ImageLoader.java 文件源码

public ImageContainer get(String requestUrl, ImageListener imageListener, int maxWidth, int maxHeight, ScaleType scaleType) {
    throwIfNotOnMainThread();
    String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
    Bitmap cachedBitmap = this.mCache.getBitmap(cacheKey);
    if (cachedBitmap != null) {
        ImageContainer container = new ImageContainer(cachedBitmap, requestUrl, null, null);
        imageListener.onResponse(container, true);
        return container;
    }
    ImageContainer imageContainer = new ImageContainer(null, requestUrl, cacheKey, imageListener);
    imageListener.onResponse(imageContainer, true);
    BatchedImageRequest request = (BatchedImageRequest) this.mInFlightRequests.get(cacheKey);
    if (request != null) {
        request.addContainer(imageContainer);
        return imageContainer;
    }
    Request<Bitmap> newRequest = makeImageRequest(requestUrl, maxWidth, maxHeight, scaleType, cacheKey);
    this.mRequestQueue.add(newRequest);
    this.mInFlightRequests.put(cacheKey, new BatchedImageRequest(newRequest, imageContainer));
    return imageContainer;
}