let the quick camera remember front/back mode

fixes #4438
closes #4440

//FREEBIE

src/org/thoughtcrime/securesms/components/camera/CameraView.java

@@ -40,6 +40,7 @@ import java.util.List;
 
 import org.thoughtcrime.securesms.ApplicationContext;
 import org.thoughtcrime.securesms.util.BitmapUtil;
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
 import org.thoughtcrime.securesms.util.Util;
 import org.whispersystems.jobqueue.Job;
 import org.whispersystems.jobqueue.JobParameters;
@@ -72,7 +73,7 @@ public class CameraView extends FrameLayout {
     super(context, attrs, defStyle);
     setBackgroundColor(Color.BLACK);
 
-    if (isMultiCamera()) cameraId = CameraInfo.CAMERA_FACING_FRONT;
+    if (isMultiCamera()) cameraId = TextSecurePreferences.getDirectCaptureCameraId(context);
 
     surface             = new CameraSurfaceView(getContext());
     onOrientationChange = new OnOrientationChange(context.getApplicationContext());
@@ -238,6 +239,7 @@ public class CameraView extends FrameLayout {
                  : CameraInfo.CAMERA_FACING_BACK;
       onPause();
       onResume();
+      TextSecurePreferences.setDirectCaptureCameraId(getContext(), cameraId);
     }
   }
 

src/org/thoughtcrime/securesms/components/camera/QuickAttachmentDrawer.java

@@ -125,6 +125,8 @@ public class QuickAttachmentDrawer extends ViewGroup implements InputView {
     fullScreenButton = (ImageButton) controls.findViewById(R.id.fullscreen_button);
     if (cameraView.isMultiCamera()) {
       swapCameraButton.setVisibility(View.VISIBLE);
+      swapCameraButton.setImageResource(cameraView.isRearCamera() ? R.drawable.quick_camera_front
+                                                                  : R.drawable.quick_camera_rear);
       swapCameraButton.setOnClickListener(new CameraFlipClickListener());
     }
     shutterButton.setOnClickListener(new ShutterClickListener());

src/org/thoughtcrime/securesms/util/TextSecurePreferences.java

@@ -2,6 +2,7 @@ package org.thoughtcrime.securesms.util;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.hardware.Camera.CameraInfo;
 import android.os.Build;
 import android.preference.PreferenceManager;
 import android.provider.Settings;
@@ -92,6 +93,16 @@ public class TextSecurePreferences {
 
   public  static final String SYSTEM_EMOJI_PREF                = "pref_system_emoji";
   private static final String MULTI_DEVICE_PROVISIONED_PREF    = "pref_multi_device";
+  public  static final String DIRECT_CAPTURE_CAMERA_ID         = "pref_direct_capture_camera_id";
+
+  public static void setDirectCaptureCameraId(Context context, int value) {
+    setIntegerPrefrence(context, DIRECT_CAPTURE_CAMERA_ID, value);
+  }
+
+  @SuppressWarnings("deprecation")
+  public static int getDirectCaptureCameraId(Context context) {
+    return getIntegerPreference(context, DIRECT_CAPTURE_CAMERA_ID, CameraInfo.CAMERA_FACING_FRONT);
+  }
 
   public static void setMultiDevice(Context context, boolean value) {
     setBooleanPreference(context, MULTI_DEVICE_PROVISIONED_PREF, value);