Android 判断是否 锁屏状态

判断是否是锁屏状态：

    public boolean isLockScreenOn() {
        KeyguardManager mKeyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);   
        if (mKeyguardManager.inKeyguardRestrictedInputMode()) {  
            return true;
        } else {
            return false;
        }
    }