Add app:facing

Change-Id: I6446e9bfe231a9ba5857b996a204263112f1a86e

demo/src/main/res/layout-land/activity_main.xml

@@ -24,6 +24,7 @@
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
         android:adjustViewBounds="true"
-        app:focusMode="continuousPicture"/>
+        app:focusMode="continuousPicture"
+        app:facing="back"/>
 
 </FrameLayout>

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

@@ -24,6 +24,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:adjustViewBounds="true"
-        app:focusMode="continuousPicture"/>
+        app:focusMode="continuousPicture"
+        app:facing="back"/>
 
 </FrameLayout>

library/src/androidTest/java/com/google/android/cameraview/CameraViewTest.java

@@ -95,21 +95,9 @@ public void testSetup() {
     @Test
     @FlakyTest
     public void preview_isShowing() throws Exception {
-        onView(withId(R.id.texture_view))
-                .perform(new WaitAction(1000))
-                .check(new ViewAssertion() {
-                    @Override
-                    public void check(View view, NoMatchingViewException noViewFoundException) {
-                        TextureView textureView = (TextureView) view;
-                        Bitmap bitmap = textureView.getBitmap();
-                        int topLeft = bitmap.getPixel(0, 0);
-                        int center = bitmap.getPixel(bitmap.getWidth() / 2, bitmap.getHeight() / 2);
-                        int bottomRight = bitmap.getPixel(
-                                bitmap.getWidth() - 1, bitmap.getHeight() - 1);
-                        assertFalse("Preview possibly blank: " + Integer.toHexString(topLeft),
-                                topLeft == center && center == bottomRight);
-                    }
-                });
+        onView(withId(R.id.camera))
+                .perform(waitFor(1000))
+                .check(showingPreview());
     }
 
     @Test
@@ -219,6 +207,48 @@ public void check(View view, NoMatchingViewException noViewFoundException) {
                 });
     }
 
+    @Test
+    public void testFacing() {
+        onView(withId(R.id.camera))
+                .check(new ViewAssertion() {
+                    @Override
+                    public void check(View view, NoMatchingViewException noViewFoundException) {
+                        CameraView cameraView = (CameraView) view;
+                        assertThat(cameraView.getFacing(), is(CameraView.FACING_BACK));
+                        cameraView.setFacing(CameraView.FACING_FRONT);
+                        assertThat(cameraView.getFacing(), is(CameraView.FACING_FRONT));
+                    }
+                })
+                .perform(waitFor(1000))
+                .check(showingPreview());
+    }
+
+    private static ViewAction waitFor(final long ms) {
+        return new AnythingAction("wait") {
+            @Override
+            public void perform(UiController uiController, View view) {
+                SystemClock.sleep(ms);
+            }
+        };
+    }
+
+    private static ViewAssertion showingPreview() {
+        return new ViewAssertion() {
+            @Override
+            public void check(View view, NoMatchingViewException noViewFoundException) {
+                CameraView cameraView = (CameraView) view;
+                TextureView textureView = (TextureView) cameraView.findViewById(R.id.texture_view);
+                Bitmap bitmap = textureView.getBitmap();
+                int topLeft = bitmap.getPixel(0, 0);
+                int center = bitmap.getPixel(bitmap.getWidth() / 2, bitmap.getHeight() / 2);
+                int bottomRight = bitmap.getPixel(
+                        bitmap.getWidth() - 1, bitmap.getHeight() - 1);
+                assertFalse("Preview possibly blank: " + Integer.toHexString(topLeft),
+                        topLeft == center && center == bottomRight);
+            }
+        };
+    }
+
     /**
      * Wait for a camera to open.
      */
@@ -277,22 +307,6 @@ public void registerIdleTransitionCallback(ResourceCallback callback) {
 
     }
 
-    private static class WaitAction extends AnythingAction {
-
-        private final long mMs;
-
-        public WaitAction(long ms) {
-            super("wait");
-            mMs = ms;
-        }
-
-        @Override
-        public void perform(UiController uiController, View view) {
-            SystemClock.sleep(mMs);
-        }
-
-    }
-
     private static abstract class AnythingAction implements ViewAction {
 
         private final String mDescription;
@@ -310,6 +324,7 @@ public Matcher<View> getConstraints() {
         public String getDescription() {
             return mDescription;
         }
+
     }
 
 }

library/src/main/base/com/google/android/cameraview/CameraViewImpl.java

@@ -46,6 +46,10 @@ public CameraViewImpl(Callback callback) {
 
     abstract int getFocusMode();
 
+    abstract void setFacing(int facing);
+
+    abstract int getFacing();
+
     interface Callback {
 
         void onCameraOpened();

library/src/main/base/com/google/android/cameraview/Constants.java

@@ -26,4 +26,8 @@ interface Constants {
     int FOCUS_MODE_CONTINUOUS_VIDEO = 4;
     int FOCUS_MODE_EDOF = 5;
 
+    int FACING_BACK = 0;
+    int FACING_FRONT = 1;
+    int FACING_EXTERNAL = 2;
+
 }

library/src/main/camera1/com/google/android/cameraview/Camera1.java

@@ -34,6 +34,8 @@ class Camera1 extends CameraViewImpl {
 
     private static final AspectRatio DEFAULT_ASPECT_RATIO = AspectRatio.of(4, 3);
 
+    private static final String TAG = "Camera1";
+
     private final Context mContext;
 
     private int mCameraId;
@@ -56,6 +58,8 @@ class Camera1 extends CameraViewImpl {
 
     private int mFocusMode;
 
+    private int mFacing;
+
     private static class PreviewInfo {
         SurfaceTexture surface;
         int width;
@@ -190,14 +194,29 @@ int getFocusMode() {
         return mFocusMode;
     }
 
+    @Override
+    void setFacing(int facing) {
+        if (mFacing != facing) {
+            mFacing = facing;
+            if (mCamera != null) {
+                stop();
+                start();
+            }
+        }
+    }
+
+    @Override
+    int getFacing() {
+        return mFacing;
+    }
+
     /**
      * This rewrites {@link #mCameraId} and {@link #mCameraInfo}.
      */
     private void chooseCamera() {
         for (int i = 0, count = Camera.getNumberOfCameras(); i < count; i++) {
             Camera.getCameraInfo(i, mCameraInfo);
-            // TODO: Just choose the back-facing camera for now
-            if (mCameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
+            if (mCameraInfo.facing == mFacing) {
                 mCameraId = i;
                 return;
             }

library/src/main/camera1/com/google/android/cameraview/Camera1Constants.java

@@ -28,7 +28,7 @@ class Camera1Constants {
     static String convertFocusMode(int focusMode) {
         if (sFocusModesMap == null) {
             sFocusModesMap = new SparseArrayCompat<>();
-            sFocusModesMap.put(Constants.FOCUS_MODE_OFF, Camera.Parameters.FOCUS_MODE_FIXED);
+            sFocusModesMap.put(Constants.FOCUS_MODE_OFF, Camera.Parameters.FOCUS_MODE_INFINITY);
             sFocusModesMap.put(Constants.FOCUS_MODE_AUTO, Camera.Parameters.FOCUS_MODE_AUTO);
             sFocusModesMap.put(Constants.FOCUS_MODE_MACRO, Camera.Parameters.FOCUS_MODE_MACRO);
             sFocusModesMap.put(Constants.FOCUS_MODE_CONTINUOUS_PICTURE,

library/src/main/java/com/google/android/cameraview/CameraView.java

@@ -46,6 +46,15 @@ public class CameraView extends FrameLayout {
     public @interface FocusMode {
     }
 
+    public static final int FACING_BACK = Constants.FACING_BACK;
+    public static final int FACING_FRONT = Constants.FACING_FRONT;
+    public static final int FACING_EXTERNAL = Constants.FACING_EXTERNAL;
+
+    @IntDef({FACING_BACK, FACING_FRONT, FACING_EXTERNAL})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface Facing {
+    }
+
     private final CameraViewImpl mImpl;
 
     private final CallbackBridge mCallbacks;
@@ -62,6 +71,7 @@ public CameraView(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
     }
 
+    @SuppressWarnings("WrongConstant")
     public CameraView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
         // Internal setup
@@ -79,8 +89,8 @@ public CameraView(Context context, AttributeSet attrs, int defStyleAttr) {
         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CameraView, defStyleAttr,
                 R.style.Widget_CameraView);
         mAdjustViewBounds = a.getBoolean(R.styleable.CameraView_android_adjustViewBounds, false);
-        //noinspection WrongConstant
         setFocusMode(a.getInt(R.styleable.CameraView_focusMode, FOCUS_MODE_OFF));
+        setFacing(a.getInt(R.styleable.CameraView_facing, FACING_BACK));
         a.recycle();
     }
 
@@ -251,6 +261,27 @@ public int getFocusMode() {
         return mImpl.getFocusMode();
     }
 
+    /**
+     * Chooses camera by the direction it faces.
+     *
+     * @param facing The camera facing. Must be one of {@link #FACING_BACK},
+     *               {@link #FACING_FRONT}, and {@link #FACING_EXTERNAL}
+     */
+    public void setFacing(@Facing int facing) {
+        mImpl.setFacing(facing);
+    }
+
+    /**
+     * Gets the direction that the current camera faces.
+     *
+     * @return The camera facing.
+     */
+    @Facing
+    public int getFacing() {
+        //noinspection WrongConstant
+        return mImpl.getFacing();
+    }
+
     private class CallbackBridge implements CameraViewImpl.Callback {
 
         private final ArrayList<Callback> mCallbacks = new ArrayList<>();

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

@@ -22,5 +22,10 @@
             <enum name="continuousVideo" value="4"/>
             <enum name="edof" value="5"/>
         </attr>
+        <attr name="facing" format="enum">
+            <enum name="back" value="0"/>
+            <enum name="front" value="1"/>
+            <enum name="external" value="2"/>
+        </attr>
     </declare-styleable>
 </resources>

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

@@ -16,6 +16,7 @@
     <style name="Widget.CameraView" parent="android:Widget">
         <item name="android:adjustViewBounds">false</item>
         <item name="focusMode">off</item>
+        <item name="facing">back</item>
     </style>
 
 </resources>