Go语言视频零基础入门到精通

njjwheu

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);

}



}