ANdroid跟新客户端

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import java.io.File;    

   

import java.io.FileOutputStream;  

   

import java.io.IOException;    

   

import java.io.InputStream;    

  

import org.apache.http.HttpEntity;    

import org.apache.http.HttpResponse;    

import org.apache.http.client.ClientProtocolException;    

import org.apache.http.client.HttpClient;    

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

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

      

import android.app.AlertDialog;    

import android.app.Dialog;    

import android.app.ProgressDialog;    

import android.content.DialogInterface;    

import android.content.Intent;    

import android.net.Uri;    

import android.os.Bundle;    

import android.os.Environment;    

import android.os.Handler;    

      

public class Update extends BaseActivity {    

   public ProgressDialog pBar;    

   private Handler handler = new Handler();    

    

    @Override    

    protected void onCreate(Bundle savedInstanceState) {    

        super.onCreate(savedInstanceState);    

        setContentView(R.layout.update);    

        Dialog dialog = new AlertDialog.Builder(Update.this).setTitle("系统更新")    

                .setMessage("发现新版本，请更新！")// 设置内容    

                .setPositiveButton("确定",// 设置确定按钮    

                        new DialogInterface.OnClickListener() {    

    

                            @Override    

                            public void onClick(DialogInterface dialog,    

                                    int which) {    

                               pBar = new ProgressDialog(Update.this);    

                               pBar.setTitle("正在下载");    

                                pBar.setMessage("请稍候...");    

                                pBar    

                                        .setProgressStyle(ProgressDialog.STYLE_SPINNER);    

                               downFile("http://url:8765/OA.apk");     

                                       

                            }    

    

                       }).setNegativeButton("取消",      

                        new DialogInterface.OnClickListener() {    

                           public void onClick(DialogInterface dialog,    

                                    int whichButton) {    

                                // 点击"取消"按钮之后退出程序    

                                     

                            }    

                        }).create();// 创建    

        // 显示对话框    

        dialog.show();    

      

    }    

      

    void downFile(final String url) {    

        pBar.show();    

        new Thread() {    

            public void run() {    

                HttpClient client = new DefaultHttpClient();    

                // params[0]代表连接的url    

                HttpGet get = new HttpGet(url);    

                HttpResponse response;    

                try {    

                  response = client.execute(get);    

                    HttpEntity entity = response.getEntity();    

                   long length = entity.getContentLength();    

                   InputStream is = entity.getContent();    

                   FileOutputStream fileOutputStream = null;    

                   if (is != null) {    

      

                      File file = new File(Environment    

                              .getExternalStorageDirectory(), "OA.apk");    

                       fileOutputStream = new FileOutputStream(file);    

                             

                        byte[] buf = new byte[1024];    

                      int ch = -1;    

                      int count = 0;    

                       while ((ch = is.read(buf)) != -1) {    

                          // baos.write(buf, 0, ch);    

                           fileOutputStream.write(buf, 0, ch);    

                           count += ch;    

                           if (length > 0) {    

                               

                          }    

   

                    }    

     

                  }    

                  fileOutputStream.flush();    

                   if (fileOutputStream != null) {    

                       fileOutputStream.close();    

                 }    

                   down();    

                } catch (ClientProtocolException e) {    

                    // TODO Auto-generated catch block    

                  e.printStackTrace();    

               } catch (IOException e) {    

                   // TODO Auto-generated catch block    

                    e.printStackTrace();    

                }    

            }    

     

       }.start();    

     

   }    

      

   void down() {    

      handler.post(new Runnable() {    

         public void run() {    

               pBar.cancel();    

  update();    

}    

});         

    }    

      

   void update() {    

     

        Intent intent = new Intent(Intent.ACTION_VIEW);    

        intent.setDataAndType(Uri.fromFile(new File("/sdcard/OA.apk")),    

                "application/vnd.android.package-archive");   

        startActivity(intent);    

    }       

}