Android 獲取當前應用版本名稱

private String getVersionName(){
        PackageManager pm=getPackageManager();

        try {
            PackageInfo info=pm.getPackageInfo(getPackageName(), 0);
            return info.versionName;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
            return "";
        }
    }