android - 奥利奥 - 小部件服务和广播接收器 : Not allowed to start service Intent

Question

我有一个监视 wifi 连接的小部件，因此我启动了一个服务来启动广播接收器来检测网络变化。一切正常，除非我退出主应用程序:服务停止。

因此，我在小部件中启动了一个警报管理器，该管理器大约每分钟唤醒一次，并检查主应用程序是否已退出。如果是这种情况，我会尝试重新启动我的 wifi 监控服务，但这次它崩溃并显示以下消息:

Not allowed to start service Intent { cmp=package.CallbackNetworkWidgetService (has extras) }: app is in background uid UidRecord{f6e65b9 u0a154 RCVR idle change:idle|uncached procs:1 seq(0,0,0)}

问题出在 oreo 新的 Intent/服务模型上。它一直有效到牛轧糖。

问题:

1. 我的做法正确吗？

2. 我对前台/后台服务的概念有点迷茫。小部件是后台服务吗？ wifi监控服务/BR也是后台服务？

3. 这里有什么问题？

list :

<receiver android:name=".Widget.TestWidget">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
            </intent-filter>
            <intent-filter>
                <action android:name="AUTO_UPDATE" />
            </intent-filter>
            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/test_widget_info" />
        </receiver>

        <service android:name=".Widget.CallbackNetworkWidgetService"></service>

CallbackWidgetNetworkService

@Override
public int onStartCommand(Intent i, int flags, int startId) {
    context = this.getApplicationContext();
    Log.i("WIDNET", "onStart network");

    isWifiConnected();

    return Service.START_NOT_STICKY;
}

public void isWifiConnected(){

    BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            getNetworkInfo();
          //  Log.i("WIDNET", "broadcastReceiver ipwan: "+ipwan+" type: "+type);
        }
    };

    IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);

    context.registerReceiver(broadcastReceiver, intentFilter);
}

Appwidget - startNetworkService

 public static void startNetworkService(Context context){
        int[] allWidgetIds = new int[0];

        Log.i("WIDNET", "start network service");
        ComponentName thisWidget = new ComponentName(context,
                TestWidget.class);
        if(widgetManager != null)
            allWidgetIds = widgetManager.getAppWidgetIds(thisWidget);

        if(intentNetwork != null) {
            CallbackNetworkWidgetService cnws = new CallbackNetworkWidgetService();
            cnws.stopSelf();
            Log.i("WIDNET", "stop network service");
        }

        intentNetwork = new Intent(context.getApplicationContext(),
                CallbackNetworkWidgetService.class);
        intentNetwork.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, allWidgetIds);

        context.startService(intentNetwork);
    }

Answer 1

为此您需要使用前台服务。

ContextCompat.startForegroundService(context, intentNetwork);

不要忘记 api 26+ 的通知:

@Override
public int onStartCommand(Intent i, int flags, int startId) {
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
      Notification.Builder builder = new Notification.Builder(this, ANDROID_CHANNEL_ID)
            .setContentTitle("wifi listener bla bla bla")
            .setContentText(text)
            .setAutoCancel(true);

      Notification notification = builder.build();
      startForeground(1, notification);
   }
   //...
}