我正在尝试使用MediaSessionCompat为我的应用添加锁屏播放器控件和元数据。我试过的一切都行不通。锁定屏幕在播放时不显示任何控件或元数据。请参阅下面的当前代码，我们非常感谢您的帮助。
StreamService.java：
public class StreamService extends Service implements MediaPlayer.OnCuePointReceivedListener, MediaPlayer.OnStateChangedListener,
MediaPlayer.OnInfoListener, AudioManager.OnAudioFocusChangeListener {
private WifiManager.WifiLock wifiLock;
private static String LOG_TAG = "StreamService";
public static final String BROADCAST_PLAYER_STATE = "com.test.BROADCAST_PLAYER_STATE";
public static final String BROADCAST_PLAYER_META = "com.test.BROADCAST_PLAYER_META";
public static final String BROADCAST_PLAYER_ALBUM = "com.test.BROADCAST_PLAYER_ALBUM";
public static final int NOTIFICATION_ID = 999999;
private MediaSessionCompat mediaSession;
private boolean audioInterrupted = false;
public StreamService() {
}
@Override
public void onCreate(){
super.onCreate();
setupMediaPlayer();
setupMediaSession();
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public boolean onUnbind(Intent intent){
releasePlayer();
return false;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return START_NOT_STICKY;
}
private void setupMediaPlayer() {
// Recreate player
Bundle playerSettings = (BrandedApplication.getContext().getmTritonPlayer() == null) ? null : BrandedApplication.getContext().getmTritonPlayer().getSettings();
Bundle inputSettings = createPlayerSettings();
if (!Utility.bundleEquals(inputSettings, playerSettings)) {
releasePlayer();
createPlayer(inputSettings);
}
// Start the playback
play();
}
private void setupMediaSession() {
ComponentName receiver = new ComponentName(getPackageName(), RemoteReceiver.class.getName());
mediaSession = new MediaSessionCompat(this, "StreamService", receiver, null);
mediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_MEDIA_BUTTONS |
MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
.setState(PlaybackStateCompat.STATE_PAUSED, 0, 0)
.setActions(PlaybackStateCompat.ACTION_PLAY_PAUSE | PlaybackStateCompat.ACTION_PLAY | PlaybackStateCompat.ACTION_PAUSE)
.build());
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, "Test Artist")
.putString(MediaMetadataCompat.METADATA_KEY_ALBUM, "Test Album")
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, "Test Track Name")
.putLong(MediaMetadataCompat.METADATA_KEY_DURATION, 10000)
.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART,
BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
//.putString(MediaMetadataCompat.METADATA_KEY_DISPLAY_TITLE, "Test Artist")
.build());
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.requestAudioFocus(new AudioManager.OnAudioFocusChangeListener() {
@Override
public void onAudioFocusChange(int focusChange) {
// Ignore
}
}, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
mediaSession.setActive(true);
}
synchronized private void play() {
audioInterrupted = false;
BrandedApplication.getContext().getmTritonPlayer().play();
if(wifiLock != null) {
wifiLock.acquire();
}
if(mediaSession != null) {
mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
.setState(PlaybackStateCompat.STATE_PLAYING, 0, 1.0f)
.setActions(PlaybackStateCompat.ACTION_PLAY_PAUSE).build());
}
}
synchronized private void stop() {
BrandedApplication.getContext().getmTritonPlayer().stop();
if(wifiLock != null) {
wifiLock.release();
}
if(mediaSession != null) {
mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
.setState(PlaybackStateCompat.STATE_PAUSED, 0, 0.0f)
.setActions(PlaybackStateCompat.ACTION_PLAY_PAUSE).build());
}
}
private void createPlayer(Bundle settings)
{
BrandedApplication.getContext().setmTritonPlayer(new TritonPlayer(this, settings));
wifiLock = ((WifiManager) getSystemService(Context.WIFI_SERVICE))
.createWifiLock(WifiManager.WIFI_MODE_FULL, "mylock");
AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
int result = audioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC,
AudioManager.AUDIOFOCUS_GAIN);
BrandedApplication.getContext().getmTritonPlayer().setOnCuePointReceivedListener(this);
BrandedApplication.getContext().getmTritonPlayer().setOnInfoListener(this);
BrandedApplication.getContext().getmTritonPlayer().setOnStateChangedListener(this);
}
protected void releasePlayer() {
if (BrandedApplication.getContext().getmTritonPlayer() != null) {
if(BrandedApplication.getContext().isPlaying()) {
stop();
}
BrandedApplication.getContext().getmTritonPlayer().release();
BrandedApplication.getContext().setmTritonPlayer(null);
}
stopForeground(true);
}
protected Bundle createPlayerSettings() {
// Player Settings
Bundle settings = new Bundle();
// AAC
settings.putString(TritonPlayer.SETTINGS_STATION_MOUNT, getResources().getString(R.string.station_stream_mount) + "AAC");
// MP3
//settings.putString(TritonPlayer.SETTINGS_STATION_MOUNT, mountID);
settings.putString(TritonPlayer.SETTINGS_STATION_BROADCASTER, getResources().getString(R.string.app_name));
settings.putString(TritonPlayer.SETTINGS_STATION_NAME, getResources().getString(R.string.app_name));
return settings;
}
@Override
public void onCuePointReceived(MediaPlayer mediaPlayer, Bundle bundle) {
//System.out.println("TRITON PLAYER BUNDLE " + bundle);
String trackName = "";
String artistName = "";
if(bundle != null) {
if(bundle.containsKey("cue_title") && bundle.containsKey("track_artist_name")) {
if (!bundle.getString("cue_title").isEmpty()) {
trackName = bundle.getString("cue_title");
}
if (!bundle.getString("track_artist_name").isEmpty()) {
artistName = bundle.getString("track_artist_name");
}
}
}
// broadcast out the meta data
Intent i = new Intent(BROADCAST_PLAYER_META);
i.putExtra("trackName", trackName);
i.putExtra("artistName", artistName);
sendBroadcast(i);
// send notification and start as foreground service
PendingIntent pi = PendingIntent.getActivity(getApplicationContext(), 0, new Intent(getApplicationContext(), MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
Bitmap icon = BitmapFactory.decodeResource(getResources(),
R.drawable.logo);
String tickerString = "";
String contentString = "Playing";
if(!artistName.isEmpty() && !trackName.isEmpty()) {
tickerString = artistName + " - " + trackName;
contentString += ": " + artistName + " - " + trackName;
}
Intent pauseIntent = new Intent(BROADCAST_PLAYER_PAUSE);
PendingIntent pausePendingIntent = PendingIntent.getBroadcast(this, 0, pauseIntent, 0);
NotificationCompat.Builder notification = new NotificationCompat.Builder(this)
.setContentTitle(getResources().getString(R.string.app_name))
.setTicker(tickerString)
.setContentText(contentString)
.setSmallIcon(R.drawable.ic_launcher)
//.setAutoCancel(true)
//.setLargeIcon(
// Bitmap.createScaledBitmap(icon, 128, 128, false))
.addAction(R.drawable.ic_media_pause, "Pause", pausePendingIntent)
.setContentIntent(pi)
.setStyle(new android.support.v7.app.NotificationCompat.MediaStyle()
//.setShowActionsInCompactView(0)
.setMediaSession(mediaSession.getSessionToken()))
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.setOngoing(true);
//notification.setPriority(Notification.PRIORITY_MIN);
notification.setPriority(Notification.PRIORITY_DEFAULT);
startForeground(NOTIFICATION_ID, notification.build());
}
@Override
public void onInfo(MediaPlayer mediaPlayer, int i, int i1) {
}
@Override
public void onStateChanged(MediaPlayer mediaPlayer, int state) {
Log.i(LOG_TAG, "onStateChanged: " + TritonPlayer.debugStateToStr(state));
// broadcast out the player state
Intent i = new Intent(BROADCAST_PLAYER_STATE);
i.putExtra("state", state);
sendBroadcast(i);
}
@Override
public void onAudioFocusChange(int focusChange) {
switch (focusChange) {
case AudioManager.AUDIOFOCUS_GAIN:
// resume playback
System.out.println("AUDIO FOCUS GAIN");
if(audioInterrupted) {
audioInterrupted = false;
if (BrandedApplication.getContext().getmTritonPlayer() == null) {
setupMediaPlayer();
} else if (!BrandedApplication.getContext().isPlaying()) {
setupMediaPlayer();
}
}
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
case AudioManager.AUDIOFOCUS_LOSS:
System.out.println("AUDIO FOCUS LOSS");
// Lost focus for an unbounded amount of time: stop playback and release media player
if (BrandedApplication.getContext().isPlaying()) {
audioInterrupted = true;
releasePlayer();
}
break;
}
}
@Override
public void onDestroy() {
System.out.println("SERVICE STOPPED");
releasePlayer();
mediaSession.release();
}
}
这是RemoteReceiver.java：
public class RemoteReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
final KeyEvent event = intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if (event != null && event.getAction() == KeyEvent.ACTION_DOWN) {
switch (event.getKeyCode()) {
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
context.startService(new Intent(context, StreamService.class));
break;
}
}
}
}
}
答案 0 :(得分：3)
好的，根据您提供的其他信息，我相信我知道问题所在。在Android 5.0中，锁定屏幕控件已被删除。它们现在通过Notification API实现。因此，请尝试将以下内容添加到通知构建器中。
notification.setStyle(new NotificationCompat.MediaStyle()
.setShowActionsInCompactView(0)
.setMediaSession(mediaSession));
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
应将它放在锁定屏幕上。我还建议您更改Notification.PRIORITY_DEFAULT以及在通知中添加操作，否则您将无法控制播放。
答案 1 :(得分：0)
我知道这篇文章很晚但是如果有人仍然面临这个问题。这也会出现在你的锁定屏幕上。
以下是通知构建器类的代码 -
import android.annotation.SuppressLint;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.media.MediaPlayer;
import android.media.session.MediaSessionManager;
import android.os.Build;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.annotation.RequiresApi;
import android.support.v4.app.NotificationCompat;
import android.support.v4.media.session.MediaControllerCompat;
import android.support.v4.media.session.MediaSessionCompat;
import android.util.Log;
import org.json.JSONException;
public class MediaPlayerService extends Service {
private static final String CHANNEL_ID = "my_channel_01";
public static final String ACTION_PLAY = "action_play";
public static final String ACTION_PAUSE = "action_pause";
public static final String ACTION_NEXT = "action_next";
public static final String ACTION_PREVIOUS = "action_previous";
public static final String ACTION_STOP = "action_stop";
public static final String ACTION_NOTHING = "action_previous";
private NotificationManager notificationManager;
NotificationManager mNotificationManager;
private MediaPlayer mMediaPlayer;
private MediaSessionManager mManager;
private MediaSessionCompat mSession;
private MediaControllerCompat mController;
private MediaPlayerService mService;
String title = null;
String description = null;
@Override
public IBinder onBind(Intent intent) {
return null;
}
private void handleIntent(Intent intent) {
if (intent == null || intent.getAction() == null)
return;
String action = intent.getAction();
if (action.equalsIgnoreCase(ACTION_PLAY)) {
mController.getTransportControls().play();
} else if (action.equalsIgnoreCase(ACTION_PAUSE)) {
mController.getTransportControls().pause();
} else if (action.equalsIgnoreCase(ACTION_PREVIOUS)) {
mController.getTransportControls().skipToPrevious();
} else if (action.equalsIgnoreCase(ACTION_NEXT)) {
mController.getTransportControls().skipToNext();
} else if (action.equalsIgnoreCase(ACTION_STOP)) {
mController.getTransportControls().stop();
}
}
private NotificationCompat.Action generateAction(int icon, String title, String intentAction) {
Intent intent = new Intent(getApplicationContext(), MediaPlayerService.class);
intent.setAction(intentAction);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
return new NotificationCompat.Action.Builder(icon, title, pendingIntent).build();
}
@SuppressLint("ServiceCast")
private void buildNotification(NotificationCompat.Action action) {
title = ""; // add variable to get current playing song title here
description =""; // add variable to get current playing song description here
Intent notificationIntent = new Intent(getApplicationContext(), HomeActivity.class); //specify which activity should be opened when widget is clicked (other than buttons)
PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent, 0);
notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// Notification channels are only supported on Android O+.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
//method to create channel if android version is android. Descrition below
createNotificationChannel();
}
Intent intent = new Intent(getApplicationContext(), MediaPlayerService.class);
intent.setAction(ACTION_STOP);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
final NotificationCompat.Builder builder;
//condition to check if music is playing
//if music is playing widget cant be dismissed on swipe
if(<add your method to check play status here>)
{
builder = new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.logo2b)
.setLargeIcon(BitmapFactory.decodeResource(getApplication().getResources(), R.mipmap.ic_launcher))
.setContentTitle(title)
.setContentText(description)
.setDeleteIntent(pendingIntent)
.setContentIntent(contentIntent)
.setChannelId(CHANNEL_ID)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.setOnlyAlertOnce(true)
.setColor(getResources().getColor(R.color.colorPrimary))
.setOngoing(true) //set this to true if music is playing widget cant be dismissed on swipe
.setStyle(new android.support.v4.media.app.NotificationCompat.MediaStyle()
// show only play/pause in compact view
.setShowActionsInCompactView(0, 1, 2));
}
//else if music is not playing widget can be dismissed on swipe
else
{
builder = new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.logo2b)
.setLargeIcon(BitmapFactory.decodeResource(getApplication().getResources(), R.mipmap.ic_launcher))
.setContentTitle(title)
.setContentText(description)
.setDeleteIntent(pendingIntent)
.setContentIntent(contentIntent)
.setChannelId(CHANNEL_ID)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.setOnlyAlertOnce(true)
.setColor(getResources().getColor(R.color.colorPrimary))
.setStyle(new android.support.v4.media.app.NotificationCompat.MediaStyle()
// show only play/pause in compact view
.setShowActionsInCompactView(0, 1, 2));
}
builder.addAction(generateAction(R.drawable.ic_skip_previous_white_24dp, "Previous", ACTION_PREVIOUS));
builder.addAction(action);
builder.addAction(generateAction(R.drawable.ic_skip_next_white_24dp, "Next", ACTION_NEXT));
//style.setShowActionsInCompactView(0,1,2);
// builder.setColor(getResources().getColor(R.color.app_orange_color));
notificationManager.notify(1, builder.build());
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (mManager == null) {
try {
initMediaSessions();
} catch (RemoteException e) {
e.printStackTrace();
}
}
handleIntent(intent);
return super.onStartCommand(intent, flags, startId);
}
private void initMediaSessions() throws RemoteException {
mMediaPlayer = new MediaPlayer();
mSession = new MediaSessionCompat(getApplicationContext(), "simple player session");
mController = new MediaControllerCompat(getApplicationContext(), mSession.getSessionToken());
mSession.setCallback(new MediaSessionCompat.Callback() {
@Override
public void onPlay() {
super.onPlay();
//add you code for play button click here
//replace your drawable id that shows pauseicon buildNotification(generateAction(R.drawable.uamp_ic_pause_white_24dp, "Pause", ACTION_PAUSE));
}
@Override
public void onPause() {
super.onPause();
//add you code for pause button click here
//replace your drawable id that shows play icon buildNotification(generateAction(R.drawable.uamp_ic_play_arrow_white_24dp, "Play", ACTION_PLAY));
}
@Override
public void onSkipToNext() {
super.onSkipToNext();
//add you code for next button click here
buildNotification(generateAction(R.drawable.uamp_ic_pause_white_24dp, "Pause", ACTION_PAUSE));
}
@Override
public void onSkipToPrevious() {
super.onSkipToPrevious();
//add you code for previous button click here
buildNotification(generateAction(R.drawable.uamp_ic_pause_white_24dp, "Pause", ACTION_PAUSE));
}
@Override
public void onStop() {
super.onStop();
Log.e("MediaPlayerService", "onStop");
//Stop media player and dismiss widget here
NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancel(1);
Intent intent = new Intent(getApplicationContext(), MediaPlayerService.class);
stopService(intent);
}
@Override
public void onSeekTo(long pos) {
super.onSeekTo(pos);
}
}
);
}
@Override
public boolean onUnbind(Intent intent) {
mSession.release();
return super.onUnbind(intent);
}
//method to create notification channel on android Oreo and above
@RequiresApi(Build.VERSION_CODES.O)
private void createNotificationChannel() {
int notifyID = 1;
CharSequence name = "Player Widget";// The user-visible name of the channel. This channel name will be shown in settings.
if (notificationManager.getNotificationChannel(CHANNEL_ID) == null) {
NotificationChannel notificationChannel =
new NotificationChannel(CHANNEL_ID, name, NotificationManager.IMPORTANCE_LOW);
notificationManager.createNotificationChannel(notificationChannel);
}
}
}
当应用程序中的播放状态发生变化时，触发这些意图以更新小部件：
播放 -
//to change widgets current action button to play
Intent intent = new Intent(getApplicationContext(), MediaPlayerService.class);
intent.setAction(MediaPlayerService.ACTION_PAUSE);
startService(intent);
暂停 -
//to change widgets current action button to pause
Intent intent = new Intent(getApplicationContext(), MediaPlayerService.class);
intent.setAction(MediaPlayerService.ACTION_PLAY);
startService(intent);
如果有任何不需要的导入，请原谅。一切顺利。