Drawable体系

Android

xml文件中的对应的各项Drawable

从Resources加载资源，解析生成每个对应的Drawable

Drawable.java

public static Drawable createFromXmlInner(Resources r, XmlPullParser parser, AttributeSet attrs,
            Theme theme) throws XmlPullParserException, IOException {
        final Drawable drawable;
        final String name = parser.getName();
        switch (name) {
            case "selector":
                drawable = new StateListDrawable();
                break;
            case "animated-selector":
                drawable = new AnimatedStateListDrawable();
                break;
            case "level-list":
                drawable = new LevelListDrawable();
                break;
            case "layer-list":
                drawable = new LayerDrawable();
                break;
            case "transition":
                drawable = new TransitionDrawable();
                break;
            case "ripple":
                drawable = new RippleDrawable();
                break;
            case "color":
                drawable = new ColorDrawable();
                break;
            case "shape":
                drawable = new GradientDrawable();
                break;
            case "vector":
                drawable = new VectorDrawable();
                break;
            case "animated-vector":
                drawable = new AnimatedVectorDrawable();
                break;
            case "scale":
                drawable = new ScaleDrawable();
                break;
            case "clip":
                drawable = new ClipDrawable();
                break;
            case "rotate":
                drawable = new RotateDrawable();
                break;
            case "animated-rotate":
                drawable = new AnimatedRotateDrawable();
                break;
            case "animation-list":
                drawable = new AnimationDrawable();
                break;
            case "inset":
                drawable = new InsetDrawable();
                break;
            case "bitmap":
                drawable = new BitmapDrawable();
                break;
            case "nine-patch":
                drawable = new NinePatchDrawable();
                break;
            default:
                throw new XmlPullParserException(parser.getPositionDescription() +
                        ": invalid drawable tag " + name);
        }
        drawable.inflate(r, parser, attrs, theme);
        return drawable;
    }

在根据xml文件的跟节点解析到对应的Drawable后再由其具体的inflate来解析属性。