前言

之前在看別人寫自定義view作繪製的時候，看到別人家的view自帶發光效果，看起來也是蠻炫酷的，於是自己也抽出時間來試用一下，這裡做了一個模仿太陽的各種狀態樣式。

先上效果先上效果：

實現方式：

public BlurMaskFilter(float radius,Blur style) {

實現是使用的Paint類的setMaskFilter()方法，傳入BlurMaskFilter物件實現高斯模糊發光。

• float radius 設定模糊半徑
• Blur style 設定發光樣式，包括
  • Blur.INNER(內發光)，Blur.NORMAL(內外發光)
  • Blur.SOLID(外發光)，Blur.OUTER(僅外發光可見)
    

貼上程式碼

public class MaskFilterView extends View {
 private Paint lightPaint;
 private int centerX,centerY;
 /** 發光範圍 */
 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);
 }
}

總結

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