android 新版本下载安装

最新推荐文章于 2025-06-04 14:09:41 发布

原创最新推荐文章于 2025-06-04 14:09:41 发布 · 960 阅读

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#android #exception #download #url #list #string

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本文详细介绍了应用程序如何实现自动检查并下载新版本的过程。通过服务器返回版本信息，并与当前版本号进行对比，若存在更新，则下载新版本并完成安装。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1 首先在程序启动的时候向服务器发送请求服务器会返回 String newVerString="2|app.quannaojiaoyu.com......"

2 然后根据 “|”拆分为俩个list 元素   取第一个list 元素和当前的版本号进行比较如果此元素大于版本号则发现新版本开始下载 url 为list的第二个元素下载完毕即可安装
   String newVerString = functions.getHttpResponse(
     urlApi + "base.asp", "getVer");
   System.out.println("newString--->"+newVerString);
   Log.d("StartPage", "Check Server.");
   if (newVerString != null)
   {
    ArrayList<String> listVerStrings = functions.splitString(newVerString);
         //得到当前版本号

    int curVersion = functions.getAppVersionName(getApplicationContext());


    Log.d("StartPage", listVerStrings.get(0));
    // Check New Version
    if (curVersion < Integer.parseInt(listVerStrings.get(0)))
    {
     Log.d("StartPage", "find new version.");

     try
     {

      URL Url = new URL(listVerStrings.get(1));
      URLConnection conn = Url.openConnection();
      conn.connect();
      InputStream is = conn.getInputStream();
      int fileSize = conn.getContentLength();//获取文件长度

Log.d("StartPage", "new version download start ("
+ String.valueOf(fileSize) + ")...");

      msg = new Message();
      msg.what = UPDATE_NEWVER;
      msg.arg1 = fileSize;
      handler.sendMessage(msg);

      if (fileSize <= 0)return;
      FileOutputStream FOS = new FileOutputStream(strSDPath
        + "/cawords.apk");
      byte buf[] = new byte[1024];
      int downLoadFilePosition = 0;
      int numread;
      while ((numread = is.read(buf)) != -1)
      {
       FOS.write(buf, 0, numread);
       downLoadFilePosition += numread;
       Log.d("StartPage", "new version downloading ("
         + String.valueOf(downLoadFilePosition)
         + ")...");

       msg = new Message();
       msg.what = UPDATE_DOWNLOAD;
       msg.arg1 = downLoadFilePosition;
       handler.sendMessage(msg);
      }

Log.d("StartPage", "New Version Downloaded.");

      Intent intent = new Intent();
      // 安装程序
      intent.setDataAndType(
        Uri.fromFile(new File(strSDPath
          + "/com.quannaojiaoyu.cadict.apk")),
        "application/vnd.android.package-archive");
      startActivity(intent);
      Log.d("StartPage", "New Version Installed.");
      finish();
      System.exit(0);

     } catch (Exception ex)
     {

    如何得到当前版本号：

public static int getAppVersionName(Context context)
{
int versionName = -1;
try
{
   PackageManager pm = context.getPackageManager();
   PackageInfo pi = pm.getPackageInfo(context.getPackageName(), 0);
   versionName = pi.versionCode;
   Log.d("versionName ", versionName +"");
} catch (Exception e)
{
   Log.e("GET VER", "Exception", e);
}
return versionName;
}