KeyguardTransportControlView.java revision 20daffd91e4a53054f8c4d7a66c2a68100abee03 
1/*
2 * Copyright (C) 2011 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.keyguard;
18
19import android.content.Context;
20import android.content.pm.PackageManager;
21import android.content.res.Configuration;
22import android.graphics.Bitmap;
23import android.graphics.ColorMatrix;
24import android.graphics.ColorMatrixColorFilter;
25import android.graphics.drawable.Drawable;
26import android.media.AudioManager;
27import android.media.MediaMetadataEditor;
28import android.media.MediaMetadataRetriever;
29import android.media.RemoteControlClient;
30import android.media.RemoteController;
31import android.os.Parcel;
32import android.os.Parcelable;
33import android.os.SystemClock;
34import android.text.TextUtils;
35import android.text.format.DateFormat;
36import android.transition.ChangeBounds;
37import android.transition.ChangeText;
38import android.transition.Fade;
39import android.transition.TransitionManager;
40import android.transition.TransitionSet;
41import android.util.AttributeSet;
42import android.util.DisplayMetrics;
43import android.util.Log;
44import android.view.KeyEvent;
45import android.view.View;
46import android.view.ViewGroup;
47import android.widget.FrameLayout;
48import android.widget.ImageView;
49import android.widget.SeekBar;
50import android.widget.TextView;
51
52import java.text.SimpleDateFormat;
53import java.util.Date;
54import java.util.TimeZone;
55
56/**
57 * This is the widget responsible for showing music controls in keyguard.
58 */
59public class KeyguardTransportControlView extends FrameLayout {
60
61    private static final int DISPLAY_TIMEOUT_MS = 5000; // 5s
62    private static final int RESET_TO_METADATA_DELAY = 5000;
63    protected static final boolean DEBUG = false;
64    protected static final String TAG = "TransportControlView";
65
66    private static final boolean ANIMATE_TRANSITIONS = true;
67
68    private ViewGroup mMetadataContainer;
69    private ViewGroup mInfoContainer;
70    private TextView mTrackTitle;
71    private TextView mTrackArtistAlbum;
72
73    private View mTransientSeek;
74    private SeekBar mTransientSeekBar;
75    private TextView mTransientSeekTimeElapsed;
76    private TextView mTransientSeekTimeRemaining;
77
78    private ImageView mBtnPrev;
79    private ImageView mBtnPlay;
80    private ImageView mBtnNext;
81    private Metadata mMetadata = new Metadata();
82    private int mTransportControlFlags;
83    private int mCurrentPlayState;
84    private AudioManager mAudioManager;
85    private RemoteController mRemoteController;
86
87    private int MARQUEE_VIEWS[] = { R.id.title, R.id.artist_album };
88
89    private ImageView mBadge;
90
91    private boolean mSeekEnabled;
92    private boolean mUserSeeking;
93    private java.text.DateFormat mFormat;
94
95    /**
96     * The metadata which should be populated into the view once we've been attached
97     */
98    private RemoteController.MetadataEditor mPopulateMetadataWhenAttached = null;
99
100    private RemoteController.OnClientUpdateListener mRCClientUpdateListener =
101            new RemoteController.OnClientUpdateListener() {
102        @Override
103        public void onClientChange(boolean clearing) {
104            if (clearing) {
105                clearMetadata();
106            }
107        }
108
109        @Override
110        public void onClientPlaybackStateUpdate(int state) {
111            setSeekBarsEnabled(false);
112            updatePlayPauseState(state);
113        }
114
115        @Override
116        public void onClientPlaybackStateUpdate(int state, long stateChangeTimeMs,
117                long currentPosMs, float speed) {
118            setSeekBarsEnabled(mMetadata != null && mMetadata.duration > 0);
119            updatePlayPauseState(state);
120            if (DEBUG) Log.d(TAG, "onClientPlaybackStateUpdate(state=" + state +
121                    ", stateChangeTimeMs=" + stateChangeTimeMs + ", currentPosMs=" + currentPosMs +
122                    ", speed=" + speed + ")");
123        }
124
125        @Override
126        public void onClientTransportControlUpdate(int transportControlFlags) {
127            updateTransportControls(transportControlFlags);
128        }
129
130        @Override
131        public void onClientMetadataUpdate(RemoteController.MetadataEditor metadataEditor) {
132            updateMetadata(metadataEditor);
133        }
134    };
135
136    private final Runnable mUpdateSeekBars = new Runnable() {
137        public void run() {
138            if (updateSeekBars()) {
139                postDelayed(this, 1000);
140            }
141        }
142    };
143
144    private final Runnable mResetToMetadata = new Runnable() {
145        public void run() {
146            resetToMetadata();
147        }
148    };
149
150    private final OnClickListener mTransportCommandListener = new OnClickListener() {
151        public void onClick(View v) {
152            int keyCode = -1;
153            if (v == mBtnPrev) {
154                keyCode = KeyEvent.KEYCODE_MEDIA_PREVIOUS;
155            } else if (v == mBtnNext) {
156                keyCode = KeyEvent.KEYCODE_MEDIA_NEXT;
157            } else if (v == mBtnPlay) {
158                keyCode = KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE;
159            }
160            if (keyCode != -1) {
161                sendMediaButtonClick(keyCode);
162            }
163        }
164    };
165
166    private final OnLongClickListener mTransportShowSeekBarListener = new OnLongClickListener() {
167        @Override
168        public boolean onLongClick(View v) {
169            if (mSeekEnabled) {
170                return tryToggleSeekBar();
171            }
172            return false;
173        }
174    };
175
176    private final SeekBar.OnSeekBarChangeListener mOnSeekBarChangeListener =
177            new SeekBar.OnSeekBarChangeListener() {
178        @Override
179        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
180            if (fromUser) {
181                scrubTo(progress);
182                delayResetToMetadata();
183            }
184            updateSeekDisplay();
185        }
186
187        @Override
188        public void onStartTrackingTouch(SeekBar seekBar) {
189            mUserSeeking = true;
190        }
191
192        @Override
193        public void onStopTrackingTouch(SeekBar seekBar) {
194            mUserSeeking = false;
195        }
196    };
197
198    private static final int TRANSITION_DURATION = 200;
199    private final TransitionSet mMetadataChangeTransition;
200
201    KeyguardHostView.TransportControlCallback mTransportControlCallback;
202
203    private final KeyguardUpdateMonitorCallback mUpdateMonitor
204            = new KeyguardUpdateMonitorCallback() {
205        public void onScreenTurnedOff(int why) {
206            setEnableMarquee(false);
207        };
208        public void onScreenTurnedOn() {
209            setEnableMarquee(true);
210        };
211    };
212
213    public KeyguardTransportControlView(Context context, AttributeSet attrs) {
214        super(context, attrs);
215        if (DEBUG) Log.v(TAG, "Create TCV " + this);
216        mAudioManager = new AudioManager(mContext);
217        mCurrentPlayState = RemoteControlClient.PLAYSTATE_NONE; // until we get a callback
218        mRemoteController = new RemoteController(context, mRCClientUpdateListener);
219
220        final DisplayMetrics dm = context.getResources().getDisplayMetrics();
221        final int dim = Math.max(dm.widthPixels, dm.heightPixels);
222        mRemoteController.setArtworkConfiguration(true, dim, dim);
223
224        final ChangeText tc = new ChangeText();
225        tc.setChangeBehavior(ChangeText.CHANGE_BEHAVIOR_OUT_IN);
226        final TransitionSet inner = new TransitionSet();
227        inner.addTransition(tc).addTransition(new ChangeBounds());
228        final TransitionSet tg = new TransitionSet();
229        tg.addTransition(new Fade(Fade.OUT)).addTransition(inner).
230                addTransition(new Fade(Fade.IN));
231        tg.setOrdering(TransitionSet.ORDERING_SEQUENTIAL);
232        tg.setDuration(TRANSITION_DURATION);
233        mMetadataChangeTransition = tg;
234    }
235
236    private void updateTransportControls(int transportControlFlags) {
237        mTransportControlFlags = transportControlFlags;
238        setSeekBarsEnabled(
239                (transportControlFlags & RemoteControlClient.FLAG_KEY_MEDIA_POSITION_UPDATE) != 0);
240    }
241
242    void setSeekBarsEnabled(boolean enabled) {
243        if (enabled == mSeekEnabled) return;
244
245        mSeekEnabled = enabled;
246        if (mTransientSeek.getVisibility() == VISIBLE) {
247            mTransientSeek.setVisibility(INVISIBLE);
248            mMetadataContainer.setVisibility(VISIBLE);
249            mUserSeeking = false;
250            cancelResetToMetadata();
251        }
252        if (enabled) {
253            mUpdateSeekBars.run();
254            postDelayed(mUpdateSeekBars, 1000);
255        } else {
256            removeCallbacks(mUpdateSeekBars);
257        }
258    }
259
260    public void setTransportControlCallback(KeyguardHostView.TransportControlCallback
261            transportControlCallback) {
262        mTransportControlCallback = transportControlCallback;
263    }
264
265    private void setEnableMarquee(boolean enabled) {
266        if (DEBUG) Log.v(TAG, (enabled ? "Enable" : "Disable") + " transport text marquee");
267        for (int i = 0; i < MARQUEE_VIEWS.length; i++) {
268            View v = findViewById(MARQUEE_VIEWS[i]);
269            if (v != null) {
270                v.setSelected(enabled);
271            }
272        }
273    }
274
275    @Override
276    public void onFinishInflate() {
277        super.onFinishInflate();
278        mInfoContainer = (ViewGroup) findViewById(R.id.info_container);
279        mMetadataContainer = (ViewGroup) findViewById(R.id.metadata_container);
280        mBadge = (ImageView) findViewById(R.id.badge);
281        mTrackTitle = (TextView) findViewById(R.id.title);
282        mTrackArtistAlbum = (TextView) findViewById(R.id.artist_album);
283        mTransientSeek = findViewById(R.id.transient_seek);
284        mTransientSeekBar = (SeekBar) findViewById(R.id.transient_seek_bar);
285        mTransientSeekBar.setOnSeekBarChangeListener(mOnSeekBarChangeListener);
286        mTransientSeekTimeElapsed = (TextView) findViewById(R.id.transient_seek_time_elapsed);
287        mTransientSeekTimeRemaining = (TextView) findViewById(R.id.transient_seek_time_remaining);
288        mBtnPrev = (ImageView) findViewById(R.id.btn_prev);
289        mBtnPlay = (ImageView) findViewById(R.id.btn_play);
290        mBtnNext = (ImageView) findViewById(R.id.btn_next);
291        final View buttons[] = { mBtnPrev, mBtnPlay, mBtnNext };
292        for (View view : buttons) {
293            view.setOnClickListener(mTransportCommandListener);
294            view.setOnLongClickListener(mTransportShowSeekBarListener);
295        }
296        final boolean screenOn = KeyguardUpdateMonitor.getInstance(mContext).isScreenOn();
297        setEnableMarquee(screenOn);
298    }
299
300    @Override
301    public void onAttachedToWindow() {
302        super.onAttachedToWindow();
303        if (DEBUG) Log.v(TAG, "onAttachToWindow()");
304        if (mPopulateMetadataWhenAttached != null) {
305            updateMetadata(mPopulateMetadataWhenAttached);
306            mPopulateMetadataWhenAttached = null;
307        }
308        if (DEBUG) Log.v(TAG, "Registering TCV " + this);
309        mAudioManager.registerRemoteController(mRemoteController);
310        KeyguardUpdateMonitor.getInstance(mContext).registerCallback(mUpdateMonitor);
311    }
312
313    @Override
314    protected void onConfigurationChanged(Configuration newConfig) {
315        super.onConfigurationChanged(newConfig);
316        final DisplayMetrics dm = getContext().getResources().getDisplayMetrics();
317        final int dim = Math.max(dm.widthPixels, dm.heightPixels);
318        mRemoteController.setArtworkConfiguration(true, dim, dim);
319    }
320
321    @Override
322    public void onDetachedFromWindow() {
323        if (DEBUG) Log.v(TAG, "onDetachFromWindow()");
324        super.onDetachedFromWindow();
325        if (DEBUG) Log.v(TAG, "Unregistering TCV " + this);
326        mAudioManager.unregisterRemoteController(mRemoteController);
327        KeyguardUpdateMonitor.getInstance(mContext).removeCallback(mUpdateMonitor);
328        mUserSeeking = false;
329    }
330
331    void setBadgeIcon(Drawable bmp) {
332        mBadge.setImageDrawable(bmp);
333
334        final ColorMatrix cm = new ColorMatrix();
335        cm.setSaturation(0);
336        mBadge.setColorFilter(new ColorMatrixColorFilter(cm));
337        mBadge.setImageAlpha(0xef);
338    }
339
340    class Metadata {
341        private String artist;
342        private String trackTitle;
343        private String albumTitle;
344        private Bitmap bitmap;
345        private long duration;
346
347        public void clear() {
348            artist = null;
349            trackTitle = null;
350            albumTitle = null;
351            bitmap = null;
352            duration = -1;
353        }
354
355        public String toString() {
356            return "Metadata[artist=" + artist + " trackTitle=" + trackTitle +
357                    " albumTitle=" + albumTitle + " duration=" + duration + "]";
358        }
359    }
360
361    void clearMetadata() {
362        mPopulateMetadataWhenAttached = null;
363        mMetadata.clear();
364        populateMetadata();
365    }
366
367    void updateMetadata(RemoteController.MetadataEditor data) {
368        if (isAttachedToWindow()) {
369            mMetadata.artist = data.getString(MediaMetadataRetriever.METADATA_KEY_ALBUMARTIST,
370                    mMetadata.artist);
371            mMetadata.trackTitle = data.getString(MediaMetadataRetriever.METADATA_KEY_TITLE,
372                    mMetadata.trackTitle);
373            mMetadata.albumTitle = data.getString(MediaMetadataRetriever.METADATA_KEY_ALBUM,
374                    mMetadata.albumTitle);
375            mMetadata.duration = data.getLong(MediaMetadataRetriever.METADATA_KEY_DURATION, -1);
376            mMetadata.bitmap = data.getBitmap(MediaMetadataEditor.BITMAP_KEY_ARTWORK,
377                    mMetadata.bitmap);
378            populateMetadata();
379        } else {
380            mPopulateMetadataWhenAttached = data;
381        }
382    }
383
384    /**
385     * Populates the given metadata into the view
386     */
387    private void populateMetadata() {
388        if (ANIMATE_TRANSITIONS && isLaidOut() && mMetadataContainer.getVisibility() == VISIBLE) {
389            TransitionManager.beginDelayedTransition(mMetadataContainer, mMetadataChangeTransition);
390        }
391
392        final String remoteClientPackage = mRemoteController.getRemoteControlClientPackageName();
393        Drawable badgeIcon = null;
394        try {
395            badgeIcon = getContext().getPackageManager().getApplicationIcon(remoteClientPackage);
396        } catch (PackageManager.NameNotFoundException e) {
397            Log.e(TAG, "Couldn't get remote control client package icon", e);
398        }
399        setBadgeIcon(badgeIcon);
400        if (!TextUtils.isEmpty(mMetadata.trackTitle)) {
401            mTrackTitle.setText(mMetadata.trackTitle);
402        }
403        StringBuilder sb = new StringBuilder();
404        if (!TextUtils.isEmpty(mMetadata.artist)) {
405            if (sb.length() != 0) {
406                sb.append(" - ");
407            }
408            sb.append(mMetadata.artist);
409        }
410        if (!TextUtils.isEmpty(mMetadata.albumTitle)) {
411            if (sb.length() != 0) {
412                sb.append(" - ");
413            }
414            sb.append(mMetadata.albumTitle);
415        }
416        mTrackArtistAlbum.setText(sb.toString());
417
418        if (mMetadata.duration >= 0) {
419            setSeekBarsEnabled(true);
420            setSeekBarDuration(mMetadata.duration);
421
422            final String skeleton;
423
424            if (mMetadata.duration >= 86400000) {
425                skeleton = "DDD kk mm ss";
426            } else if (mMetadata.duration >= 3600000) {
427                skeleton = "kk mm ss";
428            } else {
429                skeleton = "mm ss";
430            }
431            mFormat = new SimpleDateFormat(DateFormat.getBestDateTimePattern(
432                    getContext().getResources().getConfiguration().locale,
433                    skeleton));
434            mFormat.setTimeZone(TimeZone.getTimeZone("GMT+0"));
435        } else {
436            setSeekBarsEnabled(false);
437        }
438
439        KeyguardUpdateMonitor.getInstance(getContext()).dispatchSetBackground(
440                mMetadata.bitmap);
441        final int flags = mTransportControlFlags;
442        setVisibilityBasedOnFlag(mBtnPrev, flags, RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS);
443        setVisibilityBasedOnFlag(mBtnNext, flags, RemoteControlClient.FLAG_KEY_MEDIA_NEXT);
444        setVisibilityBasedOnFlag(mBtnPlay, flags,
445                RemoteControlClient.FLAG_KEY_MEDIA_PLAY
446                | RemoteControlClient.FLAG_KEY_MEDIA_PAUSE
447                | RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE
448                | RemoteControlClient.FLAG_KEY_MEDIA_STOP);
449
450        updatePlayPauseState(mCurrentPlayState);
451    }
452
453    void updateSeekDisplay() {
454        if (mMetadata != null && mRemoteController != null && mFormat != null) {
455            final long timeElapsed = mRemoteController.getEstimatedMediaPosition();
456            final long duration = mMetadata.duration;
457            final long remaining = duration - timeElapsed;
458
459            mTransientSeekTimeElapsed.setText(mFormat.format(new Date(timeElapsed)));
460            mTransientSeekTimeRemaining.setText(mFormat.format(new Date(remaining)));
461
462            if (DEBUG) Log.d(TAG, "updateSeekDisplay timeElapsed=" + timeElapsed +
463                    " duration=" + duration + " remaining=" + remaining);
464        }
465    }
466
467    boolean tryToggleSeekBar() {
468        if (ANIMATE_TRANSITIONS) {
469            TransitionManager.beginDelayedTransition(mInfoContainer);
470        }
471        if (mTransientSeek.getVisibility() == VISIBLE) {
472            mTransientSeek.setVisibility(INVISIBLE);
473            mMetadataContainer.setVisibility(VISIBLE);
474            cancelResetToMetadata();
475        } else {
476            mTransientSeek.setVisibility(VISIBLE);
477            mMetadataContainer.setVisibility(INVISIBLE);
478            delayResetToMetadata();
479        }
480        mTransportControlCallback.userActivity();
481        return true;
482    }
483
484    void resetToMetadata() {
485        if (ANIMATE_TRANSITIONS) {
486            TransitionManager.beginDelayedTransition(mInfoContainer);
487        }
488        if (mTransientSeek.getVisibility() == VISIBLE) {
489            mTransientSeek.setVisibility(INVISIBLE);
490            mMetadataContainer.setVisibility(VISIBLE);
491        }
492        // TODO Also hide ratings, if applicable
493    }
494
495    void delayResetToMetadata() {
496        removeCallbacks(mResetToMetadata);
497        postDelayed(mResetToMetadata, RESET_TO_METADATA_DELAY);
498    }
499
500    void cancelResetToMetadata() {
501        removeCallbacks(mResetToMetadata);
502    }
503
504    void setSeekBarDuration(long duration) {
505        mTransientSeekBar.setMax((int) duration);
506    }
507
508    void scrubTo(int progress) {
509        mRemoteController.seekTo(progress);
510        mTransportControlCallback.userActivity();
511    }
512
513    private static void setVisibilityBasedOnFlag(View view, int flags, int flag) {
514        if ((flags & flag) != 0) {
515            view.setVisibility(View.VISIBLE);
516        } else {
517            view.setVisibility(View.GONE);
518        }
519    }
520
521    private void updatePlayPauseState(int state) {
522        if (DEBUG) Log.v(TAG,
523                "updatePlayPauseState(), old=" + mCurrentPlayState + ", state=" + state);
524        if (state == mCurrentPlayState) {
525            return;
526        }
527        final int imageResId;
528        final int imageDescId;
529        switch (state) {
530            case RemoteControlClient.PLAYSTATE_ERROR:
531                imageResId = R.drawable.stat_sys_warning;
532                // TODO use more specific image description string for warning, but here the "play"
533                //      message is still valid because this button triggers a play command.
534                imageDescId = R.string.keyguard_transport_play_description;
535                break;
536
537            case RemoteControlClient.PLAYSTATE_PLAYING:
538                imageResId = R.drawable.ic_media_pause;
539                imageDescId = R.string.keyguard_transport_pause_description;
540                if (mSeekEnabled) {
541                    postDelayed(mUpdateSeekBars, 1000);
542                }
543                break;
544
545            case RemoteControlClient.PLAYSTATE_BUFFERING:
546                imageResId = R.drawable.ic_media_stop;
547                imageDescId = R.string.keyguard_transport_stop_description;
548                break;
549
550            case RemoteControlClient.PLAYSTATE_PAUSED:
551            default:
552                imageResId = R.drawable.ic_media_play;
553                imageDescId = R.string.keyguard_transport_play_description;
554                break;
555        }
556
557        if (state != RemoteControlClient.PLAYSTATE_PLAYING) {
558            removeCallbacks(mUpdateSeekBars);
559            updateSeekBars();
560        }
561        mBtnPlay.setImageResource(imageResId);
562        mBtnPlay.setContentDescription(getResources().getString(imageDescId));
563        mCurrentPlayState = state;
564    }
565
566    boolean updateSeekBars() {
567        final int position = (int) mRemoteController.getEstimatedMediaPosition();
568        if (position >= 0) {
569            if (!mUserSeeking) {
570                mTransientSeekBar.setProgress(position);
571            }
572            return true;
573        }
574        Log.w(TAG, "Updating seek bars; received invalid estimated media position (" +
575                position + "). Disabling seek.");
576        setSeekBarsEnabled(false);
577        return false;
578    }
579
580    static class SavedState extends BaseSavedState {
581        boolean clientPresent;
582
583        SavedState(Parcelable superState) {
584            super(superState);
585        }
586
587        private SavedState(Parcel in) {
588            super(in);
589            this.clientPresent = in.readInt() != 0;
590        }
591
592        @Override
593        public void writeToParcel(Parcel out, int flags) {
594            super.writeToParcel(out, flags);
595            out.writeInt(this.clientPresent ? 1 : 0);
596        }
597
598        public static final Parcelable.Creator<SavedState> CREATOR
599                = new Parcelable.Creator<SavedState>() {
600            public SavedState createFromParcel(Parcel in) {
601                return new SavedState(in);
602            }
603
604            public SavedState[] newArray(int size) {
605                return new SavedState[size];
606            }
607        };
608    }
609
610    private void sendMediaButtonClick(int keyCode) {
611        // TODO We should think about sending these up/down events accurately with touch up/down
612        // on the buttons, but in the near term this will interfere with the long press behavior.
613        mRemoteController.sendMediaKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, keyCode));
614        mRemoteController.sendMediaKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, keyCode));
615
616        mTransportControlCallback.userActivity();
617    }
618
619    public boolean providesClock() {
620        return false;
621    }
622
623    private boolean wasPlayingRecently(int state, long stateChangeTimeMs) {
624        switch (state) {
625            case RemoteControlClient.PLAYSTATE_PLAYING:
626            case RemoteControlClient.PLAYSTATE_FAST_FORWARDING:
627            case RemoteControlClient.PLAYSTATE_REWINDING:
628            case RemoteControlClient.PLAYSTATE_SKIPPING_FORWARDS:
629            case RemoteControlClient.PLAYSTATE_SKIPPING_BACKWARDS:
630            case RemoteControlClient.PLAYSTATE_BUFFERING:
631                // actively playing or about to play
632                return true;
633            case RemoteControlClient.PLAYSTATE_NONE:
634                return false;
635            case RemoteControlClient.PLAYSTATE_STOPPED:
636            case RemoteControlClient.PLAYSTATE_PAUSED:
637            case RemoteControlClient.PLAYSTATE_ERROR:
638                // we have stopped playing, check how long ago
639                if (DEBUG) {
640                    if ((SystemClock.elapsedRealtime() - stateChangeTimeMs) < DISPLAY_TIMEOUT_MS) {
641                        Log.v(TAG, "wasPlayingRecently: time < TIMEOUT was playing recently");
642                    } else {
643                        Log.v(TAG, "wasPlayingRecently: time > TIMEOUT");
644                    }
645                }
646                return ((SystemClock.elapsedRealtime() - stateChangeTimeMs) < DISPLAY_TIMEOUT_MS);
647            default:
648                Log.e(TAG, "Unknown playback state " + state + " in wasPlayingRecently()");
649                return false;
650        }
651    }
652}
653