ClassCastException when adding LayoutParams

Question

Which class do I have to use, when setting the LayoutParams of my LinearLayout? The following two are not working:

linLayout.setLayoutParams(new ViewGroup.LayoutParams(50,50));
linLayout.setLayoutParams(new android.widget.LinearLayout.LayoutParams(50,50));

if I get the params first, change them and set them back it's working. So I suppose the Params I get returned inherit from ViewGroup.LayoutParams...

Any idea? THX

Daniel Novak · Accepted Answer · 2011-07-26 13:10:41Z

12

Use the LayoutParams of the parent. So in case your LinearLayout is a child of RelativeLayout then you use linLayout.setLayoutParams(new android.widget.RelativeLayout.LayoutParams(50,50));

answered Jul 26, 2011 at 13:10

Daniel Novak

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4 Comments

Frempe Over a year ago

crazy, thats cool :) why use these params and not the LinearLayout params?

Daniel Novak Over a year ago

I don't know an exact answer, but LayoutParams are used by views to tell their parents how they want to be laid out. And this is parent specific (depends on the parent Layout type). So also when you are you are casting linlayout.getLayoutParams, cast it to (RelativeLayout.LayoutParams) in this case.

Johann Over a year ago

That is one of the stupidess designs I've ever seen. Setting it on the parent? Seriously, WTF?

M. Usman Khan Over a year ago

@AndroidDev :/ u need to understand it a little more

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