Java tutorial
/* * Copyright (c) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.aengbee.android.leanback.ui; import android.annotation.TargetApi; import android.app.Activity; import android.app.LoaderManager; import android.app.PendingIntent; import android.content.Context; import android.content.CursorLoader; import android.content.Intent; import android.content.Loader; import android.content.res.Resources; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.SurfaceTexture; import android.media.AudioManager; import android.media.session.MediaController; import android.media.session.PlaybackState; import android.net.Uri; import android.os.Build.VERSION_CODES; import android.os.Bundle; import android.os.RemoteException; import android.support.v17.leanback.widget.ArrayObjectAdapter; import android.support.v17.leanback.widget.ClassPresenterSelector; import android.support.v17.leanback.widget.CursorObjectAdapter; import android.support.v17.leanback.widget.HeaderItem; import android.support.v17.leanback.widget.ImageCardView; import android.support.v17.leanback.widget.ListRow; import android.support.v17.leanback.widget.ListRowPresenter; import android.support.v17.leanback.widget.OnItemViewClickedListener; import android.support.v17.leanback.widget.PlaybackControlsRow; import android.support.v17.leanback.widget.PlaybackControlsRowPresenter; import android.support.v17.leanback.widget.Presenter; import android.support.v17.leanback.widget.Row; import android.support.v17.leanback.widget.RowPresenter; import android.support.v4.app.ActivityOptionsCompat; import android.support.v4.app.FragmentActivity; import android.support.v4.media.MediaDescriptionCompat; import android.support.v4.media.MediaMetadataCompat; import android.support.v4.media.session.MediaControllerCompat; import android.support.v4.media.session.MediaSessionCompat; import android.support.v4.media.session.PlaybackStateCompat; import android.util.Log; import android.view.Surface; import android.view.TextureView; import com.aengbee.android.leanback.R; import com.aengbee.android.leanback.data.VideoContract; import com.aengbee.android.leanback.model.Video; import com.aengbee.android.leanback.model.VideoCursorMapper; import com.aengbee.android.leanback.player.ExtractorRendererBuilder; import com.aengbee.android.leanback.player.VideoPlayer; import com.aengbee.android.leanback.presenter.CardPresenter; import com.aengbee.android.leanback.utils.Utils; import com.bumptech.glide.Glide; import com.bumptech.glide.request.animation.GlideAnimation; import com.bumptech.glide.request.target.SimpleTarget; import com.google.android.exoplayer.ExoPlayer; import com.google.android.exoplayer.util.Util; import java.util.ArrayList; import java.util.List; import static android.support.v4.media.session.MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS; import static android.support.v4.media.session.MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS; /* * The PlaybackOverlayFragment class handles the Fragment associated with displaying the UI for the * media controls such as play / pause / skip forward / skip backward etc. * * The UI is updated through events that it receives from its MediaController */ public class PlaybackOverlayFragment_WebView extends android.support.v17.leanback.app.PlaybackOverlayFragment implements LoaderManager.LoaderCallbacks<Cursor>, TextureView.SurfaceTextureListener, VideoPlayer.Listener { private static final String TAG = "PlaybackOverlayFragment"; private static final int BACKGROUND_TYPE = PlaybackOverlayFragment_WebView.BG_LIGHT; private static final String AUTO_PLAY = "auto_play"; private static final Bundle mAutoPlayExtras = new Bundle(); private static final int RECOMMENDED_VIDEOS_LOADER = 1; private static final int QUEUE_VIDEOS_LOADER = 2; static { mAutoPlayExtras.putBoolean(AUTO_PLAY, true); } private final VideoCursorMapper mVideoCursorMapper = new VideoCursorMapper(); private int mSpecificVideoLoaderId = 3; private int mQueueIndex = -1; private Video mSelectedVideo; // Video is the currently playing Video and its metadata. private ArrayObjectAdapter mRowsAdapter; private List<MediaSessionCompat.QueueItem> mQueue = new ArrayList<>(); private CursorObjectAdapter mVideoCursorAdapter; private MediaSessionCompat mSession; // MediaSession is used to hold the state of our media playback. private LoaderManager.LoaderCallbacks<Cursor> mCallbacks; private MediaController mMediaController; private PlaybackControlHelper mGlue; private MediaController.Callback mMediaControllerCallback; private VideoPlayer mPlayer; private boolean mIsMetadataSet = false; private AudioManager mAudioManager; private boolean mHasAudioFocus; private boolean mPauseTransient; private final AudioManager.OnAudioFocusChangeListener mOnAudioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() { @Override public void onAudioFocusChange(int focusChange) { switch (focusChange) { case AudioManager.AUDIOFOCUS_LOSS: abandonAudioFocus(); pause(); break; case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT: if (mGlue.isMediaPlaying()) { pause(); mPauseTransient = true; } break; case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK: mPlayer.mute(true); break; case AudioManager.AUDIOFOCUS_GAIN: case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT: case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK: if (mPauseTransient) { play(); } mPlayer.mute(false); break; } } }; @Override public void onAttach(Context context) { super.onAttach(context); mCallbacks = this; createMediaSession(); } @Override public void onStop() { super.onStop(); mSession.release(); releasePlayer(); } @Override public void onDestroy() { super.onDestroy(); if (mMediaController != null) { mMediaController.unregisterCallback(mMediaControllerCallback); } mSession.release(); releasePlayer(); } @Override public void onStart() { super.onStart(); // Set up UI Video video = getActivity().getIntent().getParcelableExtra(VideoDetailsActivity.VIDEO); if (!updateSelectedVideo(video)) { return; } //mGlue = new PlaybackControlHelper(getActivity(), this, mSelectedVideo); PlaybackControlsRowPresenter controlsRowPresenter = mGlue.createControlsRowAndPresenter(); PlaybackControlsRow controlsRow = mGlue.getControlsRow(); mMediaControllerCallback = mGlue.createMediaControllerCallback(); mMediaController = getActivity().getMediaController(); mMediaController.registerCallback(mMediaControllerCallback); ClassPresenterSelector ps = new ClassPresenterSelector(); ps.addClassPresenter(PlaybackControlsRow.class, controlsRowPresenter); ps.addClassPresenter(ListRow.class, new ListRowPresenter()); mRowsAdapter = new ArrayObjectAdapter(ps); mRowsAdapter.add(controlsRow); addOtherRows(); updatePlaybackRow(); setAdapter(mRowsAdapter); startPlaying(); } @Override public void onResume() { super.onResume(); Video video = getActivity().getIntent().getParcelableExtra(VideoDetailsActivity.VIDEO); if (!updateSelectedVideo(video)) { return; } startPlaying(); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mAudioManager = (AudioManager) getActivity().getSystemService(Context.AUDIO_SERVICE); // Initialize instance variables. TextureView textureView = (TextureView) getActivity().findViewById(R.id.texture_view); textureView.setSurfaceTextureListener(this); setBackgroundType(BACKGROUND_TYPE); // Set up listener. setOnItemViewClickedListener(new ItemViewClickedListener()); } private boolean updateSelectedVideo(Video video) { Intent intent = new Intent(getActivity().getIntent()); intent.putExtra(VideoDetailsActivity.VIDEO, video); if (mSelectedVideo != null && mSelectedVideo.equals(video)) { return false; } mSelectedVideo = video; PendingIntent pi = PendingIntent.getActivity(getActivity(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); mSession.setSessionActivity(pi); return true; } @TargetApi(VERSION_CODES.N) @Override public void onPause() { super.onPause(); if (mGlue.isMediaPlaying()) { boolean isVisibleBehind = getActivity().requestVisibleBehind(true); boolean isInPictureInPictureMode = PlaybackOverlayActivity.supportsPictureInPicture(getActivity()) && getActivity().isInPictureInPictureMode(); if (!isVisibleBehind && !isInPictureInPictureMode) { pause(); } } else { getActivity().requestVisibleBehind(false); } } @Override public void onPictureInPictureModeChanged(boolean pictureInPictureMode) { if (pictureInPictureMode) { mGlue.setFadingEnabled(false); setFadingEnabled(true); fadeOut(); } else { mGlue.setFadingEnabled(true); } } @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) { switch (id) { case RECOMMENDED_VIDEOS_LOADER: // Fall through. case QUEUE_VIDEOS_LOADER: { String category = args.getString(VideoContract.VideoEntry.COLUMN_CATEGORY); return new CursorLoader(getActivity(), VideoContract.VideoEntry.CONTENT_URI, null, // Projection to return - null means return all fields. VideoContract.VideoEntry.COLUMN_CATEGORY + " = ?", // Selection clause is category. new String[] { category }, // Select based on the category. null // Default sort order ); } default: { // Loading a specific video. String videoId = args.getString(VideoContract.VideoEntry._ID); return new CursorLoader(getActivity(), VideoContract.VideoEntry.CONTENT_URI, null, // Projection to return - null means return all fields. VideoContract.VideoEntry._ID + " = ?", // Selection clause is id. new String[] { videoId }, // Select based on the id. null // Default sort order ); } } } @Override public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) { if (cursor != null && cursor.moveToFirst()) { switch (loader.getId()) { case QUEUE_VIDEOS_LOADER: { mQueue.clear(); while (!cursor.isAfterLast()) { Video v = (Video) mVideoCursorMapper.convert(cursor); // Set the queue index to the selected video. if (v.id == mSelectedVideo.id) { mQueueIndex = mQueue.size(); } // Add the video to the queue. MediaSessionCompat.QueueItem item = getQueueItem(v); mQueue.add(item); cursor.moveToNext(); } mSession.setQueue(mQueue); mSession.setQueueTitle(getString(R.string.queue_name)); break; } case RECOMMENDED_VIDEOS_LOADER: { mVideoCursorAdapter.changeCursor(cursor); break; } default: { // Playing a specific video. Video video = (Video) mVideoCursorMapper.convert(cursor); playVideo(video, mAutoPlayExtras); break; } } } } @Override public void onLoaderReset(Loader<Cursor> loader) { mVideoCursorAdapter.changeCursor(null); } private void setPosition(long position) { if (position > mPlayer.getDuration()) { mPlayer.seekTo(mPlayer.getDuration()); } else if (position < 0) { mPlayer.seekTo(0L); } else { mPlayer.seekTo(position); } } private void createMediaSession() { if (mSession == null) { mSession = new MediaSessionCompat(getActivity(), "LeanbackSampleApp"); mSession.setCallback(new MediaSessionCallback()); mSession.setFlags(FLAG_HANDLES_MEDIA_BUTTONS | FLAG_HANDLES_TRANSPORT_CONTROLS); mSession.setActive(true); // Set the Activity's MediaController used to invoke transport controls / adjust volume. try { ((FragmentActivity) getActivity()).setSupportMediaController( new MediaControllerCompat(getActivity(), mSession.getSessionToken())); setPlaybackState(PlaybackState.STATE_NONE); } catch (RemoteException e) { e.printStackTrace(); } } } private MediaSessionCompat.QueueItem getQueueItem(Video v) { MediaDescriptionCompat desc = new MediaDescriptionCompat.Builder().setDescription(v.description) .setMediaId(v.id + "").setIconUri(Uri.parse(v.cardImageUrl)).setMediaUri(Uri.parse(v.videoUrl)) .setSubtitle(v.studio).setTitle(v.title).build(); return new MediaSessionCompat.QueueItem(desc, v.id); } public long getBufferedPosition() { if (mPlayer != null) { return mPlayer.getBufferedPosition(); } return 0L; } public long getCurrentPosition() { if (mPlayer != null) { return mPlayer.getCurrentPosition(); } return 0L; } public long getDuration() { if (mPlayer != null) { return mPlayer.getDuration(); } return ExoPlayer.UNKNOWN_TIME; } private long getAvailableActions(int nextState) { long actions = PlaybackState.ACTION_PLAY | PlaybackState.ACTION_PLAY_FROM_MEDIA_ID | PlaybackState.ACTION_PLAY_FROM_SEARCH | PlaybackState.ACTION_SKIP_TO_NEXT | PlaybackState.ACTION_SKIP_TO_PREVIOUS | PlaybackState.ACTION_FAST_FORWARD | PlaybackState.ACTION_REWIND | PlaybackState.ACTION_PAUSE; if (nextState == PlaybackState.STATE_PLAYING) { actions |= PlaybackState.ACTION_PAUSE; } return actions; } private void play() { // Request audio focus whenever we resume playback // because the app might have abandoned audio focus due to the AUDIOFOCUS_LOSS. requestAudioFocus(); if (mPlayer == null) { setPlaybackState(PlaybackState.STATE_NONE); return; } if (!mGlue.isMediaPlaying()) { mPlayer.getPlayerControl().start(); setPlaybackState(PlaybackState.STATE_PLAYING); } } private void pause() { mPauseTransient = false; if (mPlayer == null) { setPlaybackState(PlaybackState.STATE_NONE); return; } if (mGlue.isMediaPlaying()) { mPlayer.getPlayerControl().pause(); setPlaybackState(PlaybackState.STATE_PAUSED); } } private void requestAudioFocus() { if (mHasAudioFocus) { return; } int result = mAudioManager.requestAudioFocus(mOnAudioFocusChangeListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN); if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) { mHasAudioFocus = true; } else { pause(); } } private void abandonAudioFocus() { mHasAudioFocus = false; mAudioManager.abandonAudioFocus(mOnAudioFocusChangeListener); } void updatePlaybackRow() { mRowsAdapter.notifyArrayItemRangeChanged(0, 1); } /** * Creates a ListRow for related videos. */ private void addOtherRows() { mVideoCursorAdapter = new CursorObjectAdapter(new CardPresenter()); mVideoCursorAdapter.setMapper(new VideoCursorMapper()); Bundle args = new Bundle(); args.putString(VideoContract.VideoEntry.COLUMN_CATEGORY, mSelectedVideo.category); getLoaderManager().initLoader(RECOMMENDED_VIDEOS_LOADER, args, this); HeaderItem header = new HeaderItem(getString(R.string.related_movies)); mRowsAdapter.add(new ListRow(header, mVideoCursorAdapter)); } private VideoPlayer.RendererBuilder getRendererBuilder() { String userAgent = Util.getUserAgent(getActivity(), "ExoVideoPlayer"); Uri contentUri = Uri.parse(mSelectedVideo.videoUrl); int contentType = Util.inferContentType(contentUri.getLastPathSegment()); switch (contentType) { case Util.TYPE_OTHER: { return new ExtractorRendererBuilder(getActivity(), userAgent, contentUri); } default: { throw new IllegalStateException("Unsupported type: " + contentType); } } } private void preparePlayer() { if (mPlayer == null) { mPlayer = new VideoPlayer(getRendererBuilder()); mPlayer.addListener(this); mPlayer.seekTo(0L); mPlayer.prepare(); } else { mPlayer.stop(); mPlayer.seekTo(0L); mPlayer.setRendererBuilder(getRendererBuilder()); mPlayer.prepare(); } mPlayer.setPlayWhenReady(true); requestAudioFocus(); } private void releasePlayer() { if (mPlayer != null) { mPlayer.release(); mPlayer = null; } abandonAudioFocus(); } @Override public void onStateChanged(boolean playWhenReady, int playbackState) { switch (playbackState) { case ExoPlayer.STATE_BUFFERING: // Do nothing. break; case ExoPlayer.STATE_ENDED: mIsMetadataSet = false; mMediaController.getTransportControls().skipToNext(); break; case ExoPlayer.STATE_IDLE: // Do nothing. break; case ExoPlayer.STATE_PREPARING: mIsMetadataSet = false; break; case ExoPlayer.STATE_READY: // Duration is set here. if (!mIsMetadataSet) { updateMetadata(mSelectedVideo); mIsMetadataSet = true; } break; default: // Do nothing. break; } } @Override public void onError(Exception e) { Log.e(TAG, "An error occurred: " + e); } @Override public void onVideoSizeChanged(int width, int height, int unappliedRotationDegrees, float pixelWidthHeightRatio) { // Do nothing. } @Override public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) { if (mPlayer != null) { mPlayer.setSurface(new Surface(surfaceTexture)); } } @Override public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) { // Do nothing. } @Override public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) { if (mPlayer != null) { mPlayer.blockingClearSurface(); } return true; } @Override public void onSurfaceTextureUpdated(SurfaceTexture surface) { // Do nothing. } private int getPlaybackState() { Activity activity = getActivity(); if (activity != null) { PlaybackState state = activity.getMediaController().getPlaybackState(); if (state != null) { return state.getState(); } else { return PlaybackState.STATE_NONE; } } return PlaybackState.STATE_NONE; } private void setPlaybackState(int state) { long currPosition = getCurrentPosition(); PlaybackStateCompat.Builder stateBuilder = new PlaybackStateCompat.Builder() .setActions(getAvailableActions(state)); stateBuilder.setState(state, currPosition, 1.0f); mSession.setPlaybackState(stateBuilder.build()); } private void updateMetadata(final Video video) { final MediaMetadataCompat.Builder metadataBuilder = new MediaMetadataCompat.Builder(); metadataBuilder.putString(MediaMetadataCompat.METADATA_KEY_MEDIA_ID, video.id + ""); metadataBuilder.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_TITLE, video.title); metadataBuilder.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_SUBTITLE, video.studio); metadataBuilder.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_DESCRIPTION, video.description); long duration = Utils.getDuration(video.videoUrl); metadataBuilder.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, duration); // And at minimum the title and artist for legacy support metadataBuilder.putString(MediaMetadataCompat.METADATA_KEY_TITLE, video.title); metadataBuilder.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, video.studio); Resources res = getResources(); int cardWidth = res.getDimensionPixelSize(R.dimen.playback_overlay_width); int cardHeight = res.getDimensionPixelSize(R.dimen.playback_overlay_height); Glide.with(this).load(Uri.parse(video.cardImageUrl)).asBitmap().centerCrop() .into(new SimpleTarget<Bitmap>(cardWidth, cardHeight) { @Override public void onResourceReady(Bitmap bitmap, GlideAnimation anim) { metadataBuilder.putBitmap(MediaMetadataCompat.METADATA_KEY_ART, bitmap); mSession.setMetadata(metadataBuilder.build()); } }); } private void playVideo(Video video, Bundle extras) { updateSelectedVideo(video); preparePlayer(); setPlaybackState(PlaybackState.STATE_PAUSED); if (extras.getBoolean(AUTO_PLAY)) { play(); } else { pause(); } } private void startPlaying() { // Prepare the player and start playing the selected video playVideo(mSelectedVideo, mAutoPlayExtras); // Start loading videos for the queue Bundle args = new Bundle(); args.putString(VideoContract.VideoEntry.COLUMN_CATEGORY, mSelectedVideo.category); getLoaderManager().initLoader(QUEUE_VIDEOS_LOADER, args, mCallbacks); } private final class ItemViewClickedListener implements OnItemViewClickedListener { @Override public void onItemClicked(Presenter.ViewHolder itemViewHolder, Object item, RowPresenter.ViewHolder rowViewHolder, Row row) { if (item instanceof Video) { Video video = (Video) item; Intent intent = new Intent(getActivity(), PlaybackOverlayActivity.class); intent.putExtra(VideoDetailsActivity.VIDEO, video); Bundle bundle = ActivityOptionsCompat.makeSceneTransitionAnimation(getActivity(), ((ImageCardView) itemViewHolder.view).getMainImageView(), VideoDetailsActivity.SHARED_ELEMENT_NAME).toBundle(); getActivity().startActivity(intent, bundle); } } } // An event was triggered by MediaController.TransportControls and must be handled here. // Here we update the media itself to act on the event that was triggered. private class MediaSessionCallback extends MediaSessionCompat.Callback { @Override public void onPlay() { play(); } @Override // This method should play any media item regardless of the Queue. public void onPlayFromMediaId(String mediaId, Bundle extras) { Bundle args = new Bundle(); args.putString(VideoContract.VideoEntry._ID, mediaId); getLoaderManager().initLoader(mSpecificVideoLoaderId++, args, mCallbacks); } @Override public void onPause() { pause(); } @Override public void onSkipToNext() { // Update the media to skip to the next video. Bundle bundle = new Bundle(); bundle.putBoolean(AUTO_PLAY, true); int nextIndex = ++mQueueIndex; if (nextIndex < mQueue.size()) { MediaSessionCompat.QueueItem item = mQueue.get(nextIndex); String mediaId = item.getDescription().getMediaId(); getActivity().getMediaController().getTransportControls().playFromMediaId(mediaId, bundle); } else { getActivity().onBackPressed(); // Return to details presenter. } } @Override public void onSkipToPrevious() { // Update the media to skip to the previous video. setPlaybackState(PlaybackState.STATE_SKIPPING_TO_PREVIOUS); Bundle bundle = new Bundle(); bundle.putBoolean(AUTO_PLAY, true); int prevIndex = --mQueueIndex; if (prevIndex >= 0) { MediaSessionCompat.QueueItem item = mQueue.get(prevIndex); String mediaId = item.getDescription().getMediaId(); getActivity().getMediaController().getTransportControls().playFromMediaId(mediaId, bundle); } else { getActivity().onBackPressed(); // Return to details presenter. } } @Override public void onFastForward() { if (mPlayer.getDuration() != ExoPlayer.UNKNOWN_TIME) { // Fast forward 10 seconds. int prevState = getPlaybackState(); setPlaybackState(PlaybackState.STATE_FAST_FORWARDING); setPosition(mPlayer.getCurrentPosition() + (10 * 1000)); setPlaybackState(prevState); } } @Override public void onRewind() { // Rewind 10 seconds. int prevState = getPlaybackState(); setPlaybackState(PlaybackState.STATE_REWINDING); setPosition(mPlayer.getCurrentPosition() - (10 * 1000)); setPlaybackState(prevState); } @Override public void onSeekTo(long position) { setPosition(position); } } }