Android :: Cannot Display Google Maps In Application

I'm trying to display GoogleMaps in my application, but instead of map I just get an empty screen with crosses and Google logo in the bottom left corner. I'm using Internet permission in manifest file, just as the library "com.google.android.maps". I have also supported my application with Android Maps API key and I placed it in layout as android:apiKey value for MapView, but it still can't display the map.

main.xml:
<com.google.android.maps.MapView android:id="@+id/myMapView"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:enabled="true" android:clickable="true"
android:apiKey="07vNiwHa094tV14bUdyK0VTtXx0eeAZlk6WdKXQ" />

manifest.xml:
<uses-library android:name="com.google.android.maps" /> ...
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

I have used two different API Key values, regarding whether I signed the application with debug or my own created keystore, but it didn't work with none of them.