android 4.4 蓝牙开发总结（电视盒子）

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Coder_Hcy/article/details/84103003

6.0的蓝牙已经开发完毕，因为可以得到系统6.0的jar包，so也就开发的快些，更好些。4.4因为代码部分在setting模块里，部分在系统中，so不方便打成jar包。所以就通过广播接受改变状态之类的。也算鼓捣出来一款。

4.4蓝牙效果

开发的思路：

1.开关蓝牙

2.扫描到蓝牙列表和得到配对列表

下面关于连接蓝牙：

A2dp：这个是蓝牙音频传输协议

AVRCP:输入设备控制协议

首先要弄清当前蓝牙的功能属于那种协议，具体代码判断协议的方法不清楚。（本项目用不到）

3.连接蓝牙

4.断开蓝牙与取消配对

1.开关蓝牙

   /**
     * 打开蓝牙or关闭蓝牙
     * @param flag true：open
     */
    public void openOrCloseBluetooth(boolean flag) {
        if (flag) {
            mBluetoothAdapter.enable();
        } else {
            mBluetoothAdapter.disable();
        }
    }

2.扫描到蓝牙列表和得到配对列表

扫描蓝牙

//开始扫描
    public void startScan() {
        if (mBluetoothAdapter != null) {
            // scanResultList.clear();
            if (mBluetoothAdapter.isDiscovering()) {
                Log.d(TAG, "startScan: cancelDiscovery");
                mBluetoothAdapter.cancelDiscovery();
            }
            mBluetoothAdapter.startDiscovery();
            Log.d(TAG, "startScan: 开始扫描周围蓝牙");
        } else {
            Log.d(TAG, "startScan: 扫描周围蓝牙异常");
        }
    }

扫描之后如何获取扫描结果主要通过广播获取

  private void registerBluetoothBroadcastReceiver(Context context) {
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);//蓝牙状态改变的广播
        filter.addAction(BluetoothDevice.ACTION_FOUND);//找到设备的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//搜索完成的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);//开始扫描的广播
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);//状态改变
        filter.addAction(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED);
        if (mReceiver == null) {
            mReceiver = new BluetoothBroadCasteReceiver();
        }
        Log.d(TAG, "registerBluetoothBroadcastReceiver: 注册蓝牙广播" + mBluetoothAdapter.isEnabled());
        context.registerReceiver(mReceiver, filter);
    }

接受器中主要处理这三个状态

                case BluetoothAdapter.ACTION_DISCOVERY_STARTED:
                    Log.d(TAG, "onReceive: 开始扫描。");
                    break;
                case BluetoothAdapter.ACTION_DISCOVERY_FINISHED:
                    Log.d(TAG, "onReceive: 扫描结束。");
                    if (callBack != null) {
                        //callBack.scan_result(scanResultList,            getHasConnectBlueDevices());
                        callBack.scanEnd();
                    }
                    break;
                case BluetoothDevice.ACTION_CLASS_CHANGED:
                    Log.d(TAG, "onReceive: 一个已经改变的远程设备的蓝牙类。");
                    break;
                case BluetoothDevice.ACTION_FOUND:
                    device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    BluetoothDeviceBean bluetoothDeviceBean = new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE);
                    if (device != null) {
                        //发现的设备统一给一个未配对的状态
                        if (callBack != null) {
                            callBack.foundDevice(bluetoothDeviceBean, getHasConnectBlueDevices());
                        }
                        Log.d(TAG, "onReceive: 远程设备发现。" + device.getName() + "??" + device.getAddress() + "???" + device.getBondState());
                    }
                    break;

tips：

1.扫描蓝牙的时候，扫描结束的广播等待时间较长，为了页面体验就在发现设备的广播中，做数据的收集，但注意的是同一个设备会多次被发现，所以数据要做一些扁平化处理

2.扫描的结果也包含了已经配对的，so数据应该做一些处理

获得已经配对的列表

 /**
     * 获得已经配对的蓝牙列表
     * @return
     */
    public Set<BluetoothDeviceBean> getHasConnectBlueDevices() {
        Set<BluetoothDevice> bondedDevices = mBluetoothAdapter.getBondedDevices();
        Set<BluetoothDeviceBean> bluetoothDeviceBeans = new LinkedHashSet<>();
        if (bondedDevices != null) {
            for (BluetoothDevice de :
                    bondedDevices) {
                bluetoothDeviceBeans.add(new BluetoothDeviceBean(de, Bluetooth_State.State_BOND_BONDED));
            }
            Log.e(TAG, "getHasConnectBlueDevices: 已经配对的蓝牙设备" + bluetoothDeviceBeans.toString());
            return bluetoothDeviceBeans;
        } else {
            Log.e(TAG, "没有已经配对的蓝牙设备");
            return bluetoothDeviceBeans;
        }
    }

tips：已经配对的列表中及时当前的设备没有连接也会显示。

3.连接蓝牙

连接蓝牙主要分为两部分，一部分是配对，配对完成后再连接

配对：

 /**
     * 蓝牙配对
     * @param btClass
     * @param btDevice
     */
    public void createBond(Class btClass, BluetoothDevice btDevice) {
        Method createBondMethod = null;
        try {
            createBondMethod = btClass.getMethod("createBond");
            Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX");
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX1");
        } catch (InvocationTargetException e) {
            Log.d(TAG, "createBond: XXXX2");
            e.printStackTrace();
        }
    }

在广播中得到配对的状态：

               case BluetoothDevice.ACTION_BOND_STATE_CHANGED:
                    int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
                    switch (state) {
                        case BluetoothDevice.BOND_NONE:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_NONE 删除配对" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE));
                            }
                            break;
                        case BluetoothDevice.BOND_BONDING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDING 正在配对" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDING));
                            }
                            break;
                        case BluetoothDevice.BOND_BONDED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDED 配对成功" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDED));
                            }
                            //连接操作
                            conectBluetoothDevice(device);
                            break;
                    }
                    break;

收到配对成功的广播进行连接：

A2dp连接：

 //连接蓝牙
    public void conectBluetoothDevice(BluetoothDevice device) {
        if (mA2dpService != null) {
            try {
                Log.d(TAG, "createBond: 配对成功开始连接");
                mA2dpService.connect(device);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    }

输入控制设备的连接：

 /**
     * 
     * @param device
     * @param isConnect true:连接 false：断开
     */
    private void connectOrDisConnectHidBT(BluetoothDevice device, boolean isConnect) {
        if (mHidService != null) {
            //连接
            try {
                String flag = "";
                if (isConnect) {
                    flag = "connect";
                } else {
                    flag = "disconnect";
                }
                if (mHidService.getProfile() == getInputDeviceHiddenConstant()) {
                    if (device != null) {
                        //得到BluetoothInputDevice然后反射connect连接设备
                        Method method = mHidService.getProxy().getClass().getMethod(flag,
                                new Class[]{BluetoothDevice.class});
                        method.invoke(mHidService.getProxy(), device);
                    }
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
            }
        }
    }

 /**
     * 获取BluetoothProfile中hid的profile，"INPUT_DEVICE"类型隐藏，需反射获取
     * @return
     */
    @SuppressLint("NewApi")
    public static int getInputDeviceHiddenConstant() {
        Class<BluetoothProfile> clazz = BluetoothProfile.class;
        for (Field f : clazz.getFields()) {
            int mod = f.getModifiers();
            if (Modifier.isStatic(mod) && Modifier.isPublic(mod)
                    && Modifier.isFinal(mod)) {
                try {
                    if (f.getName().equals("INPUT_DEVICE")) {
                        return f.getInt(null);
                    }
                } catch (Exception e) {
                }
            }
        }
        return -1;
    }

tips：连接蓝牙的时候，需要开启一个服务，通过广播接受来判定是否连接成功

A2dp的服务：

    private void initA2dpService() {
        Intent i = new Intent(IBluetoothA2dp.class.getName());
        context.bindService(i, mConnection, Context.BIND_AUTO_CREATE);
    }

    IBluetoothA2dp mA2dpService;
    public ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            try {
                mA2dpService = IBluetoothA2dp.Stub.asInterface(service);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub

        }

    };

               case BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED:
                    switch (intent.getIntExtra(BluetoothA2dp.EXTRA_STATE, -1)) {
                        case BluetoothA2dp.STATE_CONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothA2dp.STATE_CONNECTING: " + device.getName() + " connecting");
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTING));
                            }
                            break;
                        case BluetoothA2dp.STATE_CONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (device != null) {
                                if (callBack != null) {
                                    callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTED));
                                }
                                Log.d(TAG, "BluetoothA2dp.STATE_CONNECTED: " + device.getName() + " 连接成功");
                            }
                            break;
                        case BluetoothA2dp.STATE_DISCONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothA2dp.STATE_DISCONNECTING: " + device.getName() + " connecting");
                            break;
                        case BluetoothA2dp.STATE_DISCONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_DISCONNECTED));
                            }
                            Log.d(TAG, "BluetoothA2dp.STATE_DISCONNECTED: " + device.getName() + " disconnected");
                            break;
                    }
                    break;

输入控制设备：

 //判断连接hid设备的服务是否连上
    private BTHidServiceBean mHidService = null;
    /**
     * 查看BluetoothInputDevice源码，connect(BluetoothDevice device)该方法可以连接HID设备，但是查看BluetoothInputDevice这个类
     * 是隐藏类，无法直接使用，必须先通过BluetoothProfile.ServiceListener回调得到BluetoothInputDevice，然后再反射connect方法连接
     */
    private BluetoothProfile.ServiceListener connect = new BluetoothProfile.ServiceListener() {
        @Override
        public void onServiceConnected(int profile, BluetoothProfile proxy) {
            //BluetoothProfile proxy这个已经是BluetoothInputDevice类型了
            mHidService = new BTHidServiceBean(profile, proxy);
        }

        @Override
        public void onServiceDisconnected(int profile) {

        }
    };

 /**
     * 注册输入设备的服务
     */
    private void initHidService() {
        mBluetoothAdapter.getProfileProxy(context, connect, getInputDeviceHiddenConstant());
    }

监听连接的广播：

 private void registerBluetoothBroadcastReceiver(Context context) {
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);//蓝牙状态改变的广播
        filter.addAction(BluetoothDevice.ACTION_FOUND);//找到设备的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//搜索完成的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);//开始扫描的广播
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);//状态改变
        filter.addAction("android.bluetooth.input.profile.action.CONNECTION_STATE_CHANGED");
        if (mReceiver == null) {
            mReceiver = new BluetoothBroadCasteReceiver();
        }
        Log.d(TAG, "registerBluetoothBroadcastReceiver: 注册蓝牙广播" + mBluetoothAdapter.isEnabled());
        context.registerReceiver(mReceiver, filter);
    }

 case "android.bluetooth.input.profile.action.CONNECTION_STATE_CHANGED":
                    switch (intent.getIntExtra(BluetoothProfile.EXTRA_STATE, 0)) {
                        case BluetoothProfile.STATE_CONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothProfile.STATE_CONNECTING: " + device.getName() + " connecting");
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTING));
                            }
                            break;
                        case BluetoothProfile.STATE_CONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (device != null) {
                                if (callBack != null) {
                                    callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTED));
                                }
                                Log.d(TAG, "BluetoothProfile.STATE_CONNECTED: " + device.getName() + " connecting");
                            }
                            break;
                        case BluetoothProfile.STATE_DISCONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothProfile.STATE_DISCONNECTING: " + device.getName() + " connecting");
                            break;
                        case BluetoothProfile.STATE_DISCONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_DISCONNECTED));
                            }
                            Log.d(TAG, "BluetoothProfile.STATE_DISCONNECTED: " + device.getName() + " disconnected");
                            break;
                    }
                    break;

附上如何判定蓝牙是否连接成功：

A2dp：

 /**
     * 判断蓝牙是否已经
     * @param device
     * @return
     */
    public boolean isHasConnected(BluetoothDevice device) {
        try {
            if (mA2dpService.getConnectionState(device) == BluetoothA2dp.STATE_CONNECTED) {
                Log.e(TAG, "isHasConnected: XXX1::" + device.getName() + "？？？" + mA2dpService.getConnectionState(device));
                return true;
            } else {
                Log.e(TAG, "isHasConnected: XXX2::" + device.getName() + "？？？" + mA2dpService.getConnectionState(device));
            }
        } catch (RemoteException e) {
            e.printStackTrace();
        }
        return false;
    }

输入设备：

//判断蓝牙是否已经
    public boolean isHasConnected(BluetoothDevice device) {
        if (mHidService != null) {
            BluetoothProfile proxy = mHidService.getProxy();
            int connectionState = proxy.getConnectionState(device);
            if (connectionState == BluetoothProfile.STATE_CONNECTED) {
                return true;
            }
        }
        return false;
    }

4.断开蓝牙与取消配对

断开蓝牙不等于取消配对

A2dp

   /**
     * 断开蓝牙连接
     * @param device
     */
    public void disConectBluetoothDevice(BluetoothDevice device) {
        if (isHasConnected(device) && mA2dpService != null) {
            try {
                mA2dpService.disconnect(device);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    }

取消配对一定包含断开蓝牙

 /**
     * 清除配对历史
     * @param device
     */
    public void unpairDevice(BluetoothDevice device) {
        try {
            Method m = device.getClass()
                    .getMethod("removeBond", (Class[]) null);
            m.invoke(device, (Object[]) null);
        } catch (Exception e) {
            Log.d(TAG, "清除配对异常" + e.getMessage());
        }
    }

 /**
     * @param currentDevice
     * @param isUnpairDevice 是否取消配对
     */
    public void disconnect(BluetoothDevice currentDevice, boolean isUnpairDevice) {
        Set<BluetoothDeviceBean> hasConnectBlueDevices = helper.getHasConnectBlueDevices();

        if (hasConnectBlueDevices != null) {
            for (BluetoothDeviceBean di :
                    hasConnectBlueDevices) {
                if (di.getDevice().getAddress().equals(currentDevice.getAddress())) {
                    helper.disConectBluetoothDevice(di.getDevice());
                    if (isUnpairDevice) {
                        helper.unpairDevice(di.getDevice());
                    }
                    break;
                }
            }
        }
    }

输入设备：

配对方法是固定的，断开连接上面已经总结

附件1：4.4蓝牙A2dp工具类：

package com.ygjy.setting4_0.bluetooth.uitls;

import android.bluetooth.BluetoothA2dp;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.bluetooth.IBluetoothA2dp;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;
import android.widget.Toast;

import com.ygjy.setting4_0.bluetooth.bean.BluetoothDeviceBean;
import com.ygjy.setting4_0.bluetooth.bean.Bluetooth_State;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

/**
 * @创建人：hcy
 * @创建时间：2018/11/9
 * @作用描述：Function
 **/
public class BlueToothHelper {
    private static final String TAG = "BlueToothHelper>>>";
    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    //private Set<BluetoothDeviceBean> scanResultList;
    private Context context;

    public BlueToothHelper(Context context) {
        //获得蓝牙管理对象
        this.context = context;

        mBluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
        //获得蓝牙适配器
        mBluetoothAdapter = mBluetoothManager.getAdapter();
        //scanResultList = new LinkedHashSet<>();
        if (hasBluetooth()) {
            initA2dpService();
            registerBluetoothBroadcastReceiver(context);
        } else {
            Toast.makeText(context, "当前设备不支持蓝牙", Toast.LENGTH_SHORT).show();
        }
    }


    /**
     * 设备是否支持蓝牙
     *
     * @return true：支持 false：不支持
     */
    public boolean hasBluetooth() {
        if (mBluetoothAdapter != null) {
            Log.d(TAG, "该设备支持蓝牙：本机的蓝牙名称" + mBluetoothAdapter.getName());
            return true;
        } else {
            Log.d(TAG, "该设备不支持蓝牙");
        }
        return false;
    }


    private BroadcastReceiver mReceiver;

    /**
     * 注册广播可以获取扫描结果和配对的状态
     * @param context
     */
    private void registerBluetoothBroadcastReceiver(Context context) {
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);//蓝牙状态改变的广播
        filter.addAction(BluetoothDevice.ACTION_FOUND);//找到设备的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//搜索完成的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);//开始扫描的广播
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);//状态改变
        filter.addAction(BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED);
        if (mReceiver == null) {
            mReceiver = new BluetoothBroadCasteReceiver();
        }
        Log.d(TAG, "registerBluetoothBroadcastReceiver: 注册蓝牙广播" + mBluetoothAdapter.isEnabled());
        context.registerReceiver(mReceiver, filter);
    }

    public void unregisterBluetoothBroadCastReceiver(Context context) {

        if (mBluetoothAdapter != null) {
            mBluetoothAdapter.cancelDiscovery();
        }
        if (mA2dpService != null) {
            context.unbindService(mConnection);
        }
        if (mReceiver != null) {
            context.unregisterReceiver(mReceiver);
        }
    }


    //开始扫描
    public void startScan() {
        if (mBluetoothAdapter != null) {
            // scanResultList.clear();
            if (mBluetoothAdapter.isDiscovering()) {
                Log.d(TAG, "startScan: cancelDiscovery");
                mBluetoothAdapter.cancelDiscovery();
            }
            mBluetoothAdapter.startDiscovery();
            Log.d(TAG, "startScan: 开始扫描周围蓝牙");
        } else {
            Log.d(TAG, "startScan: 扫描周围蓝牙异常");
        }
    }

    //判断蓝牙是否已经开启
    public boolean isEnabled() {
        boolean bluetooth_state = mBluetoothAdapter.isEnabled();
        Log.d(TAG, "isEnabled: 蓝牙当前是否开启::" + bluetooth_state);
        return bluetooth_state;
    }

    /**
     * 打开蓝牙or关闭蓝牙
     * @param flag true：open
     */
    public void openOrCloseBluetooth(boolean flag) {
        if (flag) {
            mBluetoothAdapter.enable();
        } else {
            mBluetoothAdapter.disable();
        }
    }


    //蓝牙的广播
    public class BluetoothBroadCasteReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            BluetoothDevice device = null;
            switch (action) {
                case BluetoothAdapter.ACTION_DISCOVERY_STARTED:
                    Log.d(TAG, "onReceive: 开始扫描。");
                    break;
                case BluetoothAdapter.ACTION_DISCOVERY_FINISHED:
                    Log.d(TAG, "onReceive: 扫描结束。");
                    if (callBack != null) {
                        //callBack.scan_result(scanResultList, getHasConnectBlueDevices());
                        callBack.scanEnd();
                    }
                    break;
                case BluetoothDevice.ACTION_CLASS_CHANGED:
                    Log.d(TAG, "onReceive: 一个已经改变的远程设备的蓝牙类。");
                    break;
                case BluetoothDevice.ACTION_FOUND:
                    device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    BluetoothDeviceBean bluetoothDeviceBean = new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE);
                    if (device != null) {
                        //发现的设备统一给一个未配对的状态
                        if (callBack != null) {
                            callBack.foundDevice(bluetoothDeviceBean, getHasConnectBlueDevices());
                        }
                        Log.d(TAG, "onReceive: 远程设备发现。" + device.getName() + "??" + device.getAddress() + "???" + device.getBondState());
                    }
                    break;
                case BluetoothDevice.ACTION_BOND_STATE_CHANGED:
                    int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
                    switch (state) {
                        case BluetoothDevice.BOND_NONE:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_NONE 删除配对" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE));
                            }
                            break;
                        case BluetoothDevice.BOND_BONDING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDING 正在配对" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDING));
                            }
                            break;
                        case BluetoothDevice.BOND_BONDED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDED 配对成功" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDED));
                            }
                            //连接操作
                            conectBluetoothDevice(device);
                            break;
                    }
                    break;

                case BluetoothAdapter.ACTION_STATE_CHANGED:
                    int blueState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);
                    switch (blueState) {
                        case BluetoothAdapter.STATE_TURNING_ON:
                            break;
                        case BluetoothAdapter.STATE_ON:
                            Log.d(TAG, "onReceives: 蓝牙已经打开");
                            if (callBack != null) {
                                callBack.bluetooth_openOrClose(true);
                            }


                            break;
                        case BluetoothAdapter.STATE_TURNING_OFF:
                            break;
                        case BluetoothAdapter.STATE_OFF:
                            Log.d(TAG, "onReceives: 蓝牙已经关闭");
                            if (callBack != null) {
                                callBack.bluetooth_openOrClose(false);
                            }
                            break;
                    }
                    break;
                case BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED:
                    switch (intent.getIntExtra(BluetoothA2dp.EXTRA_STATE, -1)) {
                        case BluetoothA2dp.STATE_CONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothA2dp.STATE_CONNECTING: " + device.getName() + " connecting");
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTING));
                            }
                            break;
                        case BluetoothA2dp.STATE_CONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (device != null) {
                                if (callBack != null) {
                                    callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTED));
                                }
                                Log.d(TAG, "BluetoothA2dp.STATE_CONNECTED: " + device.getName() + " 连接成功");
                            }
                            break;
                        case BluetoothA2dp.STATE_DISCONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothA2dp.STATE_DISCONNECTING: " + device.getName() + " connecting");
                            break;
                        case BluetoothA2dp.STATE_DISCONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_DISCONNECTED));
                            }
                            Log.d(TAG, "BluetoothA2dp.STATE_DISCONNECTED: " + device.getName() + " disconnected");
                            break;
                    }
                    break;
            }
        }
    }

    //连接蓝牙
    public void conectBluetoothDevice(BluetoothDevice device) {
        if (mA2dpService != null) {
            try {
                Log.d(TAG, "createBond: 配对成功开始连接");
                mA2dpService.connect(device);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 断开蓝牙连接
     * @param device
     */
    public void disConectBluetoothDevice(BluetoothDevice device) {
        if (isHasConnected(device) && mA2dpService != null) {
            try {
                mA2dpService.disconnect(device);
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    }


    public interface BuletoothCallBack {
        void foundDevice(BluetoothDeviceBean deviceBean, Set<BluetoothDeviceBean> hasBoundSet);

        void scan_result(Set<BluetoothDeviceBean> list, Set<BluetoothDeviceBean> hasBoundSet);

        void scanEnd();

        void bluetooth_openOrClose(boolean b);

        void update_state(BluetoothDeviceBean deviceBean);
    }


    private BuletoothCallBack callBack;

    public void setCallBack(BuletoothCallBack callBack) {
        this.callBack = callBack;
    }


    public boolean isConnectedAddress(BluetoothDevice _b) {
        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        Class<BluetoothAdapter> bluetoothAdapterClass = BluetoothAdapter.class;//得到BluetoothAdapter的Class对象
        try {//得到蓝牙状态的方法
            Method method = bluetoothAdapterClass.getDeclaredMethod("getConnectionState", (Class[]) null);
            //打开权限
            method.setAccessible(true);
            int state = (int) method.invoke(bluetoothAdapter, (Object[]) null);
            if (state == BluetoothAdapter.STATE_CONNECTED) {
                Log.i(TAG, "BluetoothAdapter.STATE_CONNECTED");
                Set<BluetoothDevice> devices = bluetoothAdapter.getBondedDevices();
                Log.i(TAG, "devices:" + devices.size());
                for (BluetoothDevice device : devices) {
                    Method isConnectedMethod = BluetoothDevice.class.getDeclaredMethod("isConnected", (Class[]) null);
                    method.setAccessible(true);
                    boolean isConnected = (boolean) isConnectedMethod.invoke(device, (Object[]) null);
                    if (isConnected) {
                        Log.i(TAG, "connected:" + device.getAddress());
                        if (getAddress(_b).equals(device.getAddress())) {
                            return true;
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    public String getAddress(BluetoothDevice device) {
        return device.getAddress();
    }


    /**
     * 获得已经配对的蓝牙列表
     * @return
     */
    public Set<BluetoothDeviceBean> getHasConnectBlueDevices() {
        Set<BluetoothDevice> bondedDevices = mBluetoothAdapter.getBondedDevices();
        Set<BluetoothDeviceBean> bluetoothDeviceBeans = new LinkedHashSet<>();
        if (bondedDevices != null) {
            for (BluetoothDevice de :
                    bondedDevices) {
                bluetoothDeviceBeans.add(new BluetoothDeviceBean(de, Bluetooth_State.State_BOND_BONDED));
            }
            Log.e(TAG, "getHasConnectBlueDevices: 已经配对的蓝牙设备" + bluetoothDeviceBeans.toString());
            return bluetoothDeviceBeans;
        } else {
            Log.e(TAG, "没有已经配对的蓝牙设备");
            return bluetoothDeviceBeans;
        }
    }

    /**
     * 清除配对历史
     * @param device
     */
    public void unpairDevice(BluetoothDevice device) {
        try {
            Method m = device.getClass()
                    .getMethod("removeBond", (Class[]) null);
            m.invoke(device, (Object[]) null);
        } catch (Exception e) {
            Log.d(TAG, "清除配对异常" + e.getMessage());
        }
    }

    /**
     * 蓝牙配对
     * @param btClass
     * @param btDevice
     */
    public void createBond(Class btClass, BluetoothDevice btDevice) {
        Method createBondMethod = null;
        try {
            createBondMethod = btClass.getMethod("createBond");
            Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX");
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX1");
        } catch (InvocationTargetException e) {
            Log.d(TAG, "createBond: XXXX2");
            e.printStackTrace();
        }
    }


    private void initA2dpService() {
        Intent i = new Intent(IBluetoothA2dp.class.getName());
        context.bindService(i, mConnection, Context.BIND_AUTO_CREATE);
    }

    IBluetoothA2dp mA2dpService;
    public ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            try {
                mA2dpService = IBluetoothA2dp.Stub.asInterface(service);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            // TODO Auto-generated method stub

        }

    };

    public Intent getExplicitIntent(Context context, Intent implicitIntent) {
        // Retrieve all services that can match the given intent
        PackageManager pm = context.getPackageManager();
        List<ResolveInfo> resolveInfo = pm.queryIntentServices(implicitIntent, 0);
        // Make sure only one match was found
        if (resolveInfo == null || resolveInfo.size() != 1) {
            return null;
        }
        // Get component info and create ComponentName
        ResolveInfo serviceInfo = resolveInfo.get(0);
        String packageName = serviceInfo.serviceInfo.packageName;
        String className = serviceInfo.serviceInfo.name;
        ComponentName component = new ComponentName(packageName, className);
        // Create a new intent. Use the old one for extras and such reuse
        Intent explicitIntent = new Intent(implicitIntent);
        // Set the component to be explicit
        explicitIntent.setComponent(component);
        return explicitIntent;
    }


    /**
     * 判断蓝牙是否已经
     * @param device
     * @return
     */
    public boolean isHasConnected(BluetoothDevice device) {
        try {
            if (mA2dpService.getConnectionState(device) == BluetoothA2dp.STATE_CONNECTED) {
                Log.e(TAG, "isHasConnected: XXX1::" + device.getName() + "？？？" + mA2dpService.getConnectionState(device));
                return true;
            } else {
                Log.e(TAG, "isHasConnected: XXX2::" + device.getName() + "？？？" + mA2dpService.getConnectionState(device));
            }
        } catch (RemoteException e) {
            e.printStackTrace();
        }
        return false;
    }
}

附件2：蓝牙输入控制设备的工具类：

package com.ygjy.setting4_0.bluetooth.uitls;

import android.annotation.SuppressLint;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.widget.Toast;

import com.ygjy.setting4_0.bluetooth.bean.BTHidServiceBean;
import com.ygjy.setting4_0.bluetooth.bean.BluetoothDeviceBean;
import com.ygjy.setting4_0.bluetooth.bean.Bluetooth_State;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * @创建人：hcy
 * @创建时间：2018/11/9
 * @作用描述：Function
 **/
public class BlueToothHelper {
    private static final String TAG = "BlueToothHelper>>>";
    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    //private Set<BluetoothDeviceBean> scanResultList;
    private Context context;
    BluetoothDevice device = null;

    public BlueToothHelper(Context context) {
        //获得蓝牙管理对象
        this.context = context;
        mBluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
        //获得蓝牙适配器
        mBluetoothAdapter = mBluetoothManager.getAdapter();
        //scanResultList = new LinkedHashSet<>();
        if (hasBluetooth()) {
            initHidService();
            registerBluetoothBroadcastReceiver(context);
        } else {
            Toast.makeText(context, "当前设备不支持蓝牙", Toast.LENGTH_SHORT).show();
        }
    }


    /**
     * 设备是否支持蓝牙
     *
     * @return true：支持 false：不支持
     */
    public boolean hasBluetooth() {
        if (mBluetoothAdapter != null) {
            Log.d(TAG, "该设备支持蓝牙：本机的蓝牙名称" + mBluetoothAdapter.getName());
            return true;
        } else {
            Log.d(TAG, "该设备不支持蓝牙");
        }
        return false;
    }


    private BroadcastReceiver mReceiver;

    private void registerBluetoothBroadcastReceiver(Context context) {
        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);//蓝牙状态改变的广播
        filter.addAction(BluetoothDevice.ACTION_FOUND);//找到设备的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);//搜索完成的广播
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);//开始扫描的广播
        filter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);//状态改变
        filter.addAction("android.bluetooth.input.profile.action.CONNECTION_STATE_CHANGED");
        if (mReceiver == null) {
            mReceiver = new BluetoothBroadCasteReceiver();
        }
        Log.d(TAG, "registerBluetoothBroadcastReceiver: 注册蓝牙广播" + mBluetoothAdapter.isEnabled());
        context.registerReceiver(mReceiver, filter);
    }

    public void unregisterBluetoothBroadCastReceiver(Context context) {

        if (mBluetoothAdapter != null) {
            mBluetoothAdapter.cancelDiscovery();
        }
//        if (mA2dpService != null) {
//            context.unbindService(mConnection);
//        }
        if (mReceiver != null) {
            context.unregisterReceiver(mReceiver);
        }
    }


    //开始扫描
    public void startScan() {
        if (mBluetoothAdapter != null) {
            // scanResultList.clear();
            if (mBluetoothAdapter.isDiscovering()) {
                Log.d(TAG, "startScan: cancelDiscovery");
                mBluetoothAdapter.cancelDiscovery();
            }
            mBluetoothAdapter.startDiscovery();
            Log.d(TAG, "startScan: 开始扫描周围蓝牙");
        } else {
            Log.d(TAG, "startScan: 扫描周围蓝牙异常");
        }
    }

    //判断蓝牙是否已经开启
    public boolean isEnabled() {
        boolean bluetooth_state = mBluetoothAdapter.isEnabled();
        Log.d(TAG, "isEnabled: 蓝牙当前是否开启::" + bluetooth_state);
        return bluetooth_state;
    }

    public void openOrCloseBluetooth(boolean flag) {
        if (flag) {
            mBluetoothAdapter.enable();
        } else {
            mBluetoothAdapter.disable();
        }
    }


    //蓝牙的广播
    public class BluetoothBroadCasteReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            switch (action) {
                case BluetoothAdapter.ACTION_DISCOVERY_STARTED:
                    Log.d(TAG, "onReceive: 开始扫描。");
                    break;
                case BluetoothAdapter.ACTION_DISCOVERY_FINISHED:

                    if (callBack != null) {
                        //callBack.scan_result(scanResultList, getHasConnectBlueDevices());
                        callBack.scanEnd();
                    }
                    break;
                case BluetoothDevice.ACTION_CLASS_CHANGED:
                    Log.d(TAG, "onReceive: 一个已经改变的远程设备的蓝牙类。");
                    break;
                case BluetoothDevice.ACTION_FOUND:
                    device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    BluetoothDeviceBean bluetoothDeviceBean = new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE);
                    if (device != null) {
                        //发现的设备统一给一个未配对的状态
                        if (callBack != null) {
                            callBack.foundDevice(bluetoothDeviceBean, getHasConnectBlueDevices());
                        }
                        Log.d(TAG, "onReceive: 远程设备发现。" + device.getName() + "??" + device.getAddress() + "???" + device.getBondState());
                    }
                    break;
                case BluetoothDevice.ACTION_BOND_STATE_CHANGED:
                    int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
                    switch (state) {
                        case BluetoothDevice.BOND_NONE:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_NONE 删除配对" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_NONE));
                            }
                            break;
                        case BluetoothDevice.BOND_BONDING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDING 正在配对" + device.getName());

                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDING));
                            }


                            break;
                        case BluetoothDevice.BOND_BONDED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BOND_BONDED 配对成功" + device.getName());
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.State_BOND_BONDED));
                            }
                            conectBluetoothDevice(device);
                            break;
                    }
                    break;

                case BluetoothAdapter.ACTION_STATE_CHANGED:
                    int blueState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, 0);
                    switch (blueState) {
                        case BluetoothAdapter.STATE_TURNING_ON:
                            break;
                        case BluetoothAdapter.STATE_ON:
                            Log.d(TAG, "onReceives: 蓝牙已经打开");
                            if (callBack != null) {
                                callBack.bluetooth_openOrClose(true);
                            }


                            break;
                        case BluetoothAdapter.STATE_TURNING_OFF:
                            break;
                        case BluetoothAdapter.STATE_OFF:
                            Log.d(TAG, "onReceives: 蓝牙已经关闭");
                            if (callBack != null) {
                                callBack.bluetooth_openOrClose(false);
                            }
                            break;
                    }
                    break;
                case "android.bluetooth.input.profile.action.CONNECTION_STATE_CHANGED":
                    switch (intent.getIntExtra(BluetoothProfile.EXTRA_STATE, 0)) {
                        case BluetoothProfile.STATE_CONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothProfile.STATE_CONNECTING: " + device.getName() + " connecting");
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTING));
                            }
                            break;
                        case BluetoothProfile.STATE_CONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (device != null) {
                                if (callBack != null) {
                                    callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_CONNECTED));
                                }
                                Log.d(TAG, "BluetoothProfile.STATE_CONNECTED: " + device.getName() + " connecting");
                            }
                            break;
                        case BluetoothProfile.STATE_DISCONNECTING:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            Log.d(TAG, "BluetoothProfile.STATE_DISCONNECTING: " + device.getName() + " connecting");
                            break;
                        case BluetoothProfile.STATE_DISCONNECTED:
                            device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                            if (callBack != null) {
                                callBack.update_state(new BluetoothDeviceBean(device, Bluetooth_State.STATE_DISCONNECTED));
                            }
                            Log.d(TAG, "BluetoothProfile.STATE_DISCONNECTED: " + device.getName() + " disconnected");
                            break;
                    }
                    break;
            }
        }
    }

    //连接蓝牙
    public void conectBluetoothDevice(BluetoothDevice device) {
        connectOrDisConnectHidBT(device, true);
    }

    /**
     *
     * @param device
     * @param isConnect true:连接 false：断开
     */
    private void connectOrDisConnectHidBT(BluetoothDevice device, boolean isConnect) {
        if (mHidService != null) {
            //连接
            try {
                String flag = "";
                if (isConnect) {
                    flag = "connect";
                } else {
                    flag = "disconnect";
                }
                if (mHidService.getProfile() == getInputDeviceHiddenConstant()) {
                    if (device != null) {
                        //得到BluetoothInputDevice然后反射connect连接设备
                        Method method = mHidService.getProxy().getClass().getMethod(flag,
                                new Class[]{BluetoothDevice.class});
                        method.invoke(mHidService.getProxy(), device);
                    }
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                // e.printStackTrace();
            }
        }
    }

    public void disConectBluetoothDevice(BluetoothDevice device) {
        if (isHasConnected(device)) {
            //如果设备连接就让他断开连接
            connectOrDisConnectHidBT(device, false);
        }
    }

    //判断连接hid设备的服务是否连上
    private BTHidServiceBean mHidService = null;
    /**
     * 查看BluetoothInputDevice源码，connect(BluetoothDevice device)该方法可以连接HID设备，但是查看BluetoothInputDevice这个类
     * 是隐藏类，无法直接使用，必须先通过BluetoothProfile.ServiceListener回调得到BluetoothInputDevice，然后再反射connect方法连接
     */
    private BluetoothProfile.ServiceListener connect = new BluetoothProfile.ServiceListener() {
        @Override
        public void onServiceConnected(int profile, BluetoothProfile proxy) {
            //BluetoothProfile proxy这个已经是BluetoothInputDevice类型了
            mHidService = new BTHidServiceBean(profile, proxy);
        }

        @Override
        public void onServiceDisconnected(int profile) {

        }
    };


    /**
     * 获取BluetoothProfile中hid的profile，"INPUT_DEVICE"类型隐藏，需反射获取
     * @return
     */
    @SuppressLint("NewApi")
    public static int getInputDeviceHiddenConstant() {
        Class<BluetoothProfile> clazz = BluetoothProfile.class;
        for (Field f : clazz.getFields()) {
            int mod = f.getModifiers();
            if (Modifier.isStatic(mod) && Modifier.isPublic(mod)
                    && Modifier.isFinal(mod)) {
                try {
                    if (f.getName().equals("INPUT_DEVICE")) {
                        return f.getInt(null);
                    }
                } catch (Exception e) {
                }
            }
        }
        return -1;
    }


    public interface BuletoothCallBack {
        void foundDevice(BluetoothDeviceBean deviceBean, Set<BluetoothDeviceBean> hasBoundSet);

        void scan_result(Set<BluetoothDeviceBean> list, Set<BluetoothDeviceBean> hasBoundSet);

        void scanEnd();

        void bluetooth_openOrClose(boolean b);

        void update_state(BluetoothDeviceBean deviceBean);
    }


    private BuletoothCallBack callBack;

    public void setCallBack(BuletoothCallBack callBack) {
        this.callBack = callBack;
    }


    public boolean isConnectedAddress(BluetoothDevice _b) {
        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        Class<BluetoothAdapter> bluetoothAdapterClass = BluetoothAdapter.class;//得到BluetoothAdapter的Class对象
        try {//得到蓝牙状态的方法
            Method method = bluetoothAdapterClass.getDeclaredMethod("getConnectionState", (Class[]) null);
            //打开权限
            method.setAccessible(true);
            int state = (int) method.invoke(bluetoothAdapter, (Object[]) null);
            if (state == BluetoothAdapter.STATE_CONNECTED) {
                Log.i(TAG, "BluetoothAdapter.STATE_CONNECTED");
                Set<BluetoothDevice> devices = bluetoothAdapter.getBondedDevices();
                Log.i(TAG, "devices:" + devices.size());
                for (BluetoothDevice device : devices) {
                    Method isConnectedMethod = BluetoothDevice.class.getDeclaredMethod("isConnected", (Class[]) null);
                    method.setAccessible(true);
                    boolean isConnected = (boolean) isConnectedMethod.invoke(device, (Object[]) null);
                    if (isConnected) {
                        Log.i(TAG, "connected:" + device.getAddress());
                        if (getAddress(_b).equals(device.getAddress())) {
                            return true;
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    public String getAddress(BluetoothDevice device) {
        return device.getAddress();
    }


    public Set<BluetoothDeviceBean> getHasConnectBlueDevices() {
        Set<BluetoothDevice> bondedDevices = mBluetoothAdapter.getBondedDevices();
        Set<BluetoothDeviceBean> bluetoothDeviceBeans = new LinkedHashSet<>();
        if (bondedDevices != null) {
            for (BluetoothDevice de :
                    bondedDevices) {
                bluetoothDeviceBeans.add(new BluetoothDeviceBean(de, Bluetooth_State.State_BOND_BONDED));
            }
            Log.e(TAG, "getHasConnectBlueDevices: 已经配对的蓝牙设备" + bluetoothDeviceBeans.toString());
            return bluetoothDeviceBeans;
        } else {
            Log.e(TAG, "没有已经配对的蓝牙设备");
            return bluetoothDeviceBeans;
        }
    }

    //清除配对历史
    public void unpairDevice(BluetoothDevice device) {
        try {
            Method m = device.getClass()
                    .getMethod("removeBond", (Class[]) null);
            m.invoke(device, (Object[]) null);
        } catch (Exception e) {
            Log.d(TAG, "清除配对异常" + e.getMessage());
        }
    }


    public void createBond(Class btClass, BluetoothDevice btDevice) {
        Method createBondMethod = null;
        try {
            createBondMethod = btClass.getMethod("createBond");
            Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);

        } catch (NoSuchMethodException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX");
        } catch (IllegalAccessException e) {
            e.printStackTrace();
            Log.d(TAG, "createBond: XXXX1");
        } catch (InvocationTargetException e) {
            Log.d(TAG, "createBond: XXXX2");
            e.printStackTrace();
        }
    }

    /**
     * 注册输入设备的服务
     */
    private void initHidService() {
        mBluetoothAdapter.getProfileProxy(context, connect, getInputDeviceHiddenConstant());
    }


    //判断蓝牙是否已经
    public boolean isHasConnected(BluetoothDevice device) {
        if (mHidService != null) {
            BluetoothProfile proxy = mHidService.getProxy();
            int connectionState = proxy.getConnectionState(device);
            if (connectionState == BluetoothProfile.STATE_CONNECTED) {
                return true;
            }
        }
        return false;
    }
}