NTP 网络时间

NTUSUtils.java

/**
 * Created by chensuilun on 2017/7/4.
 */
public class NTUSUtils {
    private static final String TAG = "NTUSUtils";
    private static final String NTP_TRUSTED_TIME = "android.util.NtpTrustedTime";
    private static final String GET_INSTANCE = "getInstance";//private NtpTrustedTime getInstance(Context context)
    private static final String FORCE_REFRESH = "forceRefresh";  //public boolean forceRefresh()
    private static final String GET_CACHED_NTP_TIME = "getCachedNtpTime";//public long getCachedNtpTime()
    private static Context sContext = AppApplication.getContext();

    private static Method sGetNtpTimeMethod;
    private static Method sForceRefreshMethod;
    private static Class sNTPTrustedTimeClz;
    private static Object sNtpTrustedTimeInstance;


    static {
        try {
            sNTPTrustedTimeClz = Class.forName(NTP_TRUSTED_TIME);
            Method instanceMethod = sNTPTrustedTimeClz.getDeclaredMethod(GET_INSTANCE, Context.class);
            instanceMethod.setAccessible(true);
            sNtpTrustedTimeInstance = instanceMethod.invoke(null, sContext);
            sGetNtpTimeMethod = sNTPTrustedTimeClz.getDeclaredMethod(GET_CACHED_NTP_TIME);
            sForceRefreshMethod = sNTPTrustedTimeClz.getDeclaredMethod(FORCE_REFRESH);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
    
    @WorkerThread
    public static boolean forceFresh() {
        if (BuildConfig.DEBUG) {
            Log.d(TAG, "forceFresh() called with: " + "");
        }
        if (sForceRefreshMethod != null) {
            try {
                return (boolean) sForceRefreshMethod.invoke(sNtpTrustedTimeInstance);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }
        return false;
    }

    public static long getCachedNtpTime() {
        if (BuildConfig.DEBUG) {
            Log.d(TAG, "getCachedNtpTime() called with: " + "");
        }
        if (sGetNtpTimeMethod != null) {
            try {
                return (long) sGetNtpTimeMethod.invoke(sNtpTrustedTimeInstance);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }
        return -1;
    }
}

是调用forceFresh这个方法么 我调用了 没作用