MainActivity

package com.flazhost.application1.message;

import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import org.w3c.dom.Text;


public class MainActivity extends AppCompatActivity {

    Button btnSend;
    EditText tvMessage;
    EditText tvNumber;
    IntentFilter intentFilter;

    private BroadcastReceiver intentReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            TextView inTxt = (TextView) findViewById(R.id.textMsg);
            inTxt.setText(intent.getExtras().getString("message"));
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //intent to filter for SMS message receiver
        intentFilter = new IntentFilter();
        intentFilter.addAction("SMS_RECEIVED_ACTION");

        btnSend = (Button) findViewById(R.id.btnSend);
        tvMessage = (EditText) findViewById(R.id.tvMessage);
        tvNumber = (EditText) findViewById(R.id.tvNumber);


        btnSend.setOnClickListener(new onClickListener(){
            String myMsg = tvMessage.getText().toString();
            String theNumber = tvNumber.getText().toString();
            sendMsg(theNumber,myMsg);
        });
    }

    protected void sendMsg(String theNumber, String myMsg){

        String SENT = "Pesan Terkirim";
        String DELIVERED = "Pesan Terdeliver";

        PendingIntent sentPI = PendingIntent.getBroadcast(this, 0, new Intent(SENT),0);
        PendingIntent deliverdPI = PendingIntent.getBroadcast(this, 0, new Intent(DELIVERED),0);

        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(theNumber, null, myMsg, sentPI, deliverdPI);
    }

    @Override
    protected void onResume(){
        //register the receiver
        registerReceiver(intentReceiver, intenFilter);
        super.onResume();
    }

    @Override
    protected void onPause(){
        //unregister the receiver
        unregisterReceiver(intentReceiver);
        super.onPause();
    }
}