Question

我想仅针对特定活动进行广播。如果活动被破坏，那么广播将不会触发。我这样使用

    protected void onStart() {
        super.onStart();
        LocalBroadcastManager.getInstance(this).registerReceiver((receiver),
                new IntentFilter(GCMIntentService.COPA_RESULT)
        );
    }
receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                int count = intent.getIntExtra(GCMIntentService.COPA_MESSAGE, 0);
                int youCount = intent.getIntExtra(GCMIntentService.COUNT_YOU, 0);
                int reqCount = intent.getIntExtra(GCMIntentService.COUNT_REQ, 0);
                if (count != 0) {
                    notificationcount.setVisibility(View.VISIBLE);
                    notificationcount.setText("" + count);
                } else {
                    notificationcount.setVisibility(View.GONE);
                }
                AppCommon.notification_requestcount = reqCount;
                AppCommon.notification_youcount = youCount;
                AppCommon.notification_total_count = count;
            }
        };

我缺少的请提出这个

Answer 1

如果你想这样做，只需做一件事就可以在Activity中注册Broadcast接收器，并在同一个Activity中取消注册。喜欢以下

    @Override
    protected void onStart() {
        super.onStart();
        LocalBroadcastManager.getInstance(this).registerReceiver((receiver),
                new IntentFilter(GCMIntentService.COPA_RESULT)
        );
    }

    @Override
    protected void onStop() {
        LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
        super.onStop();
    }

 receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                int count = intent.getIntExtra(GCMIntentService.COPA_MESSAGE, 0);
                int youCount = intent.getIntExtra(GCMIntentService.COUNT_YOU, 0);
                int reqCount = intent.getIntExtra(GCMIntentService.COUNT_REQ, 0);
                if (count != 0) {
                    notificationcount.setVisibility(View.VISIBLE);
                    notificationcount.setText("" + count);
                } else {
                    notificationcount.setVisibility(View.GONE);
                }
                AppCommon.notification_requestcount = reqCount;
                AppCommon.notification_youcount = youCount;
                AppCommon.notification_total_count = count;
            }
        };

Answer 2

在Activity内创建接收器并添加属性。同一时间，如果您希望在Activity分别在register和unregister上onResume()和onPause()时销毁接收器。

演示：

在您的活动上创建BroadcastReceiver：

 private BroadcastReceiver receiver = new BroadcastReceiver() {
 @Override
 public void onReceive(Context context, Intent intent) {
        // your methods and actions for receiver
    }
 };

在您的活动onCreate()方法中注册广播：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.your_layout);
    your_activity_.this.registerReceiver(receiver, new IntentFilter(your_filter_action));
    ..
    ...
    ....
  }

不要忘记在活动周期取消注册/注册：

@Override
protected void onResume() {
    super.onResume();
    your_activity.this.registerReceiver(receiver, new IntentFilter(your_filter_action));

}

@Override
protected void onPause() {
    super.onPause();
    your_activity.this.unregisterReceiver(receiver);

}

Answer 3

您忘记取消注册广播接收器，请检查。

@Override
    protected void onStop() {
        LocalBroadcastManager.getInstance(this).unregisterReceiver(receiver);
        super.onStop();
    }

如何在android中生成仅用于特定活动的广播

3 个答案: