Question

I have another class other than my main class, and inside this I want to add a layout programmatically with:

myLayout = new RelativeLayout(this);

But it crashes the app, why?

Answer 1

You need to add the layout params for the app. Right now your relative layout has no width or height.

ViewGroup.LayoutParams lp = new 
        LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);

myLayout = new RelativeLayout(this);
myLayout.setLayoutParams(lp);

This should work. if it doesnt put your stacktrace.