1/*
2 * Copyright (C) 2010 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.android.music;
18
19import android.app.Activity;
20import android.content.AsyncQueryHandler;
21import android.content.ContentResolver;
22import android.content.Context;
23import android.content.Intent;
24import android.database.Cursor;
25import android.media.AudioManager;
26import android.media.MediaPlayer;
27import android.media.AudioManager.OnAudioFocusChangeListener;
28import android.media.MediaPlayer.OnCompletionListener;
29import android.media.MediaPlayer.OnErrorListener;
30import android.media.MediaPlayer.OnPreparedListener;
31import android.net.Uri;
32import android.os.Bundle;
33import android.os.Handler;
34import android.provider.MediaStore;
35import android.provider.OpenableColumns;
36import android.text.TextUtils;
37import android.util.Log;
38import android.view.KeyEvent;
39import android.view.Menu;
40import android.view.MenuItem;
41import android.view.View;
42import android.view.Window;
43import android.view.WindowManager;
44import android.widget.ImageButton;
45import android.widget.ProgressBar;
46import android.widget.SeekBar;
47import android.widget.TextView;
48import android.widget.SeekBar.OnSeekBarChangeListener;
49import android.widget.Toast;
50
51import java.io.IOException;
52
53/**
54 * Dialog that comes up in response to various music-related VIEW intents.
55 */
56public class AudioPreview
57        extends Activity implements OnPreparedListener, OnErrorListener, OnCompletionListener {
58    private final static String TAG = "AudioPreview";
59    private PreviewPlayer mPlayer;
60    private TextView mTextLine1;
61    private TextView mTextLine2;
62    private TextView mLoadingText;
63    private SeekBar mSeekBar;
64    private Handler mProgressRefresher;
65    private boolean mSeeking = false;
66    private boolean mUiPaused = true;
67    private int mDuration;
68    private Uri mUri;
69    private long mMediaId = -1;
70    private static final int OPEN_IN_MUSIC = 1;
71    private AudioManager mAudioManager;
72    private boolean mPausedByTransientLossOfFocus;
73
74    @Override
75    public void onCreate(Bundle icicle) {
76        super.onCreate(icicle);
77
78        Intent intent = getIntent();
79        if (intent == null) {
80            finish();
81            return;
82        }
83        mUri = intent.getData();
84        if (mUri == null) {
85            finish();
86            return;
87        }
88        String scheme = mUri.getScheme();
89
90        setVolumeControlStream(AudioManager.STREAM_MUSIC);
91        requestWindowFeature(Window.FEATURE_NO_TITLE);
92        setContentView(R.layout.audiopreview);
93
94        mTextLine1 = (TextView) findViewById(R.id.line1);
95        mTextLine2 = (TextView) findViewById(R.id.line2);
96        mLoadingText = (TextView) findViewById(R.id.loading);
97        if (scheme.equals("http")) {
98            String msg = getString(R.string.streamloadingtext, mUri.getHost());
99            mLoadingText.setText(msg);
100        } else {
101            mLoadingText.setVisibility(View.GONE);
102        }
103        mSeekBar = (SeekBar) findViewById(R.id.progress);
104        mProgressRefresher = new Handler();
105        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
106
107        PreviewPlayer player = (PreviewPlayer) getLastNonConfigurationInstance();
108        if (player == null) {
109            mPlayer = new PreviewPlayer();
110            mPlayer.setActivity(this);
111            try {
112                mPlayer.setDataSourceAndPrepare(mUri);
113            } catch (Exception ex) {
114                // catch generic Exception, since we may be called with a media
115                // content URI, another content provider's URI, a file URI,
116                // an http URI, and there are different exceptions associated
117                // with failure to open each of those.
118                Log.d(TAG, "Failed to open file: " + ex);
119                Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show();
120                finish();
121                return;
122            }
123        } else {
124            mPlayer = player;
125            mPlayer.setActivity(this);
126            // onResume will update the UI
127        }
128
129        AsyncQueryHandler mAsyncQueryHandler = new AsyncQueryHandler(getContentResolver()) {
130            @Override
131            protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
132                if (cursor != null && cursor.moveToFirst()) {
133                    int titleIdx = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
134                    int artistIdx = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
135                    int idIdx = cursor.getColumnIndex(MediaStore.Audio.Media._ID);
136                    int displaynameIdx = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
137
138                    if (idIdx >= 0) {
139                        mMediaId = cursor.getLong(idIdx);
140                    }
141
142                    if (titleIdx >= 0) {
143                        String title = cursor.getString(titleIdx);
144                        mTextLine1.setText(title);
145                        if (artistIdx >= 0) {
146                            String artist = cursor.getString(artistIdx);
147                            mTextLine2.setText(artist);
148                        }
149                    } else if (displaynameIdx >= 0) {
150                        String name = cursor.getString(displaynameIdx);
151                        mTextLine1.setText(name);
152                    } else {
153                        // Couldn't find anything to display, what to do now?
154                        Log.w(TAG, "Cursor had no names for us");
155                    }
156                } else {
157                    Log.w(TAG, "empty cursor");
158                }
159
160                if (cursor != null) {
161                    cursor.close();
162                }
163                setNames();
164            }
165        };
166
167        if (scheme.equals(ContentResolver.SCHEME_CONTENT)) {
168            if (mUri.getAuthority() == MediaStore.AUTHORITY) {
169                // try to get title and artist from the media content provider
170                mAsyncQueryHandler.startQuery(0, null, mUri,
171                        new String[] {MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.ARTIST},
172                        null, null, null);
173            } else {
174                // Try to get the display name from another content provider.
175                // Don't specifically ask for the display name though, since the
176                // provider might not actually support that column.
177                mAsyncQueryHandler.startQuery(0, null, mUri, null, null, null, null);
178            }
179        } else if (scheme.equals("file")) {
180            // check if this file is in the media database (clicking on a download
181            // in the download manager might follow this path
182            String path = mUri.getPath();
183            mAsyncQueryHandler.startQuery(0, null, MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
184                    new String[] {MediaStore.Audio.Media._ID, MediaStore.Audio.Media.TITLE,
185                            MediaStore.Audio.Media.ARTIST},
186                    MediaStore.Audio.Media.DATA + "=?", new String[] {path}, null);
187        } else {
188            // We can't get metadata from the file/stream itself yet, because
189            // that API is hidden, so instead we display the URI being played
190            if (mPlayer.isPrepared()) {
191                setNames();
192            }
193        }
194    }
195
196    @Override
197    public void onPause() {
198        super.onPause();
199        mUiPaused = true;
200        if (mProgressRefresher != null) {
201            mProgressRefresher.removeCallbacksAndMessages(null);
202        }
203    }
204
205    @Override
206    public void onResume() {
207        super.onResume();
208        mUiPaused = false;
209        if (mPlayer.isPrepared()) {
210            showPostPrepareUI();
211        }
212    }
213
214    @Override
215    public Object onRetainNonConfigurationInstance() {
216        PreviewPlayer player = mPlayer;
217        mPlayer = null;
218        return player;
219    }
220
221    @Override
222    public void onDestroy() {
223        stopPlayback();
224        super.onDestroy();
225    }
226
227    private void stopPlayback() {
228        if (mProgressRefresher != null) {
229            mProgressRefresher.removeCallbacksAndMessages(null);
230        }
231        if (mPlayer != null) {
232            mPlayer.release();
233            mPlayer = null;
234            mAudioManager.abandonAudioFocus(mAudioFocusListener);
235        }
236    }
237
238    @Override
239    public void onUserLeaveHint() {
240        stopPlayback();
241        finish();
242        super.onUserLeaveHint();
243    }
244
245    public void onPrepared(MediaPlayer mp) {
246        if (isFinishing()) return;
247        mPlayer = (PreviewPlayer) mp;
248        setNames();
249        mPlayer.start();
250        showPostPrepareUI();
251    }
252
253    private void showPostPrepareUI() {
254        ProgressBar pb = (ProgressBar) findViewById(R.id.spinner);
255        pb.setVisibility(View.GONE);
256        mDuration = mPlayer.getDuration();
257        if (mDuration != 0) {
258            mSeekBar.setMax(mDuration);
259            mSeekBar.setVisibility(View.VISIBLE);
260            if (!mSeeking) {
261                mSeekBar.setProgress(mPlayer.getCurrentPosition());
262            }
263        }
264        mSeekBar.setOnSeekBarChangeListener(mSeekListener);
265        mLoadingText.setVisibility(View.GONE);
266        View v = findViewById(R.id.titleandbuttons);
267        v.setVisibility(View.VISIBLE);
268        mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
269                AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
270        if (mProgressRefresher != null) {
271            mProgressRefresher.removeCallbacksAndMessages(null);
272            mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
273        }
274        updatePlayPause();
275    }
276
277    private OnAudioFocusChangeListener mAudioFocusListener = new OnAudioFocusChangeListener() {
278        public void onAudioFocusChange(int focusChange) {
279            if (mPlayer == null) {
280                // this activity has handed its MediaPlayer off to the next activity
281                // (e.g. portrait/landscape switch) and should abandon its focus
282                mAudioManager.abandonAudioFocus(this);
283                return;
284            }
285            switch (focusChange) {
286                case AudioManager.AUDIOFOCUS_LOSS:
287                    mPausedByTransientLossOfFocus = false;
288                    mPlayer.pause();
289                    break;
290                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
291                case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
292                    if (mPlayer.isPlaying()) {
293                        mPausedByTransientLossOfFocus = true;
294                        mPlayer.pause();
295                    }
296                    break;
297                case AudioManager.AUDIOFOCUS_GAIN:
298                    if (mPausedByTransientLossOfFocus) {
299                        mPausedByTransientLossOfFocus = false;
300                        start();
301                    }
302                    break;
303            }
304            updatePlayPause();
305        }
306    };
307
308    private void start() {
309        mAudioManager.requestAudioFocus(mAudioFocusListener, AudioManager.STREAM_MUSIC,
310                AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
311        mPlayer.start();
312        mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
313    }
314
315    public void setNames() {
316        if (TextUtils.isEmpty(mTextLine1.getText())) {
317            mTextLine1.setText(mUri.getLastPathSegment());
318        }
319        if (TextUtils.isEmpty(mTextLine2.getText())) {
320            mTextLine2.setVisibility(View.GONE);
321        } else {
322            mTextLine2.setVisibility(View.VISIBLE);
323        }
324    }
325
326    class ProgressRefresher implements Runnable {
327        @Override
328        public void run() {
329            if (mPlayer != null && !mSeeking && mDuration != 0) {
330                mSeekBar.setProgress(mPlayer.getCurrentPosition());
331            }
332            mProgressRefresher.removeCallbacksAndMessages(null);
333            if (!mUiPaused) {
334                mProgressRefresher.postDelayed(new ProgressRefresher(), 200);
335            }
336        }
337    }
338
339    private void updatePlayPause() {
340        ImageButton b = (ImageButton) findViewById(R.id.playpause);
341        if (b != null && mPlayer != null) {
342            if (mPlayer.isPlaying()) {
343                b.setImageResource(R.drawable.btn_playback_ic_pause_small);
344            } else {
345                b.setImageResource(R.drawable.btn_playback_ic_play_small);
346                mProgressRefresher.removeCallbacksAndMessages(null);
347            }
348        }
349    }
350
351    private OnSeekBarChangeListener mSeekListener = new OnSeekBarChangeListener() {
352        public void onStartTrackingTouch(SeekBar bar) {
353            mSeeking = true;
354        }
355        public void onProgressChanged(SeekBar bar, int progress, boolean fromuser) {
356            if (!fromuser) {
357                return;
358            }
359            // Protection for case of simultaneously tapping on seek bar and exit
360            if (mPlayer == null) {
361                return;
362            }
363            mPlayer.seekTo(progress);
364        }
365        public void onStopTrackingTouch(SeekBar bar) {
366            mSeeking = false;
367        }
368    };
369
370    public boolean onError(MediaPlayer mp, int what, int extra) {
371        Toast.makeText(this, R.string.playback_failed, Toast.LENGTH_SHORT).show();
372        finish();
373        return true;
374    }
375
376    public void onCompletion(MediaPlayer mp) {
377        mSeekBar.setProgress(mDuration);
378        updatePlayPause();
379    }
380
381    public void playPauseClicked(View v) {
382        // Protection for case of simultaneously tapping on play/pause and exit
383        if (mPlayer == null) {
384            return;
385        }
386        if (mPlayer.isPlaying()) {
387            mPlayer.pause();
388        } else {
389            start();
390        }
391        updatePlayPause();
392    }
393
394    @Override
395    public boolean onCreateOptionsMenu(Menu menu) {
396        super.onCreateOptionsMenu(menu);
397        // TODO: if mMediaId != -1, then the playing file has an entry in the media
398        // database, and we could open it in the full music app instead.
399        // Ideally, we would hand off the currently running mediaplayer
400        // to the music UI, which can probably be done via a public static
401        menu.add(0, OPEN_IN_MUSIC, 0, "open in music");
402        return true;
403    }
404
405    @Override
406    public boolean onPrepareOptionsMenu(Menu menu) {
407        MenuItem item = menu.findItem(OPEN_IN_MUSIC);
408        if (mMediaId >= 0) {
409            item.setVisible(true);
410            return true;
411        }
412        item.setVisible(false);
413        return false;
414    }
415
416    @Override
417    public boolean onKeyDown(int keyCode, KeyEvent event) {
418        switch (keyCode) {
419            case KeyEvent.KEYCODE_HEADSETHOOK:
420            case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
421                if (mPlayer.isPlaying()) {
422                    mPlayer.pause();
423                } else {
424                    start();
425                }
426                updatePlayPause();
427                return true;
428            case KeyEvent.KEYCODE_MEDIA_PLAY:
429                start();
430                updatePlayPause();
431                return true;
432            case KeyEvent.KEYCODE_MEDIA_PAUSE:
433                if (mPlayer.isPlaying()) {
434                    mPlayer.pause();
435                }
436                updatePlayPause();
437                return true;
438            case KeyEvent.KEYCODE_MEDIA_FAST_FORWARD:
439            case KeyEvent.KEYCODE_MEDIA_NEXT:
440            case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
441            case KeyEvent.KEYCODE_MEDIA_REWIND:
442                return true;
443            case KeyEvent.KEYCODE_MEDIA_STOP:
444            case KeyEvent.KEYCODE_BACK:
445                stopPlayback();
446                finish();
447                return true;
448        }
449        return super.onKeyDown(keyCode, event);
450    }
451
452    /*
453     * Wrapper class to help with handing off the MediaPlayer to the next instance
454     * of the activity in case of orientation change, without losing any state.
455     */
456    private static class PreviewPlayer extends MediaPlayer implements OnPreparedListener {
457        AudioPreview mActivity;
458        boolean mIsPrepared = false;
459
460        public void setActivity(AudioPreview activity) {
461            mActivity = activity;
462            setOnPreparedListener(this);
463            setOnErrorListener(mActivity);
464            setOnCompletionListener(mActivity);
465        }
466
467        public void setDataSourceAndPrepare(Uri uri) throws IllegalArgumentException,
468                                                            SecurityException,
469                                                            IllegalStateException, IOException {
470            setDataSource(mActivity, uri);
471            prepareAsync();
472        }
473
474        /* (non-Javadoc)
475         * @see android.media.MediaPlayer.OnPreparedListener#onPrepared(android.media.MediaPlayer)
476         */
477        @Override
478        public void onPrepared(MediaPlayer mp) {
479            mIsPrepared = true;
480            mActivity.onPrepared(mp);
481        }
482
483        boolean isPrepared() {
484            return mIsPrepared;
485        }
486    }
487}
488