java.lang.Object
android.content.Context
android.content.ContextWrapper
android.app.Application

//ApplicationAct繼承自Application類
public class ApplicationAct extends Application{
……//類中的代碼省略
}

<application
android:icon= "@drawable/icon"
android:label="@string/app_name"
android:name=".ApplicationAct"
<activity>
... ...
</activity>
</application>