奥利奥

本文介绍了奥利奥-窗口小部件服务和广播接收器:不允许启动服务意图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个监视wifi连接的小部件，所以我启动了一项服务来启动广播接收器以检测网络变化.一切正常，除了我退出主应用程序时:服务停止.

I have a widget that monitors wifi connectivity so I start a service to initiate a broadcast receiver to detect network changes. All works well except when I exit the main app: the service stops.

因此，我在窗口小部件中启动了一个警报管理器，该警报管理器大约每分钟醒来一次，并检查主应用程序是否已退出.如果是这种情况，我尝试重新启动wifi监控服务，这次它崩溃并显示以下消息:

So I initiate in the widget an Alarm Manager that awakes roughly every minute and checks if the main app has exited. If that is the case I attempt to restart my wifi monitoring service and this time it crashes with the message:

不允许启动服务意图{ cmp = package .CallbackNetworkWidgetService(有其他功能)}:应用程序已在 后台uid UidRecord {f6e65b9 u0a154 RCVR空闲更改:空闲|未缓存 procs:1 seq(0,0,0)}

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新的意图/服务模型上.直到牛轧糖都可以使用.

The issue is with the oreo new intent/service model. It works until nougat.

问题:

我的方法正确吗?

is my approach correct?

我对前台/后台服务的概念有些迷惑.小部件是背景svce? wifi监控服务/BR还是后台服务吗?

I'm a little bit lost with the notion of foreground/background service. The widget is a background svce? The wifi monitoring service/BR is also a background svce?

这是什么问题?

清单:

<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

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

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); }

推荐答案

您需要为此使用前台服务.

You need to use foreground service for this purpose.

ContextCompat.startForegroundService(context, intentNetwork);

不要忘记api 26+的通知:

Don't forget for notification for api 26+ :

@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); } //... }