package?com.example.asynctask;

import?java.io.BufferedInputStream;
import?java.io.IOException;
import?java.net.MalformedURLException;
import?java.net.URL;
import?java.util.HashMap;
import?java.util.Map;

import?android.graphics.Bitmap;
import?android.graphics.BitmapFactory;
import?android.os.AsyncTask;
import?android.os.Handler;
import?android.os.Message;
import?android.support.v4.util.LruCache;
import?android.util.Log;
import?android.widget.ImageView;

public?class?LoadImgUrl?{

????private?ImageView?itemImg;
????private?String?imgUrl;
????private?LruCache<String,?Bitmap>?mImgCache;
????private?Map<String,?Thread>?threadMap?=?new?HashMap<String,?Thread>();
????private?Handler?mHandler?=?new?Handler(){
????????public?void?handleMessage(Message?msg)?{
????????????if(itemImg.getTag()!=?null?&&?itemImg.getTag().equals(imgUrl)){
????????????????ImageView?threadImg?=?((ItemBean)msg.obj).msgImg;
????????????????Bitmap?bitMap?=?((ItemBean)msg.obj).bitMap;
????????????????threadImg.setImageBitmap(bitMap);
????????????}
????????};
????};
????public?LoadImgUrl()?{
????????//?TODO?Auto-generated?constructor?stub
????????int?maxMemory?=?(int)?Runtime.getRuntime().maxMemory()?/?4;
????????mImgCache?=?new?LruCache<String,?Bitmap>(maxMemory);
????}
????public?void?setImgUrl(ImageView?img,final?String?url,int?imgHolder)?{
????????this.itemImg?=?img;
????????this.imgUrl?=?url;
????????if?(img.getTag()?==?null?||?!img.getTag().equals(url))?{
????????????img.setBackgroundResource(imgHolder);
????????????img.setTag(url);
????????}
????????Bitmap?imgBitmap?=?getBitMapByLruc(url);
????????if?(imgBitmap?==?null)?{
//????????????setBitmapByAsyncTask(url,?img);
????????????Thread?imgThread?=?threadMap.get(url);
????????????if?(imgThread?==?null)?{
????????????????setBitmapByNewThread(url,img);
????????????}
????????}else?{
????????????img.setImageBitmap(imgBitmap);
????????}
????}
????
????private?void?setBitmapByNewThread(final?String?url,final?ImageView?threadImg)?{
????????Thread?newThread?=?new?Thread(){
????????????@Override
????????????public?void?run()?{
????????????????//?TODO?Auto-generated?method?stub
????????????????super.run();
????????????????BufferedInputStream?is?=?null;
????????????????try?{
????????????????????is?=?new?BufferedInputStream(new?URL(url).openStream());
????????????????????Thread.sleep(3000);
????????????????}?catch?(MalformedURLException?e)?{
????????????????????//?TODO?Auto-generated?catch?block
????????????????????e.printStackTrace();
????????????????}?catch?(IOException?e)?{
????????????????????//?TODO?Auto-generated?catch?block
????????????????????e.printStackTrace();
????????????????}?catch?(InterruptedException?e)?{
????????????????????//?TODO?Auto-generated?catch?block
????????????????????e.printStackTrace();
????????????????}
????????????????Bitmap?bitMap?=?BitmapFactory.decodeStream(is);
????????????????putBitmapToLruc(bitMap,?url);
????????????????Message?msg?=?Message.obtain();
????????????????ItemBean?itemBean?=?new?ItemBean(threadImg,?bitMap);
????????????????msg.obj?=?itemBean;
????????????????mHandler.sendMessage(msg);
????????????}
????????};
????????newThread.start();
????????threadMap.put(url,?newThread);
????}

????private?void?setBitmapByAsyncTask(String?url,ImageView?imgView)?{
????????new?MyImgAsyncTask(url,?imgView).execute();
????}
????
????private?Bitmap?getBitMapByLruc(String?url)?{
????????return?mImgCache.get(url);
????}
????
????private?void?putBitmapToLruc(Bitmap?bitMap,String?url)?{
????????mImgCache.put(url,?bitMap);
????}

????class?MyImgAsyncTask?extends?AsyncTask<String,?Progress,?Bitmap>{
????????ImageView?asItemImg;
????????String?imgUrl;
????????public?MyImgAsyncTask(String?url,ImageView?imgView)?{
????????????//?TODO?Auto-generated?constructor?stub
????????????asItemImg?=?imgView;
????????????imgUrl?=?url;
????????}
????????@Override
????????protected?Bitmap?doInBackground(String...?params)?{
????????????//?TODO?Auto-generated?method?stub
????????????Bitmap?bitMap?=?null;
????????????try?{
????????????????BufferedInputStream?bfIs?=?new?BufferedInputStream(new?URL(imgUrl).openStream());
????????????????bitMap?=?BitmapFactory.decodeStream(bfIs);
????????????????putBitmapToLruc(bitMap,?imgUrl);
????????????}?catch?(MalformedURLException?e)?{
????????????????//?TODO?Auto-generated?catch?block
????????????????e.printStackTrace();
????????????}?catch?(IOException?e)?{
????????????????//?TODO?Auto-generated?catch?block
????????????????e.printStackTrace();
????????????}
????????????return?bitMap;
????????}
????????
????????@Override
????????protected?void?onPostExecute(Bitmap?result)?{
????????????//?TODO?Auto-generated?method?stub
????????????super.onPostExecute(result);
????????????asItemImg.setImageBitmap(result);
????????}
????}
????
????class?ItemBean{
????????ImageView?msgImg;
????????Bitmap?bitMap;
????????public?ItemBean(ImageView?img,Bitmap?bitmap)?{
????????????//?TODO?Auto-generated?constructor?stub
????????????msgImg?=?img;
????????????this.bitMap?=?bitmap;
????????}
????}
}