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广播接收器仅在应用程序打开时有效

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您好我创建了一个自动短信应用程序,它会在收到 firebase 通知时自动发送短信。我能够发送短信扩展FirebaseMessagingService。现在,为了获得发送状态,我在主要活动中创建了一个广播接收器。在这里,我只能在 App 打开时才能获得短信发送状态。即使应用程序是后台,我也需要这样做。

我的收件人是:

private BroadcastReceiver receiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            String message = null;
            switch (getResultCode()) {
                case Activity.RESULT_OK:
                    message = "Message sent!";
                    Log.e("DATA", message);
                    unregisterReceiver(receiver);
                    break;
                case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                    message = "Error. Message not sent.";
                    Log.e("DATA", message);
                    unregisterReceiver(receiver);
                    break;
                case SmsManager.RESULT_ERROR_NO_SERVICE:
                    message = "Error: No service.";
                    Log.e("DATA", message);
                    unregisterReceiver(receiver);
                    break;
                case SmsManager.RESULT_ERROR_NULL_PDU:
                    message = "Error: Null PDU.";
                    Log.e("DATA", message);
                    unregisterReceiver(receiver);
                    break;
                case SmsManager.RESULT_ERROR_RADIO_OFF:
                    message = "Error: Radio off.";
                    Log.e("DATA", message);
                    unregisterReceiver(receiver);
                    break;
            }
        }
    };

在 onCreate 中注册接收者:

registerReceiver(receiver, new IntentFilter(Constants.SMS_SENT));

我的 firebase 服务使用以下命令发送短信:

private void sendSms(String phonenumber[],String message)
    {
        SmsManager manager = SmsManager.getDefault();
        PendingIntent piSend = PendingIntent.getBroadcast(this, 0, new Intent(Constants.SMS_SENT), 0);
        PendingIntent piDelivered = PendingIntent.getBroadcast(this, 0, new Intent(Constants.SMS_DELIVERED), 0);
            int length = message.length();
            if(length > MAX_SMS_MESSAGE_LENGTH)
            {
                ArrayList<String> messagelist = manager.divideMessage(message);
                for(String number : phonenumber) {
                    manager.sendMultipartTextMessage(number, null, messagelist, null, null);
                }
            }
            else
            {
                for(String number : phonenumber) {
                    manager.sendTextMessage(number, null, message, piSend, piDelivered);
                }
            }
    }

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