本地广播管理器使用主 Activity 未收到的警报

Question

我已经实现了一个警报管理器，它运行良好，每 15 分钟触发一次。现在我想使用闹钟每 15 分钟调用一次 MainActivity 方法。所以我使用本地广播到 MainActivity （知道这是我 [=42] 上的当前 activity 运行 =]) 传送启动方法的命令。但问题是 MainActivity 没有在 onReceive 方法上接收数据。

报警

@Override
public void onReceive(Context context, Intent intent) {
    cont = context;
    PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
    PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
    wl.acquire();


    String url = intent.getExtras().getString("url");
    Log.w(TAG, "Service " + url);

    new GetJSON_val(){
        @Override
        protected String[] doInBackground(String... url) {
            Some Code...

        @Override
        protected void onPostExecute(String[] result) {
            Some Code...

            // I send the broadcast to main Activity
            Log.e("sender", "Broadcasting message");
            Intent intent = new Intent("custom-event-name");

            intent.putExtra("message", "This is my message!");

            LocalBroadcastManager.getInstance(cont).sendBroadcast(intent);

                }
            }
        }
    }.execute(url);


    // End of alarm code

    wl.release();
}

主要Activity

  @Override
  public void onCreate(Bundle savedInstanceState) {
  ...
  LocalBroadcastManager.getInstance(this).registerReceiver(mMessageReceiver,
            new IntentFilter("custom-event-name"));
   ...
}
   private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        // Get extra data included in the Intent
        String message = intent.getStringExtra("message");
        Log.e("receiver", "Got message: " + message);

    }
};

Local Broadcaster 是在 postExecute 方法中的 Alarm class 中创建的。

Answer 1

我认为问题是您在 onReceive() 中执行长运行任务并访问相同的 context

you should never perform long-running operations in it (there is a timeout of 10 seconds that the system allows before considering the receiver to be blocked and a candidate to be killed).

解决方案

要么使用 goAsync() .
或者对后台任务使用IntentService并在任务完成后发送广播。

本地广播管理器使用主 Activity 未收到的警报

Local Broadcast Manager using an alarm not received by main Activity

java

android

android-intent

localbroadcastmanager