前臺服務示例

Question

我是android新手。任何人都可以發佈「有通知的android前臺服務示例」的鏈接或代碼。我搜索了一下，但沒有得到任何前臺服務的例子。

Answer 1

創建Notification，可能使用Notification.Builder或NotificationCompat.Builder，並傳遞到startForeground()上的服務：

public class Downloader extends IntentService { 
    private static int FOREGROUND_ID=1338; 

    public Downloader() { 
    super("Downloader"); 
    } 

    @Override 
    public void onHandleIntent(Intent i) { 
    startForeground(FOREGROUND_ID, 
        buildForegroundNotification(filename)); 

    // do useful work here 

    stopForeground(true); 
    } 

    private Notification buildForegroundNotification(String filename) { 
    NotificationCompat.Builder b=new NotificationCompat.Builder(this); 

    b.setOngoing(true); 

    b.setContentTitle(getString(R.string.downloading)) 
    .setContentText(filename) 
    .setSmallIcon(android.R.drawable.stat_sys_download) 
    .setTicker(getString(R.string.downloading)); 

    return(b.build()); 
    } 
} 

（從this sample project修剪牀服務）

Answer 2

一個更好的例子將是：

@Override 
public int onStartCommand(Intent intent, int flags, int startId) { 
if (intent.getAction().equals(Constants.ACTION.STARTFOREGROUND_ACTION)) { 
Log.i(LOG_TAG, "Received Start Foreground Intent "); 
Intent notificationIntent = new Intent(this, MainActivity.class); 
notificationIntent.setAction(Constants.ACTION.MAIN_ACTION); 
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK 
| Intent.FLAG_ACTIVITY_CLEAR_TASK); 
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, 
notificationIntent, 0); 

Intent previousIntent = new Intent(this, ForegroundService.class); 
previousIntent.setAction(Constants.ACTION.PREV_ACTION); 
PendingIntent ppreviousIntent = PendingIntent.getService(this, 0, 
previousIntent, 0); 

Intent playIntent = new Intent(this, ForegroundService.class); 
playIntent.setAction(Constants.ACTION.PLAY_ACTION); 
PendingIntent pplayIntent = PendingIntent.getService(this, 0, 
playIntent, 0); 

Intent nextIntent = new Intent(this, ForegroundService.class); 
nextIntent.setAction(Constants.ACTION.NEXT_ACTION); 
PendingIntent pnextIntent = PendingIntent.getService(this, 0, 
nextIntent, 0); 

Bitmap icon = BitmapFactory.decodeResource(getResources(), 
R.drawable.truiton_short); 

Notification notification = new NotificationCompat.Builder(this) 
.setContentTitle("Truiton Music Player") 
.setTicker("Truiton Music Player") 
.setContentText("My Music") 
.setSmallIcon(R.drawable.ic_launcher) 
.setLargeIcon(
Bitmap.createScaledBitmap(icon, 128, 128, false)) 
.setContentIntent(pendingIntent) 
.setOngoing(true) 
.addAction(android.R.drawable.ic_media_previous, 
"Previous", ppreviousIntent) 
.addAction(android.R.drawable.ic_media_play, "Play", 
pplayIntent) 
.addAction(android.R.drawable.ic_media_next, "Next", 
pnextIntent).build(); 
startForeground(Constants.NOTIFICATION_ID.FOREGROUND_SERVICE, 
notification); 
} else if (intent.getAction().equals(Constants.ACTION.PREV_ACTION)) { 
Log.i(LOG_TAG, "Clicked Previous"); 
} else if (intent.getAction().equals(Constants.ACTION.PLAY_ACTION)) { 
Log.i(LOG_TAG, "Clicked Play"); 
} else if (intent.getAction().equals(Constants.ACTION.NEXT_ACTION)) { 
Log.i(LOG_TAG, "Clicked Next"); 
} else if (intent.getAction().equals(
Constants.ACTION.STOPFOREGROUND_ACTION)) { 
Log.i(LOG_TAG, "Received Stop Foreground Intent"); 
stopForeground(true); 
stopSelf(); 
} 
return START_STICKY; 
} 

參考了tutorial here ..可能對您有幫助