Expandable list view move group icon indicator to right

Question

As regards to expandable list view, the group icon indicator is positioned to the left side, can I move the indicator and positioned it to the right? Thanks.

EDITED: Since I don't want to extend the view, I got this workaround of getting the width dynamically. Just sharing my solution.

Display newDisplay = getWindowManager().getDefaultDisplay(); 
int width = newDisplay.getWidth();
newListView.setIndicatorBounds(width-50, width);

Answer 1

setIndicatorBounds(int, int) does not work properly for Android 4.3. They introduced a new method setIndicatorBoundsRelative(int, int) which works ok for 4.3.

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if(android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {
       mExpandableListView.setIndicatorBounds(myLeft, myRight);
    } else {
       mExpandableListView.setIndicatorBoundsRelative(myLeft, myRight);
    }
}

Answer 2

All XML solution! I found a better way of tackling this issue. This does not require you to mess with display metrics, no need to programmatically hack it.

This is what you need to do:

1) set layout direction to right-to-left

<ExpandableListView
...
android:layoutDirection="rtl" />

2) make sure your list item layout includes this (yes, you'll need custom layout):

android:gravity="left" //to adjust the text to align to the left again
android:layoutDirection="ltr"  //OR this line, based on your layout

And you are good to go!

Answer 3

The best way to do this is below but not for all Android Version So use 2nd or third method specified below

ViewTreeObserver vto = mExpandableListView.getViewTreeObserver();

    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
                 mExpandableListView.setIndicatorBounds(mExpandableListView.getRight()- 40, mExpandableListView.getWidth());
        }
    });

or this:

@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    mExpandableListView.setIndicatorBounds(mExpandableListView.getRight()- 40, mExpandableListView.getWidth());
} 

will move that indicator to right of list view even on device and on tab also.

or you can do this in a postdelayed thread.

 (new Handler()).post(new Runnable() {

        @Override
        public void run() {
              mExpandableListView.setIndicatorBounds(mExpandableListView.getRight()- 40, mExpandableListView.getWidth());
        }
    });