Android Open Source - GreenDroid Image Cache

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2010 Cyril Mottier (http://www.cyrilmottier.com)
 */*w  w  w .ja v  a  2s.c o  m*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package greendroid.image;

import greendroid.app.GDApplication.OnLowMemoryListener;
import greendroid.util.GDUtils;

import java.lang.ref.SoftReference;
import java.util.HashMap;

import android.content.Context;
import android.graphics.Bitmap;

/**
 * A very basing implementation of an Bitmap cache
 * 
 * @author Cyril Mottier
 */
public class ImageCache implements OnLowMemoryListener {

    private final HashMap<String, SoftReference<Bitmap>> mSoftCache;

    public ImageCache(Context context) {
        mSoftCache = new HashMap<String, SoftReference<Bitmap>>();
        GDUtils.getGDApplication(context).registerOnLowMemoryListener(this);
    }

    public static ImageCache from(Context context) {
        return GDUtils.getImageCache(context);
    }

    public Bitmap get(String url) {
        final SoftReference<Bitmap> ref = mSoftCache.get(url);
        if (ref == null) {
            return null;
        }

        final Bitmap bitmap = ref.get();
        if (bitmap == null) {
            mSoftCache.remove(url);
        }

        return bitmap;
    }

    public void put(String url, Bitmap bitmap) {
        mSoftCache.put(url, new SoftReference<Bitmap>(bitmap));
    }

    public void flush() {
        mSoftCache.clear();
    }

    public void onLowMemoryReceived() {
        flush();
    }
}

Java Source Code List

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