Brighten camera screen if under 66%.

app/src/main/java/org/thoughtcrime/securesms/mediasend/Camera1Fragment.java

@@ -70,17 +70,18 @@ public class Camera1Fragment extends LoggingFragment implements CameraFragment,
 
   private static final String TAG = Log.tag(Camera1Fragment.class);
 
-  private TextureView                  cameraPreview;
-  private ViewGroup                    controlsContainer;
-  private ImageButton                  flipButton;
-  private View                         captureButton;
-  private Camera1Controller            camera;
-  private Controller                   controller;
-  private OrderEnforcer<Stage>         orderEnforcer;
-  private Camera1Controller.Properties properties;
-  private RotationListener             rotationListener;
-  private Disposable                   rotationListenerDisposable;
-  private Disposable                   mostRecentItemDisposable = Disposable.disposed();
+  private TextureView                      cameraPreview;
+  private ViewGroup                        controlsContainer;
+  private ImageButton                      flipButton;
+  private View                             captureButton;
+  private Camera1Controller                camera;
+  private Controller                       controller;
+  private OrderEnforcer<Stage>             orderEnforcer;
+  private Camera1Controller.Properties     properties;
+  private RotationListener                 rotationListener;
+  private Disposable                       rotationListenerDisposable;
+  private Disposable                       mostRecentItemDisposable = Disposable.disposed();
+  private CameraScreenBrightnessController cameraScreenBrightnessController;
 
   private boolean isThumbAvailable;
   private boolean isMediaSelected;
@@ -124,6 +125,8 @@ public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup c
   public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
     super.onViewCreated(view, savedInstanceState);
     requireActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
+    cameraScreenBrightnessController = new CameraScreenBrightnessController(requireActivity().getWindow());
+    getViewLifecycleOwner().getLifecycle().addObserver(cameraScreenBrightnessController);
 
     rotationListener  = new RotationListener(requireContext());
     cameraPreview     = view.findViewById(R.id.camera_preview);

app/src/main/java/org/thoughtcrime/securesms/mediasend/CameraScreenBrightnessController.kt

@@ -0,0 +1,35 @@
+package org.thoughtcrime.securesms.mediasend
+
+import android.view.Window
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+
+/**
+ * Modifies screen brightness to increase to a max of 66% if lower than that for optimal picture
+ * taking conditions.
+ */
+class CameraScreenBrightnessController(private val window: Window) : DefaultLifecycleObserver {
+
+  companion object {
+    private const val MIN_CAMERA_BRIGHTNESS = 0.66f
+  }
+
+  private var originalBrightness: Float = 0f
+
+  override fun onResume(owner: LifecycleOwner) {
+    val originalBrightness = window.attributes.screenBrightness
+    if (originalBrightness < MIN_CAMERA_BRIGHTNESS) {
+      window.attributes = window.attributes.apply {
+        screenBrightness = MIN_CAMERA_BRIGHTNESS
+      }
+    }
+  }
+
+  override fun onPause(owner: LifecycleOwner) {
+    if (originalBrightness > 0f && window.attributes.screenBrightness == MIN_CAMERA_BRIGHTNESS) {
+      window.attributes = window.attributes.apply {
+        screenBrightness = originalBrightness
+      }
+    }
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/mediasend/CameraXFragment.java

@@ -25,7 +25,10 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
+import androidx.camera.core.CameraInfo;
 import androidx.camera.core.CameraSelector;
+import androidx.camera.core.ExposureState;
+import androidx.camera.core.FocusMeteringAction;
 import androidx.camera.core.ImageCapture;
 import androidx.camera.core.ImageCaptureException;
 import androidx.camera.core.ImageProxy;
@@ -81,14 +84,15 @@ public class CameraXFragment extends LoggingFragment implements CameraFragment {
   private static final Rational              ASPECT_RATIO_16_9  = new Rational(16, 9);
   private static final PreviewView.ScaleType PREVIEW_SCALE_TYPE = PreviewView.ScaleType.FILL_CENTER;
 
-  private PreviewView               previewView;
-  private ViewGroup                 controlsContainer;
-  private Controller                controller;
-  private View                      selfieFlash;
-  private MemoryFileDescriptor      videoFileDescriptor;
-  private LifecycleCameraController cameraController;
-  private Disposable                mostRecentItemDisposable = Disposable.disposed();
-  private CameraXModePolicy         cameraXModePolicy;
+  private PreviewView                      previewView;
+  private ViewGroup                        controlsContainer;
+  private Controller                       controller;
+  private View                             selfieFlash;
+  private MemoryFileDescriptor             videoFileDescriptor;
+  private LifecycleCameraController        cameraController;
+  private Disposable                       mostRecentItemDisposable = Disposable.disposed();
+  private CameraXModePolicy                cameraXModePolicy;
+  private CameraScreenBrightnessController cameraScreenBrightnessController;
 
   private boolean isThumbAvailable;
   private boolean isMediaSelected;
@@ -134,6 +138,9 @@ public void onAttach(@NonNull Context context) {
   @SuppressLint("MissingPermission")
   @Override
   public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+    cameraScreenBrightnessController = new CameraScreenBrightnessController(requireActivity().getWindow());
+    getViewLifecycleOwner().getLifecycle().addObserver(cameraScreenBrightnessController);
+
     ViewGroup cameraParent = view.findViewById(R.id.camerax_camera_parent);
 
     this.previewView       = view.findViewById(R.id.camerax_camera);