追踪源码抄袭android的xml转drawable代码实现recyclerview分割线-用代码是些shape selector 等等方案都在这里啦。

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

    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

       */
        //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

    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。