获得android应用的版本号

在开发的过程中，需要获得版本号

     private PackageInfo getVersion() {
         PackageManager packageManager = MyApplication.getInstance().getPackageManager();
         PackageInfo packageInfo = null;
         try {
             packageInfo = packageManager.getPackageInfo(MyApplication.getInstance().getPackageName(), 0);
         } catch (NameNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return packageInfo;
     }

     private String getVersionName() {
         return getVersion().versionName;
     }

     private String getVersionCode() {
         return String.valueOf(getVersion().versionCode);
     }

==完