Android如何绘制发光效果详解

前言

之前在看别人写自定义view作绘制的时候，看到别人家的view自带发光效果，看起来也是蛮炫酷的，于是自己也抽出时间来试用一下，这里做了一个模仿太阳的各种状态样式。

先上效果先上效果：

实现方式：

public blurmaskfilter(float radius, blur style) {

实现是使用的paint类的setmaskfilter()方法，传入blurmaskfilter对象实现高斯模糊发光。

float radius 设置模糊半径
blur style 设置发光样式，包括
- blur.inner(内发光)，blur.normal(内外发光)
- blur.solid(外发光)，blur.outer(仅外发光可见)

贴上代码

public class maskfilterview extends view {
 private paint lightpaint;
 private int centerx, centery;
 /** 发光范围 */
 private int radioradius = 70;

 public maskfilterview(context context) {
 super(context);
 init();
 }

 public maskfilterview(context context, @nullable attributeset attrs) {
 super(context, attrs);
 init();
 }

 private void init() {
 lightpaint = new paint();
 setlayertype(layer_type_software, null);
 lightpaint.setcolor(color.parsecolor("#ec3e3e"));
 lightpaint.setmaskfilter(new blurmaskfilter(radioradius, blurmaskfilter.blur.inner));
 }

 @override
 protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
 centerx = getleft() + getmeasuredwidth()/2;
 centery = gettop() + getmeasuredheight()/2;
 super.onmeasure(widthmeasurespec, widthmeasurespec);
 }

 public void setblurtype(int blurtype) {
 switch (blurtype) {
  case 0:
  lightpaint.setmaskfilter(new blurmaskfilter(radioradius, blurmaskfilter.blur.inner));
  break;
  case 1:
  lightpaint.setmaskfilter(new blurmaskfilter(radioradius, blurmaskfilter.blur.normal));
  break;
  case 2:
  lightpaint.setmaskfilter(new blurmaskfilter(radioradius, blurmaskfilter.blur.solid));
  break;
  case 3:
  lightpaint.setmaskfilter(new blurmaskfilter(radioradius, blurmaskfilter.blur.outer));
  break;
 }

 invalidate();
 }

 @override
 protected void ondraw(canvas canvas) {
 super.ondraw(canvas);

 canvas.drawcircle(centerx, centery, 150, lightpaint);
 }
}

总结

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