Add methods for managing subtitle overlays in VideoView (de213f70) · Commits · e / os / android_frameworks_base

core/java/android/widget/VideoView.java

+108 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,7 @@ import android.content.Context;
		import android.content.DialogInterface;
		import android.content.Intent;
		import android.content.res.Resources;
		import android.graphics.Canvas;
		import android.media.AudioManager;
		import android.media.MediaFormat;
		import android.media.MediaPlayer;
		@@ -42,6 +43,7 @@ import android.widget.MediaController.MediaPlayerControl;

		import java.io.IOException;
		import java.io.InputStream;
		import java.util.ArrayList;
		import java.util.Map;
		import java.util.Vector;

		@@ -94,6 +96,15 @@ public class VideoView extends SurfaceView implements MediaPlayerControl {
		private boolean mCanSeekBack;
		private boolean mCanSeekForward;

		/** List of views overlaid on top of the video. */
		private ArrayList<View> mOverlays;

		/**
		* Listener for overlay layout changes. Invalidates the video view to ensure
		* that captions are redrawn whenever their layout changes.
		*/
		private OnLayoutChangeListener mOverlayLayoutListener;

		public VideoView(Context context) {
		super(context);
		initVideoView();
		@@ -766,4 +777,101 @@ public class VideoView extends SurfaceView implements MediaPlayerControl {
		}
		return mAudioSession;
		}

		@Override
		protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
		super.onLayout(changed, left, top, right, bottom);

		// Layout overlay views, if necessary.
		if (changed && mOverlays != null && !mOverlays.isEmpty()) {
		measureAndLayoutOverlays();
		}
		}

		@Override
		public void draw(Canvas canvas) {
		super.draw(canvas);

		final int count = mOverlays.size();
		for (int i = 0; i < count; i++) {
		final View overlay = mOverlays.get(i);
		overlay.draw(canvas);
		}
		}

		/**
		* Adds a view to be overlaid on top of this video view. During layout, the
		* view will be forced to match the bounds, less padding, of the video view.
		* <p>
		* Overlays are drawn in the order they are added. The last added overlay
		* will be drawn on top.
		*
		* @param overlay the view to overlay
		* @see #removeOverlay(View)
		*/
		private void addOverlay(View overlay) {
		if (mOverlays == null) {
		mOverlays = new ArrayList<View>(1);
		}

		if (mOverlayLayoutListener == null) {
		mOverlayLayoutListener = new OnLayoutChangeListener() {
		@Override
		public void onLayoutChange(View v, int left, int top, int right, int bottom,
		int oldLeft, int oldTop, int oldRight, int oldBottom) {
		invalidate();
		}
		};
		}

		if (mOverlays.isEmpty()) {
		setWillNotDraw(false);
		}

		mOverlays.add(overlay);
		overlay.addOnLayoutChangeListener(mOverlayLayoutListener);
		measureAndLayoutOverlays();
		}

		/**
		* Removes a view previously added using {@link #addOverlay}.
		*
		* @param overlay the view to remove
		* @see #addOverlay(View)
		*/
		private void removeOverlay(View overlay) {
		if (mOverlays == null) {
		return;
		}

		overlay.removeOnLayoutChangeListener(mOverlayLayoutListener);
		mOverlays.remove(overlay);

		if (mOverlays.isEmpty()) {
		setWillNotDraw(true);
		}

		invalidate();
		}

		/**
		* Forces a measurement and layout pass for all overlaid views.
		*
		* @see #addOverlay(View)
		*/
		private void measureAndLayoutOverlays() {
		final int left = getPaddingLeft();
		final int top = getPaddingTop();
		final int right = getWidth() - left - getPaddingRight();
		final int bottom = getHeight() - top - getPaddingBottom();
		final int widthSpec = MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY);
		final int heightSpec = MeasureSpec.makeMeasureSpec(bottom - top, MeasureSpec.EXACTLY);

		final int count = mOverlays.size();
		for (int i = 0; i < count; i++) {
		final View overlay = mOverlays.get(i);
		overlay.measure(widthSpec, heightSpec);
		overlay.layout(left, top, right, bottom);
		}
		}
		}