import com.bumptech.glide.load.resource.bitmap.BitmapEncoder; //导入依赖的package包/类
private void loadFallbackPicture(Address address, ImageView imageView) {
    Context context = imageView.getContext();

    Glide.with(context)
            .using(new FallbackGlideModelLoader(), FallbackGlideParams.class)
            .from(FallbackGlideParams.class)
            .as(Bitmap.class)
            .transcode(new BitmapToGlideDrawableTranscoder(context), GlideDrawable.class)
            .decoder(new FallbackGlideBitmapDecoder(context))
            .encoder(new BitmapEncoder(Bitmap.CompressFormat.PNG, 0))
            .cacheDecoder(new FileToStreamDecoder<>(new StreamBitmapDecoder(context)))
            .diskCacheStrategy(DiskCacheStrategy.NONE)
            .load(new FallbackGlideParams(address))
            // for some reason, following 2 lines fix loading issues.
            .dontAnimate()
            .override(mPictureSizeInPx, mPictureSizeInPx)
            .into(imageView);
}
 

import com.bumptech.glide.load.resource.bitmap.BitmapEncoder; //导入依赖的package包/类
public GifFrameManager(Context context, GifDecoder decoder, Handler mainHandler,
        Transformation<Bitmap> transformation) {
    this.context = context;
    this.decoder = decoder;
    this.mainHandler = mainHandler;
    this.transformation = transformation;
    calculator = new MemorySizeCalculator(context);
    frameLoader = new GifFrameModelLoader();
    frameResourceDecoder = new GifFrameResourceDecoder();

    if (!decoder.isTransparent()) {
        // For non transparent gifs, we can beat the performance of our gif decoder for each frame by decoding jpegs
        // from disk.
        cacheDecoder = new StreamBitmapDecoder(context);
        encoder = new BitmapEncoder(Bitmap.CompressFormat.JPEG, 70);
    } else {
        // For transparent gifs, we would have to encode as pngs which is actually slower than our gif decoder so we
        // avoid writing frames to the disk cache entirely.
        cacheDecoder = NullCacheDecoder.get();
        encoder = SkipCache.get();
    }
}
 

import com.bumptech.glide.load.resource.bitmap.BitmapEncoder; //导入依赖的package包/类
/**
 * Sets the value for key
 * {@link com.bumptech.glide.load.resource.bitmap.BitmapEncoder#COMPRESSION_FORMAT}.
 */
@CheckResult
public RequestOptions encodeFormat(@NonNull Bitmap.CompressFormat format) {
  return set(BitmapEncoder.COMPRESSION_FORMAT, Preconditions.checkNotNull(format));
}
 

import com.bumptech.glide.load.resource.bitmap.BitmapEncoder; //导入依赖的package包/类
/**
 * Sets the value for key
 * {@link BitmapEncoder#COMPRESSION_QUALITY}.
 */
@CheckResult
public RequestOptions encodeQuality(@IntRange(from = 0, to = 100) int quality) {
  return set(BitmapEncoder.COMPRESSION_QUALITY, quality);
}
 

import com.bumptech.glide.load.resource.bitmap.BitmapEncoder; //导入依赖的package包/类
/**
 * Sets the value for key
 * {@link com.bumptech.glide.load.resource.bitmap.BitmapEncoder#COMPRESSION_FORMAT}.
 */
public RequestOptions encodeFormat(@NonNull Bitmap.CompressFormat format) {
  return set(BitmapEncoder.COMPRESSION_FORMAT, Preconditions.checkNotNull(format));
}
 

import com.bumptech.glide.load.resource.bitmap.BitmapEncoder; //导入依赖的package包/类
/**
 * Sets the value for key
 * {@link BitmapEncoder#COMPRESSION_QUALITY}.
 */
public RequestOptions encodeQuality(int quality) {
  return set(BitmapEncoder.COMPRESSION_QUALITY, quality);
}