返回> 网站首页
[转]Android(安卓)系统USB-OTG-HID外设通讯开发
yoours2015-03-06 18:02:55
简介一边听听音乐,一边写写文章。
google官方文档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 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) |
文章评论
1865人参与,0条评论