Question

I want my app to be able to be run on pre Android 2.0 operating systems (namely 1.5 and 1.6). I need to include Activity.onAttachedToWindow() for 2.0 and above. How can I use reflection (or any other approach) to make my app work property on pre-2.0 Android operating systems?

Answer 1

Activity‘s onAttachedToWindow is empty. This means you can avoid calling super.onAttachedToWindow. So the easiest way would be:

@Override
public void onAttachedToWindow()
{   
     Log.e("TEST", "onAttachedToWindow");               
}

Android OS will call your onAttachedToWindow on Api Level 5+ (2.0+). And on 1.5/1.6 this function is just never called.

---

If you want to call implementation of onAttachedToWindow from super class via reflection:

@Override
public void onAttachedToWindow()
{   
    Log.e("TEST", "onAttachedToWindow");

    /* calling:
     * super.onAttachedToWindow(); 
     */
    Class<?> activityClass = (Class<?>)getClass().getSuperclass();
    try
    {
        Method superOnAttachedToWindow = activityClass.getMethod("onAttachedToWindow");
        superOnAttachedToWindow.invoke(this);
    }
    catch(InvocationTargetException ex)
    {
        //TODO: add exception handling
    }
    catch(IllegalAccessException ex)
    {
        //TODO: add exception handling;
    }
    catch(IllegalArgumentException ex)
    {
        //TODO: add exception handling
    }
    catch(NoSuchMethodException ex)
    {
        /* you are here if `onAttachedToWindow` does not exist */           
    }

}