On Apr 10, 2012, at 2:07 PM, King Coffee wrote:
> I'm trying to convert an android java example code snippet to a C# code
> snippet. The java snippet uses Enums like: MotionEvent.ACTION_MASK and
> MotionEvent.ACTION_DOWN.
Those were moved to the Android.Views.MotionEventActions enumeration, which is
also the type of the MotionEvent.Action property.
Within MonoDevelop (and presumably Visual Studio) if you do:
eve.Action ==
the IDE will suggest MotionEventActions values. (Not sure why MonoDevelop
doesn't suggest those values when using `&`...)
> So, how and I fix the code snippet below:
>
> public override bool OnTouchEvent(MotionEvent eve)
> {
> base.OnTouchEvent(eve);
>
> int action = eve.Action & MotionEvent.ACTION_MASK;
var action = e.Action & MotionEventActions.Mask;
// or: var action = e.ActionMasked;
switch (action) {
case MotionEventActions.Down: ...
case MotionEventActions.Move: ...
}
> I defined a generic image GestureListener of the form:
>
> public class MyImageListener
You don't list any base classes, yet...
> public override bool OnTouchEvent(MotionEvent eve)
you're overriding a method? I'm not sure how that works. ;-)
One thing to keep in mind: when implementing Android interfaces, in particular
when implementing IJavaObject, DO NOT IMPLEMENT IJavaObject! Subclass
Java.Lang.Object instead:
http://docs.monodroid.net/index.aspx?link=T:Android.Runtime.IJavaObject
http://docs.xamarin.com/android/advanced_topics/architecture/android_callable_wrappers
Failure to do so will result in weird runtime errors, frequently resembling
NullPointerExceptions (assuming the common approach of making
IJavaObject.Handle return IntPtr.Zero...).
- Jon
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