获取Android应用的初次安装时间,版本号等信息

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();          }