无法启动接收器：不允许启动服务 Intent；应用程序在后台

Question

所以我制作了一个应用程序，单击按钮即可使用警报管理器设置重复任务。

在创建中：

Intent alarmIntent = new Intent(this, AlarmReceiver.class);
servicePendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);

点击按钮：

alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

    firingCal= Calendar.getInstance();
    firingCal.setTimeInMillis(System.currentTimeMillis());
    firingCal.set(Calendar.HOUR_OF_DAY, 1); // At the hour you want to fire the alarm
    firingCal.set(Calendar.MINUTE, 47); // alarm minute
    firingCal.set(Calendar.SECOND, 0); // and alarm second
    long intendedTime = firingCal.getTimeInMillis();

    long interval = 1000 * 60 * 1;


    alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, intendedTime, interval, servicePendingIntent);

在AlarmReceiver中class:

public void onReceive(Context context, Intent intent) {

    Intent myIntent = new Intent(context, WallpaperService.class);

    context.startService(myIntent);
    Log.d(TAG,"Am apelat serviciul");

    context.stopService(myIntent);

}

在 WallpaperService class 中，我只是发出获取请求并设置壁纸。

public class WallpaperService extends Service {

String requestLink="";
boolean requestFinished = false;
public final String TAG = "Service";
public  static int SERVICE_ID = 1;

@Override
public void onCreate() {
    super.onCreate();
    Log.d(TAG,"Wallpaper Service started");
    Toast.makeText(WallpaperService.this,"Service started",Toast.LENGTH_LONG);
}

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

    Log.d(TAG,"In onStartCommand");
    taskToBeRepeated();
    stopSelf();

    return START_STICKY;
}
.....
}

行为是，当我启动应用程序并单击按钮时，警报管理器第一次触发时一切正常（应用程序在后台）。第二次触发接收器时，我在磁贴中收到错误。更具体地说：

java.lang.RuntimeException: Unable to start receiver com.example.dailywallpaper.AlarmReceiver: java.lang.IllegalStateException: Not allowed to start service Intent { cmp=com.example.dailywallpaper/.WallpaperService }: app is in background uid UidRecord{3e313bf u0a357 RCVR bg:+1m21s273ms idle change:uncached procs:1 seq(0,0,0)}

好像是什么问题？为什么第一次工作然后它给出错误？我该如何解决？

Answer 1

您需要阅读 android 关于在 android 8 及更高版本中使用后台服务或警报的政策的官方文档，并根据此限制调整您的应用程序。

我建议你仔细阅读这两篇文章:

https://developer.android.com/guide/components/services

https://developer.android.com/about/versions/oreo/background

无法启动接收器：不允许启动服务 Intent；应用程序在后台

Unable to start receiver : Not allowed to start service Intent ; App is in background

android

android-studio

service

broadcastreceiver

alarmmanager