Question

在后台运行应用程序时，如何从BroadcastReceiver启动Android服务？

使用案例如下：其他应用可以通过向我的应用发送轮询广播（作为定向广播，由清单声明的接收者接收）来向我的应用请求数据。然后，广播接收器将启动提供数据的服务（如果尚未运行）。然后该服务将检索数据（除非它已经在运行并且已经缓存了数据）并回答请求（通过发送另一个广播）。

这是我尝试过的代码：

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        /* Start the service with the internal poll intent */
        Intent outIntent = new Intent(Const.ACTION_INTERNAL_POLL, null, context, MyService.class);
        context.startService(outIntent);
    }
}

这在较旧的Android版本上有效，但在Android 8上却失败，因为后台的应用无法启动服务。 Logcat在这里：

07-19 21:44:56.334 11096 11096 E AndroidRuntime: java.lang.RuntimeException: Unable to start receiver org.traffxml.roadeagle.android.core.MyReceiver: java.lang.IllegalStateException: Not allowed to start service Intent { act=my.app.POLL cmp=my.app/.android.core.MyReceiver (has extras) }: app is in background uid UidRecord{dfb1a59 u0a169 RCVR idle change:idle|uncached procs:1 seq(0,0,0)}
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.app.ActivityThread.handleReceiver(ActivityThread.java:3194)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.app.ActivityThread.-wrap17(Unknown Source:0)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1672)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.os.Handler.dispatchMessage(Handler.java:106)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.os.Looper.loop(Looper.java:164)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.app.ActivityThread.main(ActivityThread.java:6494)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at java.lang.reflect.Method.invoke(Native Method)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
07-19 21:44:56.334 11096 11096 E AndroidRuntime: Caused by: java.lang.IllegalStateException: Not allowed to start service Intent { act=my.app.POLL cmp=my.app/.android.core.TraffReceiver (has extras) }: app is in background uid UidRecord{dfb1a59 u0a169 RCVR idle change:idle|uncached procs:1 seq(0,0,0)}
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.app.ContextImpl.startServiceCommon(ContextImpl.java:1521)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.app.ContextImpl.startService(ContextImpl.java:1477)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.content.ContextWrapper.startService(ContextWrapper.java:650)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.content.ContextWrapper.startService(ContextWrapper.java:650)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at my.app.android.core.MyReceiver.onReceive(MyReceiver.java:40)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    at android.app.ActivityThread.handleReceiver(ActivityThread.java:3187)
07-19 21:44:56.334 11096 11096 E AndroidRuntime:    ... 8 more

有什么办法解决吗？

在后台时从BroadcastReceiver启动Android服务

0 个答案: