TWiStErRob

class DrawableBitmapResourceDecoder implements ResourceDecoder<Drawable, Bitmap> {
	private final BitmapPool pool;
	public DrawableBitmapResourceDecoder(Context context) {
		this(Glide.get(context).getBitmapPool());
	}
	public DrawableBitmapResourceDecoder(BitmapPool pool) {
		this.pool = pool;
	}

	@Override public Resource<Bitmap> decode(Drawable drawable, int width, int height) throws IOException {

TWiStErRob

class DrawableResoureDecoder implements ResourceDecoder<Drawable, Drawable> {
	@Override public Resource<Drawable> decode(Drawable source, int width, int height) throws IOException {
		return new DrawableResource<Drawable>(source) {
			@Override public int getSize() { return 1; }
			@Override public void recycle() { }
		};
	}
	@Override public String getId() { return "DrawableDrawableResourceDecoder"; }
}

TWiStErRob

import java.io.File;
import android.content.Context;
import com.bumptech.glide.load.engine.cache.*;

public final class ExternalCacheDiskCacheFactory implements DiskCache.Factory {
	private final Context context;
	private final String diskCacheName;
	private final int diskCacheSize;

	public ExternalCacheDiskCacheFactory(Context context, int diskCacheSize) {

TWiStErRob

    public static boolean isFOSHoldingOnToFile() {
        return !canDeleteCreatedFile() || !canRenameCreatedFile();
    }

    public static boolean canDeleteCreatedFile() {
        File temp = null;
        try {
            temp = File.createTempFile("canDeleteCreatedFile", null, Robolectric.application.getCacheDir());
            if(!temp.delete()) {
                return false;