Android服务在一段时间后停止

Question

我将此代码作为项目的示例，在锁屏上显示片段，但它只能在主活动未被销毁(未从最近的活动中删除(之前工作，有时只能工作一段时间，然后停止在屏幕上显示片段。。

如何始终运行服务？新的API也支持它。。

Answer 1

初始化清单中的服务，您必须在启动按钮中调用如下服务

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);
}

然后你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();
}

如果你完成了服务，那么你必须在你想要停止的活动中更改停止按钮代码

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