ShapeBlurView
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高斯模糊蒙层库
nice job. getActivityDecorView this method, not work well on subactivity. then OnPreDrawListener will not be invoked .
android.renderscript.RSInvalidStateException: Calling RS with no Context active. at android.renderscript.RenderScript.validate(RenderScript.java:1244) at net.center.blurview.impl.AndroidStockBlurImpl.blur(AndroidStockBlurImpl.java:66) at net.center.blurview.ShapeBlurView.blur(ShapeBlurView.java:477) at net.center.blurview.ShapeBlurView$1.onPreDraw(ShapeBlurView.java:513) at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:1093)
项目里面的 minSdkVersion 16 ,与大佬的开源项目中的 minSdkVersion 19 有冲突,提示中建议用tools:overrideLibrary="net.center.blurview" 来避免这个问题,但是用了之后还是莫得效果。 
25dp模糊半径不满足UI的要求