酷炫的日间夜间模式切换按钮

前言

最近看到一个酷炫的日间夜间模式切换按钮，于是就动手写了仿写了一个。
这里是Github链接，欢迎star,fork...
PO上效果图，录制的不太好

主要的编写思路

这里主要是用属性动画中的ValueAnimator来产生具有一组有规律数字，然后主要绘制日间模式（云朵跳动的效果），夜间模式（星星闪烁的效果，月亮逆向旋转的效果），全局设计有四种固定的模式（SWITCH_ANIMATION_OFF, SWITCH_ANIMATION_ON, SWITCH_ON, SWITCH_OFF）分别对应着按钮动画关闭，按钮动画打开，打开，关闭，这几种具体的状态。

一、日间模式

主要分为日间模式打开状态。

private void drawSwitchOn(Canvas canvas) {
        float[] rectAttrs = compRoundRectAttr(SWITCH_OFF_POS);
        drawRoundRect(canvas, switchOnColor, rectAttrs);//按钮主题的背景

        float[] ovalAttrs = compOvalAttr(SWITCH_ON_POS);
        drawOval(canvas, spotOnColor, ovalAttrs);//绘制太阳
        drawOvalIn(canvas, spotOnColorIn, ovalAttrs);
        drawCloud(canvas, 1);//绘制云朵

        drawRoundRectStroke(canvas, DEFAULT_SWITCH_ON_COLOR_OUT);
    }

日间模式动画打开状态。

private void drawSwitchOnAnim(Canvas canvas) {
        float[] rectAttrs = compRoundRectAttr(SWITCH_OFF_POS);
        drawRoundRect(canvas, switchOnColor, rectAttrs);

        rectAttrs = compRoundRectAttr(currentPos);
        drawRoundRect(canvas, switchOffColor, rectAttrs);

        float[] ovalShadeOnAttrs = compRoundRectShadeOnAttr(currentPos * 3/2);
        float[] ovalAttrs = compOvalAttr(currentPos* 3/2);
        int color = compColor(currentPos, DEFAULT_SPOT_OFF_COLOR, DEFAULT_SPOT_ON_COLOR);
        int colorIn = compColor(currentPos, DEFAULT_SPOT_OFF_COLOR_IN, DEFAULT_SPOT_ON_COLOR_IN);
        drawRoundRect(canvas, color, ovalShadeOnAttrs);
        drawOval(canvas, color, ovalAttrs);
        drawOvalIn(canvas, colorIn, ovalAttrs);
        if(currentPos > 0.6) {
            drawCloud(canvas, currentPos);//云朵的动态效果
        }

        int strokeColor = compColor(currentPos, DEFAULT_SWITCH_OFF_COLOR_OUT, DEFAULT_SWITCH_ON_COLOR_OUT);
        drawRoundRectStroke(canvas, strokeColor);
    }

二、夜间模式

主要分为夜间模式打开状态。

float[] rectAttrs = compRoundRectAttr(SWITCH_OFF_POS);
        drawRoundRect(canvas, switchOffColor, rectAttrs);

        float[] ovalAttrs = compOvalAttr(SWITCH_OFF_POS);
        drawOval(canvas, spotOffColor,  ovalAttrs);
        drawOvalIn(canvas, spotOffColorIn, ovalAttrs);
        drawCircleDot(canvas, spotOffColor, spotOffColorIn, 1, ovalAttrs);
        drawCircleDot2(canvas, spotOffColor, spotOffColorIn, 1, ovalAttrs);//绘制月亮上的原点
        drawCircleDot3(canvas, spotOffColor, spotOffColorIn, 1, ovalAttrs);//绘制月亮上的原点
        drawStar(canvas, DEFAULT_SPOT_OFF_COLOR_IN, 1);//绘制星星

        drawRoundRectStroke(canvas, DEFAULT_SWITCH_OFF_COLOR_OUT);

主要分为夜间模式动画打开状态。

float[] rectAttrs = compRoundRectAttr(SWITCH_OFF_POS);
        if (currentPos != 1) {
            drawRoundRect(canvas, switchOffColor, rectAttrs);
        }
        //夜间模式的背景
        rectAttrs = compRoundRectAttr(1 - currentPos);
        drawRoundRect(canvas, switchOffColor, rectAttrs);

        float[] ovalAttrs;
        if(currentPos > 2.0/3){
            ovalAttrs = compOvalAttr(0);
        }else{
            ovalAttrs = compOvalAttr(1 - currentPos * 3/2);
        }
        float[] ovalShadeOffAttrs = compRoundRectShadeOffAttr(1 - currentPos * 3/2);
        int color = compColor(currentPos, DEFAULT_SPOT_ON_COLOR, DEFAULT_SPOT_OFF_COLOR);
        int colorIn = compColor(currentPos, DEFAULT_SPOT_ON_COLOR_IN, DEFAULT_SPOT_OFF_COLOR_IN);
        drawRoundRect(canvas, color, ovalShadeOffAttrs);
        drawOval(canvas, color, ovalAttrs);
        drawOvalIn(canvas, colorIn, ovalAttrs);
        drawCircleDot(canvas, DEFAULT_SPOT_OFF_COLOR, DEFAULT_SPOT_OFF_COLOR_IN, currentPos, ovalAttrs);//绘制月亮上的动态旋转的原点
        drawCircleDot2(canvas, DEFAULT_SPOT_OFF_COLOR, DEFAULT_SPOT_OFF_COLOR_IN, currentPos, ovalAttrs);
        drawCircleDot3(canvas, DEFAULT_SPOT_OFF_COLOR, DEFAULT_SPOT_OFF_COLOR_IN, currentPos, ovalAttrs);
        if(currentPos > 0.6) {
            drawStar(canvas, DEFAULT_SPOT_OFF_COLOR_IN, currentPos);//绘制闪烁的星星
        }

        int strokeColor = compColor(currentPos, DEFAULT_SWITCH_ON_COLOR_OUT, DEFAULT_SWITCH_OFF_COLOR_OUT);
        drawRoundRectStroke(canvas, strokeColor);

最后

具体的代码见我的Github，先写这么多，有空再来继续补全文章。这里是Github链接，欢迎star,fork...谢谢