QueueFragment.java revision ff7a534d72423924d6087a011d17634a42199c03 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.supportv4.media;
18
19import android.content.ComponentName;
20import android.os.Bundle;
21import android.os.RemoteException;
22import android.support.v4.app.Fragment;
23import android.support.v4.content.ContextCompat;
24import android.support.v4.media.MediaBrowserCompat;
25import android.support.v4.media.session.MediaControllerCompat;
26import android.support.v4.media.session.MediaSessionCompat;
27import android.support.v4.media.session.PlaybackStateCompat;
28import android.util.Log;
29import android.view.LayoutInflater;
30import android.view.View;
31import android.view.ViewGroup;
32import android.widget.AdapterView;
33import android.widget.ImageButton;
34import android.widget.ListView;
35
36import com.example.android.supportv4.R;
37
38import java.util.List;
39
40/**
41 * A class that shows the Media Queue to the user.
42 */
43public class QueueFragment extends Fragment {
44
45    private static final String TAG = "QueueFragment";
46
47    private ImageButton mSkipNext;
48    private ImageButton mSkipPrevious;
49    private ImageButton mPlayPause;
50
51    private MediaBrowserCompat mMediaBrowser;
52    private MediaControllerCompat.TransportControls mTransportControls;
53    private MediaControllerCompat mMediaController;
54    private PlaybackStateCompat mPlaybackState;
55
56    private QueueAdapter mQueueAdapter;
57
58    private MediaBrowserCompat.ConnectionCallback mConnectionCallback =
59            new MediaBrowserCompat.ConnectionCallback() {
60        @Override
61        public void onConnected() {
62            Log.d(TAG, "onConnected: session token " + mMediaBrowser.getSessionToken());
63
64            if (mMediaBrowser.getSessionToken() == null) {
65                throw new IllegalArgumentException("No Session token");
66            }
67
68            try {
69                mMediaController = new MediaControllerCompat(getActivity(),
70                        mMediaBrowser.getSessionToken());
71            } catch (RemoteException e) {
72                Log.e(TAG, "Failed to create MediaControllerCompat.", e);
73            }
74            mTransportControls = mMediaController.getTransportControls();
75            mMediaController.registerCallback(mSessionCallback);
76
77            ((MediaBrowserSupport) getActivity()).setMediaController(mMediaController);
78            mPlaybackState = mMediaController.getPlaybackState();
79
80            List<MediaSessionCompat.QueueItem> queue = mMediaController.getQueue();
81            if (queue != null) {
82                mQueueAdapter.clear();
83                mQueueAdapter.notifyDataSetInvalidated();
84                mQueueAdapter.addAll(queue);
85                mQueueAdapter.notifyDataSetChanged();
86            }
87            onPlaybackStateChanged(mPlaybackState);
88        }
89
90        @Override
91        public void onConnectionFailed() {
92            Log.d(TAG, "onConnectionFailed");
93        }
94
95        @Override
96        public void onConnectionSuspended() {
97            Log.d(TAG, "onConnectionSuspended");
98            mMediaController.unregisterCallback(mSessionCallback);
99            mTransportControls = null;
100            mMediaController = null;
101            ((MediaBrowserSupport) getActivity()).setMediaController((MediaControllerCompat) null);
102        }
103    };
104
105    // Receive callbacks from the MediaController. Here we update our state such as which queue
106    // is being shown, the current title and description and the PlaybackState.
107    private MediaControllerCompat.Callback mSessionCallback = new MediaControllerCompat.Callback() {
108
109        @Override
110        public void onSessionDestroyed() {
111            Log.d(TAG, "Session destroyed. Need to fetch a new Media Session");
112        }
113
114        @Override
115        public void onPlaybackStateChanged(PlaybackStateCompat state) {
116            if (state == null) {
117                return;
118            }
119            Log.d(TAG, "Received playback state change to state " + state.getState());
120            mPlaybackState = state;
121            QueueFragment.this.onPlaybackStateChanged(state);
122        }
123
124        @Override
125        public void onQueueChanged(List<MediaSessionCompat.QueueItem> queue) {
126            Log.d(TAG, "onQueueChanged " + queue);
127            if (queue != null) {
128                mQueueAdapter.clear();
129                mQueueAdapter.notifyDataSetInvalidated();
130                mQueueAdapter.addAll(queue);
131                mQueueAdapter.notifyDataSetChanged();
132            }
133        }
134    };
135
136    public static QueueFragment newInstance() {
137        return new QueueFragment();
138    }
139
140    @Override
141    public View onCreateView(LayoutInflater inflater, ViewGroup container,
142                             Bundle savedInstanceState) {
143        View rootView = inflater.inflate(R.layout.fragment_list, container, false);
144
145        mSkipPrevious = (ImageButton) rootView.findViewById(R.id.skip_previous);
146        mSkipPrevious.setEnabled(false);
147        mSkipPrevious.setOnClickListener(mButtonListener);
148
149        mSkipNext = (ImageButton) rootView.findViewById(R.id.skip_next);
150        mSkipNext.setEnabled(false);
151        mSkipNext.setOnClickListener(mButtonListener);
152
153        mPlayPause = (ImageButton) rootView.findViewById(R.id.play_pause);
154        mPlayPause.setEnabled(true);
155        mPlayPause.setOnClickListener(mButtonListener);
156
157        mQueueAdapter = new QueueAdapter(getActivity());
158
159        ListView mListView = (ListView) rootView.findViewById(R.id.list_view);
160        mListView.setAdapter(mQueueAdapter);
161        mListView.setFocusable(true);
162        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
163            @Override
164            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
165                MediaSessionCompat.QueueItem item = mQueueAdapter.getItem(position);
166                mTransportControls.skipToQueueItem(item.getQueueId());
167            }
168        });
169
170        mMediaBrowser = new MediaBrowserCompat(getActivity(),
171                new ComponentName(getActivity(), MediaBrowserServiceSupport.class),
172                mConnectionCallback, null);
173
174        return rootView;
175    }
176
177    @Override
178    public void onResume() {
179        super.onResume();
180        if (mMediaBrowser != null) {
181            mMediaBrowser.connect();
182        }
183    }
184
185    @Override
186    public void onPause() {
187        super.onPause();
188        if (mMediaController != null) {
189            mMediaController.unregisterCallback(mSessionCallback);
190        }
191        if (mMediaBrowser != null) {
192            mMediaBrowser.disconnect();
193        }
194    }
195
196
197    private void onPlaybackStateChanged(PlaybackStateCompat state) {
198        Log.d(TAG, "onPlaybackStateChanged " + state);
199        if (state == null) {
200            return;
201        }
202        mQueueAdapter.setActiveQueueItemId(state.getActiveQueueItemId());
203        mQueueAdapter.notifyDataSetChanged();
204        boolean enablePlay = false;
205        StringBuilder statusBuilder = new StringBuilder();
206        switch (state.getState()) {
207            case PlaybackStateCompat.STATE_PLAYING:
208                statusBuilder.append("playing");
209                enablePlay = false;
210                break;
211            case PlaybackStateCompat.STATE_PAUSED:
212                statusBuilder.append("paused");
213                enablePlay = true;
214                break;
215            case PlaybackStateCompat.STATE_STOPPED:
216                statusBuilder.append("ended");
217                enablePlay = true;
218                break;
219            case PlaybackStateCompat.STATE_ERROR:
220                statusBuilder.append("error: ").append(state.getErrorMessage());
221                break;
222            case PlaybackStateCompat.STATE_BUFFERING:
223                statusBuilder.append("buffering");
224                break;
225            case PlaybackStateCompat.STATE_NONE:
226                statusBuilder.append("none");
227                enablePlay = false;
228                break;
229            case PlaybackStateCompat.STATE_CONNECTING:
230                statusBuilder.append("connecting");
231                break;
232            default:
233                statusBuilder.append(mPlaybackState);
234        }
235        statusBuilder.append(" -- At position: ").append(state.getPosition());
236        Log.d(TAG, statusBuilder.toString());
237
238        if (enablePlay) {
239            mPlayPause.setImageDrawable(
240                    ContextCompat.getDrawable(getActivity(), R.drawable.ic_play_arrow_white_24dp));
241        } else {
242            mPlayPause.setImageDrawable(
243                    ContextCompat.getDrawable(getActivity(), R.drawable.ic_pause_white_24dp));
244        }
245
246        mSkipPrevious.setEnabled((state.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS)
247                != 0);
248        mSkipNext.setEnabled((state.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_NEXT) != 0);
249
250        Log.d(TAG, "Queue From MediaController *** Title "
251                + mMediaController.getQueueTitle() + "\n: Queue: " + mMediaController.getQueue()
252                + "\n Metadata " + mMediaController.getMetadata());
253    }
254
255    private View.OnClickListener mButtonListener = new View.OnClickListener() {
256        @Override
257        public void onClick(View v) {
258            final int state = mPlaybackState == null ?
259                    PlaybackStateCompat.STATE_NONE : mPlaybackState.getState();
260            switch (v.getId()) {
261                case R.id.play_pause:
262                    Log.d(TAG, "Play button pressed, in state " + state);
263                    if (state == PlaybackStateCompat.STATE_PAUSED ||
264                            state == PlaybackStateCompat.STATE_STOPPED ||
265                            state == PlaybackStateCompat.STATE_NONE) {
266                        playMedia();
267                    } else if (state == PlaybackStateCompat.STATE_PLAYING) {
268                        pauseMedia();
269                    }
270                    break;
271                case R.id.skip_previous:
272                    Log.d(TAG, "Start button pressed, in state " + state);
273                    skipToPrevious();
274                    break;
275                case R.id.skip_next:
276                    skipToNext();
277                    break;
278            }
279        }
280    };
281
282    private void playMedia() {
283        if (mTransportControls != null) {
284            mTransportControls.play();
285        }
286    }
287
288    private void pauseMedia() {
289        if (mTransportControls != null) {
290            mTransportControls.pause();
291        }
292    }
293
294    private void skipToPrevious() {
295        if (mTransportControls != null) {
296            mTransportControls.skipToPrevious();
297        }
298    }
299
300    private void skipToNext() {
301        if (mTransportControls != null) {
302            mTransportControls.skipToNext();
303        }
304    }
305}
306