自Android 9開放BluetoothHidDevice功能后，Android平臺可以很簡單的通過BluetoothHidDevice模擬鍵盤鼠標等藍牙hid device角色。

Step 1：獲取BluetoothHidDevice實例

mBluetoothAdapter.getProfileProxy(ctx, mProfileServiceListener, BluetoothProfile.HID_DEVICE);

Step 2：注冊/解除注冊HID實例

public BluetoothProfile.ServiceListener mProfileServiceListener = new BluetoothProfile.ServiceListener() {@Overridepublic void onServiceDisconnected(int profile) {if (profile == BluetoothProfile.HID_DEVICE) {//解除hid device注冊mHidDevice.unregisterApp();}}@Overridepublic void onServiceConnected(int profile, BluetoothProfile proxy) {if (profile == BluetoothProfile.HID_DEVICE) {mHidDevice = (BluetoothHidDevice) proxy;//注冊hid deviceBluetoothHidDeviceAppSdpSettings sdp = new BluetoothHidDeviceAppSdpSettings(HidConfig.NAME, HidConfig.DESCRIPTION, HidConfig.PROVIDER, BluetoothHidDevice.SUBCLASS1_COMBO, HidConfig.KEYBOARD_DESCRIPTOR);mHidDevice.registerApp(sdp, null, null, Executors.newCachedThreadPool(), mCallback);}}};public final BluetoothHidDevice.Callback mCallback = new BluetoothHidDevice.Callback() {@Overridepublic void onAppStatusChanged(BluetoothDevice pluggedDevice, boolean registered) {IsRegisted = registered;}@Overridepublic void onConnectionStateChanged(BluetoothDevice device, int state) {if (state == BluetoothProfile.STATE_DISCONNECTED) {connected = false;Log.d(TAG, "hid state is disconnected");} else if (state == BluetoothProfile.STATE_CONNECTED) {connected = true;Log.d(TAG, "hid state is connected");} else if (state == BluetoothProfile.STATE_CONNECTING) {Log.d(TAG, "hid state is connecting");}}};

在獲取到BluetoothHidDevice實例后通過registerApp注冊hid device，此時hid host角色會被禁用，因此在不需要hid device功能時要及時解除hid device的注冊。

registerApp函數中最重要的一個參數BluetoothHidDeviceAppSdpSettings，主要是給對端host提供hid device角色的名稱，描述信息，供應商信息，以及Hid device的Reports Descriptor。

Hid report description描述符生成工具：USB官網HID報告描述符生成工具 - USB中文網

public class HidConfig {public final static String NAME = "My Keyboard";public final static String DESCRIPTION = "Lgd's Keyboard";public final static String PROVIDER = "Lgd";public static final byte[] KEYBOARD_DESCRIPTOR ={(byte) 0x05, (byte) 0x01, // USAGE_PAGE (Generic Desktop)(byte) 0x09, (byte) 0x06, // USAGE (Keyboard)(byte) 0xa1, (byte) 0x01, // COLLECTION (Application)(byte) 0x85, (byte) 0x02, //REPORT_ID (2)(byte) 0x05, (byte) 0x07, // USAGE_PAGE (Keyboard)(byte) 0x19, (byte) 0xe0, // USAGE_MINIMUM (Keyboard LeftControl)(byte) 0x29, (byte) 0xe7, // USAGE_MAXIMUM (Keyboard Right GUI)(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,Var,Abs)(byte) 0x95, (byte) 0x01, // REPORT_COUNT (1)(byte) 0x75, (byte) 0x08, // REPORT_SIZE (8)(byte) 0x81, (byte) 0x03, // INPUT (Cnst,Var,Abs)(byte) 0x95, (byte) 0x05, // REPORT_COUNT (5)(byte) 0x75, (byte) 0x01, // REPORT_SIZE (1)(byte) 0x05, (byte) 0x08, // USAGE_PAGE (LEDs)(byte) 0x19, (byte) 0x01, // USAGE_MINIMUM (Num Lock)(byte) 0x29, (byte) 0x05, // USAGE_MAXIMUM (Kana)(byte) 0x91, (byte) 0x02, // OUTPUT (Data,Var,Abs)(byte) 0x95, (byte) 0x01, // REPORT_COUNT (1)(byte) 0x75, (byte) 0x03, // REPORT_SIZE (3)(byte) 0x91, (byte) 0x03, // OUTPUT (Cnst,Var,Abs)(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 (Keyboard)(byte) 0x19, (byte) 0x00, // USAGE_MINIMUM (Reserved (no event indicated))(byte) 0x29, (byte) 0x65, // USAGE_MAXIMUM (Keyboard Application)(byte) 0x81, (byte) 0x00, // INPUT (Data,Ary,Abs)(byte) 0xc0 // END_COLLECTION};}

上面的描述符只是適配鍵盤，可以不定義report id，如果是多個hid功能復合的設備，例如復合鍵盤鼠標，就需要再添加鼠標的報告描述符，同時每個功能都需要有對應的report id。

0x05, 0x01, // USAGE_PAGE (Generic Desktop)

0x09, 0x02, // USAGE (Mouse)

0xa1, 0x01, // COLLECTION (Application)

0x85, 0x01, // REPORT_ID (1)

0x75, 0x10, // REPORT_SIZE (16)

0x95, 0x01, // REPORT_COUNT (1)

0x15, 0x0b, // LOGICAL_MINIMUM (11)

0x25, 0x1c, // LOGICAL_MAXIMUM (28)

0x09, 0x30, // USAGE (X)

0x81, 0x22, // INPUT (Data,Var,Abs,NPrf)

0xc0, // END_COLLECTION

0x09, 0x06, // USAGE (Keyboard)

0xa1, 0x01, // COLLECTION (Application)

0x85, 0x02, // REPORT_ID (2)

0x75, 0x08, // REPORT_SIZE (8)

0x95, 0x01, // REPORT_COUNT (1)

0x15, 0x00, // LOGICAL_MINIMUM (0)

0x25, 0x40, // LOGICAL_MAXIMUM (64)

0x09, 0x31, // USAGE (Y)

0x81, 0x02, // INPUT (Data,Var,Abs)

0xc0

Setp 4：通過sendReport想host發送按鍵信息

第二個參數是report description中定義的report id，如果沒有定義傳入0。

第三個參數是按鍵數據，根據report description，總共有8字節，前2字節是功能鍵，后6字節是對應的鍵值信息

mHidDevice.sendReport(device, 2, new byte[]{0, 0, (byte) code, 0, 0, 0, 0, 0});

Hid相關資料請參考：HID 簡介 - USB中文網

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