Android Glide 4.0+使用详解

repositories {
 mavenCentral()
 maven { url 'https://maven.google.com' }
}
dependencies {
  compile 'com.github.bumptech.glide:glide:4.1.1'
  annotationProcessor 'com.github.bumptech.glide:compiler:4.1.1'
}

dependencies {
 kapt 'com.github.bumptech.glide:compiler:4.1.1'
}

Glide.with(fragment)
  .load(myUrl)
  .into(imageView);

Glide.with(fragment).clear(imageView);

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
  String url = urls.get(position);
  Glide.with(fragment)
    .load(url)
    .into(holder.imageView);
}

Glide.with(fragment)
 .load(url)
 .placeholder(R.drawable.placeholder)
 .into(view);

Glide.with(fragment)
 .load(url)
 .error(R.drawable.error)
 .into(view);

 Glide.with(this)
        .load(url)
        .apply(RequestOptions.circleCropTransform())
        .into(ivTest);

 Glide.with(this)
        .load(url)
        .transition(withCrossFade())
        .into(ivTest);

GlideApp.with(fragment)
 .load(url)
 .diskCacheStrategy(DiskCacheStrategy.ALL)
 .into(imageView);

GlideApp.with(fragment)
 .load(url)
 .onlyRetrieveFromCache(true)
 .into(imageView);

GlideApp.with(fragment)
 .load(url)
 .skipMemoryCache(true)
 .into(view);

GlideApp.with(fragment)
 .load(url)
 .diskCacheStrategy(DiskCacheStrategy.NONE)
 .into(view);

GlideApp.with(fragment)
 .load(url)
 .diskCacheStrategy(DiskCacheStrategy.NONE)
 .skipMemoryCache(true)
 .into(view);

Glide.get(applicationContext).clearDiskCache();

package com.qiezzi.clinic.chengqi.common.utils;
import android.content.Context;
import android.graphics.Bitmap;
import android.support.annotation.NonNull;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import java.security.MessageDigest;
/**
 * Created by yukuoyuan on 2017/9/29.
 */
public class GlideBlurformation extends BitmapTransformation {
  private Context context;
  public GlideBlurformation(Context context) {
    this.context = context;
  }
  @Override
  protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
    return BlurBitmapUtil.instance().blurBitmap(context, toTransform, 20,outWidth,outHeight);
  }
  @Override
  public void updateDiskCacheKey(MessageDigest messageDigest) {
  }
}

package com.qiezzi.clinic.chengqi.common.utils;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
/**
 * Created by yukuoyuan on 2017/9/29.
 */
public class BlurBitmapUtil {
  private static BlurBitmapUtil sInstance;
  private BlurBitmapUtil() {
  }
  public static BlurBitmapUtil instance() {
    if (sInstance == null) {
      synchronized (BlurBitmapUtil.class) {
        if (sInstance == null) {
          sInstance = new BlurBitmapUtil();
        }
      }
    }
    return sInstance;
  }
  /**
   * @param context  上下文对象
   * @param image   需要模糊的图片
   * @param outWidth 输入出的宽度
   * @param outHeight 输出的高度
   * @return 模糊处理后的Bitmap
   */
  @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)
  public Bitmap blurBitmap(Context context, Bitmap image, float blurRadius, int outWidth, int outHeight) {
    // 将缩小后的图片做为预渲染的图片
    Bitmap inputBitmap = Bitmap.createScaledBitmap(image, outWidth, outHeight, false);
    // 创建一张渲染后的输出图片
    Bitmap outputBitmap = Bitmap.createBitmap(inputBitmap);
    // 创建RenderScript内核对象
    RenderScript rs = RenderScript.create(context);
    // 创建一个模糊效果的RenderScript的工具对象
    ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
    // 由于RenderScript并没有使用VM来分配内存,所以需要使用Allocation类来创建和分配内存空间
    // 创建Allocation对象的时候其实内存是空的,需要使用copyTo()将数据填充进去
    Allocation tmpIn = Allocation.createFromBitmap(rs, inputBitmap);
    Allocation tmpOut = Allocation.createFromBitmap(rs, outputBitmap);
    // 设置渲染的模糊程度, 25f是最大模糊度
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
      blurScript.setRadius(blurRadius);
    }
    // 设置blurScript对象的输入内存
    blurScript.setInput(tmpIn);
    // 将输出数据保存到输出内存中
    blurScript.forEach(tmpOut);
    // 将数据填充到Allocation中
    tmpOut.copyTo(outputBitmap);
    return outputBitmap;
  }
}