Android模拟蓝牙蓝牙键盘——适配Android和Windows
学校寒假有个程序设计比赛，我也一直想要去写一个安卓模拟的蓝牙键盘，这样无论到哪里，比如班班通和没有键盘的电脑设备，有手机就可以操作它，也比USB方便一些。忙活了一个寒假，也走了不少歪路，终于整成了，下面分享一些经验。
（学校的软件设计比赛已经交了终稿了，我的仓库开源在Gitee和GitHub，求求star：
Gitee：https://gitee.com/FengyunTHU/keyboard
GitHub：https://github.com/FengyunTHU/keyboardOFbluetooth）
自己在写代码的过程中也参考了很多CSDN博客，列举如下：
蓝牙HID——将android设备变成蓝牙键盘（BluetoothHidDevice）
仅通过蓝牙HID将安卓手机模拟成鼠标和键盘
使用旧手检做成蓝牙键盘
CSDN上大佬真的很多！
代码思路
①第一步是蓝牙HID的初始化
在安卓API28后开放了BluetoothHidDevice类，主要就是用它来完成。首先是注册HID服务：
mBtAdapter.getProfileProxy(context, new BluetoothProfile.ServiceListener() {
@Override
public void onServiceConnected(int profile, BluetoothProfile proxy) {
Log.d(TAG, "onServiceConnected: " + profile);
Toast.makeText(context, "Okk_connected_service", Toast.LENGTH_SHORT).show();
if (profile == BluetoothProfile.HID_DEVICE) {
Log.d(TAG, "Proxy received but it isn't hid_OUT");
if (!(proxy instanceof BluetoothHidDevice)) {
Log.e(TAG, "Proxy received but it isn't hid");
return;
}
Log.d(TAG,"Connecting HID…");
mHidDevice = (BluetoothHidDevice) proxy;
Log.d(TAG, "proxyOK");
BluetoothHidDeviceAppSdpSettings Sdpsettings = new BluetoothHidDeviceAppSdpSettings(
HidConfig.KEYBOARD_NAME,
HidConfig.DESCRIPTION,
HidConfig.PROVIDER,
BluetoothHidDevice.SUBCLASS1_KEYBOARD,
HidConfig.KEYBOARD_COMBO
);
if (mHidDevice != null) {
Toast.makeText(context, "OK for HID profile", Toast.LENGTH_SHORT).show();
Log.d(TAG, "HID_OK");
Log.d(TAG, "Get in register");
//getPermission();
// 创建一个BluetoothHidDeviceAppSdpSettings对象
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
Log.d(TAG,"return before register");
String[] list = new String[] {
Manifest.permission.BLUETOOTH_SCAN,
Manifest.permission.BLUETOOTH_CONNECT
};
requestPermissions(activity,list,1);
return;
}
BluetoothHidDeviceAppQosSettings inQos = new BluetoothHidDeviceAppQosSettings(
BluetoothHidDeviceAppQosSettings.SERVICE_GUARANTEED, 200, 2, 200,
10000 /* 10 ms */, 10000 /* 10 ms */);
BluetoothHidDeviceAppQosSettings outQos = new BluetoothHidDeviceAppQosSettings(
BluetoothHidDeviceAppQosSettings.SERVICE_GUARANTEED, 900, 9, 900,
10000 /* 10 ms */, 10000 /* 10 ms */);
mHidDevice.registerApp(Sdpsettings, null, null, Executors.newCachedThreadPool(), mCallback);
// registerApp();// 注册
} else {
Toast.makeText(context, "Disable for HID profile", Toast.LENGTH_SHORT).show();
}
// 启用设备发现
// requestLauncher.launch(new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE));
Log.d(TAG, "Discover");
}
}
@SuppressLint("MissingPermission")
@Override
public void onServiceDisconnected(int profile) {// 断开连接
if (profile == BluetoothProfile.HID_DEVICE) {
Log.d(TAG, "Unexpected Disconnected: " + profile);
mHidDevice = null;
mHidDevice.unregisterApp();
}
}
}, BluetoothProfile.HID_DEVICE);
}
public final BluetoothHidDevice.Callback mCallback = new BluetoothHidDevice.Callback() {
private final int[] mMatchingStates = new int[]{
BluetoothProfile.STATE_DISCONNECTED,
BluetoothProfile.STATE_CONNECTING,
BluetoothProfile.STATE_CONNECTED
};
@Override
public void onAppStatusChanged(BluetoothDevice pluggedDevice, boolean registered) {
Log.d(TAG, "ccccc_str");
if (ActivityCompat.checkSelfPermission(context, android.Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
return;
}
Log.d(TAG, "onAppStatusChanged: " + (pluggedDevice != null ? pluggedDevice.getName() : "null") + "registered:" + registered);
// Toast.makeText(context, "onAppStatusChanged", Toast.LENGTH_SHORT).show();
IsRegisted = registered;
if (registered) {
// 应用已注册
Log.d(TAG, "register OK!.......");
// List matchingDevices = mHidDevice.getDevicesMatchingConnectionStates(mMatchingStates);
// Log.d(TAG, "paired devices: " + matchingDevices + " " + mHidDevice.getConnectionState(pluggedDevice));
// Toast.makeText(context, "paired devices: " + matchingDevices + " " + mHidDevice.getConnectionState(pluggedDevice), Toast.LENGTH_SHORT).show();
// if (pluggedDevice != null && mHidDevice.getConnectionState(pluggedDevice) != BluetoothProfile.STATE_CONNECTED) {
// boolean result = mHidDevice.connect(pluggedDevice);// pluggedDevice即为连接到模拟HID的设备
// Log.d(TAG, "hidDevice connect:" + result);
// Toast.makeText(context, "hidDevice connect:" + result, Toast.LENGTH_SHORT).show();
// } else if (matchingDevices != null && matchingDevices.size() > 0) {
// // 选择连接的设备
// mHostDevice = matchingDevices.get(0);// 获得第一个已经配对过的设备
// Toast.makeText(context, "device_is_ok: " + mHostDevice.getName() + mHostDevice.getAddress(), Toast.LENGTH_SHORT).show();
// } else {
// // 注册成功未配对
// }
}
// } else {
// // 应用未注册
// }
}
@Override
public void onConnectionStateChanged(BluetoothDevice device, int state) {
Log.d(TAG, "onConnectStateChanged:" + device + " state:" + state);
// Toast.makeText(context, state, Toast.LENGTH_SHORT).show();
if (state == BluetoothProfile.STATE_CONNECTED) {// 已经连接了
connected = true;
mHostDevice = device;
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
return;
}
Log.d(TAG,"hid state is connected");
Log.d(TAG,"-----------------------------------connected HID");
Log.d(TAG,device.getName().toString());
// Toast.makeText(context, "device_is_ok: " + mHostDevice.getName() + mHostDevice.getAddress(), Toast.LENGTH_SHORT).show();
} else if (state == BluetoothProfile.STATE_DISCONNECTED) {
connected = false;
Log.d(TAG,"hid state is disconnected");
// mHostDevice = null;
// Toast.makeText(context, "device_is_null", Toast.LENGTH_SHORT).show();
} else if (state == BluetoothProfile.STATE_CONNECTING) {
Log.d(TAG,"hid state is connecting");
}
}
};
在mBtAdapter.getProfileProxy()中注册，其中onServiceConnected()会在开始注册时调用，其中的mHidDevice.registerApp()就是注册采用的方法，提供的SdpSettings是最主要的的HID描述，其中定义一系列常量用于描述模拟的HID设备。
进行注册时会有一个回调mCallback，onAppStatusChanged()调用在注册成功，onConnectStateChanged()则是在蓝牙连接状态改变时调用，如连接上、断开、正在连接，其中的日志可以反应蓝牙连接的状态。
注意注册HID时，蓝牙必须处于打开状态。打开蓝牙的代码我暂未编写。
②发起蓝牙连接
在发起连接上，我试了从电脑端发起连接、从手机端发起连接，而且使用的都是点进系统蓝牙列表的方式，均无法建立稳定连接。
后来看到大佬文章，解决了这个问题，即使用代理连接：
@SuppressLint("MissingPermission")
public void ConnectotherBluetooth() {
mHostDevice = mBtAdapter.getRemoteDevice("B4:8C:9D:AD:9B:9A");
if (mHostDevice!=null) {
Log.d(TAG,"Connected is OK");
Log.d(TAG,mHostDevice.getName());
}
mHidDevice.connect(mHostDevice);// 代理连接
}
只要把mac地址改成所想要连接的蓝牙设备的mac即可。电脑可以采用cmd指令ipconfig /all，拉到最底即可；手机使用adb连接后，输入指令adb shell settings get secure bluetooth_address即可。当然也可以直接扫描，但我目前还未完成相关代码。
③发送报告
@JavascriptInterface
@SuppressLint("MissingPermission")
public void sendKey(String key) {
byte b1 = 0;
if (key.length()
char keychar = key.charAt(0);
if ((keychar=65)&&(keychar
b1 = 2;
}
}
if (keyMap.SHITBYTE.containsKey(key)) {
b1 = 2;
}
Log.d(TAG,"pre_send: "+key);
mHidDevice.sendReport(mHostDevice,8,new byte[]{
b1,0,keyMap.KEY2BYTE.get(key.toUpperCase()),0,0,0,0,0
});
mHidDevice.sendReport(mHostDevice,8,new byte[]{
0,0,0,0,0,0,0,0
});// 这是松开按键的报告
Log.d(TAG,"after_send: "+key);
}
public final static String KEYBOARD_NAME = "My Keyboard";
public final static String DESCRIPTION = "KKKey";
public final static String PROVIDER = "Alphabet";
public final static byte ID_KEYBOARD = 1;
// HID码表【不知道干啥的】
public static final byte[] KEYBOARD_COMBO =
{
(byte) 0x05, (byte) 0x01, // Usage Page (Generic Desktop)
(byte) 0x09, (byte) 0x06, // Usage (Keyboard)
(byte) 0xA1, (byte) 0x01, // Collection (Application)
(byte) 0x85, (byte) 0x08, // REPORT_ID (Keyboard)
(byte) 0x05, (byte) 0x07, // Usage Page (Key Codes)
(byte) 0x19, (byte) 0xE0, // Usage Minimum (224)
(byte) 0x29, (byte) 0xE7, // Usage Maximum (231)
(byte) 0x15, (byte) 0x00, // Logical Minimum (0)
(byte) 0x25, (byte) 0x01, // Logical Maximum (1)
(byte) 0x75, (byte) 0x01, // Report Size (1)
(byte) 0x95, (byte) 0x08, // Report Count (8)
(byte) 0x81, (byte) 0x02, // Input (Data, Variable, Absolute)
(byte) 0x95, (byte) 0x01, // Report Count (1)
(byte) 0x75, (byte) 0x08, // Report Size (8)
(byte) 0x81, (byte) 0x01, // Input (Constant) reserved byte(1)
(byte) 0x95, (byte) 0x05, // Report Count (5)
(byte) 0x75, (byte) 0x01, // Report Size (1)
(byte) 0x05, (byte) 0x08, // Usage Page (Page# for LEDs)
(byte) 0x19, (byte) 0x01, // Usage Minimum (1)
(byte) 0x29, (byte) 0x05, // Usage Maximum (5)
(byte) 0x91, (byte) 0x02, // Output (Data, Variable, Absolute), Led report
(byte) 0x95, (byte) 0x01, // Report Count (1)
(byte) 0x75, (byte) 0x03, // Report Size (3)
(byte) 0x91, (byte) 0x01, // Output (Data, Variable, Absolute), Led report padding
(byte) 0x95, (byte) 0x06, // Report Count (6)
(byte) 0x75, (byte) 0x08, // Report Size (8)
(byte) 0x15, (byte) 0x00, // Logical Minimum (0)
(byte) 0x25, (byte) 0x65, // Logical Maximum (101)
(byte) 0x05, (byte) 0x07, // Usage Page (Key codes)
(byte) 0x19, (byte) 0x00, // Usage Minimum (0)
(byte) 0x29, (byte) 0x65, // Usage Maximum (101)
(byte) 0x81, (byte) 0x00, // Input (Data, Array) Key array(6 bytes)
(byte) 0xC0 // End Collection (Application)
};
}
0,0,0,0,0,0,0,0
});// 这是松开按键的报告
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