Tuesday, August 26, 2014

How to stop double tap or multi tap problem in android Xamarin

It is a common problem for android or any mobile developer, to stop unwanted multi tap in a button or view. This may cause blockers and crashes also. So, it’s a kind of serious and common issue. To fix this there are multiple solutions you can approach to. You can use timer or you can track down view event or even you can use a flag also. But again you have to change the flag after the button click occurrence. You can assign a different handler after first click. But also again you have to assign the real handler after the click occurs. All these may not give you 100% solution; as well it can be another piece of code for a new error.
Here I found a solution which may solve this issue in much secure and smart way.

Note: Same idea will work for Android Java developers.

Let get in to it-

Step 1: Create SingleClickListener class, with following code.

public  class SingleClickListener
    {
        public SingleClickListener(Action<object, EventArgs> setOnClick)
        {
            _setOnClick = setOnClick;
        }
        private bool hasClicked;

        private Action<object, EventArgs> _setOnClick;

        public void OnClick(object v, EventArgs e)
        {
            if (!hasClicked)
            {
                _setOnClick(v, e);
                hasClicked = true;
            }
            reset();
        }
      
        private void reset()
        {
            Android.OS.Handler mHandler = new Android.OS.Handler();
            mHandler.PostDelayed(new Action(() => { hasClicked = false; }), 500);
        }
    }

Step2: Use it everywhere you need it, in following way-

Button myButton= FindViewById<Button> (Resource.Id.myButton);
myButton.Click += new SingleClickListener( myButtonClickEvent).OnClick;
void myButtonClickEvent (object sender, EventArgs e)
{
//your button click code goes here.
}


That’s it. :)
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