我正在制作一个Android应用程序。这个应用程序的功能之一是从firebase读取音乐文件和播放音乐。现在，我正在尝试使用exoplayer来做到这一点。到目前为止，我能够创建一个可以播放给定链接音乐的简单播放器。它具有播放，暂停和搜索功能。现在我希望在我的通知栏上显示所有这些功能，以便我可以从那里控制它。如何实现这一目标。这是我的代码的示例示例：
public class MainActivity extends AppCompatActivity {
private SimpleExoPlayer exoPlayer;
private ExoPlayer.EventListener eventListener = new ExoPlayer.EventListener() {
@Override
public void onTimelineChanged(Timeline timeline, Object manifest) {
Log.i(TAG,"onTimelineChanged");
}
@Override
public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
Log.i(TAG,"onTracksChanged");
}
@Override
public void onLoadingChanged(boolean isLoading) {
Log.i(TAG,"onLoadingChanged");
}
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
Log.i(TAG,"onPlayerStateChanged: playWhenReady = "+String.valueOf(playWhenReady)
+" playbackState = "+playbackState);
switch (playbackState){
case ExoPlayer.STATE_ENDED:
Log.i(TAG,"Playback ended!");
//Stop playback and return to start position
setPlayPause(false);
exoPlayer.seekTo(0);
break;
case ExoPlayer.STATE_READY:
Log.i(TAG,"ExoPlayer ready! pos: "+exoPlayer.getCurrentPosition()
+" max: "+stringForTime((int)exoPlayer.getDuration()));
setProgress();
break;
case ExoPlayer.STATE_BUFFERING:
Log.i(TAG,"Playback buffering!");
break;
case ExoPlayer.STATE_IDLE:
Log.i(TAG,"ExoPlayer idle!");
break;
}
}
@Override
public void onPlayerError(ExoPlaybackException error) {
Log.i(TAG,"onPlaybackError: "+error.getMessage());
}
@Override
public void onPositionDiscontinuity() {
Log.i(TAG,"onPositionDiscontinuity");
}
};
private SeekBar seekPlayerProgress;
private Handler handler;
private ImageButton btnPlay;
private TextView txtCurrentTime, txtEndTime;
private boolean isPlaying = false;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
prepareExoPlayerFromURL(Uri.parse("https://firebasestorage.googleapis.com/v0/b/musyc-f264f.appspot.com/o/Karone-Okarone-Minar-Rahman-Official-Music-Video-Eagle-Music.mp3?alt=media&token=a40ed28a-2970-4160-ac1d-33881e34253a"));
}
private void prepareExoPlayerFromURL(Uri uri){
TrackSelector trackSelector = new DefaultTrackSelector();
LoadControl loadControl = new DefaultLoadControl();
exoPlayer = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "exoplayer2example"), null);
ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
MediaSource audioSource = new ExtractorMediaSource(uri, dataSourceFactory, extractorsFactory, null, null);
exoPlayer.addListener(eventListener);
exoPlayer.prepare(audioSource);
initMediaControls();
}
private void initMediaControls() {
initPlayButton();
initSeekBar();
initTxtTime();
}
private void initPlayButton() {
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
btnPlay.requestFocus();
btnPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
setPlayPause(!isPlaying);
}
});
}
/**
* Starts or stops playback. Also takes care of the Play/Pause button toggling
* @param play True if playback should be started
*/
private void setPlayPause(boolean play){
isPlaying = play;
exoPlayer.setPlayWhenReady(play);
if(!isPlaying){
btnPlay.setImageResource(android.R.drawable.ic_media_play);
}else{
setProgress();
btnPlay.setImageResource(android.R.drawable.ic_media_pause);
}
}
private void initTxtTime() {
txtCurrentTime = (TextView) findViewById(R.id.time_current);
txtEndTime = (TextView) findViewById(R.id.player_end_time);
}
private String stringForTime(int timeMs) {
StringBuilder mFormatBuilder;
Formatter mFormatter;
mFormatBuilder = new StringBuilder();
mFormatter = new Formatter(mFormatBuilder, Locale.getDefault());
int totalSeconds = timeMs / 1000;
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
int hours = totalSeconds / 3600;
mFormatBuilder.setLength(0);
if (hours > 0) {
return mFormatter.format("%d:%02d:%02d", hours, minutes, seconds).toString();
} else {
return mFormatter.format("%02d:%02d", minutes, seconds).toString();
}
}
private void setProgress() {
seekPlayerProgress.setProgress(0);
seekPlayerProgress.setMax((int) exoPlayer.getDuration()/1000);
txtCurrentTime.setText(stringForTime((int)exoPlayer.getCurrentPosition()));
txtEndTime.setText(stringForTime((int)exoPlayer.getDuration()));
if(handler == null)handler = new Handler();
//Make sure you update Seekbar on UI thread
handler.post(new Runnable() {
@Override
public void run() {
if (exoPlayer != null && isPlaying) {
seekPlayerProgress.setMax((int) exoPlayer.getDuration()/1000);
int mCurrentPosition = (int) exoPlayer.getCurrentPosition() / 1000;
seekPlayerProgress.setProgress(mCurrentPosition);
txtCurrentTime.setText(stringForTime((int)exoPlayer.getCurrentPosition()));
txtEndTime.setText(stringForTime((int)exoPlayer.getDuration()));
handler.postDelayed(this, 1000);
}
}
});
}
private void initSeekBar() {
seekPlayerProgress = (SeekBar) findViewById(R.id.mediacontroller_progress);
seekPlayerProgress.requestFocus();
seekPlayerProgress.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (!fromUser) {
// We're not interested in programmatically generated changes to
// the progress bar's position.
return;
}
exoPlayer.seekTo(progress*1000);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
seekPlayerProgress.setMax(0);
seekPlayerProgress.setMax((int) exoPlayer.getDuration()/1000);
}
}
static RemoteViews notificationView;
static Notification notification;
static NotificationManager notificationManager;
private void startNotification() {
String ns = Context.NOTIFICATION_SERVICE;
notificationManager = (NotificationManager) getSystemService(ns);
notification = new Notification(R.mipmap.ic_launcher, null, System.currentTimeMillis());
notificationView = new RemoteViews(getPackageName(), R.layout.mynotification);
if (isPlaying) {
notificationView.setInt(R.id.closeOnFlash, "setBackgroundResource", R.drawable.pausecontrol);
notificationView.setViewVisibility(R.id.delete, View.GONE);
} else {
notificationView.setViewVisibility(R.id.delete, View.VISIBLE);
notificationView.setInt(R.id.closeOnFlash, "setBackgroundResource", R.drawable.playcontrol);
}
notificationView.setTextViewText(R.id.appName, "Testing......");
//the intent that is started when the notification is clicked (works)
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingNotificationIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
editor = preferences.edit();
editor.putString("play", "notify");
editor.apply();
notification.contentView = notificationView;
notification.contentIntent = pendingNotificationIntent;
notification.flags |= Notification.FLAG_NO_CLEAR;
//this is the intent that is supposed to be called when the
//button is clicked
Intent intentPlay = new Intent(this, switchButtonListener.class);
notificationView.setOnClickPendingIntent(R.id.closeOnFlash, getPendingSelfIntent(this, "play", intentPlay));
notificationView.setOnClickPendingIntent(R.id.delete, getPendingSelfIntent(this, "delete", intentPlay));
notificationManager.notify(1, notification);
}
public static class switchButtonListener extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("play")) {
if (exoPlayer.getPlayWhenReady()) {
exoPlayer.setPlayWhenReady(false);
btnPlay.setImageResource(android.R.drawable.ic_media_play);
notificationView.setViewVisibility(R.id.delete, View.VISIBLE);
notificationView.setInt(R.id.closeOnFlash, "setBackgroundResource", R.drawable.playcontrol);
notificationManager.notify(1, notification);
} else {
exoPlayer.setPlayWhenReady(true);
btnPlay.setImageResource(android.R.drawable.ic_media_pause);
notificationView.setViewVisibility(R.id.delete, View.GONE);
notificationView.setInt(R.id.closeOnFlash, "setBackgroundResource", R.drawable.pausecontrol);
notificationManager.notify(1, notification);
}
} else {
Log.e("yes..", "worlinggggggggg");
notificationManager.cancelAll();
}
}
}
protected PendingIntent getPendingSelfIntent(Context context, String action, Intent intent) {
intent.setAction(action);
return PendingIntent.getBroadcast(context, 0, intent, 0);
}`enter code here`
它对我有用