注册广播接收器后多次调用广播接收器

Question

我正在开发 android 可以发送 SMS 的应用程序。发送第一条 SMS 时，广播接收器的 onReceive 方法根据收到的响应将 SMS 的状态显示为 SMS Sent 和 SMS Delievered 或 Generic Failure。但是当再次发送 SMS 时，onReceiver 首先显示先前发送的消息的状态，然后显示新消息。意味着每次调用 onReceiver 时，它都会显示每条先前发送的消息的状态。下面的class是扩展Worker写的，所以activity像onStop和onResume这样的生命周期方法不能在这里被覆盖。

感谢任何帮助。代码如下。

PendingIntent sentPI = PendingIntent.getBroadcast(getApplicationContext(), 0,
            new Intent(SENT), PendingIntent.FLAG_ONE_SHOT);

PendingIntent deliveredPI = PendingIntent.getBroadcast(getApplicationContext(), 0,
            new Intent(DELIVERED), PendingIntent.FLAG_ONE_SHOT);


 
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            switch (getResultCode()) {
                case Activity.RESULT_OK:
                    status = sms_id + " : SMS Sent";
                    Toast.makeText(context, status, Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                    status = sms_id + " : Generic failure ";
                    Toast.makeText(context, status, Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NO_SERVICE:
                    status = sms_id + " : No service ";
                    Toast.makeText(context, status, Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NULL_PDU:
                    status = sms_id + " : Null PDU  ";
                    Toast.makeText(context, status, Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_RADIO_OFF:
                    status = sms_id + " : Radio off ";
                    Toast.makeText(context, status, Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    };
    IntentFilter filter = new IntentFilter(SENT);
    getApplicationContext().registerReceiver(broadcastReceiver, filter);
    //---when the SMS has been delivered---
    BroadcastReceiver broadcastReceiver1 = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            switch (getResultCode()) {
                case Activity.RESULT_OK:
                    receiverStatus = sms_id + " : SMS delivered ";
                    Toast.makeText(context, receiverStatus, Toast.LENGTH_SHORT).show();
                    addItem(receiverStatus);
                    break;
                case Activity.RESULT_CANCELED:
                    receiverStatus = sms_id + " : SMS not delivered ";
                    Toast.makeText(context, receiverStatus, Toast.LENGTH_SHORT).show();
                    addItem(receiverStatus);
                    break;
            }
        }
    };
    IntentFilter filter1 = new IntentFilter(DELIVERED);
    getApplicationContext().registerReceiver(broadcastReceiver1, filter1);
    try {
        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, sentPI, deliveredPI);
        handler.post(() -> Toast.makeText(getApplicationContext(), " Do Work", Toast.LENGTH_SHORT).show());
        return Result.success();
    } catch (Exception e) {
        handler.post(() -> Toast.makeText(getApplicationContext(), "Error: " + e.getMessage(), Toast.LENGTH_SHORT).show());
        return Result.retry();
    }

Answer 1

你在这里做了很多错误的事情。首先 Broadcast Receiver 不应该在 Worker Thread 中被调用。它始终适用于 UI Thread。因此，每当您创建工作请求时，Broadcast Receiver 都会被注册，因此将在创建工作请求时注册多次。而且您不会在任何地方注销它。所以会被执行多次。您应该在 onCreate 中注册广播接收器并在 onStop/onResume 中注销它。这样他们就不会被重复注册了。

希望对您有所帮助 ;).

注册广播接收器后多次调用广播接收器

Broadcast Receiver is called multiple times after registering broadcast receiver

java

android

broadcastreceiver