廣告 BLE 裝置

你可以使用藍芽 LE 廣告將資料包廣播到所有附近的裝置，而無需先建立連線。請記住，嚴格限制 31 個位元組的廣告資料。宣傳你的裝置也是讓其他使用者與你聯絡的第一步。

由於並非所有裝置都支援藍芽 LE 廣告，因此第一步是檢查你的裝置是否具備支援它的所有必要要求。之後，你可以初始化 BluetoothLeAdvertiser 物件，並使用它，你可以開始廣告操作：

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && bluetoothAdapter.isMultipleAdvertisementSupported())
        {
            BluetoothLeAdvertiser advertiser = bluetoothAdapter.getBluetoothLeAdvertiser();

            AdvertiseData.Builder dataBuilder = new AdvertiseData.Builder();
           //Define a service UUID according to your needs                
           dataBuilder.addServiceUuid(SERVICE_UUID);
            dataBuilder.setIncludeDeviceName(true);

             AdvertiseSettings.Builder settingsBuilder = new AdvertiseSettings.Builder();
             settingsBuilder.setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_POWER);
             settingsBuilder.setTimeout(0);

             //Use the connectable flag if you intend on opening a Gatt Server
             //to allow remote connections to your device.
             settingsBuilder.setConnectable(true);

            AdvertiseCallback advertiseCallback=new AdvertiseCallback() {
            @Override
            public void onStartSuccess(AdvertiseSettings settingsInEffect) {
                super.onStartSuccess(settingsInEffect);
                Log.i(TAG, "onStartSuccess: ");
            }

            @Override
            public void onStartFailure(int errorCode) {
                super.onStartFailure(errorCode);
                Log.e(TAG, "onStartFailure: "+errorCode );
            }
          };
advertising.startAdvertising(settingsBuilder.build(),dataBuilder.build(),advertiseCallback);
        }