[网络协议]wifi p2p本机设备名DeviceName设置

wifi p2p系统中本机名称WifiP2pDevice.deviceName是由系统指定的，直接修改并不能起作用。WifiP2pManager类中有设备名称设置方法setDeviceName，可以改变本设备名称。

    /**
     * Set p2p device name.
     * @hide
     * @param c is the channel created at {@link #initialize}
     * @param listener for callback when group info is available. Can be null.
     */
    @UnsupportedAppUsage
    public void setDeviceName(Channel c, String devName, ActionListener listener) {
        checkChannel(c);
        WifiP2pDevice d = new WifiP2pDevice();
        d.deviceName = devName;
        c.mAsyncChannel.sendMessage(SET_DEVICE_NAME, 0, c.putListener(listener), d);
    }

但是这个方法是 @UnsupportedAppUsage的，不能在app中直接使用。无奈只好用反射机制取得该方法，kotlin代码如下：

    private fun setDeviceName(deviceName: String) {
        try {
            val paramTypes0 = WifiP2pManager.Channel::class.java
            val paramTypes1 = String::class.java
            val paramTypes2 = WifiP2pManager.ActionListener::class.java

            val setDeviceName: Method = wifiP2pManager.javaClass.getMethod(
                "setDeviceName", paramTypes0, paramTypes1, paramTypes2
            )
            setDeviceName.isAccessible = true
            setDeviceName.invoke(wifiP2pManager, channel,
                deviceName,
                object : WifiP2pManager.ActionListener {
                    override fun onSuccess() {
                        Log.i(thisTag, "setDeviceName succeeded")
                    }

                    override fun onFailure(reason: Int) {
                        Log.i(thisTag, "setDeviceName failed")
                    }
                })
        } catch (e: NoSuchMethodException) {
            e.printStackTrace()
        } catch (e: IllegalAccessException) {
            e.printStackTrace()
        } catch (e: IllegalArgumentException) {
            e.printStackTrace()
        } catch (e: InvocationTargetException) {
            e.printStackTrace()
        }
    }

其中两个变量wifiP2pManager、channel是WifiP2pManager和WifiP2pManager.Channel的实例，需要在app中取得。

wifiP2pManager =  app.getSystemService(Context.WIFI_P2P_SERVICE) as WifiP2pManager
channel = wifiP2pManager.initialize(app, Looper.getMainLooper(), this)

setDeviceName的时机通常是取得wifiP2pManager、channel之后。