Android(安卓)系统USB-OTG-HID外设通讯开发

还在百度Google导出搜索如何进行USB接口的HID进行开发吗？网站上很多文章并不完善，这方便的也介绍的不多，我看了很多资料，借助网上的一些代码，整理了以下信息，希望能给大家提供便捷

首先请大家仔细看看Google官方并不详细的SDK文档http://developer.android.com/guide/topics/connectivity/usb/host.html

Android系统3.1及以上版本才能支持USBHOST，这样我们才能连接HID设备进行通讯

项目新建完成之后，AndroidManifest.xml中加入以下代码

然后res下增加xml文件夹，新建device_filter.xml，并加入一下代码，这里是声明HID设备VID以及PID，注意是10进制

下面就是java代码了，直接贴完整代码吧

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.missilelauncher;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbRequest;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MissileLauncherActivity extends Activity {

	private static final String TAG = "MissileLauncherActivity";

	private Button btsend; // 发送按钮
	private UsbManager manager; // USB管理器
	private UsbDevice mUsbDevice; // 找到的USB设备
	private ListView lsv1; // 显示USB信息的
	private UsbInterface mInterface;
	private UsbDeviceConnection mDeviceConnection;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.launcher);

		btsend = (Button) findViewById(R.id.btsend);
		btsend.setOnClickListener(btsendListener);

		lsv1 = (ListView) findViewById(R.id.lsv1);

		// 获取USB设备
		manager = (UsbManager) getSystemService(Context.USB_SERVICE);
		if (manager == null) {
			return;
		} else {
			Log.i(TAG, "usb设备：" + String.valueOf(manager.toString()));
		}
		HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
		Log.i(TAG, "usb设备：" + String.valueOf(deviceList.size()));
		Iterator<UsbDevice> deviceIterator = deviceList.values().iterator();
		ArrayList<String> USBDeviceList = new ArrayList<String>(); // 存放USB设备的数量
		while (deviceIterator.hasNext()) {
			UsbDevice device = deviceIterator.next();

			USBDeviceList.add(String.valueOf(device.getVendorId()));
			USBDeviceList.add(String.valueOf(device.getProductId()));

			// 在这里添加处理设备的代码
			if (device.getVendorId() == 6790 && device.getProductId() == 57360) {
				mUsbDevice = device;
				Log.i(TAG, "找到设备");
			}
		}
		// 创建一个ArrayAdapter
		lsv1.setAdapter(new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, USBDeviceList));
		findIntfAndEpt();
	}

	// 寻找接口和分配结点
	private void findIntfAndEpt() {
		if (mUsbDevice == null) {
			Log.i(TAG, "没有找到设备");
			return;
		}
		for (int i = 0; i < mUsbDevice.getInterfaceCount();) {
			// 获取设备接口，一般都是一个接口，你可以打印getInterfaceCount()方法查看接
			// 口的个数，在这个接口上有两个端点，OUT 和 IN
			UsbInterface intf = mUsbDevice.getInterface(i);
			Log.d(TAG, i + " " + intf);
			mInterface = intf;
			break;
		}

		if (mInterface != null) {
			UsbDeviceConnection connection = null;
			// 判断是否有权限
			if (manager.hasPermission(mUsbDevice)) {
				// 打开设备，获取 UsbDeviceConnection 对象，连接设备，用于后面的通讯
				connection = manager.openDevice(mUsbDevice);
				if (connection == null) {
					return;
				}
				if (connection.claimInterface(mInterface, true)) {
					Log.i(TAG, "找到接口");
					mDeviceConnection = connection;
					// 用UsbDeviceConnection 与 UsbInterface 进行端点设置和通讯
					getEndpoint(mDeviceConnection, mInterface);
				} else {
					connection.close();
				}
			} else {
				Log.i(TAG, "没有权限");
			}
		} else {
			Log.i(TAG, "没有找到接口");
		}
	}

	private UsbEndpoint epOut;
	private UsbEndpoint epIn;

	// 用UsbDeviceConnection 与 UsbInterface 进行端点设置和通讯
	private void getEndpoint(UsbDeviceConnection connection, UsbInterface intf) {
		if (intf.getEndpoint(1) != null) {
			epOut = intf.getEndpoint(1);
		}
		if (intf.getEndpoint(0) != null) {
			epIn = intf.getEndpoint(0);
		}
	}

	private byte[] Sendbytes; // 发送信息字节
	private byte[] Receiveytes; // 接收信息字节
	private OnClickListener btsendListener = new OnClickListener() {
		int ret = -100;

		@Override
		public void onClick(View v) {
			String testString = "010A";
			//String testString = "C783CC30";
			byte[] bt = clsPublic.HexString2Bytes(testString);

			Sendbytes = Arrays.copyOf(bt, bt.length);

			// 1,发送准备命令
			ret = mDeviceConnection.bulkTransfer(epOut, Sendbytes,
					Sendbytes.length, 5000);
			Log.i(TAG, "已经发送!");

			// 2,接收发送成功信息
			Receiveytes = new byte[32];
			ret = mDeviceConnection.bulkTransfer(epIn, Receiveytes,
					Receiveytes.length, 10000);
			Log.i(TAG, "接收返回值:" + String.valueOf(ret));
			if (ret != 32) {
				DisplayToast("接收返回值" + String.valueOf(ret));
				return;
			} else {
				// 查看返回值
				DisplayToast(clsPublic.Bytes2HexString(Receiveytes));
				Log.i(TAG, clsPublic.Bytes2HexString(Receiveytes));
			}
		}
	};

	public void DisplayToast(CharSequence str) {
		Toast toast = Toast.makeText(this, str, Toast.LENGTH_LONG);
		// 设置Toast显示的位置
		toast.setGravity(Gravity.TOP, 0, 200);
		// 显示Toast
		toast.show();
	}

}

这里还有一个需要解决的问题就是如何设置输入输出报文，函数是controlTransfer(requestType, request, value, index, buffer, length, timeout)

但是始终没有弄清楚参数如何传递，还望高手相助