Set RelativeLayout layout params programmatically - throws ClassCastException

Question

I am inflating a RelativeLayout from XML and then attempting to programmatically sets its layout params and am receiving a ClassCastException.

Code:

Answer 1

The layout params have to be of the type of the parent. So if you are creating a RelativeLayout and adding it to a ListView, the layout params must be of type ListView.LayoutParams, not RelativeLayout.LayoutParams. The correct way to do it is to call inflate this way:

inflate(R.layout.mylayout, theListView, false);

This version of inflate() will correctly inflate the layout parameters (android:layout_*) defined in XML.

Answer 2

If your view is in a ListView, you must use AbsListView.LayoutParams.

See also: Unable to set margin of item in ListView using custom Adapter