Register BroadcastReceiver For Incoming SMS

Question

How to Register BroadcastReceiver For blocking Incoming SMSs

    IntentFilter intentFilter = new IntentFilter(Intent."what should be here");
     ctx.registerReceiver(outgoingReceiver, intentFilter);

Answer 1

You should check for the permission

if (ContextCompat.checkSelfPermission(mActivity, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.RECEIVE_SMS}, 0);
} else {
        // register sms receiver
        IntentFilter filter = new IntentFilter(Telephony.Sms.Intents.SMS_RECEIVED_ACTION);
        registerReceiver(smsReceiver, filter);
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (ContextCompat.checkSelfPermission(mActivity, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED) {

    } else {
        // register sms receiver
        IntentFilter filter = new IntentFilter(Telephony.Sms.Intents.SMS_RECEIVED_ACTION);
        registerReceiver(smsReceiver, filter);
}
    }

Answer 2

Try the following :

intentFilter.addAction("android.provider.Telephony.SMS_RECEIVED");

Hope this helps.