/*
 MainActivity.java
*/



package com.example.p;


import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {




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



        Button sobre = (Button) findViewById(R.id.button1);
          sobre.setOnClickListener(new OnClickListener() {
           public void onClick(View v) {
               setContentView(R.layout.janela2);
           }
           });


    }
}



/*
t.java
*/


package com.example.p;

import android.app.Activity;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class t extends Activity{

    Button volta;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.janela2);

    volta =(Button) findViewById(R.id.button2);
     volta.setOnClickListener(new OnClickListener() {
           public void onClick(View v) {
               setContentView(R.layout.activity_main);
           }
           });
    }

}