map_view em branco

Mobile
#1

Olá,

estou desenvolvendo um projeto em Android e estou tentando utilizar o mapView, porem o mesmo fica em branco com linha quadriculadas.

Segue meu código fonte para melhor entendimento.

<?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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    
    <com.google.android.maps.MapView
     android:id="@+id/map_view"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:enabled="true"
     android:clickable="true"
     
     android:apiKey="MINHA_CHAVE"
	/>

</LinearLayout>
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;

import android.os.Bundle;

public class MapsActivity extends MapActivity {
	
	MapView map;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        
        map = (MapView)findViewById(R.id.map_view); 
        map.setBuiltInZoomControls(true);
    }

	@Override
	protected boolean isRouteDisplayed() {
		// TODO Auto-generated method stub
		return false;
	}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="map.view"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="7" />

    <application android:icon="@drawable/ic_launcher" android:label="@string/app_name" >
        <uses-library android:name="com.google.android.maps" />
        <activity            
            android:name=".MapsActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        	
    </application>
    
    <uses-permission android:name="android.permission.INTERNET"/>
    
    	
</manifest>
#2