PackageManager packageManager=this.getPackageManager();

     try {

    PackageInfo packageInfo=packageManager.getPackageInfo(this.getPackageName(), 0);

    long firstInstallTime=packageInfo.firstInstallTime;//应用第一次安装的时间

    int versionCode=packageInfo.versionCode;//应用现在的版本号

    String versionName=packageInfo.versionName;//应用现在的版本名称

    System.out.println("firstInstallTime="+firstInstallTime+",versionCode="+versionCode+",versionName="+versionName);  

                   //如下可获得更多信息

                      ApplicationInfo   applicationInfo=packageInfo.applicationInfo;

          String name=applicationInfo.name;

    String packageName=applicationInfo.packageName;

    String permission=applicationInfo.permission;

} catch (Exception e) {

    e.printStackTrace();

      }