Android 编程连接HID设备
时间: 2023-09-17 19:12:16 浏览: 77
在 Android 编程中连接 HID 设备,需要使用 USB Host API。以下是一个简单的示例代码,可以帮助你开始:
```java
public class MainActivity extends AppCompatActivity {
private static final String TAG = "HID Demo";
private static final int VID = 0x1234; // Vendor ID of your HID device
private static final int PID = 0x5678; // Product ID of your HID device
private UsbManager mUsbManager;
private UsbDevice mDevice;
private UsbDeviceConnection mConnection;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
// Find the HID device by vendor ID and product ID
for (UsbDevice device : mUsbManager.getDeviceList().values()) {
if (device.getVendorId() == VID && device.getProductId() == PID) {
mDevice = device;
break;
}
}
if (mDevice == null) {
Log.e(TAG, "HID device not found!");
return;
}
// Request permission to access the HID device
PendingIntent permissionIntent = PendingIntent.getBroadcast(this, 0, new Intent("com.example.hid.USB_PERMISSION"), 0);
mUsbManager.requestPermission(mDevice, permissionIntent);
// Open the HID device connection
mConnection = mUsbManager.openDevice(mDevice);
if (mConnection == null) {
Log.e(TAG, "Failed to open HID device!");
return;
}
// Claim the HID interface
UsbInterface intf = mDevice.getInterface(0);
mConnection.claimInterface(intf, true);
// Start reading input reports from the HID device
byte[] buffer = new byte[intf.getEndpoint(0).getMaxPacketSize()];
UsbRequest request = new UsbRequest();
request.initialize(mConnection, intf.getEndpoint(0));
request.queue(buffer, buffer.length);
while (true) {
UsbRequest response = mConnection.requestWait();
if (response != null && response.getEndpoint() == intf.getEndpoint(0)) {
Log.i(TAG, "Received HID input report: " + Arrays.toString(buffer));
request.queue(buffer, buffer.length);
}
}
}
}
```
在这个示例代码中,我们首先使用 USB Host API 找到 HID 设备,然后请求访问权限、打开设备连接、声明接口,并开始读取输入报告。你需要根据你的 HID 设备的 VID 和 PID 更新代码中的常量。注意,这个示例仅仅是一个起步示例,你需要根据你的具体需求进行更多的定制和调整。
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