class ImageDownloaderTask extends AsyncTask

package com.ewallet.citygo.utils;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.http.AndroidHttpClient;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpGet;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.ref.WeakReference;

public class ImageDownloaderTask extends AsyncTask<String, Void, Bitmap> {
    private final WeakReference imageViewReference;
    String igstorepath;
    boolean isdownloaded=false;

    public ImageDownloaderTask(ImageView imageView,String igstorepath) {
        imageViewReference = new WeakReference(imageView);
        this.igstorepath=igstorepath;
    }

    private Bitmap downloadBitmap(String url) {
        File f = new File(igstorepath);
        if(f.exists() && !f.isDirectory()) { //Note that exists() will return true for directories, too
             isdownloaded=true;
            Log.d("ImageDownloaderTask 已存在:"+igstorepath,""+url);
            Bitmap bMap = BitmapFactory.decodeFile(igstorepath);
            return bMap;
         
        }else{
            isdownloaded=false;
            Log.d("ImageDownloaderTask 不存在 ",""+url);
            final AndroidHttpClient client = AndroidHttpClient.newInstance("Android");
            HttpGet getRequest = null;
            if(url!=null){
                   getRequest = new HttpGet(url);
            }else{
                Log.d("ImageDownloaderTask ","getRequest = new HttpGet(url)  null");
            }
        
            try {
                HttpResponse response = client.execute(getRequest);
                final int statusCode = response.getStatusLine().getStatusCode();
                if (statusCode != HttpStatus.SC_OK) {
                    Log.w("ImageDownloader", "Error " + statusCode
                            + " while retrieving bitmap from " + url);
                    return null;
                }

                final HttpEntity entity = response.getEntity();
                if (entity != null) {
                    InputStream inputStream = null;
                    try {
                        inputStream = entity.getContent();
                        final Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                      
                        return bitmap;
                    } finally {
                        if (inputStream != null) {
                            inputStream.close();
                        }
                        entity.consumeContent();
                    }
                }
            } catch (Exception e) {
                // Could provide a more explicit error message for IOException or
                // IllegalStateException
                getRequest.abort();
                Log.w("ImageDownloader", "Error while retrieving bitmap from " + url);
            } finally {
                if (client != null) {
                    client.close();
                }
            }
            return null;
          
      
        }
      
      
      

    }

    @Override
    // Actual download method, run in the task thread
    protected Bitmap doInBackground(String... params) {
        // params comes from the execute() call: params[0] is the url.
        return downloadBitmap(params[0]);
    }

    @Override
    // Once the image is downloaded, associates it to the imageView
    protected void onPostExecute(Bitmap bitmap) {
        if (isCancelled()) {
            bitmap = null;
        }
 

        if (imageViewReference != null) {
            ImageView imageView = (ImageView) imageViewReference.get();
            if (imageView != null) {

                if (bitmap != null) {
                    imageView.setImageBitmap(bitmap);
                  
                    if(isdownloaded){
                        //如果下載過的就不存
                      
                    }else{
                        File _file = new File(igstorepath);
                        OutputStream _outStream;
                        try {
                            _outStream = new FileOutputStream(_file);
                            bitmap.compress(Bitmap.CompressFormat.PNG, 90, _outStream);
                            try {
                                _outStream.flush();
                            } catch (IOException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                            try {
                                _outStream.close();
                            } catch (IOException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                        } catch (FileNotFoundException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                  

                } else {
                    //imageView.setImageDrawable(imageView.getContext().getResources().getDrawable(R.drawable.basketball));
                }
            }

        }
    }

}