Unity for Android使用蓝牙低功耗Bluetooth LE

Unity2021.3.35f1

插件：Bluetooth LE for iOS and Android v2.3.unitypackage

1、将插件资源包导入unity中

2.修改插件中的AndroidManifest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.unity3d.player" android:installLocation="preferExternal" android:versionCode="1" android:versionName="1.0"><supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:xlargeScreens="true" android:anyDensity="true" /><uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /><uses-permission android:name="android.permission.BLUETOOTH" /><uses-feature android:name="android.hardware.bluetooth_le" android:required="false" /><application android:icon="@drawable/app_icon" android:label="@string/app_name" android:debuggable="true"><activity android:name="com.unity3d.player.UnityPlayerProxyActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen"></activity><activity android:name="com.unity3d.player.UnityPlayerActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><activity android:name="com.unity3d.player.UnityPlayerNativeActivity" android:label="@string/app_name" android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen"><meta-data android:name="android.app.lib_name" android:value="unity" /><meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" /></activity><meta-data android:name="platform_high" android:value="1" /><meta-data android:name="enable_entitlementcheck" android:value="0" /></application>
</manifest>

3.编写UI

2个按钮：StartScanningBtn（扫描）、DisconnectBtn（断开连接）

2个Text

1个Container(带Vertical Layout Group)，用于显示扫描到的终端

4.制作预制体DeviceInfo，一个Button一个Text，点击按钮可连接蓝牙终端

预制体上挂一个脚本DeviceInfo，代码始下

using UnityEngine;
using UnityEngine.UI;public class DeviceInfo : MonoBehaviour
{public Button btnConnect;public Text textName;public Text textAddress;
}

5.编写BlueToothTest.cs代码

using System;
using System.Collections.Generic;
using System.Text;
using UnityEngine;
using UnityEngine.UI;public class BlueToothTest: MonoBehaviour
{//连接的蓝牙mac地址private string bleAddress;//表示是否开始扫描private bool isScanning;//表示是否已经蓝牙初始化private bool isInit;//设备信息预制体 当扫描到一个设备时就会创建一个实例并放到滚动视图中去public GameObject deviceInfoPrefab;//滚动视图的容器结点public Transform container;//提示的文本信息框  连接提示。。。public Text text;//提示的其他文本信息框  接受数据提示。。。public Text otherText;//断开连接按钮public Button disConnectBtn;//开始扫描按钮public Button startScanningBtn;//以设备名字做个存储，相同名字的就忽视不在扫描private HashSet<string> deviceHashSet = new HashSet<string>();//设备名、设备地址字典private Dictionary<string, string> deviceDictionary = new Dictionary<string, string>();void Start(){Input.location.Start(); //定位InitBluethood();startScanningBtn.onClick.AddListener(() =>{StartScnnning();});disConnectBtn.onClick.AddListener(() =>{DisConnect();});        }/// <summary>/// 初始化蓝牙设备/// </summary>private void InitBluethood(){if (!isInit){BluetoothLEHardwareInterface.Initialize(true, false, () =>{Show("蓝牙初始化成功");//初始化成功执行回调isInit = true;},(error) =>{Show(error.ToString());//初始化失败的回调响应});}}/// <summary>/// 扫描设备/// </summary>private void StartScnnning(){if (!isScanning && isInit){Show("扫描设备中");Input.location.Start(); //定位Invoke("FindDevice", 1f);isScanning = true;}}public void FindDevice(){BluetoothLEHardwareInterface.ScanForPeripheralsWithServices(null, (address, name) =>{if (deviceHashSet.Contains(name)) return;CreationTextPrefab(address, name);//扫描处理，加入设备列表              AddPeripheral(name, address);deviceHashSet.Add(name);}, (address, name, rssi, advertisingInfo) =>{if (deviceHashSet.Contains(name)) return;CreationTextPrefab(address, name);AddPeripheral(name, address);deviceHashSet.Add(name);});}public void Show(string info){text.text = info;}/// <summary>/// 创建提示信息预制件/// </summary>/// <param name="address"></param>/// <param name="name"></param>private void CreationTextPrefab(string address, string name){GameObject game = Instantiate<GameObject>(deviceInfoPrefab);DeviceInfo info = game.GetComponent<DeviceInfo>();info.textName.text = name;info.textAddress.text = address;game.transform.localScale = Vector3.one;game.transform.SetParent(container);info.btnConnect.onClick.AddListener(() =>{if (deviceHashSet.Contains(name)) //找到名字一样的设备{BluetoothLEHardwareInterface.StopScan(); //停止扫描ConnectBluetooth(deviceDictionary[name]);  //开始连接}});}/// <summary>/// 更新存储要连接设备的名字，是否扫描到/// </summary>/// <param name="name"></param>/// <param name="address"></param>public void AddPeripheral(string name, string address){deviceDictionary.Add(name, address);}/// <summary>/// 开始连接设备/// </summary>public void ConnectBluetooth(string adress){Show("开始连接设备");try{BluetoothLEHardwareInterface.ConnectToPeripheral(adress, null, null, (address, serviceUUID, characteristicUUID) =>{otherText.text += "连接成功\n";SubscribeCharacteristicWithDeviceAddress(address, serviceUUID, characteristicUUID);});}catch (Exception e){Show("连接失败");}}/// <summary>/// 连接成功的回调/// </summary>private void SubscribeCharacteristicWithDeviceAddress(string address, string serviceUUID, string characteristicUUID){if(!string.IsNullOrEmpty(serviceUUID) && !string.IsNullOrEmpty(characteristicUUID)){otherText.text += "正在订阅消息："+ serviceUUID + ":" + characteristicUUID + "\n"; bleAddress = address;BluetoothLEHardwareInterface.SubscribeCharacteristicWithDeviceAddress(address, serviceUUID, characteristicUUID, delegate { }, OnCharacteristicNotification);}}/// <summary>/// 收到数据/// </summary>/// <param name="arg1"></param>/// <param name="arg2"></param>/// <param name="arg3"></param>private void OnCharacteristicNotification(string arg1, string arg2, byte[] arg3){//Show("接收到数据");otherText.text = "连接成功" + "\narg1=" + arg1 + "\narg2=" + arg2 + "\n";Show(ByteArrayToString(arg3));}/// <summary>/// 断开连接/// </summary>public void DisConnect(){BluetoothLEHardwareInterface.DisconnectPeripheral(bleAddress, (bleAddress) =>{Show(bleAddress + "已经断开");otherText.text = "";isScanning = false;});}/// <summary>/// 字节组转换为字符串/// </summary>/// <param name="ba"></param>/// <returns></returns>public static string ByteArrayToString(byte[] ba){string hex = BitConverter.ToString(ba);return hex.Replace("-", "");}
}

6.挂载脚本并赋值，打包apk运行