Android: ExpandableListView drawable group indicator being big when i using my own icon

I开发者_StackOverflow社区 am using this codes to set my own group indicator icon and set it to right side of the list

ExpandableListView list = (ExpandableListView) findViewById(R.id.SCHEDULE);

Drawable icon = StationInfo2.this.getResources().getDrawable(R.drawable.expander_group);

list.setGroupIndicator(icon);

list.setIndicatorBounds(list.getWidth() - 80, list.getWidth() - 40);

Its works to show my own icon but the icon shows in wrong size.

Becouse i am new here i can not post links or image to show how its looks like but i hope someone has a good idea how i can do?

You should draw it using 9-patch. http://developer.android.com/tools/help/draw9patch.html Put black pixel to the corners. that will help. (contact me if you need more info). Look at the origingal one you see black dots? make them for your image.