如何防止接收广播消息

时间:2017-08-11 10:18:25

标签: android broadcastreceiver android-service

我有一个有倒数计时器的服务。在倒数计时器结束后,该服务发送广播消息。我使用以下代码发送消息:

Intent intent = new Intent("CancelEvents");
intent.putExtra("message", "cancelled");
LocalBroadcastManager.getInstance(TimerClass.this).sendBroadcast(intent);

我有另一个有广播接收器的活动。这是我用来接收广播消息的代码:

@Override
protected void onCreate(Bundle savedInstanceState)
{
     LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(cancelReceiver,
            new IntentFilter("CancelEvents"));
}

private BroadcastReceiver cancelReceiver = new BroadcastReceiver()
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        String message = intent.getStringExtra("message");

        if (message.equals("cancelled"))
        {
            Toast.makeText(this,
                    "Your Ride Got Cancelled", Toast.LENGTH_LONG).show();
        }
    }
};

接收工作正常,但问题是所有其他活动收到的信息也没有接收者。如何阻止这个?

1 个答案:

答案 0 :(得分:1)

将广播订阅代码移至生命周期的不同部分。

@Override
protected void onStart()
{
    super.onStart();
LocalBroadcastManager.getInstance(getApplicationContext()).registerReceiver(cancelReceiver,
                    new IntentFilter("CancelEvents"));
        }

@Override
    public void onStop() {
        super.onStop();
        LocalBroadcastManager.getInstance(getApplicationContext()).unregisterReceiver(cancelReceiver);
    }

说明:您的活动在后台,但仍在订阅,并且正在显示Toast消息,而不是其他活动。