MainActivity.java

package com.example.dummy1;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.content.Intent;


public class MainActivity extends AppCompatActivity {

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

        Button btn = (Button) findViewById(R.id.button1);
        btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick (View v) {

                // Start NewActivity.class
                Intent myIntent = new Intent(MainActivity.this, Main2Activity.class);
                startActivity(myIntent);
            }

        });
    }
}