How to use

ImageLoader$ImageCache

in

com.android.volley.toolbox

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

/**
 * Handler for when an image was successfully loaded.
 * @param cacheKey The cache key that is associated with the image request.
 * @param response The bitmap that was returned from the network.
 */
protected void onGetImageSuccess(String cacheKey, Bitmap response) {
  // cache the image that was fetched.
  mCache.putBitmap(cacheKey, response);
  // remove the request from the list of in-flight requests.
  BatchedImageRequest request = mInFlightRequests.remove(cacheKey);
  if (request != null) {
    // Update the response bitmap.
    request.mResponseBitmap = response;
    // Send the batched response
    batchResponse(cacheKey, request);
  }
}

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

Bitmap cachedBitmap = mCache.getBitmap(cacheKey);
if (cachedBitmap != null) {

mCache.putBitmap(cacheKey, response);

/**
 * Checks if the item is available in the cache.
 *
 * @param requestUrl The url of the remote image
 * @param maxWidth The maximum width of the returned image.
 * @param maxHeight The maximum height of the returned image.
 * @param scaleType The scaleType of the imageView.
 * @return True if the item exists in cache, false otherwise.
 */
/*
 * 检查 图片数据 是否被缓存
 * 根据四个数据匹配图片：
 * 1. requestUrl：该图片的 url
 * 2. maxWidth：该图片的 最大宽度
 * 3. maxHeight：该图片的 最大高度
 * 4. scaleType：该图片的 ImageView.ScaleType（ CENTER_CROP, FIT_XY ... ）
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  // 检查是否为 主 UI 线程
  throwIfNotOnMainThread();
  // 根据数据，获取 cacheKey
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  /*
   * 从 外部提供的 ImageCache 实现类中
   * 去查找该 url 对应的 Bitmap 缓存
   */
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * Handler for when an image was successfully loaded.
 * @param cacheKey The cache key that is associated with the image request.
 * @param response The bitmap that was returned from the network.
 * �ɹ���ȡͼƬ����
 */
private void onGetImageSuccess(String cacheKey, Bitmap response) {
  // cache the image that was fetched.
  //����ͼƬ
  mCache.putBitmap(cacheKey, response);
  // ������ɣ�����Ҫ���
  // remove the request from the list of in-flight requests.
  BatchedImageRequest request = mInFlightRequests.remove(cacheKey);
  if (request != null) {
    // Update the response bitmap.
    request.mResponseBitmap = response;
    // Send the batched response
    //������
    batchResponse(cacheKey, request);
  }
}

/**
 * Handler for when an image was successfully loaded.
 * @param cacheKey The cache key that is associated with the image request.
 * @param response The bitmap that was returned from the network.
 */
protected void onGetImageSuccess(String cacheKey, Bitmap response) {
  // cache the image that was fetched.
  mCache.putBitmap(cacheKey, response);
  // remove the request from the list of in-flight requests.
  BatchedImageRequest request = mInFlightRequests.remove(cacheKey);
  if (request != null) {
    // Update the response bitmap.
    request.mResponseBitmap = response;
    // Send the batched response
    batchResponse(cacheKey, request);
  }
}

/**
 * Handler for when an image was successfully loaded.
 * @param cacheKey The cache key that is associated with the image request.
 * @param response The bitmap that was returned from the network.
 */
protected void onGetImageSuccess(String cacheKey, Bitmap response) {
  // cache the image that was fetched.
  mCache.putBitmap(cacheKey, response);
  // remove the request from the list of in-flight requests.
  BatchedImageRequest request = mInFlightRequests.remove(cacheKey);
  if (request != null) {
    // Update the response bitmap.
    request.mResponseBitmap = response;
    // Send the batched response
    batchResponse(cacheKey, request);
  }
}

/**
 * Handler for when an image was successfully loaded.
 * @param cacheKey The cache key that is associated with the image request.
 * @param response The bitmap that was returned from the network.
 */
protected void onGetImageSuccess(String cacheKey, Bitmap response) {
  // cache the image that was fetched.
  mCache.putBitmap(cacheKey, response);
  // remove the request from the list of in-flight requests.
  BatchedImageRequest request = mInFlightRequests.remove(cacheKey);
  if (request != null) {
    // Update the response bitmap.
    request.mResponseBitmap = response;
    // Send the batched response
    batchResponse(cacheKey, request);
  }
}

/**
 * Handler for when an image was successfully loaded.
 * @param cacheKey The cache key that is associated with the image request.
 * @param response The bitmap that was returned from the network.
 */
protected void onGetImageSuccess(String cacheKey, Bitmap response) {
  // cache the image that was fetched.
  mCache.putBitmap(cacheKey, response);
  // remove the request from the list of in-flight requests.
  BatchedImageRequest request = mInFlightRequests.remove(cacheKey);
  if (request != null) {
    // Update the response bitmap.
    request.mResponseBitmap = response;
    // Send the batched response
    batchResponse(cacheKey, request);
  }
}