<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/idvonhallotext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/idvonhallotext"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="155dp"
        android:layout_marginLeft="60dp"
        android:ems="10"
        android:inputType="text" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/idvonhallotext"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="74dp"
        android:text="Button" />

</RelativeLayout>

Code 0-1: Datei activity_main.xml (Nicht ganz das gleiche Projekt wie oben besprochen!)

package com.example.hallo;

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

public class MainActivity extends Activity implements OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //Listener beim Knopf registrieren:
	    Button knopf = (Button) findViewById(R.id.button1);
	    knopf.setOnClickListener(this);        
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    public void onClick(View v)
    {
    	    EditText text1 = (EditText) findViewById(R.id.editText1);
    	    text1.setText("Hallo");
    }    
}

Code 0-2: Datei MainActivity.java (Nicht ganz das gleiche Projekt wie oben besprochen!)