Question

我正在使用this code作为我的项目的示例，以便在锁定屏幕上显示一个片段，但是它只能在主要活动没有被破坏（没有从最近的活动中删除）之前起作用，并且有时只起作用一段时间，然后停止在屏幕上显示片段。

我如何一直运行服务？也有新的API支持它..

Answer 1

在清单中初始化服务，您必须在开始按钮中按如下所示调用服务

Intent i = new Intent(this, AnotherService.class);
        i.setAction("C.ACTION_START_SERVICE");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            startForegroundService(i);
        }
        else
        {
            startService(i);
        }

然后您必须像下面一样启动服务

public class AnotherService extends Service {
static final int NOTIFICATION_ID = 543;
public AnotherService() {
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}

@Override
public void onCreate() {
    super.onCreate();
   if (Build.VERSION.SDK_INT > Build.VERSION_CODES.O)
        startMyOwnForeground();
    else
        startForeground(1, new Notification());
        
   //your code here
    

   
}

@RequiresApi(Build.VERSION_CODES.O)
private void startMyOwnForeground() {

    String NOTIFICATION_CHANNEL_ID = "example.permanence";
    String channelName = "Background Service";
    NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_NONE);
    chan.setLightColor(Color.BLUE);
    chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);


    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    assert manager != null;
    manager.createNotificationChannel(chan);

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
    Notification notification = notificationBuilder.setOngoing(true)
            .setContentTitle("App is running in background")
            .setPriority(NotificationManager.IMPORTANCE_MIN)
            .setCategory(Notification.CATEGORY_SERVICE)

            .build();
    startForeground(2, notification);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    return START_STICKY;
    //return super.onStartCommand(intent, flags, startId);
}


@Override
public void onDestroy() {
    super.onDestroy();
}

如果您已完成服务，则必须在要停止的活动中使用此按钮更改停止按钮代码

stopService(new Intent(YourActivity.this, AnotherService.class));

Android服务会在一段时间后停止

1 个答案: