Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- package com.samir;
- 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));//Last argument true for LRU ordering
- private long size=0;//current allocated size
- private long limit=1000000;//max memory in bytes
- public MemoryCache(){
- //use 25% of available heap size
- setLimit(Runtime.getRuntime().maxMemory()/4);
- }
- public void setLimit(long new_limit){
- limit=new_limit;
- Log.i(TAG, "MemoryCache will use up to "+limit/1024./1024.+"MB");
- }
- public Bitmap get(String id){
- try{
- if(!cache.containsKey(id))
- return null;
- //NullPointerException sometimes happen here http://code.google.com/p/osmdroid/issues/detail?id=78
- return cache.get(id);
- }catch(NullPointerException ex){
- ex.printStackTrace();
- return null;
- }
- }
- public void put(String id, Bitmap bitmap){
- try{
- if(cache.containsKey(id))
- size-=getSizeInBytes(cache.get(id));
- cache.put(id, bitmap);
- size+=getSizeInBytes(bitmap);
- checkSize();
- }catch(Throwable th){
- th.printStackTrace();
- }
- }
- private void checkSize() {
- Log.i(TAG, "cache size="+size+" length="+cache.size());
- if(size>limit){
- Iterator<Entry<String, Bitmap>> iter=cache.entrySet().iterator();//least recently accessed item will be the first one iterated
- while(iter.hasNext()){
- Entry<String, Bitmap> entry=iter.next();
- size-=getSizeInBytes(entry.getValue());
- iter.remove();
- if(size<=limit)
- break;
- }
- Log.i(TAG, "Clean cache. New size "+cache.size());
- }
- }
- public void clear() {
- try{
- //NullPointerException sometimes happen here http://code.google.com/p/osmdroid/issues/detail?id=78
- cache.clear();
- size=0;
- }catch(NullPointerException ex){
- ex.printStackTrace();
- }
- }
- long getSizeInBytes(Bitmap bitmap) {
- if(bitmap==null)
- return 0;
- return bitmap.getRowBytes() * bitmap.getHeight();
- }
- }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement