cancelPotentialWork.java

/**
 * 如果当前存在一致的任务，返回false，代表不需要新建任务，否则返回true
 */
public static boolean cancelPotentialWork(Object data, ImageView imageView) {
    final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);

    if (bitmapWorkerTask != null) {
        final Object bitmapData = bitmapWorkerTask.data;
        if (bitmapData == null || !bitmapData.equals(data)) {
            bitmapWorkerTask.cancel(true);
            if (BuildConfig.DEBUG) {
                Log.d(TAG, "cancelPotentialWork - cancelled work for " + data);
            }
        } else {
            // The same work is already in progress.
            return false;
        }
    }
    return true;
}