android – 一旦活动结束,就会调用onStartCommand服务

概述当我点击播放按钮播放歌曲并将歌曲mp3与它捆绑在一起并在onStartCommand中接收时,我开始服务.问题是当我启动服务的活动结束时,我的服务再次调用onStartCommand.当它接收该捆绑时它不存在,因为这次活动没有启动它.因此,我在准备媒体播放器时遇到了非法的例外情况.我没有约束我的服务. 为什么在我的活动结束时会调用onStartCommand？ 启动服务： Intent i = n 当我点击播放按钮播放歌曲并将歌曲mp3与它捆绑在一起并在onStartCommand中接收时,我开始服务.问题是当我启动服务的活动结束时,我的服务再次调用onStartCommand.当它接收该捆绑时它不存在,因为这次活动没有启动它.因此,我在准备媒体播放器时遇到了非法的例外情况.我没有约束我的服务.

为什么在我的活动结束时会调用onStartCommand？

启动服务：

Intent i = new Intent(SongList.this,MyService.class);i.putExtra("songURL",user.songurlz);i.putExtra("songname",songplay_name);startService(i);

服务类：

public class MyService extends Service {    static MediaPlayer mediaPlayer;    static int pauseplay;    static notificationmanager notificationmanagerPlay;    static CharSequence tickerText;    static Notification notification4;//Notification variable(for song playing)    TelephonyManager telephonyManager;    PhonestateListener Listener;    static Notification notification;    static notificationmanager mnotificationmanager;    String songurl;    String songname;    @OverrIDe    public IBinder onBind(Intent intent) {        // Todo auto-generated method stub        return null;    }    @OverrIDe    public voID onCreate() {        super.onCreate();        mediaPlayer = new MediaPlayer();        pauseplay = 1;        MainMenu.serviceRunning = 1;        telephonyManager = (TelephonyManager) getSystemService(                Context.TELEPHONY_SERVICE);        // Create a new PhonestateListener        Listener = new PhonestateListener() {            @OverrIDe            public voID onCallStateChanged(int state,String incomingNumber) {                switch (state) {                case TelephonyManager.CALL_STATE_IDLE:                    break;                case TelephonyManager.CALL_STATE_OFFHOOK:                    break;                case TelephonyManager.CALL_STATE_RINGING:                    if (mediaPlayer.isPlaying() == true && mediaPlayer != null){                        pauseSong();                    }                    break;                }            }        };        // Register the Listener wit the telephony manager        telephonyManager.Listen(Listener,PhonestateListener.ListEN_CALL_STATE);    }    public int onStartCommand(Intent intent,int flags,int startID) {        super.onStartCommand(intent,flags,startID);        if (intent != null) {            Bundle bundle = intent.getExtras();            //RetrIEve your data using the name            songurl = bundle.getString("songURL");            Bundle bundle2 = intent.getExtras();            //RetrIEve your data using the name            songname = bundle2.getString("songname");        }        Toast toast = Toast.makeText(getApplicationContext(),"Now Playing: "                + songname,Toast.LENGTH_LONG);        toast.show();        // configure the intent        Intent playIntent = new Intent(MyService.this,SongList.class);        final PendingIntent pendingIntent = PendingIntent.getActivity(                MyService.this,playIntent,0);        notification = new Notification(R.drawable.playicon,"Buffering...",System.currentTimeMillis());        notification.contentVIEw = new RemoteVIEws(getPackagename(),R.layout.custom_notification2);        notification.contentIntent = pendingIntent;        if (SongList.bitmap != null) {            notification.contentVIEw.setimageVIEwBitmap(R.ID.notifimage,SongList.bitmap);        } else {            notification.contentVIEw.setimageVIEwResource(R.ID.notifimage,R.drawable.icon);        }        notification.contentVIEw                .setTextVIEwText(R.ID.notifTitle,"Now Playing");        notification.contentVIEw.setTextVIEwText(R.ID.notiftext,songname);        notification.flags = notification.flags                | Notification.FLAG_ONGOING_EVENT;        mnotificationmanager = (notificationmanager) getApplicationContext()                .getSystemService(Context.NOTIFICATION_SERVICE);        mnotificationmanager.notify(4,notification);        mediaPlayer.reset();        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);        try {            mediaPlayer.setDataSource(songurl);        } catch (IllegalArgumentException e) {            e.printstacktrace();        } catch (IllegalStateException e) {            e.printstacktrace();        } catch (IOException e) {            e.printstacktrace();        }        // register an error Listener via MediaPlayer's setonErrorListener        mediaPlayer.setonErrorListener(new OnErrorListener() {            @OverrIDe            public boolean onError(MediaPlayer mp,int what,int extra) {                Log.e("MEDIAPLAYER ERRORS","what: " + what + "  extra: "                        + extra);                mediaPlayer.reset();                mnotificationmanager.cancel(4);                return false;            }        });        mediaPlayer.prepareAsync();        mediaPlayer.setonPreparedListener(new MediaPlayer.OnPreparedListener() {            @OverrIDe            public voID onPrepared(MediaPlayer mp) {                mediaPlayer.start();            }        });        mediaPlayer                .setonCompletionListener(new MediaPlayer.OnCompletionListener(){                    public voID onCompletion(MediaPlayer mp) {                        stopSelf();                    }                });        return START_STICKY;    }    @OverrIDe    public voID onDestroy() {        MainMenu.serviceRunning = 0;        mnotificationmanager.cancel(4);    }    public static voID pauseSong() {        if (mediaPlayer.isPlaying() == true) {            mediaPlayer.pause();            mnotificationmanager.cancel(4);            pauseplay = 0;        }    }    public static voID playSong() {        if (pauseplay == 0) {            mnotificationmanager.notify(4,notification);            mediaPlayer.start();            pauseplay = 1;        }    }}

解决方法

Why does the onStartCommand get called when my activity ends?

要么在“活动结束”时调用startService()(无论这意味着什么),要么AndroID因为您使用START_STICKY而因某种原因重新启动服务.

就个人而言,对于音乐播放器,我认为START_NOT_STICKY是正确的答案.如果您的服务因任何原因而停止,用户应该负责再次启动它.

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