前言

之前在看別人寫自定義view作繪制的時候，看到別人家的view自帶發光效果，看起來也是蠻炫酷的，于是自己也抽出時間來試用一下，這里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對象實現高斯模糊發光。

float radius 設置模糊半徑 Blur style 設置發光樣式，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)

貼上代碼

public class MaskFilterView extends View { private Paint lightPaint; private int centerX, centerY; /** 發光范圍 */ 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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