public class AppUtils {

    private AppUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");

    }

    /**
     * 獲取應用程式名稱
     */
    public static String getAppName(Context context) {
        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packageInfo = packageManager.getPackageInfo(
                    context.getPackageName(), 0);
            int labelRes = packageInfo.applicationInfo.labelRes;
            return context.getResources().getString(labelRes);
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * [獲取應用程式版本名稱資訊]
     *
     * @param context
     * @return 當前應用的版本名稱
     */
    public static String getVersionName(Context context) {
        try {
            PackageManager packageManager = context.getPackageManager();
            PackageInfo packageInfo = packageManager.getPackageInfo(
                    context.getPackageName(), 0);
            return packageInfo.versionName;

        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }


    /*
    獲取版本號
     */
    public static int getVersionCode(Context context) {
        try {
            PackageInfo packageInfo = context.getPackageManager()
                    .getPackageInfo(getPackageName(), 0);
            //獲取APP版本versionName
            String versionName = packageInfo.versionName;
            //獲取APP版本versionCode
            int versionCode = packageInfo.versionCode;
            return versionCode;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return 0;
    }
}