Understanding Android Handling of Touch Events
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Showing how Android handles Touch Events by means of extending an ExpandableListView with a swipe gesture. I am explaining which problems I encountered and how I solved them.
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Understanding Android Handling of Touch Events
- 1. Understanding Android Handling of Touch Events by Jens Mohrmann jens@mohrmann-it.com google.com/+JensMohrmann
- 2. Quick CV • TU Berlin Computer Science Diploma 1986 • Freelance Consultant since 1993 (Hospitality, Banking) • Android Programming since 4/2014
- 3. My Task Implement a restaurant check split screen to easily select order items. Use ExpandableListView to represent restaurant check. ExpandableListView_1
- 4. My Task Implement a Swipe Gesture such as Swipe from left to right select one order Swipe from right to left unselect one order
- 5. Android Touch Events • ACTION_DOWN • ACTION_UP • ACTION_MOVE • ACTION_POINTER_DOWN • ACTION_POINTER_UP • ACTION_CANCEL Gesture always starts with ACTION_DOWN
- 6. Implementation Swipe Implement a View.OnTouchListener Other alternative is subclassing from ExpandableListView and override onTouch() ExpandableListView_2
- 7. Error Analysis After applying TouchListener, collapse/expand and scroll don‘t work any more.
- 10. Final Solution Events need to be handled on ExpandableListView and not on the item ViewGroup level to harmonize between scroll and swipe ExpandableListView_3
- 11. End of Presentation Thank you for your attention Presentation can be found on http://www.slideshare.net/jensmohr/underst anding-android-handling-of-touch-events Source Code on Github https://github.com/pontisoft/ExpandableListVie w_1 2 and 3