Android Question DraggableView view is not working on my new tablet


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I've built a drag n drop application for my kid using Erel's example here. It's working fine with our old tablets (Samsung, Lenovo --> All below android 5.x ).

However We have just upgraded out tablet to be Lenovo yoga Tab 3 which is android 5.1.
After installed and run that application on a new device, Drag and drop feature is no more working (others features are still working fine) and no error message shown.

Could someone help me solve this problem.