package com.example.imoc.Adapter;

import java.io.BufferedInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import android.annotation.SuppressLint;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.AsyncTask;

import android.support.v4.util.LruCache;

import android.widget.ImageView;

@SuppressLint("NewApi")

public class HttpAsyncTask {

// 緩存

private LruCache<String, Bitmap> mCache;

public HttpAsyncTask() {

int maxMeory = (int) Runtime.getRuntime().maxMemory();

int cacheSize = maxMeory / 4;

mCache = new LruCache<String, Bitmap>(cacheSize) {

@Override

protected int sizeOf(String key, Bitmap value) {

return value.getByteCount();

}

};

}

public void addBitmap2Cache(String url, Bitmap bitmap) {

if (getBitmap4Cache(url) == null) {

mCache.put(url, bitmap);

}

}

public Bitmap getBitmap4Cache(String url) {

return mCache.get(url);

}

public void showImageByAsync(ImageView imageView, String url) {

Bitmap bitmap = getBitmap4Cache(url);

if (bitmap == null) {

new NewsAsyncTask(imageView, url).execute(url);

} else {

imageView.setImageBitmap(bitmap);

}

// new NewsAsyncTask(imageView,url).execute(url);

}

public Bitmap getBitmapFromUrl(String sturl) {

Bitmap bitmap = null;

InputStream inputStream = null;

try {

URL url = new URL(sturl);

HttpURLConnection connection = (HttpURLConnection) url

.openConnection();

inputStream = new BufferedInputStream(connection.getInputStream());

bitmap = BitmapFactory.decodeStream(inputStream);

connection.connect();

return bitmap;

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

if (inputStream != null) {

try {

inputStream.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

return null;

}

private class NewsAsyncTask extends AsyncTask<String, Void, Bitmap> {

private ImageView mimageView;

private String mUrl;

public NewsAsyncTask(ImageView imageView, String url) {

mimageView = imageView;

mUrl = url;

}

@Override

protected Bitmap doInBackground(String... params) {

// TODO Auto-generated method stub

String url = params[0];

Bitmap bitmap = getBitmap4Cache(url);

if (bitmap != null) {

addBitmap2Cache(url, bitmap);

}

return bitmap;

// return getBitmapFromUrl(params[0]);

}

@Override

protected void onPostExecute(Bitmap result) {

// TODO Auto-generated method stub

super.onPostExecute(result);

if (mimageView.getTag().equals(mUrl)) {

mimageView.setImageBitmap(result);

}

}

}

}

adapter 中也設置了