你好，朋友，我正在创建mp3播放器，我的mp3正常工作，其所有功能（例如播放下一个和以后的播放提示）都可以，但是我无法通过此服务控制我的服务类，我只想播放和暂停服务通知状态，但无法执行此任务我遇到了这个问题，因此在android开发中还是初学者，请帮助我如何暂停和播放音乐播放器 这是我的服务等级代码
package music.playerforandroid;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.Rating;
import android.media.session.MediaController;
import android.media.session.MediaSession;
import android.media.session.MediaSessionManager;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
/**
* Created by paulruiz on 10/28/14.
*/
public class MediaPlayerService extends Service {
public static final String ACTION_PLAY = "action_play";
public static final String ACTION_PAUSE = "action_pause";
public static final String ACTION_REWIND = "action_rewind";
public static final String ACTION_FAST_FORWARD = "action_fast_foward";
public static final String ACTION_NEXT = "action_next";
public static final String ACTION_PREVIOUS = "action_previous";
public static final String ACTION_STOP = "action_stop";
private MediaPlayer mMediaPlayer;
private MediaSessionManager mManager;
private MediaSession mSession;
private MediaController mController;
@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_FAST_FORWARD ) ) {
mController.getTransportControls().fastForward();
} else if( action.equalsIgnoreCase( ACTION_REWIND ) ) {
mController.getTransportControls().rewind();
} 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 Notification.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 Notification.Action.Builder( icon, title, pendingIntent ).build();
}
private void buildNotification( Notification.Action action ) {
Notification.MediaStyle style = new Notification.MediaStyle();
Intent intent = new Intent( getApplicationContext(), MediaPlayerService.class );
intent.setAction( ACTION_STOP );
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
Notification.Builder builder = new Notification.Builder( this )
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle( "Media Title" )
.setContentText( "Media Artist" )
.setDeleteIntent( pendingIntent )
.setStyle(style);
builder.addAction( generateAction( android.R.drawable.ic_media_previous, "Previous", ACTION_PREVIOUS ) );
builder.addAction( generateAction( android.R.drawable.ic_media_rew, "Rewind", ACTION_REWIND ) );
builder.addAction( action );
builder.addAction( generateAction( android.R.drawable.ic_media_ff, "Fast Foward", ACTION_FAST_FORWARD ) );
builder.addAction( generateAction( android.R.drawable.ic_media_next, "Next", ACTION_NEXT ) );
style.setShowActionsInCompactView(0,1,2,3,4);
NotificationManager notificationManager = (NotificationManager) getSystemService( Context.NOTIFICATION_SERVICE );
notificationManager.notify( 1, builder.build() );
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if( mManager == null ) {
initMediaSessions();
}
handleIntent( intent );
return super.onStartCommand(intent, flags, startId);
}
private void initMediaSessions() {
mMediaPlayer = new MediaPlayer();
mSession = new MediaSession(getApplicationContext(), "simple player session");
mController =new MediaController(getApplicationContext(), mSession.getSessionToken());
mSession.setCallback(new MediaSession.Callback(){
@Override
public void onPlay() {
super.onPlay();
Log.e( "MediaPlayerService", "onPlay");
buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
}
@Override
public void onPause() {
super.onPause();
Log.e( "MediaPlayerService", "onPause");
Toast.makeText(MediaPlayerService.this, "PAUSE", Toast.LENGTH_SHORT).show();
buildNotification(generateAction(android.R.drawable.ic_media_play, "Play", ACTION_PLAY));
}
@Override
public void onSkipToNext() {
super.onSkipToNext();
Log.e( "MediaPlayerService", "onSkipToNext");
//Change media here
buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
}
@Override
public void onSkipToPrevious() {
super.onSkipToPrevious();
Log.e( "MediaPlayerService", "onSkipToPrevious");
//Change media here
buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
}
@Override
public void onFastForward() {
super.onFastForward();
Log.e( "MediaPlayerService", "onFastForward");
//Manipulate current media here
}
@Override
public void onRewind() {
super.onRewind();
Log.e( "MediaPlayerService", "onRewind");
//Manipulate current media here
}
@Override
public void onStop() {
super.onStop();
Log.e( "MediaPlayerService", "onStop");
//Stop media player 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 void onSetRating(Rating rating) {
super.onSetRating(rating);
}
}
);
}
@Override
public boolean onUnbind(Intent intent) {
mSession.release();
return super.onUnbind(intent);
}
}