Android自定义视图onDraw

Question

I'm trying to make a control that is a composition of another controls. I've tried many ways but none seems to work... You ask why do I need that? Becaused

1. I've faced the impossibility of creating a TextView with different colors of shadow and gradient foreground

2. I want to make a volume text and it's going to be presented by this custom controls

    public class MainMenuItem extends View { private MainMenuItemHelper firstLayerItem; private MainMenuItemHelper secondLayerItem; ... @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); secondLayerItem.draw(canvas); firstLayerItem.draw(canvas); } } public class MainMenuItemHelper extends TextView { private List<DrawCommand> commands; ... @Override protected void onDraw(Canvas canvas) { for (DrawCommand command : commands) { command.draw(canvas, getPaint()); super.onDraw(canvas); } } } 

Answer 1

a control that is a composition of another controls

You need at least a Layout like RelativeLayout or LinearLayout as a View can't contain another View. You need a ViewGroup instead.

I don't know where and how you want to place it but the easiest way is to simply make a xml file containing your controls and style them like you would normally do.

A shadow color can be defined by android:shadowColor to have a shadow for your text.

Making the text itself being a gradient might be very tricky.