Android สอบถามเรื่อง google map api ไม่ขึ้นเป็นรูปแผนที่ค่ะ

package com.app.project;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;


import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends MapActivity {
	
	private LocationManager lm;
	private LocationListener locationListener;
	
	private MapView mapView;
	private MapController mc;
	
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		mapView = (MapView) findViewById(R.id.mapview1);
		mapView.setBuiltInZoomControls(true);
		
		mc = mapView.getController();
		mc.setZoom(14);
		
		lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
		locationListener = new MyLocationListener();
		lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, locationListener);
		
	}
	
	private class MyLocationListener implements LocationListener {
		public void onLocationChanged(Location loc){
			if (loc != null){
				Toast.makeText(
						getBaseContext(),"Location changed \nLat:"
						+ loc.getLatitude()
						+ "\nLng: " + loc.getLongitude(),
						Toast.LENGTH_SHORT).show();
				
				int lat = (int) (loc.getLatitude() * 1E6);
				int lng = (int) (loc.getLongitude() * 1E6);
				GeoPoint point = new GeoPoint(lat, lng);
				mc.animateTo(point);
			}
		}

		public void onProviderDisabled(String provider) {
	
		}

		public void onProviderEnabled(String provider) {
	
		}
	
		public void onStatusChanged(String provider, int status, Bundle extras) {
		
		}
	}
	
	@Override
	protected boolean isRouteDisplayed(){
		return false;
	}
	
}

<?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" >
<com.google.android.maps.MapView
    android:id="@+id/mapview1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:enabled="true"
    android:clickable="true"
    android:apiKey="AIzaSyA8EWggEChPYUHLNwXPBQE9DHFeJ-UiAvw">
    
</com.google.android.maps.MapView>
</LinearLayout>