Faça 2 telas, a principal e a de cadastro
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Cadastro" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Consulta" />
</LinearLayout>
Cadastro.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Tela de cadastro" />
<EditText
android:id="@+id/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<requestFocus />
</EditText>
<Button
android:id="@+id/BtRetornar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Retornar" />
</LinearLayout>
Para ir de uma para a outra é só implementar corretamente os cliques dos botões
package com.junior;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class DuasActivity extends Activity {
private Button button1, button2, BtRetornar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
chamarMenuPrincipal();
}
public void chamarCadastro() {
setContentView(R.layout.cadastro);
BtRetornar = (Button) findViewById(R.id.BtRetornar);
BtRetornar.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
chamarMenuPrincipal();
}
});
}
public void chamarMenuPrincipal() {
setContentView(R.layout.main);
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
chamarCadastro();
}
});
}
}