Google Maps V2 - Map is not loading

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Mobile

Android

Personally, I'm a problem, since a while I can not solve, I tried several ways and nothing .... then I'm doing an APP location pretty simple, but does not load, is only in Blank Screen (Cartesian plane). Below is the source code. Who can help me, I'm new to Android application.

AndroidManifest.xml

package nl.codestone.cookbook.maptest;

import android.os.Bundle;

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

public class MapTest extends MapActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        MapView mapview = (MapView) findViewById(R.id.mapview);
        mapview.setBuiltInZoomControls(true); 
    
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>

<com.google.android.maps.MapView  
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mapview"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:apiKey="AIzaSyBLRbJiQXyenW5t5P0U4tjxfWQhpDpfbcA"
    android:clickable="true"
    />

MapTest.java

package nl.codestone.cookbook.maptest;

import android.os.Bundle;

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

public class MapTest extends MapActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        MapView mapview = (MapView) findViewById(R.id.mapview);
        mapview.setBuiltInZoomControls(true); 
    
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
}