Exactly how dangerous is this?

gistfile1.txt

// MyApplication.java
public class MyApplication extends Application {

    private MyApplication sInstance;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        init(this);
    }

    private static void init(MyApplication app) {
        sInstance = app;
    }

    public static MyApplication getInstance() {
        return sInstance;
    }
}


// SomeActivity.java
public class SomeActivity extends Activity {
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
      
        SomeObject o = new SomeObject();
        o.doWork();
    }
}



// SomeObject.java
public class SomeObject {

    public void doWork() {
        // ...
        MyApplication app = MyApplication.getInstance();
        // ...
    }
}