Android自定义Application的作用

public class GlobalApp extends Application{

private UserData udata ;
public UserData getudata(){
return udata;
}
public void setudata(UserData data){
this.udata = data;
}

}

public class ExampleApplication extends Application {
@Override
public void onCreate() {
Log.d(TAG, "[ExampleApplication] onCreate");
super.onCreate();

Module.init();
}
}