如何从 BroadcastReceiver 将 LocalBroadcast 发送到正在运行的服务

Question

我有一个由外部应用程序触发的 BroadcastReceiver，并且其 OnReceive 方法已成功触发。 但我想从该 OnReceive 向我的应用程序中正在运行的服务发送另一个 LocalBroadcast，问题是 LocalBroadcastManager 的 SendBroadcast 方法返回 false，并且服务中的接收器未被触发。安卓网站上没有关于该布尔值的文档。我用谷歌搜索了一下，发现这意味着没有注册的接收器。但我确定我已经在正在运行的服务中成功注册了意图，并且我已将其设置为前台服务以确保它正在运行。

另一个问题，这是从 BroadcastReceiver 与正在运行的服务进行通信的最佳方式吗？

这是代码：

我的服务.java

public class MyService extends Service {
private final IBinder mBinder = new OneSheeldBinder();
public static final String PLUGIN_MESSAGE = "PLUGIN_MESSAGE";
@Override
public void onCreate() {
    LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
              new IntentFilter(MyService.PLUGIN_MESSAGE));
            showNotification();
    super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return START_REDELIVER_INTENT;
}
@Override
public IBinder onBind(Intent intent) {
    return mBinder;
}
@Override
public void onDestroy() {
    hideNotifcation();
    LocalBroadcastManager.getInstance(this).unregisterReceiver(mMessageReceiver);
    super.onDestroy();
}
private void showNotification(){
    Notification.Builder build=new Notification.Builder(this);
    build.setSmallIcon(R.drawable.ic_launcher);
    build.setContentText("The service is running!");
    build.setContentTitle("The service is running!");
    build.setTicker("The service is running!");
    build.setWhen(System.currentTimeMillis());
    Notification notification=build.build();
    startForeground(1, notification);
}
private void hideNotifcation(){
    stopForeground(true);
}
 public class OneSheeldBinder extends Binder {
     public MyService getService() {
            return MyService.this;
        }
    }
 private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
     @Override
     public void onReceive(Context context, Intent intent) {
          Log.d("LocalBroadcast","Received!");
       }
     };
}

火接收器.java

public final class FireReceiver extends BroadcastReceiver
{
@Override
public void onReceive(final Context context, final Intent intent)
{
        Intent intent = new Intent();
        boolean test=LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
        Log.d("LocalBroadcast","Intent Fired!:"+test);//test is always false!
}

}

清单文件中的接收方和服务块

<receiver
        android:name=".FireReceiver"
        android:exported="true"
        android:process=":background"
        tools:ignore="ExportedReceiver" >
        <intent-filter>
            <action android:name="com.twofortyfouram.locale.intent.action.FIRE_SETTING" />
        </intent-filter>
</receiver>
    <service
        android:name=.MyService"
        android:exported="false" />

Answer 1

LocalBroadcastManager是进程的本地。无论出于何种原因，您选择使用两个不同的过程，因此LocalBroadcastManager不起作用。

简单的解决方案是从<receiver>元素中删除android:process=":background"，因为它是浪费的，不必要的，并且会干扰您对LocalBroadcastManager的使用。