GlideActivity.java

package com.wuxiaolong.androidsamples.glide;

import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import com.wuxiaolong.androidsamples.R;

public class GlideActivity extends AppCompatActivity {
    ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_glide);
        imageView = (ImageView) findViewById(R.id.imageView);
        String imageUrl = "https://raw.githubusercontent.com/bumptech/glide/master/static/glide_logo.png";
//        String imageUrl = "http://i.kinja-img.com/gawker-media/image/upload/s--B7tUiM5l--/gf2r69yorbdesguga10i.gif";
//        Uri imageUrl = resourceIdToUri(GlideActivity.this, R.mipmap.image_test);
//        int imageUrl = R.mipmap.image_test;
        Glide.with(GlideActivity.this)
                .load(imageUrl)
                .placeholder(R.mipmap.ic_launcher) // can also be a drawable
                .error(R.mipmap.ic_launcher) // will be displayed if the image cannot be loaded
//                .skipMemoryCache(true)
                .diskCacheStrategy(DiskCacheStrategy.NONE)
//                .thumbnail(0.1f)
                .transform(new BlurTransformation(GlideActivity.this))
                .into(imageView);
    }


    public class BlurTransformation extends BitmapTransformation {

        private RenderScript rs;

        public BlurTransformation(Context context) {
            super(context);

            rs = RenderScript.create(context);
        }

        @Override
        protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
            Bitmap blurredBitmap = toTransform.copy(Bitmap.Config.ARGB_8888, true);

            // Allocate memory for Renderscript to work with
            Allocation input = Allocation.createFromBitmap(
                    rs,
                    blurredBitmap,
                    Allocation.MipmapControl.MIPMAP_FULL,
                    Allocation.USAGE_SHARED
            );
            Allocation output = Allocation.createTyped(rs, input.getType());

            // Load up an instance of the specific script that we want to use.
            ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
            script.setInput(input);

            // Set the blur radius
            script.setRadius(10);

            // Start the ScriptIntrinisicBlur
            script.forEach(output);

            // Copy the output to the blurred bitmap
            output.copyTo(blurredBitmap);

            toTransform.recycle();

            return blurredBitmap;
        }

        @Override
        public String getId() {
            return "blur";
        }
    }

    public static final String ANDROID_RESOURCE = "android.resource://";
    public static final String FOREWARD_SLASH = "/";

    /**
     * 简单的从资源 id 转换成 Uri
     */
    private static Uri resourceIdToUri(Context context, int resourceId) {
        return Uri.parse(ANDROID_RESOURCE + context.getPackageName() + FOREWARD_SLASH + resourceId);
    }
}