Android如何绘制发光效果详解
时间：2020-07-26 18:01:01|栏目：|点击： 次
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
