在Android4.3之前，支持低功耗蓝牙的Android设备只能充当中央设备。正如Android4.3BluetoothLE中给出的那样文档:Android4.3(APILevel18)introducesbuilt-inplatformsupportforBluetoothLowEnergyinthecentralroleandprovidesAPIsthatappscanusetodiscoverdevices,queryforservices,andread/writecharacteristics.随着Android4.4KitKat的介绍，它现在也可以充当外围设备吗？我找不