在工作中遇到一个问题：在蓝牙连接时需要跳过pin验证，当时找了很多博客，最后基本解决（有些room会出问题），因为在简书中没有搜到该问题的解决方案所以就写下这篇博客。
基本解决思路：

1、使用反射调用BluetoothDevice的setPin方法。
2、接收系统的弹出的验证pin码的弹框的广播，及时终止。

1、注册广播

       <receiver android:name=".BluetoothConnectActivityReceiver" >
            <intent-filter android:priority="1000">
                <action android:name="android.bluetooth.device.action.PAIRING_REQUEST" />
            </intent-filter>
        </receiver>

public class BluetoothConnectActivityReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if ("android.bluetooth.device.action.PAIRING_REQUEST".equals(intent.getAction())) {
            BluetoothDevice mBluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            try {
                //(三星)4.3版本测试手机还是会弹出用户交互页面(闪一下)，如果不注释掉下面这句页面不会取消但可以配对成功。(中兴，魅族4(Flyme 6))5.1版本手机两中情况下都正常
                //ClsUtils.setPairingConfirmation(mBluetoothDevice.getClass(), mBluetoothDevice, true);
                abortBroadcast();//如果没有将广播终止，则会出现一个一闪而过的配对框。
                //3.调用setPin方法进行配对...
                boolean ret = ClsUtils.setPin(mBluetoothDevice.getClass(), mBluetoothDevice, "你需要设置的PIN码");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

最后把ClsUtils贴出来，网上这个类应该是很多的。我已开始也用到了，因为没有监听上面的广播所以失败了。

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import android.bluetooth.BluetoothDevice;
import android.util.Log;

public class ClsUtils {
    /**
     * 与设备配对 参考源码：platform/packages/apps/Settings.git
     * /Settings/src/com/android/settings/bluetooth/CachedBluetoothDevice.java
     */
    static public boolean createBond(Class btClass, BluetoothDevice btDevice) throws Exception {
        Method createBondMethod = btClass.getMethod("createBond");
        Boolean returnValue = (Boolean) createBondMethod.invoke(btDevice);
        return returnValue.booleanValue();
    }

    /**
     * 与设备解除配对 参考源码：platform/packages/apps/Settings.git
     * /Settings/src/com/android/settings/bluetooth/CachedBluetoothDevice.java
     */
    static public boolean removeBond(Class<?> btClass, BluetoothDevice btDevice) throws Exception {
        Method removeBondMethod = btClass.getMethod("removeBond");
        Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice);
        return returnValue.booleanValue();
    }

    static public boolean setPin(Class<? extends BluetoothDevice> btClass, BluetoothDevice btDevice, String str) throws Exception {
        try {
            Method removeBondMethod = btClass.getDeclaredMethod("setPin", new Class[]{byte[].class});
            Boolean returnValue = (Boolean) removeBondMethod.invoke(btDevice,
                    new Object[]
                            {str.getBytes()});
            Log.e("returnValue", "" + returnValue);
        } catch (SecurityException e) {
            // throw new RuntimeException(e.getMessage());
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // throw new RuntimeException(e.getMessage());
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return true;

    }

    // 取消用户输入
    static public boolean cancelPairingUserInput(Class<?> btClass, BluetoothDevice device) throws Exception {
        Method createBondMethod = btClass.getMethod("cancelPairingUserInput");
//        cancelBondProcess(btClass, device);
        Boolean returnValue = (Boolean) createBondMethod.invoke(device);
        return returnValue.booleanValue();
    }

    // 取消配对
    static public boolean cancelBondProcess(Class<?> btClass, BluetoothDevice device) throws Exception {
        Method createBondMethod = btClass.getMethod("cancelBondProcess");
        Boolean returnValue = (Boolean) createBondMethod.invoke(device);
        return returnValue.booleanValue();
    }

    //确认配对

    static public void setPairingConfirmation(Class<?> btClass, BluetoothDevice device, boolean isConfirm) throws Exception {
        Method setPairingConfirmation = btClass.getDeclaredMethod("setPairingConfirmation", boolean.class);
        setPairingConfirmation.invoke(device, isConfirm);
    }


    /**
     *
     * @param clsShow
     */
    static public void printAllInform(Class clsShow) {
        try {
            // 取得所有方法
            Method[] hideMethod = clsShow.getMethods();
            int i = 0;
            for (; i < hideMethod.length; i++) {
                Log.e("method name", hideMethod[i].getName() + ";and the i is:"+ i);
            }
            // 取得所有常量
            Field[] allFields = clsShow.getFields();
            for (i = 0; i < allFields.length; i++) {
                Log.e("Field name", allFields[i].getName());
            }
        } catch (SecurityException e) {
            // throw new RuntimeException(e.getMessage());
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // throw new RuntimeException(e.getMessage());
            e.printStackTrace();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

蓝牙的连接，断开的代码我就不贴出来了，记得要加上必要的权限。
Android 6.0 一定要加上模糊定位的权限！

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

向开源者致敬!

参考博客：
http://blog.csdn.net/yi412/article/details/70208885