2019-12-23 creating toast in android.

package com.mukeshdak.a20191208;

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 {

    Button mdButton;

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

        mdButton = findViewById ( R.id.mdButton );

        mdButton.setOnClickListener ( new View.OnClickListener () {
            @Override
            public void onClick ( View v ) {
                Toast.makeText ( getApplicationContext (), "Button is clicked", Toast.LENGTH_LONG ).show();
            }
        } );
    }
}