Change Camera2Sample behavior to react on MediaStore intents for capt…

Camera2Sample/app/src/main/AndroidManifest.xml

@@ -55,6 +55,22 @@
         -->
         <category android:name="com.google.android.glass.category.DIRECTORY"/>
       </intent-filter>
+      <intent-filter>
+        <action android:name="android.media.action.IMAGE_CAPTURE" />
+        <category android:name="android.intent.category.DEFAULT" />
+      </intent-filter>
+      <intent-filter>
+        <action android:name="android.media.action.VIDEO_CAPTURE" />
+        <category android:name="android.intent.category.DEFAULT" />
+      </intent-filter>
+      <intent-filter>
+        <action android:name="android.media.action.STILL_IMAGE_CAMERA" />
+        <category android:name="android.intent.category.DEFAULT" />
+      </intent-filter>
+      <intent-filter>
+        <action android:name="android.media.action.VIDEO_CAMERA" />
+        <category android:name="android.intent.category.DEFAULT" />
+      </intent-filter>
     </activity>
   </application>
 

Camera2Sample/app/src/main/java/com/example/glass/camera2sample/CameraActionHandler.java

@@ -18,6 +18,7 @@
 
 import android.annotation.SuppressLint;
 import android.content.Context;
+import android.content.Intent;
 import android.hardware.camera2.CameraAccessException;
 import android.hardware.camera2.CameraCaptureSession;
 import android.hardware.camera2.CameraCaptureSession.CaptureCallback;
@@ -30,6 +31,7 @@
 import android.hardware.camera2.params.StreamConfigurationMap;
 import android.media.ImageReader;
 import android.media.ImageReader.OnImageAvailableListener;
+import android.provider.MediaStore;
 import android.support.annotation.NonNull;
 import android.util.Log;
 import android.view.Surface;
@@ -355,6 +357,26 @@ public void setPreviewSurface(Surface previewSurface) {
     this.previewSurface = previewSurface;
   }
 
+  /**
+   * Handles given {@link Intent} and sets appropriate {@link CameraMode} depends on the intent
+   * action.
+   */
+  public void handleIntent(Intent intent) {
+    final String intentAction = intent.getAction();
+    if (intentAction != null) {
+      switch (intentAction) {
+        case MediaStore.ACTION_IMAGE_CAPTURE:
+        case MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA:
+          switchCameraMode(CameraMode.PICTURE);
+          break;
+        case MediaStore.INTENT_ACTION_VIDEO_CAMERA:
+        case MediaStore.ACTION_VIDEO_CAPTURE:
+          switchCameraMode(CameraMode.VIDEO);
+          break;
+      }
+    }
+  }
+
   /**
    * Switches {@link CameraMode} states. Possible scenarios:
    * <ol>

Camera2Sample/app/src/main/java/com/example/glass/camera2sample/CameraFragment.java

@@ -137,6 +137,7 @@ public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceStat
   public void onActivityCreated(@Nullable Bundle savedInstanceState) {
     super.onActivityCreated(savedInstanceState);
     cameraActionHandler = new CameraActionHandler(getContext(), this);
+    cameraActionHandler.handleIntent(Objects.requireNonNull(getActivity()).getIntent());
   }
 
   @Override