android Ripple effect 点击 水波效果 自定义背景颜色

自动转换的点击效果 设置一个normal颜色即可， 在5.0以上为 ripple， 在5.0一下表现为selector;

public class RippleDrawableUtils {    /**     * for general button with ripple above 5.0 and selector lower than.     *     * @param normalColorID id for normal color     * @return backgroundDrawable     */    public static Drawable getButtonRippleBackground(            int normalColorID) {        float radius = HSDisplayUtils.dip2px(2);        int normalColor = HSApplication.getContext().getResources().getColor(normalColorID);        getRippleColor(normalColor);        return getCompatRippleDrawable(normalColor, getRippleColor(normalColor), radius);    }    public static Drawable getCompatRippleDrawable(            int normalColor, int pressedColor, float radius) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            return new RippleDrawable(getPressedColorSelector(normalColor, pressedColor),                    getShapeDrawable(normalColor, radius), getRippleMask(normalColor));        } else {            return getStateListDrawable(normalColor, pressedColor, radius);        }    }    private static int getRippleColor(int normalColor) {        int r = (int) (((normalColor >> 16) & 0xFF) * 0.8);        int g = (int) (((normalColor >> 8) & 0xFF) * 0.8);        int b = (int) (((normalColor) & 0xFF) * 0.8);        return Color.rgb(r, g, b);    }    private static ColorStateList getPressedColorSelector(int normalColor, int pressedColor) {        return new ColorStateList(                new int[][]                        {                                new int[]{android.R.attr.state_pressed},                                new int[]{android.R.attr.state_focused},                                new int[]{android.R.attr.state_activated},                                new int[]{}                        },                new int[]                        {                                pressedColor,                                pressedColor,                                pressedColor,                                normalColor                        }        );    }    private static Drawable getRippleMask(int color) {        float[] outerRadii = new float[8];        // 3 is radius of final ripple,        // instead of 3 you can give required final radius        Arrays.fill(outerRadii, 3);        RoundRectShape r = new RoundRectShape(outerRadii, null, null);        ShapeDrawable shapeDrawable = new ShapeDrawable(r);        shapeDrawable.getPaint().setColor(color);        return shapeDrawable;    }    private static StateListDrawable getStateListDrawable(            int normalColor, int pressedColor, float radius) {        StateListDrawable states = new StateListDrawable();        states.addState(new int[]{android.R.attr.state_pressed},                getShapeDrawable(pressedColor, radius));        states.addState(new int[]{android.R.attr.state_focused},                getShapeDrawable(pressedColor, radius));        states.addState(new int[]{android.R.attr.state_activated},                getShapeDrawable(pressedColor, radius));        states.addState(new int[]{},                getShapeDrawable(normalColor, radius));        return states;    }    private static GradientDrawable getShapeDrawable(int color, float radius) {        GradientDrawable shape = new GradientDrawable();        shape.setCornerRadius(radius);        shape.setColor(color);        return shape;    }