Expandable listview setselectionfromTop with animation and padding

Question

I enabled animation(expand and contract) to default android'd expandable listview using this https://github.com/idunnololz/AnimatedExpandableListView/blob/master/src/com/idunnololz/widgets/AnimatedExpandableListView.java.

However, the one limitation that I am facing is to move the current expanded click to the top.

I tried setSelectionFromTop(groupPosition, 0)

Here is the question:
- How to add animation to bringing it to the top?
- How to bring it to a top to a specific height. Lets say below 10px from the top.

Any pointers would be amazing.

Note: The solution should work from sdk 14 and above.

Answer 1

Any pointers would be amazing.

You can use android-advancedrecyclerview. The recycler view itself is a powerful widget that has a lot of features but for your question you can take a look at MyExpandableItemAdapter.java.

• How to add animation to bringing it to the top?

public void scrollToPosition (int position)

public void smoothScrollToPosition (int position)

• How to bring it to a top to a specific height. Lets say below 10px from the top.

public void scrollBy (int x, int y)

public void smoothScrollBy (int dx, int dy)

Answer 2

This with surely work with the library you used, i tired from my own let me know you need a sample.

long packedPosition = mListView.getPackedPositionForGroup(groupPosition);

final long flatpostion = mListView.getFlatListPosition(packedPosition);



expandableListView.expandGroupWithAnimation(groupPosition);



new Handler().postDelayed(new Runnable() {

    @Override

    public void run() {

        getActivity().runOnUiThread(new Runnable() {

            @Override

            public void run() {

                mListView.smoothScrollToPositionFromTop((int) flatpostion, HomeActivity.LIST_HEADER_HEIGHT, 200);

            }

        });

    }

}, 300);

Answer 3

• You can use ListView's setSelection(int position) method to scroll to a row.
  
• You could use ListView's smoothScrollToPosition(int position) to scroll to a particular location in the list.