getBitmapFromMemCache(String) 方法未定义答案

【问题标题】：The method getBitmapFromMemCache(String) is undefinedgetBitmapFromMemCache(String) 方法未定义
【发布时间】：2014-05-08 13:34:07
【问题描述】：

我正在学习 http://developer.android.com/training/displaying-bitmaps/cache-bitmap.html 的教程，但我在任何地方都找不到 getBitmapFromMemCache(String) 方法！！

在什么课上可以找到？

【问题讨论】：

标签： android bitmap

【解决方案1】：

这是他们实现的自定义方法。只需查看您链接的页面上的第一个列表：

private LruCache<String, Bitmap> mMemoryCache;

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    // Get max available VM memory, exceeding this amount will throw an
    // OutOfMemory exception. Stored in kilobytes as LruCache takes an
    // int in its constructor.
    final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

    // Use 1/8th of the available memory for this memory cache.
    final int cacheSize = maxMemory / 8;

    mMemoryCache = new LruCache<String, Bitmap>(cacheSize) {
        @Override
        protected int sizeOf(String key, Bitmap bitmap) {
            // The cache size will be measured in kilobytes rather than
            // number of items.
            return bitmap.getByteCount() / 1024;
        }
    };
    ...
}

public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
    if (getBitmapFromMemCache(key) == null) {
        mMemoryCache.put(key, bitmap);
    }
}

public Bitmap getBitmapFromMemCache(String key) {
    return mMemoryCache.get(key);
}

【讨论】：