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关于ImageView蒙版、高斯模糊的实现方法，蒙版实现原理很简单，就是继承自ImageView绘制透明涂层，高斯模糊，可以直接使用Glide中apply() 方法实现！这两个功能我封装到了一起！如下！

效果图

自定义View

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.RequestOptions;import java.security.MessageDigest;import androidx.annotation.NonNull;import androidx.annotation.Nullable;/** * 自定义MaskImageView * * @author ThirdGoddess * @email ofmyhub@gmail.com * @Github https://github.com/ThirdGoddess * @date :2020-05-23 21:54 */@SuppressLint("AppCompatCustomView")public class MaskImageView extends ImageView {
       private Context context;    //蒙版色值    private int color = Color.parseColor("#81FFFFFF");    //是否显示蒙版    private boolean isShowMask = false;    public MaskImageView(Context context) {
           super(context);        this.context = context;    }    public MaskImageView(Context context, @Nullable AttributeSet attrs) {
           super(context, attrs);        this.context = context;    }    public MaskImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
           super(context, attrs, defStyleAttr);        this.context = context;    }       @SuppressLint("DrawAllocation")    @Override    protected void onDraw(Canvas canvas) {
           super.onDraw(canvas);        if (isShowMask) {
               canvas.drawColor(color);        }    }    /**     * 设置蒙版颜色，可以通过类似于（#81FFFFFF）来控制透明度     */    public MaskImageView setMaskColor(int color) {
           this.color = color;        return this;    }    /**     * 显示蒙版     */    public void showMask() {
           isShowMask = true;        invalidate();    }    /**     * 关闭蒙版     */    public void dismissMask() {
           isShowMask = false;        invalidate();    }    /**     * 高斯模糊处理     *     * @param radius     * @return     */    public Bitmap setGaussblur(int radius, Bitmap source) {
           if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
               RenderScript renderScript = RenderScript.create(context);            final Allocation input = Allocation.createFromBitmap(renderScript, source);            final Allocation output = Allocation.createTyped(renderScript, input.getType());            ScriptIntrinsicBlur scriptIntrinsicBlur;            scriptIntrinsicBlur = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));            scriptIntrinsicBlur.setInput(input);            scriptIntrinsicBlur.setRadius(radius);            scriptIntrinsicBlur.forEach(output);            output.copyTo(source);            renderScript.destroy();            return source;        } else {
               return source;        }    }    /**     * 开启高斯模糊     *     * @return     */    public RequestOptions setGaussBlur() {
           return RequestOptions.bitmapTransform(new GlideBlurTransformation(context));    }    /**     * 压缩Bitmap     */    public class GlideBlurTransformation extends CenterCrop {
           private Context context;        GlideBlurTransformation(Context context) {
               this.context = context;        }        @Override        protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
               Bitmap bitmap = super.transform(pool, toTransform, outWidth, outHeight);            return blurBitmap(context, bitmap, 25, (int) (outWidth * 0.2), (int) (outHeight * 0.2));        }        @Override        public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
           }    }    /**     * 模糊Bitmap处理     *     * @param context     * @param source     * @param blurRadius     * @param outWidth     * @param outHeight     * @return     */    public Bitmap blurBitmap(Context context, Bitmap source, float blurRadius, int outWidth, int outHeight) {
           if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
               Bitmap inputBitmap = Bitmap.createScaledBitmap(source, outWidth, outHeight, false);            Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);            RenderScript rs = RenderScript.create(context);            ScriptIntrinsicBlur blurScript;            blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));            Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);            Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);            blurScript.setRadius(blurRadius);            blurScript.setInput(tmpIn);            blurScript.forEach(tmpOut);            tmpOut.copyTo(outputBitmap);            return outputBitmap;        } else {
               return source;        }    }}

使用方法

设置蒙版颜色

imageView.setMaskColor(int color);//设置蒙版颜色

显示蒙版（可动态控制）

imageView.showMask();

隐藏蒙版（可动态控制）

imageView.dismissMask();

高斯模糊实现

Glide.with(Context).load(imgUrl)	.apply(imageView.setGaussBlur())//这是重点	.into(imageView);

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