Android Open Source - unmp Memory Cache

From Project

Back to project page unmp.

License

The source code is released under:

MIT License

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Java Source Code

package com.parnswir.unmp.core;
/*ww w .  ja v a 2 s  .c  om*/
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import android.graphics.Bitmap;
import android.util.Log;

public class MemoryCache {

    private static final String TAG = "MemoryCache";
    private Map<String, Bitmap> cache = Collections.synchronizedMap(new LinkedHashMap<String, Bitmap>(10, 1.5f, true));
    private long size = 0;
    private long limit = 1000000;

    public MemoryCache(){
        setLimit(Runtime.getRuntime().maxMemory() / 4);
    }
    
    public void setLimit(long new_limit){
        limit=new_limit;
        Log.i(TAG, "MemoryCache will use up to " + limit / 1024.0 / 1024.0 + "MB");
    }

    public Bitmap get(String i){
        try{
            if(!cache.containsKey(i))
                return null;
            return cache.get(i);
        }catch(NullPointerException ex){
            ex.printStackTrace();
            return null;
        }
    }

    public void put(String position, Bitmap bitmap){
        try{
            if(cache.containsKey(position))
                size -= getSizeInBytes(cache.get(position));
            cache.put(position, bitmap);
            size += getSizeInBytes(bitmap);
            checkSize();
        }catch(Throwable th){
            th.printStackTrace();
        }
    }
    
    private void checkSize() {
        if(size > limit){
            Iterator<Entry<String, Bitmap>> iter = cache.entrySet().iterator();
            while(iter.hasNext()){
                Entry<String, Bitmap> entry = iter.next();
                size -= getSizeInBytes(entry.getValue());
                iter.remove();
                if(size <= limit)
                    break;
            }
            Log.i(TAG, "Cleaned cache. New size " + cache.size());
        }
    }

    public void clear() {
        try{
            cache.clear();
            size = 0;
        }catch(NullPointerException ex){
            ex.printStackTrace();
        }
    }

    long getSizeInBytes(Bitmap bitmap) {
        if(bitmap == null)
            return 0;
        return bitmap.getRowBytes() * bitmap.getHeight();
    }
}

Java Source Code List