Bug 1854 - View.IOnTouchListener Being Ignored
Summary: View.IOnTouchListener Being Ignored
Alias: None
Product: Android
Classification: Xamarin
Component: General ()
Version: 1.9.2
Hardware: PC Windows
: Highest normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2011-11-03 09:37 UTC by Eric Malamisura
Modified: 2011-12-01 14:38 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

Attached an Example where the issue is Isolated (225.99 KB, application/octet-stream)
2011-11-06 15:09 UTC, Eric Malamisura

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Description Eric Malamisura 2011-11-03 09:37:45 UTC
In 1.2 I have several ImageButtons that I have created custom touch listeners for by inheriting from View.IOnTouchListener, I then instantiate an instance of this class, pass it into SetOnTouchListener, I do all of this on the OnCreate call in the Activity.

I haven't had a chance to pull out this behavior into an empty project and isolate the issue, but when I reverted back to 1.2 and made no code changes it all started working again.  The TouchListener OnTouch event never fires, I set a breakpoint on it and at no point does it drop into this code.  It seems to ignore it completely...

Comment 1 Jonathan Pryor 2011-11-03 10:14:57 UTC
Could I please get a sample for testing? Writing reproduction code greatly slows things down, and is time better spent investigating and fixing the dozens of other filed bugs... :-)

What I do have is a test which does:

	var textview = new TextView (this);
	textview.Touch += OnTouch;
	SetContentView (textview);

and my OnTouch method is invoked.

 - Jon
Comment 2 Eric Malamisura 2011-11-03 10:39:26 UTC
Ok I will get a sample to you when I get a chance to isolate the issue...
Comment 3 Eric Malamisura 2011-11-06 15:09:46 UTC
Created attachment 832 [details]
Attached an Example where the issue is Isolated

The example attached is very simple, it uses a ImageButton, attaches a View.IOnTouchListener which fires off a couple ToastMessages.  I would encourage you to run it using 1.2 first to see correct behavior, and then run it in 1.9.2 to see incorrect behavior (does nothing).

Comment 4 Jonathan Pryor 2011-12-01 14:38:51 UTC
I don't know why it even worked in 1.2, but it certainly shouldn't have. :-)

When implementing IJavaObject, you must inherit Java.Lang.Object:


If we fix MyTouchListener to inherit from Java.Lang.Object, the sample works:

public class MyTouchListener : Java.Lang.Object, View.IOnTouchListener
    public event EventHandler<EventArgs> OnClick;

    Context context;
    public MyTouchListener(Context ctx)
        context = ctx;

    public bool OnTouch(View v, MotionEvent e)
        switch (e.Action)
            case MotionEventActions.Down:
                Toast.MakeText(context, "Down", ToastLength.Short).Show();
                return true;
            case MotionEventActions.Up:
                Toast.MakeText(context, "Up", ToastLength.Short).Show();
                return true;
                return false;

    private void Clicked()
        if(OnClick != null)
            OnClick(this, EventArgs.Empty);