
+        float previousLevelBottom = getPaddingTop();
+
+        for (int i = 0; i < mMaxProgress; i++) {
+            mLevelRect.set(
+                    getPaddingLeft(),
+                    previousLevelBottom,
+                    availableWidth + getPaddingRight(),
+                    previousLevelBottom + levelHeight
+            );
+            if (i + 1 <= mProgress) {
+                mLevelPaint.setColor(mLevelBackgroundColor);
+            } else {
+                mLevelPaint.setColor(mLevelProgressColor);
+            }
+            canvas.drawRoundRect(mLevelRect, mLevelCornerRadius, mLevelCornerRadius, mLevelPaint);
+            previousLevelBottom = mLevelRect.bottom + mLevelGap;
+        }
+    }
+
+    /**
+     * Sets the listener for progress change events.
+     *
+     * @param changedListener The listener to set.
+     */
+    public void setOnProgressChangedListener(final SeekBarChangeListener changedListener) {
+        mOnProgressChangedListener = changedListener;
+    }
+
+    /**
+     *
+     * @param event
+     */
+    private void updateProgress(final MotionEvent event) {
+        if (getRawProgress(event) != mProgress) {
+            mProgress = getRawProgress(event);
+            if (mOnProgressChangedListener != null) {
+                mOnProgressChangedListener.onProgressChanged(mMaxProgress - mProgress);
+            }
+            invalidate();
+        }
+    }
+
+    /**
+     * Gets the raw progress value from a MotionEvent.
+     *
+     * @param event The MotionEvent.
+     * @return The raw progress value.
+     */
+    private int getRawProgress(final MotionEvent event) {
+        return Math.round(mMaxProgress * event.getY() / getAvailableHeight());
+    }
+
+    /**
+     * Sets the progress internally and triggers a redraw.
+     *
+     * @param progress The new progress value.
+     */
+    protected void setProgressInternal(final int progress) {
+        this.mProgress = mMaxProgress - progress;
+        invalidate();
+    }
+
+    /**
+     * Gets the available width for drawing the level segments.
+     *
+     * @return The available width.
+     */
+    private int getAvailableWidth() {
+        int width = mCanvasWidth - getPaddingLeft() - getPaddingRight();
+        if (width <= 0) width = 1;
+        return width;
+    }
+
+    /**
+     * Gets the available height for drawing the level segments.
+     *
+     * @return The available height.
+     */
+    private int getAvailableHeight() {
+        int height = mCanvasHeight - getPaddingTop() - getPaddingBottom();
+        if (height <= 0) height = 1;
+        return height;
+    }
+
+    @Override
+    public boolean onTouchEvent(final MotionEvent event) {
+        if (!isEnabled()) return false;
+
+        if (event != null) {
+            updateProgress(event);
+            performClick();
+        }
+        return true;
+    }
+
+    @Override
+    public boolean performClick() {
+        super.performClick();
+        return true;
+    }
+
+    private float calculateDp(final int dp) {
+        return TypedValue.applyDimension(
+                TypedValue.COMPLEX_UNIT_DIP,
+                dp,
+                getResources().getDisplayMetrics()
+        );
+    }
+
+    /**
+     * Interface definition for a callback to be invoked when the progress
+     * level is changed.
+     */
+    public interface SeekBarChangeListener {
+
+        /**
+         * Called when the progress level is changed.
+         *
+         * @param progress The new progress level.
+         */
+        void onProgressChanged(final int progress);
+    }
+}

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

@@ -0,0 +1,202 @@
+package com.aldo.apps.familyhelpers.utils;
+
+import android.content.Context;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraCharacteristics;
+import android.hardware.camera2.CameraManager;
+import android.os.Build;
+import android.text.TextUtils;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
+
+import io.reactivex.rxjava3.subjects.BehaviorSubject;
+
+/**
+ * Helper class to encapsulate all flashlight related logic.
+ */
+public class FlashlightHelper {
+
+    /**
+     * Tag for debugging purposes.
+     */
+    private static final String TAG = "FlashlightHelper";
+
+    /**
+     * {@link BehaviorSubject} holding the current status of the flashlight.
+     */
+    private final BehaviorSubject<Boolean> mFlashlightStatusObservable = BehaviorSubject.createDefault(false);
+
+    /**
+     * The {@link CameraManager} to get access to the flashlight.
+     */
+    private final CameraManager mCameraManager;
+
+    /**
+     * Unique identifier of the camera that has a flashlight.
+     */
+    private String mCameraId;
+
+    /**
+     * Max available brightness level.
+     */
+    private Integer mMaxBrightness;
+
+    /**
+     * The currently selected brightness level (defaults to MAX)
+     */
+    private Integer mCurrentBrightness;
+
+    /**
+     * The {@link CameraManager.TorchCallback} to be invoked when the flashlight status or availability
+     * changes.
+     */
+    private final CameraManager.TorchCallback mTorchCallback = new CameraManager.TorchCallback() {
+        @Override
+        public void onTorchModeUnavailable(@NonNull final String cameraId) {
+            super.onTorchModeUnavailable(cameraId);
+            if (TextUtils.equals(mCameraId, cameraId)) {
+                Log.d(TAG, "onTorchModeUnavailable: Flashlight became unavailable, propagate off");
+                mFlashlightStatusObservable.onNext(false);
+            }
+        }
+
+        @Override
+        public void onTorchModeChanged(@NonNull final String cameraId, final boolean enabled) {
+            super.onTorchModeChanged(cameraId, enabled);
+            if (TextUtils.equals(mCameraId, cameraId)) {
+                Log.d(TAG, "onTorchModeChanged: Flashlight Status changed to [" + enabled + "]");
+                mFlashlightStatusObservable.onNext(enabled);
+            }
+        }
+    };
+
+    /**
+     * C'Tor.
+     *
+     * @param context The {@link Context} from where this was instantiated.
+     */
+    @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
+    public FlashlightHelper(final Context context) {
+        mCameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
+        mCameraManager.registerTorchCallback(mTorchCallback, null);
+        try {
+            for (final String camId : mCameraManager.getCameraIdList()) {
+                final CameraCharacteristics characteristics = mCameraManager.getCameraCharacteristics(camId);
+                if (Boolean.TRUE.equals(characteristics.get(CameraCharacteristics.FLASH_INFO_AVAILABLE))) {
+                    mCameraId = camId;
+                    mMaxBrightness = characteristics.get(CameraCharacteristics.FLASH_INFO_STRENGTH_MAXIMUM_LEVEL);
+                    mCurrentBrightness = characteristics.get(CameraCharacteristics.FLASH_INFO_STRENGTH_MAXIMUM_LEVEL);
+                    Log.d(TAG, "maxAvailable = [" + mMaxBrightness + "], current = [" + mCurrentBrightness + "]");
+                    break;
+                }
+            }
+        } catch (final CameraAccessException e) {
+            Log.e(TAG, "onCreate: ", e);
+        }
+    }
+
+    /**
+     * Returns the {@link BehaviorSubject} holding the current status of the flashlight.
+     *
+     * @return The {@link BehaviorSubject} holding the current status of the flashlight.
+     */
+    public BehaviorSubject<Boolean> getStatusObservable() {
+        return mFlashlightStatusObservable;
+    }
+
+    /**
+     * Returns the max available brightness.
+     *
+     * @return The max available brightness.
+     */
+    public int getMaxBrightness() {
+        return mMaxBrightness == null ? 1 : mMaxBrightness;
+    }
+
+    /**
+     * Returns the currently set brightness.
+     *
+     * @return The currently set brightness.
+     */
+    public int getCurrentBrightness() {
+        return mCurrentBrightness;
+    }
+
+    /**
+     * Helper method to toggle the flashlight to on/off based on the current state.
+     */
+    public void toggleFlashlight() {
+        if (mFlashlightStatusObservable.getValue()) {
+            Log.d(TAG, "toggleFlashlight: Turning off flashlight");
+            turnFlashlightOff();
+        } else {
+            Log.d(TAG, "toggleFlashlight: Turning on flashlight");
+            turnFlashlightOn();
+        }
+    }
+
+    /**
+     * Sets the provided brightness level if applicable to the flashlight and turns it on.
+     *
+     * @param brightnessLevel The brightness level to be set.
+     */
+    @RequiresApi(api = Build.VERSION_CODES.TIRAMISU)
+    public void setFlashlightBrightness(final int brightnessLevel) {
+        if (mCameraId == null) {
+            Log.e("setFlashlightBrightness", "No camera with flash found.");
+            return;
+        }
+
+        if (brightnessLevel > mMaxBrightness || brightnessLevel < 1) {
+            Log.d(TAG, "setFlashlightBrightness: Invalid brightness setting [" + brightnessLevel + "], ignore...");
+            return;
+        }
+
+        try {
+            mCameraManager.turnOnTorchWithStrengthLevel(mCameraId, brightnessLevel);
+        } catch (final CameraAccessException e) {
+            Log.e("setFlashlightBrightness", "Error setting torch brightness: " + e.getMessage());
+        }
+    }
+
+    /**
+     * Turn on the flashlight without changing the brightness level.
+     */
+    public void turnFlashlightOn() {
+        if (mCameraId == null) {
+            Log.e("turnFlashlightOn", "No camera with flash found.");
+            return;
+        }
+
+        try{
+            mCameraManager.setTorchMode(mCameraId, true);
+        }catch (final CameraAccessException e){
+            Log.e("turnFlashlightOn", "Error turning torch on: " + e.getMessage());
+        }
+    }
+
+    /**
+     * Turns off the flashlight.
+     */
+    public void turnFlashlightOff() {
+        if (mCameraId == null) {
+            Log.e("turnFlashlightOff", "No camera with flash found.");
+            return;
+        }
+
+        try{
+            mCameraManager.setTorchMode(mCameraId, false);
+        }catch(final CameraAccessException e){
+            Log.e("turnFlashlightOff", "Error turning torch off: " + e.getMessage());
+        }
+    }
+
+    /**
+     * Clean up helper method.
+     */
+    public void destroy() {
+        mCameraManager.unregisterTorchCallback(mTorchCallback);
+    }
+}

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

@@ -0,0 +1,18 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="800dp"
+    android:height="800dp"
+    android:viewportWidth="512"
+    android:viewportHeight="512">
+  <path
+      android:pathData="M450.49,202.25L308.92,60.67c-19.51,-19.51 -51.27,-19.51 -70.79,0l-32.9,32.9c-11.37,11.37 -19.51,26.11 -22.82,42.63l-18.64,93.21L14.64,378.55c-19.52,19.52 -19.52,51.27 0,70.79l47.19,47.19c19.51,19.51 51.27,19.52 70.79,0l149.13,-149.13l93.21,-18.64c16.13,-3.23 30.97,-11.16 42.63,-22.82l32.9,-32.9C470.06,253.48 470.06,221.81 450.49,202.25zM109.02,472.93c-6.51,6.51 -17.09,6.51 -23.6,0l-47.19,-47.19c-6.51,-6.51 -6.51,-17.09 0,-23.6l11.8,-11.8l70.79,70.79L109.02,472.93zM144.42,437.54l-70.79,-70.79l46.52,-46.52l23.6,23.6c6.51,6.52 17.08,6.52 23.6,0c6.52,-6.52 6.52,-17.08 0,-23.6l-23.6,-23.6l35.4,-35.4l70.79,70.79L144.42,437.54zM279.01,313.92l-81.76,-81.76l15.73,-78.65l144.68,144.68L279.01,313.92zM426.9,249.44c-35.83,35.83 -33.6,33.66 -35.49,35.31L226.42,119.75c1.67,-1.92 -0.43,0.25 35.31,-35.48c6.5,-6.51 17.09,-6.51 23.59,0l141.58,141.58C433.42,232.37 433.42,242.92 426.9,249.44z"
+      android:fillColor="#000000"/>
+  <path
+      android:pathData="M473.8,36.79c-6.67,-6.36 -17.23,-6.1 -23.59,0.57L416.49,72.75c-6.36,6.67 -6.1,17.23 0.57,23.59c6.67,6.36 17.23,6.1 23.59,-0.57l33.72,-35.39C480.73,53.71 480.47,43.15 473.8,36.79z"
+      android:fillColor="#000000"/>
+  <path
+      android:pathData="M361.49,0.83c-9.22,0 -16.68,7.47 -16.68,16.68v33.37c0,9.22 7.47,16.68 16.68,16.68c9.22,0 16.68,-7.47 16.68,-16.68v-33.37C378.17,8.31 370.7,0.83 361.49,0.83z"
+      android:fillColor="#000000"/>
+  <path
+      android:pathData="M495.32,134.11h-33.37c-9.22,0 -16.68,7.47 -16.68,16.68s7.47,16.68 16.68,16.68h33.37c9.22,0 16.68,-7.47 16.68,-16.68S504.53,134.11 495.32,134.11z"
+      android:fillColor="#000000"/>
+</vector>

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

@@ -0,0 +1,36 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="200dp"
+    android:height="200dp"
+    android:viewportWidth="200"
+    android:viewportHeight="200">
+  <path
+      android:pathData="M37.87,83.58L163.58,83.58A7,7 0,0 1,170.58 90.58L170.58,115.56A7,7 0,0 1,163.58 122.56L37.87,122.56A7,7 0,0 1,30.87 115.56L30.87,90.58A7,7 0,0 1,37.87 83.58z"
+      android:strokeWidth="3"
+      android:fillColor="#fff"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M31.41,118.61L44.4,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M31.41,118.61L44.4,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M31.41,118.61L44.4,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M169.72,118.58L156.72,170.58"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M43.72,170.58L157.72,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+</vector>

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

@@ -0,0 +1,51 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="200dp"
+    android:height="200dp"
+    android:viewportWidth="200"
+    android:viewportHeight="200">
+  <path
+      android:pathData="M37.87,83.58L163.58,83.58A7,7 0,0 1,170.58 90.58L170.58,115.56A7,7 0,0 1,163.58 122.56L37.87,122.56A7,7 0,0 1,30.87 115.56L30.87,90.58A7,7 0,0 1,37.87 83.58z"
+      android:strokeWidth="3"
+      android:fillColor="#fff"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M31.41,118.61L44.4,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M31.41,118.61L44.4,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M31.41,118.61L44.4,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M169.72,118.58L156.72,170.58"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M43.72,170.58L157.72,170.24"
+      android:strokeWidth="3"
+      android:fillColor="#00000000"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M100,14.44L100,14.44A8.12,10 0,0 1,108.12 24.44L108.12,54.62A8.12,10 0,0 1,100 64.62L100,64.62A8.12,10 0,0 1,91.88 54.62L91.88,24.44A8.12,10 0,0 1,100 14.44z"
+      android:strokeWidth="3"
+      android:fillColor="#fff"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M44.47,19.7L44.47,19.7A10,8.12 58,0 1,56.65 23.87L72.65,49.47A10,8.12 58,0 1,71.06 62.25L71.06,62.25A10,8.12 58,0 1,58.87 58.08L42.88,32.48A10,8.12 58,0 1,44.47 19.7z"
+      android:strokeWidth="3"
+      android:fillColor="#fff"
+      android:strokeColor="#000"/>
+  <path
+      android:pathData="M157.34,19.7L157.34,19.7A10,8.12 122,0 1,158.93 32.48L142.94,58.08A10,8.12 122,0 1,130.75 62.25L130.75,62.25A10,8.12 122,0 1,129.16 49.47L145.15,23.87A10,8.12 122,0 1,157.34 19.7z"
+      android:strokeWidth="3"
+      android:fillColor="#fff"
+      android:strokeColor="#000"/>
+</vector>

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

@@ -1,16 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="75dp"
+    android:layout_width="@dimen/active_share_view_holder_width"
-    android:layout_height="75dp"
+    android:layout_height="@dimen/active_share_view_holder_height"
     android:background="@drawable/currently_followed_user_selector"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools">
 
     <de.hdodenhof.circleimageview.CircleImageView
         android:id="@+id/active_share_profile_picture"
-        android:layout_width="50dp"
+        android:layout_width="@dimen/active_share_profile_picture_width"
-        android:layout_height="50dp"
+        android:layout_height="@dimen/active_share_profile_picture_height"
-        app:civ_border_width="2dp"
+        app:civ_border_width="@dimen/active_share_profile_picture_border_width"
         app:civ_border_color="#FF000000"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
@@ -20,7 +20,7 @@
         android:id="@+id/active_share_name"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:textSize="11sp"
+        android:textSize="@dimen/active_share_profile_name_text_size"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         android:gravity="center"

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

@@ -0,0 +1,74 @@
+<?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"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    tools:context=".FlashlightActivity">
+
+    <ImageView
+        android:id="@+id/flashlight_status_indicator"
+        android:src="@drawable/ic_flashlight_off"
+        android:layout_width="@dimen/flashlight_header_image_width"
+        android:layout_height="wrap_content"
+        app:tint="@color/md_theme_outline"
+        app:layout_constraintBottom_toTopOf="@id/flashlight_level_shifter"
+        app:layout_constraintStart_toStartOf="@id/flashlight_level_shifter"
+        app:layout_constraintEnd_toEndOf="@id/flashlight_level_shifter"/>
+
+    <com.aldo.apps.familyhelpers.ui.FlashLightLevelShifter
+        android:id="@+id/flashlight_level_shifter"
+        android:layout_width="@dimen/flashlight_level_shifter_width"
+        android:layout_height="match_parent"
+        android:layout_marginTop="@dimen/flashlight_level_shifter_margin_top"
+        android:layout_marginEnd="@dimen/flashlight_level_shifter_margin_end"
+        android:layout_marginBottom="@dimen/flashlight_activity_margin_bottom"
+        app:level_background_color="@color/md_theme_outline"
+        app:level_corner_radius="@dimen/flashlight_level_shifter_corner_radius"
+        app:level_gap="@dimen/flashlight_level_shifter_level_gap"
+        app:level_progress_color="@color/md_theme_primary_highContrast"
+        app:layout_constraintEnd_toEndOf="parent"/>
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_flashlight_lowest"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:maxLines="@integer/flashlight_material_button_max_lines"
+        android:lines="@integer/flashlight_material_button_lines"
+        android:layout_marginStart="@dimen/flashlight_material_button_margin_start"
+        android:layout_marginEnd="@dimen/flashlight_material_button_margin_end"
+        android:layout_marginBottom="@dimen/flashlight_activity_margin_bottom"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/flashlight_level_shifter"
+        android:text="@string/flashlight_set_min_level"/>
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_flashlight_medium"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:maxLines="@integer/flashlight_material_button_max_lines"
+        android:lines="@integer/flashlight_material_button_lines"
+        app:layout_constrainedWidth="true"
+        android:layout_marginStart="@dimen/flashlight_material_button_margin_start"
+        android:layout_marginEnd="@dimen/flashlight_material_button_margin_end"
+        app:layout_constraintBottom_toTopOf="@id/btn_flashlight_lowest"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/flashlight_level_shifter"
+        android:text="@string/flashlight_set_med_level"/>
+
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btn_flashlight_maximum"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:maxLines="@integer/flashlight_material_button_max_lines"
+        android:lines="@integer/flashlight_material_button_lines"
+        android:layout_marginStart="@dimen/flashlight_material_button_margin_start"
+        android:layout_marginEnd="@dimen/flashlight_material_button_margin_end"
+        app:layout_constrainedWidth="true"
+        app:layout_constraintBottom_toTopOf="@id/btn_flashlight_medium"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toStartOf="@id/flashlight_level_shifter"
+        android:text="@string/flashlight_set_max_level"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -25,21 +25,28 @@
 
         <include layout="@layout/helper_group_tile_item"
             android:id="@+id/tile_sleep_timer"
-            android:layout_margin="10dp"
+            android:layout_margin="@dimen/main_helper_group_item_margin"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_columnWeight="1"/>
 
         <include layout="@layout/helper_group_tile_item"
             android:id="@+id/tile_share_location"
-            android:layout_margin="10dp"
+            android:layout_margin="@dimen/main_helper_group_item_margin"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_columnWeight="1"/>
+
+        <include layout="@layout/helper_group_tile_item"
+            android:id="@+id/tile_flashlight"
+            android:layout_margin="@dimen/main_helper_group_item_margin"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_columnWeight="1"/>
 
         <include layout="@layout/helper_group_tile_item"
             android:id="@+id/tile_settings"
-            android:layout_margin="10dp"
+            android:layout_margin="@dimen/main_helper_group_item_margin"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_columnWeight="1"/>

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

@@ -9,7 +9,7 @@
     <androidx.constraintlayout.widget.ConstraintLayout
         android:id="@+id/active_share_container"
         android:layout_width="match_parent"
-        android:layout_height="75dp"
+        android:layout_height="@dimen/share_location_active_share_container_height"
         app:layout_constraintTop_toTopOf="parent">
 
         <TextView
@@ -29,7 +29,6 @@
             android:scrollbars="horizontal"
             android:visibility="gone"/>
 
-
     </androidx.constraintlayout.widget.ConstraintLayout>
 
     <androidx.fragment.app.FragmentContainerView
@@ -56,8 +55,8 @@
 
         <ImageView
             android:id="@+id/share_location_info_user_icon"
-            android:layout_width="40dp"
+            android:layout_width="@dimen/share_location_currently_following_picture_width"
-            android:layout_height="40dp"
+            android:layout_height="@dimen/share_location_currently_following_picture_height"
             app:layout_constraintTop_toTopOf="parent"
             app:layout_constraintEnd_toEndOf="parent"/>
 

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

@@ -12,8 +12,8 @@
 
     <ImageView
         android:id="@+id/iv_helper_group_icon"
-        android:layout_width="75dp"
+        android:layout_width="@dimen/helper_group_item_image_width"
-        android:layout_height="75dp"
+        android:layout_height="@dimen/helper_group_item_image_height"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
@@ -26,12 +26,10 @@
         app:layout_constraintTop_toBottomOf="@id/iv_helper_group_icon"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
+        android:gravity="center"
         tools:text="Sleep Timer"
         android:textStyle="bold"
-        android:maxLines="1"
+        android:maxLines="@integer/helper_group_item_title_max_lines"
         android:textColor="@color/md_theme_primary"
         />
-
-
-
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Doerflinger-Helpers</string>
+    <string name="warning_no_device_admin">Diese Aktion benötigt spezielle Geräte-Administratoren Rechte, bitte ertile diese bevor du weitermachts</string>
+    <string name="welcome_message_placeholder">Wilkommen <b>%s</b></string>
+    <string name="welcome_message_test">Wilkommen <b>Test Nutzer</b></string>
+    <string name="unknown_user">Unbekannter Nutzer</string>
+    <string name="title_sleep_timer">Sleep Timer</string>
+    <string name="description_sleep_timer">Bietet die Möglichkeit, einen Sleep Timer zu setzen, nach dem das Display ausgeschalten wird</string>
+    <string name="sleep_timer_rationale_device_admin">Geräte-Administratoren Rechte werden benötigt um den Bildschirm nach einem Timeout auszuschalten</string>
+    <string name="sleep_timer_show_notifications_rationale">Für diese Funktion wird die Berechtigung eine Benachrichtigung anzuzeigen benötigt</string>
+    <string name="sleep_timer_notification_content">Sleep-Timer läuft. Das Gerät wird in %s gesperrt</string>
+    <string name="sleep_timer_notification_cancel">Abbrechen</string>
+    <string name="title_share_location">Standort teilen</string>
+    <string name="share_location_notification_content">Du teilst deinen Standort gerade mit der Familie.</string>
+    <string name="share_location_no_sharings_in_progress">Aktuell teilt niemand seinen Standort</string>
+    <string name="share_location_info_title_empty">Du folgst gerade niemandem</string>
+    <string name="share_location_info_title">Du folgst %s</string>
+    <string name="share_location_info_location">Letzter bekannter Standort = %f;%f</string>
+    <string name="share_location_info_altitude">Letze bekannte Höhe = %.2f Meter</string>
+    <string name="share_location_info_speed">Letzte bekannte Geschwindigkeit: %.2f m/s (%.1f km/h)</string>
+    <string name="share_location_info_timestamp">Dieses Update wurde empfangen: %s</string>
+    <string name="share_location_toggle_button">Teile deinen Standort</string>
+    <string name="share_location_background_permission_rationale">Um deinen Standort auch zu teilen, während die App im Hintergrund ist, bitte wähle die \"Immer\" Option.</string>
+    <string name="title_activity_settings">Einstellungen</string>
+    <string name="title_flashlight">Taschenlampe</string>
+    <string name="flashlight_camera_rationale">Um auf die Taschenlampe zugreifen zu können, wird die Kamera Berechtigung gebraucht.</string>
+    <string name="flashlight_set_min_level">Aktiviere die Taschenlampe auf minimaler Helligkeit</string>
+    <string name="flashlight_set_med_level">Aktiviere die Taschenlampe auf mittlerer Helligkeit</string>
+    <string name="flashlight_set_max_level">Aktiviere die Taschenlampe auf maximaler Helligkeit</string>
+    <string name="title_settings">Einstellungen</string>
+    <string name="pref_share_location_header">Standort teilen</string>
+    <string name="pref_share_location_freq_title">Standort Update Frequenz</string>
+    <string name="pref_share_location_freq_summary">Die Minimal-Zeit in Sekunden zwischen zwei Standort updates. <b>Achtung:</b> Je niedriger dieser Wert, desto höher die Akku-Belastung</string>
+    <string name="pref_auto_accuracy_title">Automatische Genauigkeit</string>
+    <string name="pref_auto_accuracy_summary_on">Die Genauigkeit wird automatisch ausgewählt je nach Ladezustand des Geräts</string>
+    <string name="pref_auto_accuracy_summary_off">Wähle \"Hohe Genauigkeit\" oder \"Akku sparen\" unten aus</string>
+    <string name="pref_manual_accuracy_title">Hohe Genauigkeit erzwingen</string>
+    <string name="pref_manual_accuracy_summary_on">Hohe Genauigkeit, leert aber vermutlich den Akku schneller</string>
+    <string name="pref_manual_accuracy_summary_off">Niedrigere Genauigkeit, aber bessere Akku-Lebensdauer</string>
+</resources>

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

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<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>
+    <string name="welcome_message_placeholder">Welcome <b>%s</b></string>
+    <string name="welcome_message_test">Welcome <b>User Whatever</b></string>
+    <string name="unknown_user">Unknown User</string>
+    <string name="title_sleep_timer">Sleep Timer</string>
+    <string name="description_sleep_timer">Offers the possibility to 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="title_share_location">Share Location</string>
+    <string name="share_location_notification_content">You are sharing your current location within the family</string>
+    <string name="share_location_no_sharings_in_progress">Currently nobody is sharing their location</string>
+    <string name="share_location_info_title_empty">You are currently not following anyone</string>
+    <string name="share_location_info_title">You are following %s</string>
+    <string name="share_location_info_location">Last Received Location = %f;%f</string>
+    <string name="share_location_info_altitude">Last received altitude = %.2f Meters</string>
+    <string name="share_location_info_speed">The last received velocity was %.2f m/s (%.1f km/h)</string>
+    <string name="share_location_info_timestamp">This update was received at: %s</string>
+    <string name="share_location_toggle_button">Share your location</string>
+    <string name="share_location_background_permission_rationale">In order to share your position also while in the background, please grant the always permission</string>
+    <string name="title_activity_settings">Settings</string>
+    <string name="title_flashlight">Flashlight</string>
+    <string name="flashlight_camera_rationale">In order to have access to the flashlight, you need to grant the Camera permission.</string>
+    <string name="flashlight_set_min_level">Activate flashlight on minimum brightness</string>
+    <string name="flashlight_set_med_level">Activate flashlight on medium brightness</string>
+    <string name="flashlight_set_max_level">Activate flashlight on maximum brightness</string>
+    <string name="title_settings">Settings</string>
+    <string name="pref_share_location_header">Share Location</string>
+    <string name="pref_share_location_freq_title">Location Update frequency</string>
+    <string name="pref_share_location_freq_summary">The minimum amount of seconds to wait between two location updates <b>Note:</b> The lower the value the higher the battery consumption</string>
+    <string name="pref_auto_accuracy_title">Automatic accuracy detection</string>
+    <string name="pref_auto_accuracy_summary_on">Accuracy will be auto selected based on the current charging state</string>
+    <string name="pref_auto_accuracy_summary_off">Select high accuracy vs. balanced power consumption below</string>
+    <string name="pref_manual_accuracy_title">Force high accuracy</string>
+    <string name="pref_manual_accuracy_summary_on">High accuracy for location data, may drain battery faster</string>
+    <string name="pref_manual_accuracy_summary_off">Lower accuracy for location data, but better battery consumption</string>
+</resources>

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

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <declare-styleable name="FlashLightLevelShifter">
+        <attr name="level_background_color" format="color" />
+        <attr name="level_corner_radius" format="dimension" />
+        <attr name="level_gap" format="dimension" />
+        <attr name="level_progress_color" format="color" />
+    </declare-styleable>
+</resources>

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

@@ -1,4 +1,44 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <dimen name="text_size_welcome_message">28sp</dimen>
+
+    <!-- activity_main -->
+    <dimen name="main_helper_group_item_margin">10dp</dimen>
+
+    <!-- helper_group_tile_item -->
+    <dimen name="helper_group_item_image_height">75dp</dimen>
+    <dimen name="helper_group_item_image_width">75dp</dimen>
+    <integer name="helper_group_item_title_max_lines">1</integer>
+
+    <!-- activity_share_location -->
+    <dimen name="share_location_active_share_container_height">75dp</dimen>
+    <dimen name="share_location_currently_following_picture_height">40dp</dimen>
+    <dimen name="share_location_currently_following_picture_width">40dp</dimen>
+
+    <!-- active_share_view_holder -->
+    <dimen name="active_share_view_holder_width">75dp</dimen>
+    <dimen name="active_share_view_holder_height">75dp</dimen>
+    <dimen name="active_share_profile_picture_width">50dp</dimen>
+    <dimen name="active_share_profile_picture_height">50dp</dimen>
+    <dimen name="active_share_profile_picture_border_width">2dp</dimen>
+    <dimen name="active_share_profile_name_text_size">11sp</dimen>
+
+    <!-- activity_flashlight -->
+    <dimen name="flashlight_header_image_width">250dp</dimen>
+    <dimen name="flashlight_level_shifter_width">112dp</dimen>
+    <dimen name="flashlight_level_shifter_margin_top">200dp</dimen>
+    <dimen name="flashlight_level_shifter_margin_end">50dp</dimen>
+    <dimen name="flashlight_level_shifter_corner_radius">8dp</dimen>
+    <dimen name="flashlight_level_shifter_level_gap">2dp</dimen>
+    <dimen name="flashlight_activity_margin_bottom">25dp</dimen>
+    <dimen name="flashlight_material_button_margin_start">20dp</dimen>
+    <dimen name="flashlight_material_button_margin_end">30dp</dimen>
+    <integer name="flashlight_material_button_lines">3</integer>
+    <integer name="flashlight_material_button_max_lines">3</integer>
+
+    <!-- root_preferences -->
+    <integer name="pref_location_update_freq_min">1</integer>
+    <integer name="pref_location_update_freq_max">60</integer>
+    <integer name="pref_location_update_freq_increment">1</integer>
+    <integer name="pref_location_update_freq_default">10</integer>
 </resources>

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

@@ -1,6 +1,5 @@
 <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>
 
     <!-- Global Strings -->
@@ -10,29 +9,36 @@
 
     <!-- Sleep Timer Functionality Strings -->
     <string name="title_sleep_timer">Sleep Timer</string>
-    <string name="sleep_timer_notification_channel">SleepTimer</string>
+    <string name="sleep_timer_notification_channel" translatable="false">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="description_sleep_timer">Offers the possibility to 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_with_hour" translatable="false">%02d:%02d:%02d"</string>
-    <string name="sleep_timer_remaining_time_without_hour">%02d:%02d"</string>
+    <string name="sleep_timer_remaining_time_without_hour" translatable="false">%02d:%02d"</string>
 
     <!-- Share Location Functionality Strings -->
     <string name="title_share_location">Share Location</string>
-    <string name="share_location_notification_channel">ShareLocation</string>
+    <string name="share_location_notification_channel" translatable="false">ShareLocation</string>
     <string name="share_location_notification_content">You are sharing your current location within the family</string>
     <string name="share_location_no_sharings_in_progress">Currently nobody is sharing their location</string>
     <string name="share_location_info_title_empty">You are currently not following anyone</string>
     <string name="share_location_info_title">You are following %s</string>
     <string name="share_location_info_location">Last Received Location = %f;%f</string>
-    <string name="share_location_info_altitude">Last received latitude = %.2f Meters</string>
+    <string name="share_location_info_altitude">Last received altitude = %.2f Meters</string>
     <string name="share_location_info_speed">The last received velocity was %.2f m/s (%.1f km/h)</string>
     <string name="share_location_info_timestamp">This update was received at: %s</string>
     <string name="share_location_toggle_button">Share your location</string>
     <string name="share_location_background_permission_rationale">In order to share your position also while in the background, please grant the always permission</string>
-    <string name="title_activity_settings">SettingsActivity</string>
+    <string name="title_activity_settings">Settings</string>
+
+    <!-- Flashlight Functionality Strings -->
+    <string name="title_flashlight">Flashlight</string>
+    <string name="flashlight_camera_rationale">In order to have access to the flashlight, you need to grant the Camera permission.</string>
+    <string name="flashlight_set_min_level">Activate flashlight on minimum brightness</string>
+    <string name="flashlight_set_med_level">Activate flashlight on medium brightness</string>
+    <string name="flashlight_set_max_level">Activate flashlight on maximum brightness</string>
 
     <!-- Settings -->
     <string name="title_settings">Settings</string>
@@ -40,7 +46,7 @@
     <!-- Share Location Preference -->
     <string name="pref_share_location_header">Share Location</string>
     <string name="pref_share_location_freq_title">Location Update frequency</string>
-    <string name="pref_share_location_freq_summary">The minimum amount of seconds to wait between two location updates\n<b>Note:</b> The lower the value the higher the battery consumption</string>
+    <string name="pref_share_location_freq_summary">The minimum amount of seconds to wait between two location updates <b>Note:</b> The lower the value the higher the battery consumption</string>
     <string name="pref_auto_accuracy_title">Automatic accuracy detection</string>
     <string name="pref_auto_accuracy_summary_on">Accuracy will be auto selected based on the current charging state</string>
     <string name="pref_auto_accuracy_summary_off">Select high accuracy vs. balanced power consumption below</string>

app/src/main/res/xml/root_preferences.xml

@@ -6,11 +6,11 @@
         <SeekBarPreference
             app:key="@string/pref_key_share_location_freq"
             app:title="@string/pref_share_location_freq_title"
-            app:min="1"
+            app:min="@integer/pref_location_update_freq_min"
-            android:max="60"
+            android:max="@integer/pref_location_update_freq_max"
-            app:seekBarIncrement="1"
+            app:seekBarIncrement="@integer/pref_location_update_freq_increment"
             app:showSeekBarValue="true"
-            app:defaultValue="10"
+            app:defaultValue="@integer/pref_location_update_freq_default"
             app:summary="@string/pref_share_location_freq_summary"/>
 
         <SwitchPreferenceCompat