Android Google Map API programming

The layout in XML (substitute Map API key in XXXX... ):

 <?xml version="1.0" encoding="utf-8"?>
<!-- This file is /res/layout/mapview.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:orientation="horizontal" android:layout_width="fill_parent"
       android:layout_height="wrap_content">
       <Button android:id="@+id/zoomin" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="+"
            android:onClick="myClickHandler" android:padding="12px" />
       <Button android:id="@+id/zoomout" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="-"
            android:onClick="myClickHandler" android:padding="12px" />
       <Button android:id="@+id/sat" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Satellite"
            android:onClick="myClickHandler" android:padding="8px" />
       <Button android:id="@+id/street" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Street"
            android:onClick="myClickHandler" android:padding="8px" />
       <Button android:id="@+id/traffic" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Traffic"
            android:onClick="myClickHandler" android:padding="8px" />
       <Button android:id="@+id/normal" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:text="Normal"
            android:onClick="myClickHandler" android:padding="8px" />
  </LinearLayout>
  <com.google.android.maps.MapView
       android:id="@+id/mapview" android:layout_width="fill_parent"
       android:layout_height="wrap_content" android:clickable="true"
       android:apiKey="XXXXXXXXXXXXXXXXXXXXXXXXXX" />
</LinearLayout>

The main activity:

 package com.mvda; 
// This file is MapViewDemoActivity.java 
import android.os.Bundle; 
import android.view.View; 
import com.google.android.maps.MapActivity; 
import com.google.android.maps.MapView; 
public class MapViewDemoActivity extends MapActivity 
{ 
  private MapView mapView; 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mapview); 
    mapView = (MapView)findViewById(R.id.mapview); 
  } 
  public void myClickHandler(View target) { 
    switch(target.getId()) { 
    case R.id.zoomin: 
         mapView.getController().zoomIn(); 
         break; 
    case R.id.zoomout: 
         mapView.getController().zoomOut(); 
         break; 
    case R.id.sat: 
         mapView.setSatellite(true); 
         break; 
    case R.id.street: 
         mapView.setStreetView(true); 
         break; 
    case R.id.traffic: 
         mapView.setTraffic(true); 
         break; 
    case R.id.normal: 
         mapView.setSatellite(false); 
         mapView.setStreetView(false); 
         mapView.setTraffic(false); 
         break; 
    } 
  } 
  @Override 
  protected boolean isLocationDisplayed() { 
    return false; 
  } 
  @Override 
  protected boolean isRouteDisplayed() { 
    return false; 
  } 
}