简书链接:追踪源码抄袭android的xml转drawable代码实现recyclerview分割线用代码是些shapeselector等等方案
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追踪源码找到了这句话,所以也可以理解为什么网上要那样写了.这其实官方就是这样写的。
那么我接下来就要手写一个recyclerview的shape分割线

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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(r);
            if (r != null) {
                ((BitmapDrawable) drawable).setTargetDensity(r.getDisplayMetrics());
            }
            break;
        case "nine-patch":
            drawable = new NinePatchDrawable();
            if (r != null) {
                ((NinePatchDrawable) drawable).setTargetDensity(r.getDisplayMetrics());
            }
            break;
        default:
            throw new XmlPullParserException(parser.getPositionDescription() +
                    ": invalid drawable tag " + name);

    }
    drawable.inflate(r, parser, attrs, theme);
    return drawable;
}

实现shape

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*/
 //在这里我们传入作为Divider的Drawable对象

 mDrawable = new GradientDrawable();

 RectShape rectShape = new RectShape();
 mDrawable.setGradientType(GradientDrawable.RECTANGLE);
 int size = DensityUtil.dip2px(context, 0.5f);
 mDrawable.setSize(size,size);
 mDrawable.setColor(Color.parseColor(colorHex));

实现selector

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public static StateListDrawable genereateSelectorDrawable(Context context, int idNormal, int idPressed, int idFocused, int idUnable) {
    StateListDrawable bg = new StateListDrawable();
    Drawable normal = idNormal == -1 ? null : context.getResources().getDrawable(idNormal);
    Drawable pressed = idPressed == -1 ? null : context.getResources().getDrawable(idPressed);
    Drawable focused = idFocused == -1 ? null : context.getResources().getDrawable(idFocused);
    Drawable unable = idUnable == -1 ? null : context.getResources().getDrawable(idUnable);
    // View.PRESSED_ENABLED_STATE_SET
    bg.addState(new int[]{android.R.attr.state_pressed, android.R.attr.state_enabled}, pressed);
    // View.ENABLED_FOCUSED_STATE_SET
    bg.addState(new int[]{android.R.attr.state_enabled, android.R.attr.state_focused}, focused);
    // View.ENABLED_STATE_SET
    bg.addState(new int[]{android.R.attr.state_enabled}, normal);
    // View.FOCUSED_STATE_SET
    bg.addState(new int[]{android.R.attr.state_focused}, focused);
    // View.WINDOW_FOCUSED_STATE_SET
    bg.addState(new int[]{android.R.attr.state_window_focused}, unable);
    // View.EMPTY_STATE_SET
    bg.addState(new int[]{}, normal);
    return bg;
}

接下来如何创建可以自行百度。