android应用客户端自动升级

# 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); 
#     } 
#  
# }