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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