Android：获取设备的mac地址可靠的方法

    /**            * 获取设备的mac地址            *             * @param ac            * @param callback            *            成功获取到mac地址之后会回调此方法            */            public static void getMacAddress(final Activity ac, final SimpleCallback callback) {                final WifiManager wm = (WifiManager) ac .getSystemService(Service.WIFI_SERVICE);                        // 如果本次开机后打开过WIFI，则能够直接获取到mac信息。立刻返回数据。                WifiInfo info = wm.getConnectionInfo();                if (info != null && info.getMacAddress() != null) {                    if (callback != null) {                        callback.onComplete(info.getMacAddress());                    }                    return;                }                        // 尝试打开WIFI，并获取mac地址                if (!wm.isWifiEnabled()) {                    wm.setWifiEnabled(true);                }                        new Thread(new Runnable() {                    @Override                    public void run() {                        int tryCount = 0;                        final int MAX_COUNT = 10;                                while (tryCount < MAX_COUNT) {                            final WifiInfo info = wm.getConnectionInfo();                            if (info != null && info.getMacAddress() != null) {                                if (callback != null) {                                    ac.runOnUiThread(new Runnable() {                                        @Override                                        public void run() {                                            callback.onComplete(info.getMacAddress());                                        }                                    });                                }                                return;                            }                                    SystemClock.sleep(300);                            tryCount++;                        }                                // 未获取到mac地址                        if (callback != null) {                            callback.onComplete(null);                        }                    }                }).start();            }  

SimpleCallback是一个简单的回调接口：

    public interface SimpleCallback {            void onComplete(String result);        }