Delay several SMS Android Studio [duplicated]

Dear community. how could I do so that when sending several SMS there is a difference of X seconds in the shipment. Where X is a different wait time for each message.
For example:

• Message 1: Immediately when pressing the button
• Message 2: 20 seconds after message 1
• Message 3: 10 seconds after message 2
• Message 4: 5 seconds after message 3

• Message> = 5: 3 seconds after the previous message.

  Thank you very much for your help.

Here the code.

import android.app.Activity;
import android.app.PendingIntent;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.telephony.SmsManager;
import android.view.Menu;
import android.view.View.OnClickListener;
import android.widget.EditText;
import android.widget.Toast;
import android.Manifest;
import android.os.Handler;

import java.util.Timer;
import java.util.TimerTask;



public class otrosSMS extends Activity {



    EditText txtPhoneNo;
    EditText txtMessage;
    EditText txttime;
    Button btnSend;
    String p = Manifest.permission.SEND_SMS;

    @Override


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mensajes);






        txtPhoneNo = (EditText) this.findViewById(R.id.nrotelf);
        txtMessage = (EditText) this.findViewById(R.id.editText2);
        txttime = (EditText) this.findViewById(R.id.editText);

        btnSend = (Button) this.findViewById(R.id.btnsms);



        btnSend.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View view) {


                // Obtener numero de telefono y mensaje

                checkSMSStatePermission();
                String phoneNo = txtPhoneNo.getText().toString();
                String message = "Mensaje de prueba";
                String message1 = "Mensaje de prueba 2";
                String message2= "Mensaje de prueba 3";


                // Si el numero y el sms no esta vacio
                if (phoneNo.length()>0){
                    sendMessage(phoneNo, message);
                    sendMessage(phoneNo, message1);
                    sendMessage(phoneNo, message2);

                    // If phone number or message not empty
                }else{
                    Toast.makeText(getBaseContext(), "Por favor ingrese el numero de telefono del GPS.", Toast.LENGTH_LONG).show();
                }
            }
        });
    }


    // Funcion Enviar mensaje SMS
    private void sendMessage(final String phoneNo, final String message) {
        try {

            final Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    //enviar sms luego de 20s
                    SmsManager smsManager = SmsManager.getDefault();
                    PendingIntent sentPI;
                    String SENT = "SMS_SENT";
                    //el primer parametro recibe el contexto asi que lo
                    // llamas desde un fragment tendras
                    //cambiar el this por getContext()
                    sentPI = PendingIntent.getBroadcast(otrosSMS.this, 0, new Intent(SENT), 0);
                    smsManager.sendTextMessage(phoneNo, null, message, sentPI, null);
                }
            }, 20000);






            Toast.makeText(getApplicationContext(), "SMS enviado.", Toast.LENGTH_LONG).show();
        } catch (Exception e) {
            Toast.makeText(getApplicationContext(), "SMS Fallido. Intente de nuevo!", Toast.LENGTH_LONG).show();
            e.printStackTrace();
        }
    }



    private void checkSMSStatePermission() {
        int permissionCheck = ContextCompat.checkSelfPermission(
                this, Manifest.permission.SEND_SMS);
        if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
            Log.i("Mensaje", "No se tiene permiso para enviar SMS.");
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.SEND_SMS}, 225);
        } else {
            Log.i("Mensaje", "Se tiene permiso para enviar SMS!");
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.

        return true;
    }

}