获取系统当前版本

/** * 获取版本号 * * @return 当前应用的版本号 */public static String getVersion() {    try {        PackageManager manager = mInstance.getPackageManager();        PackageInfo info = manager.getPackageInfo(mInstance.getPackageName(), 0);        String version = info.versionName;        return version;    } catch (Exception e) {        e.printStackTrace();        return "";    }}