【进阶android】Volley源码分析——Volley的工具【ImageLoader】_安卓 volleyutil.getinstance().sendimageloader

public ImageContainer get(String requestUrl, ImageListener imageListener,int maxWidth, int maxHeight) 

protected void deliverResponse(Bitmap response) {
        mListener.onResponse(response);
    }

public ImageContainer get(String requestUrl, ImageListener imageListener,
            int maxWidth, int maxHeight) {
        ......
 
        // The request is not already in flight. Send the new request to the network and
        // track it.
        Request<?> newRequest =
            new ImageRequest(requestUrl, new Listener<Bitmap>() {
                @Override
                public void onResponse(Bitmap response) {
                    onGetImageSuccess(cacheKey, response);//成功获取图片之后，回调的方法
                }
            }, maxWidth, maxHeight,
            Config.RGB_565, new ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    onGetImageError(cacheKey, error);//获取图片失败后，回调的方法
                }
            });
 
        ......
    }

private void batchResponse(String cacheKey, BatchedImageRequest request) {
        mBatchedResponses.put(cacheKey, request);//将本次Request请求添加到批量请求集合之中
        // If we don't already have a batch delivery runnable in flight, make a new one.
        // Note that this will be used to deliver responses to all callers in mBatchedResponses.
        //如果我们还没有一个用来处理批量请求的回调方法，创建一个。
        //注意此回调方法将用来处理响应请求中每一个请求。
        if (mRunnable == null) {
            mRunnable = new Runnable() {
                @Override
                public void run() {
                    for (BatchedImageRequest bir : mBatchedResponses.values()) {
                        for (ImageContainer container : bir.mContainers) {//处理一个请求所有的兴趣点
                            // If one of the callers in the batched request canceled the request
                            // after the response was received but before it was delivered,
                            // skip them.
                            if (container.mListener == null) {
                                continue;
                            }
                            if (bir.getError() == null) {
                                container.mBitmap = bir.mResponseBitmap;
                                container.mListener.onResponse(container, false);//回调兴趣点的方法！
                            }......
                        }
                    }
                    mBatchedResponses.clear();//同批次的请求皆被处理，清空
                    mRunnable = null;//开始一场新的批量处理任务
                }
 
            };
            // Post the runnable.
            //创建消息后mBatchResponseDelayMs毫秒后，再执行消息
            //mBatchResponseDelay时间内，添加到mBatchedResponses之中的所有Request对象，视为同批次的请求。
            mHandler.postDelayed(mRunnable, mBatchResponseDelayMs);
        }
    }

三 总结

当然由于本人自身水平所限，文章肯定有一些不对的地方，希望大家指出！

愿大家一起进步，谢谢！