android 手机通过usb数据线与OTG设备通信

1.首先在AndroidManifest.xml文件中添加所需要的权限

2.然后在AndroidManifest.xml文件中的activity下添加以下代码

3.新建device_filter.xml文件夹

product-id="123"vendor-id="1234" />

4.在onCreate方法中初始化连接设备的一些配置，注册广播接收设备断开与连接的广播

public static final String ACTION_USB_PERMISSION = "com.test.otg.USB_PERMISSION";
@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//获取 USB 管理器usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);pendingIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);registerBrasdcast();initUsb();initView();
}

//初始化设备

private void initUsb() {try { //取连接到设备上的 USB 设备集合HashMap map = usbManager.getDeviceList();//遍历集合取指定的 USB 设备for (UsbDevice device : map.values()) {Log.i("device", "vid:" + device.getVendorId() + "   pid:" + device.getProductId() + "   " + device.getDeviceName());if (1234== device.getVendorId() && 123== device.getProductId()) {usbDevice = device;if (usbManager.hasPermission(usbDevice)) {usbManager.requestPermission(device, pendingIntent);}getDeviceInterface();//获取接口assignEndpoint(Interface2);// 分配端点openDevice(Interface2);//打开设备}}if (usbDevice == null) {Log.e("TAG", "没有获取到设备");return;}} catch (Exception e) {e.printStackTrace();toast("设备获取异常");}
}

// 寻找设备接口
private void getDeviceInterface() {if (usbDevice != null) {Log.i("TAG", "interfaceCounts : " + usbDevice.getInterfaceCount());for (int i = 0; i < usbDevice.getInterfaceCount(); i++) {UsbInterface intf = usbDevice.getInterface(i);if (i == 0) {Interface1 = intf; // 保存设备接口Log.i("TAG", "成功获得设备接口:" + Interface1.getId());}if (i == 1) {Interface2 = intf;Log.i("TAG", "成功获得设备接口:" + Interface2.getId());}}} else {Log.e("TAG", "未连接设备！");}
}

// 分配端点，IN /OUT，即输入输出；
private UsbEndpoint assignEndpoint(UsbInterface mInterface) {for (int i = 0; i < mInterface.getEndpointCount(); i++) {UsbEndpoint ep = mInterface.getEndpoint(i);if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {if (ep.getDirection() == UsbConstants.USB_DIR_OUT) {epBulkOut = ep;} else {epBulkIn = ep;}}if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_CONTROL) {epControl = ep;}if (ep.getType() == UsbConstants.USB_ENDPOINT_XFER_INT) {if (ep.getDirection() == UsbConstants.USB_DIR_OUT) {epIntEndpointOut = ep;}if (ep.getDirection() == UsbConstants.USB_DIR_IN) {epIntEndpointIn = ep;}}}if (epBulkOut == null && epBulkIn == null && epControl == null&& epIntEndpointOut == null && epIntEndpointIn == null) {throw new IllegalArgumentException("not endpoint is founded!");}return epIntEndpointIn;
}

// 打开设备
public void openDevice(UsbInterface mInterface) {if (mInterface != null) {UsbDeviceConnection conn = null;// 在open前判断是否有连接权限；对于连接权限可以静态分配，也可以动态分配权限if (usbManager.hasPermission(usbDevice)) {conn = usbManager.openDevice(usbDevice);} else {usbManager.requestPermission(usbDevice, pendingIntent);}if (conn == null) {return;}if (conn.claimInterface(mInterface, true)) {myDeviceConnection = conn;// 到此你的android设备已经连上otg设备if (myDeviceConnection != null)System.out.println("打开设备成功！");} else {System.out.println("无法打开连接通道。");conn.close();}}
}

//广播注册
private void registerBrasdcast() {//注册权限广播IntentFilter usbFilter = new IntentFilter(ACTION_USB_PERMISSION);//usb 插入广播usbFilter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);//usb 拔出广播usbFilter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);registerReceiver(mUsbReceiver, usbFilter);
}

//广播接收
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {Log.e("TAG", intent.getAction());switch (intent.getAction()) {case UsbManager.ACTION_USB_DEVICE_ATTACHED:toast("设备插入");initUsb();//初始化设备break;case UsbManager.ACTION_USB_DEVICE_DETACHED:toast("设备断开");break;case ACTION_USB_PERMISSION:synchronized (this) {UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {if (device != null) {openDevice(Interface2);}} else {Toast.makeText(MainActivity.this, "用户拒绝了USB的权限！", Toast.LENGTH_LONG).show();return;}}break;}}
};

5.发送与接收数据

//发送数据
@Override
public void onClick(View v) {switch (v.getId()) {
if (myDeviceConnection == null) {toast("设备未连接或未授权!");return;
}
// 发送准备命令
int reto = myDeviceConnection.bulkTransfer(epBulkOut, openDate, openDate.length, 5000);
if (reto != -1) {Log.i("TAG", "已经发送数据" + reto);Message openMsg = Message.obtain();openMsg.what = SEND_DAT;mHandler.sendMessage(openMsg);}}
}

//接收数据
private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case SEND_DATA:
byte[] receiverDate= new byte[20];
int rets = myDeviceConnection.bulkTransfer(epBulkIn, receiverDate, 20, 5000);
if(rets!=-1){
//处理收到的receiverDate数组，16进制的
}}}
};

6.解除广播

@Override
protected void onDestroy() {super.onDestroy();unregisterReceiver(mUsbReceiver);
}

AndroidManifest.xml的activity中没有加上这段代码，连接时总是会弹出允许设备的窗口，点默认也没有用。

网上说可以改源码，我对源码进行修改后也不起作用，暂时不知道怎么去掉USB的权限允许窗。

本文来自互联网用户投稿，文章观点仅代表作者本人，不代表本站立场，不承担相关法律责任。如若转载，请注明出处。 如若内容造成侵权/违法违规/事实不符，请点击【内容举报】进行投诉反馈！