Android ImageView蒙版、高斯模糊

效果图

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自定义View

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package com.chengyinan.tests;

import android.annotation.SuppressLint;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.os.Build;

import android.renderscript.Allocation;

import android.renderscript.Element;

import android.renderscript.RenderScript;

import android.renderscript.ScriptIntrinsicBlur;

import android.util.AttributeSet;

import android.widget.ImageView;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;

import com.bumptech.glide.load.resource.bitmap.CenterCrop;

import com.bumptech.glide.request.RequestOptio