How to use

getCacheKey

method

in

com.android.volley.toolbox.ImageLoader

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

final String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);

final String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);

final String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);

/**
 * 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.
 * @return True if the item exists in cache, false otherwise.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 * @return True if the item exists in cache, false otherwise.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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.
 */
public boolean isCached(String requestUrl, int maxWidth, int maxHeight, ScaleType scaleType) {
  throwIfNotOnMainThread();
  String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
  return mCache.getBitmap(cacheKey) != null;
}

/**
 * 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;
}

final String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);

final String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight, scaleType);

final String cacheKey = getCacheKey(requestUrl, maxWidth, maxHeight);