Glide的缓存资源分为两种:

1.原图(SOURCE) :原始图片
2.处理图(RESULT) :经过压缩和变形等处理后的图片

磁盘缓存策略(diskCacheStrategy)

1.ALL:缓存原图(SOURCE)和处理图(RESULT)
2.NONE:什么都不缓存
3.SOURCE:只缓存原图(SOURCE)
4.RESULT:只缓存处理图(RESULT) —默认值

内存缓存：

glide默认使用了内存缓存，需要不使用内存缓存，调用
Glide.with(this).load(mUrl).skipMemoryCache(true).into(mIv);

清除内存缓存：

Glide.get(this).clearMemory();

清除磁盘缓存：

Glide.get(MainActivity.this).clearDiskCache();

演示图：从上到下依次为加载默认图、圆形图、圆角图、指定尺寸图、高斯模糊图、gif图。

Glide加载演示

引入依赖：

    implementation 'com.github.bumptech.glide:glide:4.8.0'

图片加载工具类：

/**
 * create by libo
 * create on 2018/12/26
 * description Glide图片加载工具类
 */
public class ImageLoaderManager {

    /**
     * 默认加载方式
     *
     * @param context
     * @param url
     * @param imageView
     */
    public static void loadImage(Context context, String url, ImageView imageView) {
        RequestOptions requestOptions = new RequestOptions()
                .priority(Priority.HIGH)
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .dontAnimate();

        Glide.with(context)
                .load(url)
                .apply(requestOptions)
                .transition(DrawableTransitionOptions.withCrossFade())
                .into(imageView);
    }

    /**
     * 加载圆形图片
     *
     * @param context
     * @param url
     * @param imageView
     */
    public static void loadCircleImage(Context context, String url, ImageView imageView) {
        RequestOptions requestOptions = new RequestOptions()
                .priority(Priority.HIGH)
                .dontAnimate()
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .bitmapTransform(new CircleCrop());

        Glide.with(context)
                .load(url)
                .apply(requestOptions)
                .transition(DrawableTransitionOptions.withCrossFade())
                .into(imageView);
    }

    /**
     * 加载圆角图片
     * @param context
     * @param url
     * @param imageView
     * @param radius 圆角大小
     */
    public static void loadRoundImage(Context context, String url, ImageView imageView, int radius) {
        RequestOptions requestOptions = new RequestOptions()
                .priority(Priority.HIGH)
                .dontAnimate()
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .transforms(new CenterCrop(), new RoundedCorners(radius));

        Glide.with(context)
                .load(url)
                .apply(requestOptions)
                .transition(DrawableTransitionOptions.withCrossFade())
                .into(imageView);
    }

    /**
     * 加载图片指定大小
     *
     * @param context
     * @param url
     * @param imageView
     * @param width
     * @param height
     */
    public static void loadSizeImage(Context context, String url, ImageView imageView, int width, int height) {
        RequestOptions requestOptions = new RequestOptions()
                .priority(Priority.HIGH)
                .override(width, height)
                .diskCacheStrategy(DiskCacheStrategy.RESOURCE);

        Glide.with(context)
                .load(url)
                .apply(requestOptions)
                .transition(DrawableTransitionOptions.withCrossFade())
                .into(imageView);
    }

    /**
     * 加载本地图片文件
     *
     * @param context
     * @param file
     * @param imageView
     */
    public static void loadFileImage(Context context, File file, ImageView imageView) {
        RequestOptions requestOptions = new RequestOptions()
                .priority(Priority.HIGH)
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .centerCrop();

        Glide.with(context)
                .load(file)
                .apply(requestOptions)
                .into(imageView);
    }

    /**
     * 加载高斯模糊
     *
     * @param context
     * @param url
     * @param imageView
     * @param radius      模糊级数 最大25
     */
    public static void loadBlurImage(Context context, String url, ImageView imageView, int radius) {
        RequestOptions requestOptions = new RequestOptions()
                .override(300)
                .transforms(new BlurTransformation(radius));

        Glide.with(context)
                .load(url)
                .apply(requestOptions)
                .transition(DrawableTransitionOptions.withCrossFade())
                .into(imageView);
    }

    /**
     * 加载gif图
     * @param context
     * @param url
     * @param imageView
     */
    public static void loadGifImage(Context context, String url, ImageView imageView) {
        Glide.with(context)
                .load(url)
                .into(imageView);
    }
}

activity调用代码：

public class MainActivity extends AppCompatActivity {
    private ImageView ivDefault;
    private ImageView ivCircle;
    private ImageView ivRound;
    private ImageView ivSize;
    private ImageView ivBlur;
    private ImageView ivGif;
    private String url = "http://5b0988e595225.cdn.sohucs.com/images/20181129/b927a5afe1854667a5cf9b09dcebb1ee.jpeg";
    private String gifUrl = "https://upload-images.jianshu.io/upload_images/8669504-930fc652956b3f0e.gif";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        loadImage();
    }

    private void initView() {
        ivDefault = findViewById(R.id.iv_default);
        ivCircle = findViewById(R.id.iv_circle);
        ivRound = findViewById(R.id.iv_round);
        ivSize = findViewById(R.id.iv_size);
        ivBlur = findViewById(R.id.iv_blur);
        ivGif = findViewById(R.id.iv_gif);
    }

    private void loadImage() {
        ImageLoaderManager.loadImage(getApplicationContext(), url, ivDefault);

        ImageLoaderManager.loadCircleImage(getApplicationContext(), url, ivCircle);

        ImageLoaderManager.loadRoundImage(getApplicationContext(), url, ivRound, 20);

        ImageLoaderManager.loadSizeImage(getApplicationContext(), url, ivSize, 150, 150);

        ImageLoaderManager.loadBlurImage(getApplicationContext(), url, ivBlur, 10);

        ImageLoaderManager.loadGifImage(getApplicationContext(), gifUrl, ivGif);
    }
}

调用ImageLoaderManager工具类对应方法即可，完整代码在github代码直通车。