Android(安卓)系统USB-OTG-HID外设通讯开发

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();
    }
}