/**
 * Set the target the resource will be loaded into.
 *
 * @see Glide#clear(Target)
 *
 * @param target The target to load the resource into.
 * @return The given target.
 */
public <Y extends Target<TranscodeType>> Y into(Y target) {
    Util.assertMainThread();
    if (target == null) {
        throw new IllegalArgumentException("You must pass in a non null Target");
    }
    if (!isModelSet) {
        throw new IllegalArgumentException("You must first set a model (try #load())");
    }

    Request previous = target.getRequest();

    if (previous != null) {
        previous.clear();
        requestTracker.removeRequest(previous);
        previous.recycle();
    }

    Request request = buildRequest(target);
    target.setRequest(request);
    lifecycle.addListener(target);
    requestTracker.runRequest(request);

    return target;
}
 

/**
 * Starts tracking the given request.
 */
public void runRequest(Request request) {
    requests.add(request);
    if (!isPaused) {
        request.begin();
    } else {
        pendingRequests.add(request);
    }
}
 

/**
 * Stops any in progress requests.
 */
public void pauseRequests() {
    isPaused = true;
    for (Request request : Util.getSnapshot(requests)) {
        if (request.isRunning()) {
            request.pause();
            pendingRequests.add(request);
        }
    }
}
 

/**
 * Starts any not yet completed or failed requests.
 */
public void resumeRequests() {
    isPaused = false;
    for (Request request : Util.getSnapshot(requests)) {
        if (!request.isComplete() && !request.isCancelled() && !request.isRunning()) {
            request.begin();
        }
    }
    pendingRequests.clear();
}
 

/**
 * Cancels all requests and clears their resources.
 */
public void clearRequests() {
    for (Request request : Util.getSnapshot(requests)) {
        request.clear();
    }
    pendingRequests.clear();
}
 

/**
 * Restarts failed requests and cancels and restarts in progress requests.
 */
public void restartRequests() {
    for (Request request : Util.getSnapshot(requests)) {
        if (!request.isComplete() && !request.isCancelled()) {
            // Ensure the request will be restarted in onResume.
            request.pause();
            if (!isPaused) {
                request.begin();
            } else {
                pendingRequests.add(request);
            }
        }
    }
}
 

/**
 * Cancel any pending loads Glide may have for the target and free any resources (such as {@link Bitmap}s) that may
 * have been loaded for the target so they may be reused.
 *
 * @param target The Target to cancel loads for.
 */
public static void clear(Target<?> target) {
    Util.assertMainThread();
    Request request = target.getRequest();
    if (request != null) {
        request.clear();
        target.setRequest(null);
    }
}
 

private Request obtainRequest(Target<TranscodeType> target, float sizeMultiplier, Priority priority,
        RequestCoordinator requestCoordinator) {
    return GenericRequest.obtain(
            loadProvider,
            model,
            signature,
            context,
            priority,
            target,
            sizeMultiplier,
            placeholderDrawable,
            placeholderId,
            errorPlaceholder,
            errorId,
            fallbackDrawable,
            fallbackResource,
            requestListener,
            requestCoordinator,
            glide.getEngine(),
            transformation,
            transcodeClass,
            isCacheable,
            animationFactory,
            overrideWidth,
            overrideHeight,
            diskCacheStrategy);
}
 

@Override
public void displayImage(Activity activity, String path, final GFImageView imageView, Drawable defaultDrawable, int width, int height) {
    Glide.with(activity)
            .load("file://" + path)
            .placeholder(defaultDrawable)
            .error(defaultDrawable)
            .override(width, height)
            .diskCacheStrategy(DiskCacheStrategy.NONE) //不缓存到SD卡
            .skipMemoryCache(true)
            //.centerCrop()
            .into(new ImageViewTarget<GlideDrawable>(imageView) {
                @Override
                protected void setResource(GlideDrawable resource) {
                    imageView.setImageDrawable(resource);
                }

                @Override
                public void setRequest(Request request) {
                    imageView.setTag(R.id.adapter_item_tag_key,request);
                }

                @Override
                public Request getRequest() {
                    return (Request) imageView.getTag(R.id.adapter_item_tag_key);
                }
            });
}
 

/**
 * {@inheritDoc}
 */
@Override
public void setRequest(Request request) {
    this.request = request;
}
 

/**
 * {@inheritDoc}
 */
@Override
public Request getRequest() {
    return request;
}
 

void addRequest(Request request) {
    requests.add(request);
}
 

/**
 * Stops tracking the given request.
 */
public void removeRequest(Request request) {
    requests.remove(request);
    pendingRequests.remove(request);
}
 

private Request buildRequest(Target<TranscodeType> target) {
    if (priority == null) {
        priority = Priority.NORMAL;
    }
    return buildRequestRecursive(target, null);
}
 

@Override
public Request getRequest() {
    return null;
}
 

@Override
public Request getRequest() {
    return request;
}
 

@Override
public void setRequest(Request request) {
    this.request = request;
    if (target != null) target.setRequest(request);
}
 

@Override
public void setRequest(@Nullable Request request) {}
 

@Nullable
@Override
public Request getRequest() {
    return null;
}
 

@Override public Request getRequest() {
    return target.getRequest();
}
 

@Override public void setRequest(Request request) {
    target.setRequest(request);
}
 

@Override
public Request getRequest() {
    return (Request) mView.getTag(mId);
}
 

@Override
public void setRequest(Request request) {
    mView.setTag(mId, request);
}
 

@Override
public void setRequest(@Nullable Request request) {
    this.request = request;
}
 

@Override
@Nullable
public Request getRequest() {
    return request;
}
 

@Override
public Request getRequest() {
    return request;
}
 

@Override
public void setRequest(Request request) {
    this.request = request;
}
 

@Override
public void setRequest(Request request) {
    setTag(request);
}
 

@Override public void setRequest(Request request) {
	view.setTag(request);
}
 

@Override public Request getRequest() {
	log("getRequest");
	return super.getRequest();
}