You could become better at Android Studio with these recommended books :-
(Program code and links below)
Learning Java by Building Android Games - https://amzn.to/2Bs3W5u
Java - A Beginner’s Guide - https://amzn.to/2A2yDyg
Beginning Android Programming with Android Studio - https://amzn.to/2SW7F2h
Android App Development for Dummies - https://amzn.to/2BpYksk
Code:-
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(int width, int height);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(int width, int height, float weight);
//For margins in DP
lp.setMargins(int left, int top, int right, int bottom);
YourViewObject.setLayoutParams(lp);
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Android Studio - Programmatically set width height and margins for TextView and other views | NatokHD