Hierarchical design of SuperTextView

In SuperTextView, the drawing content is divided into 4 levels. Understanding the hierarchical design in SuperTextView will help developers organize UI logic more reasonably.

1.Native Background layer: Originated from the View's own Background background layer.

2.SuperTextView Background layer：That is, the solid background layer set by app:stv_solid. This layer is usually treated as a background layer in SuperTextView instead of View's Background. When we set the background layer color, the View's own Background will be overwritten.

3.Drawable layer：The level at which Drawable of SuperTextView is located. If you want to display the image via SuperTextView, it is displayed on that layer. Starting with the v2.0 version, SuperTextView's 1 Drawable can be supported as a background image for SuperTextView, which means when the developer is like this When done, the background color set by the solid property will be overwritten.

4.Text layer: The level at which the text is drawn.