Bug 30094 - Issue with TapGestureRecognizer on Android
Summary: Issue with TapGestureRecognizer on Android
Status: VERIFIED FIXED
Alias: None
Product: Forms
Classification: Xamarin
Component: Android ()
Version: 1.4.0
Hardware: PC Windows
: Normal normal
Target Milestone: ---
Assignee: Chris King
URL:
Depends on:
Blocks:
 
Reported: 2015-05-14 15:39 UTC by Anubhav Ranjan
Modified: 2015-09-01 21:43 UTC (History)
7 users (show)

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

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Status:
VERIFIED FIXED

Description Anubhav Ranjan 2015-05-14 15:39:04 UTC
One of our customers is facing issues with TapGestureRecognizer in Android when set NumberOfTapsRequired = 2.
Issue exists since Forms 1.3

#Sample (Created from Sample Code):
===========
https://dl.dropboxusercontent.com/u/30949500/Xamarin%20Samples/TapGestureTest.zip

#Description:
==========
I'm having some difficulty getting the TapGestureRecognizer to work properly on Android.
The code below works fine for iOS and WinPhone. However, on Android
it only works if I set NumberOfTapsRequired to 1. When I set it to 2, I get no response when I double tap the icon.

Hope you can help.

var trashIcon = new Image { };
trashIcon.WidthRequest = 50;
trashIcon.HeightRequest = 50;
trashIcon.Source = ImageSource.FromFile("trash.png");

var tapGestureRecognizer = new TapGestureRecognizer();
tapGestureRecognizer.NumberOfTapsRequired = 2;
tapGestureRecognizer.Tapped += (s, e) =>
{
MessagingCenter.Send<ScanDataCell, string>(this, "deleteDataItem", scanLabel.Text);
};

trashIcon.GestureRecognizers.Add(tapGestureRecognizer);


#Version Info:
==========
Microsoft Visual Studio Ultimate 2013
Version 12.0.31101.00 Update 4
Microsoft .NET Framework
Version 4.5.51641

Installed Version: Ultimate

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Windows Phone SDK 8.0 - ENU   06181-004-0449004-02946
Windows Phone SDK 8.0 - ENU

ASP.NET and Web Tools   12.4.60320.0
Microsoft Web Developer Tools contains the following components:
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Browser Link: A communication channel between Visual Studio and browsers
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ASP.NET Web Frameworks and Tools 2012.2   4.1.21001.0
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ASP.NET Web Frameworks and Tools 2013   5.2.21010.0
For additional information, visit http://www.asp.net/

Common Azure Tools   1.3
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

JetBrains ReSharper Platform 6   Build 6.0.20141204.190160 on 2014-12-04 19:29:31Z
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MySQL for Visual Studio   1.2.3
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SQL Server Data Tools   12.0.50318.0
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Adds many useful features to Visual Studio for web developers.

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Xamarin   3.11.446.0 (db2a71b)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android   5.1.1.0 (3518c4ceb984ffea1f5d972ea9c09eb27738d565)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.Forms Intellisense   1.0
Provides intellisense for Xamarin.Forms in the XML editor.

Xamarin.iOS   8.10.0.0 (7741cc495ab0baf04ff0405d0604bc27f0ecae2e)
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Xamarin.iOS Unified Migration   1.0
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Xamarin.TestCloud.Integration   1.0
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Comment 1 Chris King 2015-05-19 13:34:28 UTC
Indeed. The recognizer is not firing if number of taps is 2.
Comment 2 Jason Smith [MSFT] 2015-06-26 03:30:56 UTC
Should be fixed in 1.4.4-pre1
Comment 3 Parmendra Kumar 2015-07-20 13:03:17 UTC
I have checked this issue with Xamarin.Forms 1.4.4-pre2 and its working fine at my end.

Hence closing this issue.
Comment 4 tim.ahrentlov 2015-07-29 14:36:22 UTC
Has this fix tampered with single tap? I'm getting very sluggish behaviour since I upgraded from 1.43 stable to 1.44 stable. Sometimes I need to tap twice, with a 1 sec pause to the get TapGestureRecognizer to fire.
Comment 5 Ken Pespisa 2015-09-01 21:43:48 UTC
I too am getting reports from users for the past few weeks who are claiming taps are sluggish. I've seen the issue myself, but it is intermittent and I can't figure out how to reproduce it consistently. 

My app has been in production for a year now on XF and the code for the TapGestureRecognizer hasn't ever changed.