QueueFragment.java revision a907614755847b2630561a1e5949b2b416600d97 
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.app.Fragment;
20import android.content.ComponentName;
21import android.os.Bundle;
22import android.os.RemoteException;
23import android.support.v4.media.MediaBrowserCompat;
24import android.support.v4.media.session.MediaControllerCompat;
25import android.support.v4.media.session.MediaSessionCompat;
26import android.support.v4.media.session.PlaybackStateCompat;
27import android.util.Log;
28import android.view.LayoutInflater;
29import android.view.View;
30import android.view.ViewGroup;
31import android.widget.AdapterView;
32import android.widget.ImageButton;
33import android.widget.ListView;
34
35import com.example.android.supportv4.R;
36
37import java.util.List;
38
39/**
40 * A class that shows the Media Queue to the user.
41 */
42public class QueueFragment extends Fragment {
43
44    private static final String TAG = "QueueFragment";
45
46    private ImageButton mSkipNext;
47    private ImageButton mSkipPrevious;
48    private ImageButton mPlayPause;
49
50    private MediaBrowserCompat mMediaBrowser;
51    private MediaControllerCompat.TransportControls mTransportControls;
52    private MediaControllerCompat mMediaController;
53    private PlaybackStateCompat mPlaybackState;
54
55    private QueueAdapter mQueueAdapter;
56
57    private MediaBrowserCompat.ConnectionCallback mConnectionCallback =
58            new MediaBrowserCompat.ConnectionCallback() {
59        @Override
60        public void onConnected() {
61            Log.d(TAG, "onConnected: session token " + mMediaBrowser.getSessionToken());
62
63            if (mMediaBrowser.getSessionToken() == null) {
64                throw new IllegalArgumentException("No Session token");
65            }
66
67            try {
68                mMediaController = new MediaControllerCompat(getActivity(),
69                        mMediaBrowser.getSessionToken());
70            } catch (RemoteException e) {
71                Log.e(TAG, "Failed to create MediaControllerCompat.", e);
72            }
73            mTransportControls = mMediaController.getTransportControls();
74            mMediaController.registerCallback(mSessionCallback);
75
76            ((MediaBrowserSupport) getActivity()).setMediaController(mMediaController);
77            mPlaybackState = mMediaController.getPlaybackState();
78
79            List<MediaSessionCompat.QueueItem> queue = mMediaController.getQueue();
80            if (queue != null) {
81                mQueueAdapter.clear();
82                mQueueAdapter.notifyDataSetInvalidated();
83                mQueueAdapter.addAll(queue);
84                mQueueAdapter.notifyDataSetChanged();
85            }
86            onPlaybackStateChanged(mPlaybackState);
87        }
88
89        @Override
90        public void onConnectionFailed() {
91            Log.d(TAG, "onConnectionFailed");
92        }
93
94        @Override
95        public void onConnectionSuspended() {
96            Log.d(TAG, "onConnectionSuspended");
97            mMediaController.unregisterCallback(mSessionCallback);
98            mTransportControls = null;
99            mMediaController = null;
100            getActivity().setMediaController(null);
101        }
102    };
103
104    // Receive callbacks from the MediaController. Here we update our state such as which queue
105    // is being shown, the current title and description and the PlaybackState.
106    private MediaControllerCompat.Callback mSessionCallback = new MediaControllerCompat.Callback() {
107
108        @Override
109        public void onSessionDestroyed() {
110            Log.d(TAG, "Session destroyed. Need to fetch a new Media Session");
111        }
112
113        @Override
114        public void onPlaybackStateChanged(PlaybackStateCompat state) {
115            if (state == null) {
116                return;
117            }
118            Log.d(TAG, "Received playback state change to state " + state.getState());
119            mPlaybackState = state;
120            QueueFragment.this.onPlaybackStateChanged(state);
121        }
122
123        @Override
124        public void onQueueChanged(List<MediaSessionCompat.QueueItem> queue) {
125            Log.d(TAG, "onQueueChanged " + queue);
126            if (queue != null) {
127                mQueueAdapter.clear();
128                mQueueAdapter.notifyDataSetInvalidated();
129                mQueueAdapter.addAll(queue);
130                mQueueAdapter.notifyDataSetChanged();
131            }
132        }
133    };
134
135    public static QueueFragment newInstance() {
136        return new QueueFragment();
137    }
138
139    @Override
140    public View onCreateView(LayoutInflater inflater, ViewGroup container,
141                             Bundle savedInstanceState) {
142        View rootView = inflater.inflate(R.layout.fragment_list, container, false);
143
144        mSkipPrevious = (ImageButton) rootView.findViewById(R.id.skip_previous);
145        mSkipPrevious.setEnabled(false);
146        mSkipPrevious.setOnClickListener(mButtonListener);
147
148        mSkipNext = (ImageButton) rootView.findViewById(R.id.skip_next);
149        mSkipNext.setEnabled(false);
150        mSkipNext.setOnClickListener(mButtonListener);
151
152        mPlayPause = (ImageButton) rootView.findViewById(R.id.play_pause);
153        mPlayPause.setEnabled(true);
154        mPlayPause.setOnClickListener(mButtonListener);
155
156        mQueueAdapter = new QueueAdapter(getActivity());
157
158        ListView mListView = (ListView) rootView.findViewById(R.id.list_view);
159        mListView.setAdapter(mQueueAdapter);
160        mListView.setFocusable(true);
161        mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
162            @Override
163            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
164                MediaSessionCompat.QueueItem item = mQueueAdapter.getItem(position);
165                mTransportControls.skipToQueueItem(item.getQueueId());
166            }
167        });
168
169        mMediaBrowser = new MediaBrowserCompat(getActivity(),
170                new ComponentName(getActivity(), MediaBrowserServiceSupport.class),
171                mConnectionCallback, null);
172
173        return rootView;
174    }
175
176    @Override
177    public void onResume() {
178        super.onResume();
179        if (mMediaBrowser != null) {
180            mMediaBrowser.connect();
181        }
182    }
183
184    @Override
185    public void onPause() {
186        super.onPause();
187        if (mMediaController != null) {
188            mMediaController.unregisterCallback(mSessionCallback);
189        }
190        if (mMediaBrowser != null) {
191            mMediaBrowser.disconnect();
192        }
193    }
194
195
196    private void onPlaybackStateChanged(PlaybackStateCompat state) {
197        Log.d(TAG, "onPlaybackStateChanged " + state);
198        if (state == null) {
199            return;
200        }
201        mQueueAdapter.setActiveQueueItemId(state.getActiveQueueItemId());
202        mQueueAdapter.notifyDataSetChanged();
203        boolean enablePlay = false;
204        StringBuilder statusBuilder = new StringBuilder();
205        switch (state.getState()) {
206            case PlaybackStateCompat.STATE_PLAYING:
207                statusBuilder.append("playing");
208                enablePlay = false;
209                break;
210            case PlaybackStateCompat.STATE_PAUSED:
211                statusBuilder.append("paused");
212                enablePlay = true;
213                break;
214            case PlaybackStateCompat.STATE_STOPPED:
215                statusBuilder.append("ended");
216                enablePlay = true;
217                break;
218            case PlaybackStateCompat.STATE_ERROR:
219                statusBuilder.append("error: ").append(state.getErrorMessage());
220                break;
221            case PlaybackStateCompat.STATE_BUFFERING:
222                statusBuilder.append("buffering");
223                break;
224            case PlaybackStateCompat.STATE_NONE:
225                statusBuilder.append("none");
226                enablePlay = false;
227                break;
228            case PlaybackStateCompat.STATE_CONNECTING:
229                statusBuilder.append("connecting");
230                break;
231            default:
232                statusBuilder.append(mPlaybackState);
233        }
234        statusBuilder.append(" -- At position: ").append(state.getPosition());
235        Log.d(TAG, statusBuilder.toString());
236
237        if (enablePlay) {
238            mPlayPause.setImageDrawable(
239                    getActivity().getResources().getDrawable(R.drawable.ic_play_arrow_white_24dp));
240        } else {
241            mPlayPause.setImageDrawable(
242                    getActivity().getResources().getDrawable(R.drawable.ic_pause_white_24dp));
243        }
244
245        mSkipPrevious.setEnabled((state.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS)
246                != 0);
247        mSkipNext.setEnabled((state.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_NEXT) != 0);
248
249        Log.d(TAG, "Queue From MediaController *** Title "
250                + mMediaController.getQueueTitle() + "\n: Queue: " + mMediaController.getQueue()
251                + "\n Metadata " + mMediaController.getMetadata());
252    }
253
254    private View.OnClickListener mButtonListener = new View.OnClickListener() {
255        @Override
256        public void onClick(View v) {
257            final int state = mPlaybackState == null ?
258                    PlaybackStateCompat.STATE_NONE : mPlaybackState.getState();
259            switch (v.getId()) {
260                case R.id.play_pause:
261                    Log.d(TAG, "Play button pressed, in state " + state);
262                    if (state == PlaybackStateCompat.STATE_PAUSED ||
263                            state == PlaybackStateCompat.STATE_STOPPED ||
264                            state == PlaybackStateCompat.STATE_NONE) {
265                        playMedia();
266                    } else if (state == PlaybackStateCompat.STATE_PLAYING) {
267                        pauseMedia();
268                    }
269                    break;
270                case R.id.skip_previous:
271                    Log.d(TAG, "Start button pressed, in state " + state);
272                    skipToPrevious();
273                    break;
274                case R.id.skip_next:
275                    skipToNext();
276                    break;
277            }
278        }
279    };
280
281    private void playMedia() {
282        if (mTransportControls != null) {
283            mTransportControls.play();
284        }
285    }
286
287    private void pauseMedia() {
288        if (mTransportControls != null) {
289            mTransportControls.pause();
290        }
291    }
292
293    private void skipToPrevious() {
294        if (mTransportControls != null) {
295            mTransportControls.skipToPrevious();
296        }
297    }
298
299    private void skipToNext() {
300        if (mTransportControls != null) {
301            mTransportControls.skipToNext();
302        }
303    }
304}
305