Bug 1776 - Add HandleMessage event for Android.OS.Handler
Summary: Add HandleMessage event for Android.OS.Handler
Status: RESOLVED FIXED
Alias: None
Product: Android
Classification: Xamarin
Component: BCL Class Libraries ()
Version: 1.0
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2011-10-28 16:27 UTC by Jonathan Pobst
Modified: 2011-10-31 15:35 UTC (History)
2 users (show)

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

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Status:
RESOLVED FIXED

Description Jonathan Pobst 2011-10-28 16:27:21 UTC
Android.OS.Handler needs an event added for HandleMessage (Message msg).  This is a common pattern in Android:

        mProgressHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);

                mProgress++;
                mProgressDialog.incrementProgressBy(1);
                mProgressHandler.sendEmptyMessageDelayed(0, 100);
            }
        };

However, we can't do this in C#, so we have to create a whole new class that overrides HandleMessage, and that class can't access the parent's variables, so we have to pass in an instance of the parent.  It's a mess.

An event would allow this:

mProgressHandler = new Handler ();
mProgressHandler.HandleMessage += delegate { (o, e) =>
    mProgress++;
    mProgressDialog.incrementProgressBy (1);
    mProgressHandler.sendEmptyMessageDelayed (0, 100);
}
Comment 1 Jonathan Pryor 2011-10-31 15:35:20 UTC
Fixed in a4d1089c by adding a Handler(Action<Message>) constructor.

This allows usage such as:

    mProgressHandler = new Handler(m => {
        mProgress++;
        mProgressDialog.IncrementProgressBy (1);
        mProgressHandler.SendEmptyMessageDelayed (0, 100);
    });