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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