MainActivity.java package com.blogspot.csdevbin.mynewpractice; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super .onCreate(savedInstanceState); setContentView(R.layout. activity_main ); B1(); } private void B1() { Button b1 = (Button) findViewById(R.id. button1 ); b1.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Toast. makeText (getApplication(), "Button 1 clicked" ,Toast. LENGTH_LONG ).show(); } }); } } activity_main.xml <? xml version= "1.0" enc