Android: Custom XML Layout

main.xml usually takes a 'TextView'. But what if you wanted to use a 'custom' view instead?

to do this:

1. have a class that extends a View
2. define its constructor: public CONSTR(Context, AttributeSet, int)
3. in xml type in manually

< com.domain.package.CONSTR >

etc

< / com.domain.package.CONSTR >