Android Volley ImageLoader - BitmapLruCache 参数? [英] Android Volley ImageLoader - BitmapLruCache parameter?

问题描述

我在使用新的 Volley 库实现图像缓存时遇到了问题.在演示文稿中，代码如下所示

mRequestQueue = Volley.newRequestQueue(context);mImageLoader = new ImageLoader(mRequestQueue, new BitmapLruCache());

BitmapLruCache 显然没有包含在工具包中.知道如何实施它或向我指出一些资源吗?

http://www.youtube.com/watch?v=yhv8l9F44qo @14:38

谢谢！

解决方案

import android.graphics.Bitmap;导入 android.support.v4.util.LruCache;公共类 BitmapLruCache 扩展了 LruCache实现 ImageCache {公共静态 int getDefaultLruCacheSize() {最终 int maxMemory = (int) (Runtime.getRuntime().maxMemory()/1024);最终 int cacheSize = maxMemory/8;返回缓存大小；}公共 BitmapLruCache() {这(getDefaultLruCacheSize())；}公共 BitmapLruCache(int sizeInKiloBytes) {超级(sizeInKiloBytes)；}@覆盖protected int sizeOf(String key, Bitmap value) {返回 value.getRowBytes() * value.getHeight()/1024;}@覆盖公共位图 getBitmap(String url) {返回获取(网址)；}@覆盖public void putBitmap(String url, Bitmap bitmap) {放置(网址，位图)；}}

I am having trouble implementing Image cache using the new Volley library. In the presentation, code look like this

mRequestQueue = Volley.newRequestQueue(context);
mImageLoader = new ImageLoader(mRequestQueue, new BitmapLruCache());

The BitmapLruCache is obviously not included in the toolkit. Any idea how to implement it or point me to some resources?

http://www.youtube.com/watch?v=yhv8l9F44qo @14:38

Thanks!

解决方案

import android.graphics.Bitmap;
import android.support.v4.util.LruCache;

public class BitmapLruCache extends LruCache<String, Bitmap> implements ImageCache {
    public static int getDefaultLruCacheSize() {
        final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
        final int cacheSize = maxMemory / 8;

        return cacheSize;
    }

    public BitmapLruCache() {
        this(getDefaultLruCacheSize());
    }

    public BitmapLruCache(int sizeInKiloBytes) {
        super(sizeInKiloBytes);
    }

    @Override
    protected int sizeOf(String key, Bitmap value) {
        return value.getRowBytes() * value.getHeight() / 1024;
    }

    @Override
    public Bitmap getBitmap(String url) {
        return get(url);
    }

    @Override
    public void putBitmap(String url, Bitmap bitmap) {
        put(url, bitmap);
    }
}

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