android手机解锁失败?

小生最近有个项目用到了唤醒和解锁，但是我发现三星有些手机上却没有被解锁而只是被唤醒了，不知道各位有没有遇到过类似的情况，如果有可否赐教一二。下面是含有唤醒和解锁的代码片段，希望有高人能为小生指点迷径        KeyguardManager.KeyguardLock keyguardLock;
    PowerManager.WakeLock mWakelock;
    
    keyguardManager = ((KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE));        keyguardLock = keyguardManager.newKeyguardLock("TEST");
    
    /**
     * 解锁键盘
     */
        public void disableKeygrard()
        {
                keyguardLock.disableKeyguard();
                return true;
        }
    
    /**
     * 锁定键盘
     */
        public void reenableKeyguard()
        {
                keyguardLock.reenableKeyguard();
        }
    /**
     * 得到唤醒锁
     */
        private void lock()
        {
                PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
                if(mWakelock == null)
                {
                        mWakelock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK, "XYTEST");
                        mWakelock.acquire();
                }
        }        /**
     * 释放唤醒缩
         */
        private void unLock()
        {
                if (mWakelock != null)
                {
                        mWakelock.release();
                        mWakelock = null;
                }
        }        // 下面是解锁操作        public void open()
        {
                lock();
                disableKeygrard();
                // 事件处理.....
                reenableKeyguard();
                unLock();
        }