自动更新版本

Android 应用自动更新代码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);     } }
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