Eu escrevi esses códigos
package com.example.myapplication;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.example.myapplication.R;
import android.widget.ImageView;
import android.widget.EditText;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button)findViewById(R.id.button_outratela);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{ setContentView(R.layout.segundatela);}
});
Button sair=(Button)findViewById(R.id.button_id);
sair.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{ finish( );}
});
}
}
<TextView
android:id="@+id/txt_hello1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="aperte aqui para
O que eu preciso acrescentar ou tirar