缓存图像与LruCache

问题描述

我想使用LruCache在android系统缓存一些图像，但它不是缓存

这里是code

  INT cacheSize1 = 4 * 1024 * 1024; // 4MiB
    bitmapCache =新LruCache（cacheSize1）{
        保护INT整型尺寸（字符串键，位值）{
            返回value.getRowBytes（）* value.getHeight（）;    }};
 

在这里的其他方法

 公共无效addBitmapToMemoryCache（字符串键，位图位图）{
    如果（getBitmapFromMemCache（键）== NULL）{
        bitmapCache.put（键，位图）;
    }
}
    公共位图getBitmapFromMemCache（字符串键）{
    位图B =（位图）bitmapCache.get（密钥）;
    返回b;
}
 

在这里我使用它们，这是我的code

 的for（int i = 0; I＆LT; HomeActivity.globalObj.categoriesList.size（）;我++）{
            ImageView的IV =新ImageView的（getApplicationContext（））;
            位图BB = getBitmapFromMemCache（HomeActivity.globalObj.categoriesList.get（I）。名称）;
            如果（BB！= NULL）{
                iv.setImageBitmap（BB）;
                imageViewList.add（四）;
            }
            其他{
            位图B = getImageBitmap（HomeActivity.globalObj.categoriesList.get㈠.large_image）;
            addBitmapToMemoryCache（HomeActivity.globalObj.categoriesList.get（我）.name和B）;
            iv.setImageBitmap（二）;
            imageViewList.add（四）;            }        }
 

解决方案

转寄此，这是一个谷歌I / O示例项目讲解了​​如何使用 LRU缓存。

I am trying to use LruCache in android to cache some images, but its not caching

here is the code

   int cacheSize1 = 4 * 1024 * 1024; // 4MiB
    bitmapCache = new LruCache(cacheSize1) {
        protected int sizeOf(String key, Bitmap value) {
            return value.getRowBytes() * value.getHeight();

    }};

here its other methods

    public void addBitmapToMemoryCache(String key, Bitmap bitmap) {
    if (getBitmapFromMemCache(key) == null) {
        bitmapCache.put(key, bitmap);
    }
}
    public Bitmap getBitmapFromMemCache(String key) {
    Bitmap b = (Bitmap)bitmapCache.get(key);
    return b;
}

here I am using them this is my code

for (int i = 0; i < HomeActivity.globalObj.categoriesList.size(); i++) {
            ImageView iv = new ImageView(getApplicationContext());
            Bitmap bb = getBitmapFromMemCache(HomeActivity.globalObj.categoriesList.get(i).name);
            if (bb != null) {
                iv.setImageBitmap(bb);
                imageViewList.add(iv);
            }
            else{
            Bitmap b = getImageBitmap(HomeActivity.globalObj.categoriesList.get(i).large_image);
            addBitmapToMemoryCache(HomeActivity.globalObj.categoriesList.get(i).name, b);
            iv.setImageBitmap(b);
            imageViewList.add(iv);

            }

        }

解决方案

Refer this project, it's a Google I/O sample project to explain how to use LRU Cache.

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