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android – Can i automatically send SMS (Without the user need to approve)

Posted by: admin April 23, 2020 Leave a comment

Questions:

I’m rather new to Android.
Im trying to send SMS from Android application.
When using the SMS Intent the SMS window opens and the user needs to approve the SMS and send it.

Is there a way to automatically send the SMS without the user confirming it?

Thanks,
Lior

How to&Answers:

You can use this method to send an sms. If the sms is greater than 160 character then sendMultipartTextMessage is used.

private void sendSms(String phonenumber,String message, boolean isBinary)
{
    SmsManager manager = SmsManager.getDefault();

    PendingIntent piSend = PendingIntent.getBroadcast(this, 0, new Intent(SMS_SENT), 0);
    PendingIntent piDelivered = PendingIntent.getBroadcast(this, 0, new Intent(SMS_DELIVERED), 0);

    if(isBinary)
    {
            byte[] data = new byte[message.length()];

            for(int index=0; index<message.length() && index < MAX_SMS_MESSAGE_LENGTH; ++index)
            {
                    data[index] = (byte)message.charAt(index);
            }

            manager.sendDataMessage(phonenumber, null, (short) SMS_PORT, data,piSend, piDelivered);
    }
    else
    {
            int length = message.length();

            if(length > MAX_SMS_MESSAGE_LENGTH)
            {
                    ArrayList<String> messagelist = manager.divideMessage(message);

                    manager.sendMultipartTextMessage(phonenumber, null, messagelist, null, null);
            }
            else
            {
                    manager.sendTextMessage(phonenumber, null, message, piSend, piDelivered);
            }
    }
}

Update

piSend and piDelivered are Pending Intent They can trigger a broadcast when the method finish sending an SMS

Here is sample code for broadcast receiver

    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!";
                break;
            case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                message = "Error. Message not sent.";
                break;
            case SmsManager.RESULT_ERROR_NO_SERVICE:
                message = "Error: No service.";
                break;
            case SmsManager.RESULT_ERROR_NULL_PDU:
                message = "Error: Null PDU.";
                break;
            case SmsManager.RESULT_ERROR_RADIO_OFF:
                message = "Error: Radio off.";
                break;
            }

            AppMsg.makeText(SendMessagesWindow.this, message,
                    AppMsg.STYLE_CONFIRM).setLayoutGravity(Gravity.BOTTOM)
                    .show();
      }
  };

and you can register it using below line in your Activity

registerReceiver(receiver, new IntentFilter(SMS_SENT));  // SMS_SENT is a constant

Also don’t forget to unregister broadcast in onDestroy

@Override
protected void onDestroy() {
    unregisterReceiver(receiver);
    super.onDestroy();
}

Answer:

If your application has in the AndroidManifest.xml the following permission

<uses-permission android:name="android.permission.SEND_SMS"/>

you can send as many SMS as you want with

SmsManager manager = SmsManager.getDefault();
manager.sendTextMessage(...);

and that is all.

Answer:

Yes, you can send SMS using the SmsManager. Please keep in mind that your application will need the SEND_SMS permission for this to work.

Answer:

Yes, you can send sms without making user interaction…But it works, when user wants to send sms only to a single number.

try {    
    SmsManager.getDefault().sendTextMessage(RecipientNumber, null,    
    "Hello SMS!", null, null);    
} catch (Exception e) {    
    AlertDialog.Builder alertDialogBuilder = new    
    AlertDialog.Builder(this);    
    AlertDialog dialog = alertDialogBuilder.create();    
    dialog.setMessage(e.getMessage());    
    dialog.show();    
}    

Also, add manifest permission….

<uses-permission android:name="android.permission.SEND_SMS"/>