package com.example.testdemo;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import org.apache.http.HttpResponse;

 import org.apache.http.client.HttpClient;

 import org.apache.http.client.methods.HttpGet;

 import org.apache.http.impl.client.DefaultHttpClient;

 import android.os.AsyncTask;

 import android.os.Bundle;

 import android.app.Activity;

 import android.app.ProgressDialog;

 import android.graphics.Bitmap;

 import android.graphics.BitmapFactory;

 import android.view.Menu;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 import android.widget.ImageView;

 public class MainActivity extends Activity {

     private  Button btn;

     private ImageView mg;

     private ProgressDialog pDialog;

     private String path="http://himg2.huanqiu.com/attachment2010/111207/zip1323221781/1323221781_6.jpg";

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         btn=(Button)findViewById(R.id.button1);

         mg=(ImageView)findViewById(R.id.imageView1);

         pDialog=new ProgressDialog(this);

         pDialog.setTitle("提示");

         pDialog.setCancelable(false);

         pDialog.setMessage("正在下载，请稍后……");

         pDialog.setIcon(R.drawable.ic_launcher);

         pDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

         btn.setOnClickListener(new OnClickListener() {

             @Override

             public void onClick(View v) {

                 // TODO Auto-generated method stub

                 new MyTask().execute(path);

             }

         });

     }

     @Override

     public boolean onCreateOptionsMenu(Menu menu) {

         // Inflate the menu; this adds items to the action bar if it is present.

         getMenuInflater().inflate(R.menu.activity_main, menu);

         return true;

     }

     public class MyTask extends AsyncTask<String, Integer, Bitmap>

     {

         /* (non-Javadoc)

          * @see android.os.AsyncTask#doInBackground(Params[])

          */

         @Override

         protected Bitmap doInBackground(String... params) {

             // TODO Auto-generated method stub

             Bitmap bitmap=null;

             ByteArrayOutputStream outputStream=new ByteArrayOutputStream();

             InputStream inputStream=null;

             try {

                 HttpClient httpClient=new DefaultHttpClient();

                 HttpGet httpGet=new HttpGet(params[0]);

                 HttpResponse httpResponse=httpClient.execute(httpGet);

                 if (httpResponse.getStatusLine().getStatusCode()==200) {

                     inputStream=httpResponse.getEntity().getContent();

                     long file_length=httpResponse.getEntity().getContentLength();

                     byte[] data=new byte[1024];

                     int len=0;

                     int total=0;

                     while ((len = inputStream.read(data)) != -1) {

                         total+=len;

                         int values=(int)((total/(float)file_length)*100);

                         publishProgress(values);

                         outputStream.write(data, 0, len);

                     }

                     byte[] result01=outputStream.toByteArray();

                     bitmap=BitmapFactory.decodeByteArray(result01, 0, result01.length);

                 }

             } catch (Exception e) {

                 // TODO: handle exception

                 e.printStackTrace();

             }finally{

                 if (inputStream != null) {

                     try {

                         inputStream.close();

                     } 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);

             pDialog.dismiss();

             mg.setImageBitmap(result);

         }

         @Override

         protected void onPreExecute() {

             // TODO Auto-generated method stub

             super.onPreExecute();

             pDialog.show();

         }

         @Override

         protected void onProgressUpdate(Integer... values) {

             // TODO Auto-generated method stub

             super.onProgressUpdate(values);

             pDialog.setProgress(values[0]);

         }

     }

 }