Android Open Source - smartnavi Web Image Cache

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Back to project page smartnavi.

License

The source code is released under:

Apache License

Java Source Code

package org.osmdroid.bonuspack.utils;
//w ww .ja  va 2s . c o  m
import android.graphics.Bitmap;
import android.util.Log;

import java.util.LinkedHashMap;

/**
 * Simple memory cache for handling images loaded from the web.
 * The url is the key.
 *
 * @author M.Kergall
 */
public class WebImageCache {
    LinkedHashMap<String, Bitmap> mCacheMap;
    int mCapacity;

    public WebImageCache(int maxItems) {
        mCapacity = maxItems;
        mCacheMap = new LinkedHashMap<String, Bitmap>(maxItems + 1, 1.1f, true) {
            private static final long serialVersionUID = -4831331496601290979L;

            protected boolean removeEldestEntry(Entry<String, Bitmap> eldest) {
                return size() > mCapacity;
            }
        };
    }

    private void putInCache(String url, Bitmap image) {
        synchronized (mCacheMap) {
            mCacheMap.put(url, image);
        }
        //Log.d(BonusPackHelper.LOG_TAG, "WebImageCache:updateCache size="+mCacheMap.size());
    }

    /**
     * get the image, either from the cache, or from the web if not in the cache.
     * Can be called by multiple threads.
     * If 2 threads ask for the same url simultaneously, this could put the image twice in the cache.
     * => TODO, have a "queue" of current requests.
     *
     * @param url of the image
     * @return the image, or null if any failure.
     */
    public Bitmap get(String url) {
        Bitmap image;
        synchronized (mCacheMap) {
            image = mCacheMap.get(url);
        }
        if (image == null) {
            Log.d(BonusPackHelper.LOG_TAG, "WebImageCache:load :" + url);
            image = BonusPackHelper.loadBitmap(url);
            if (image != null) {
                putInCache(url, image);
            }
        }
        return image;
    }

}

Java Source Code List

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