? ? 哈羅大家好。生活總是這樣計劃趕不上變化，今天為大家分享一下新加的小功能--使用Android設備連接HID設備。

? ? 安卓內部已經內置了豐富的驅動，所以一般的設備我們只需要簡單是設置就可靈活使用。

首先對清單文件做簡單修改

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cool.wipi.myapplication" > <uses-feature android:name="android.hardware.usb.host"/> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/Theme.WiBox" > <activity android:name=".MainActivity" android:label="@string/title_activity_main" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.HOME" /> <category android:name="android.intent.category.LAUNCHER" /> <category android:name="android.intent.category.DEFAULT" /> intent-filter> <intent-filter> <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"/> intent-filter> <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/device" /> activity> application>manifest>

編寫java代碼

public class SerialFragment extends Fragment { UsbManager usbManager; HashMap deviceList; String info=""; TextView tvInfo; TextView svInfo; UsbDevice myDevice = null; UsbDeviceConnection myConnection; UsbInterface myUsbInterface; //------------------------------ UsbEndpoint writeEP,readEP; Button bt_Write,bt_read,bt; //------------------------------ byte [] writerBuf = new byte[4096]; byte [] readBuf = new byte[4096]; //----------------------------- private SerialViewModel mViewModel; public static SerialFragment newInstance() { return new SerialFragment(); } @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_serial, container, false); } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mViewModel = new ViewModelProvider(this).get(SerialViewModel.class); // TODO: Use the ViewModel tvInfo = getActivity().findViewById(R.id.tv1); svInfo = getActivity().findViewById(R.id.tv2); bt_read = getActivity().findViewById(R.id.bt_read); bt_Write = getActivity().findViewById(R.id.bt_write); bt = getActivity().findViewById(R.id.button); //------------------------------------------------ // TextView tv = (TextView) getView().findViewById(R.id.bluetooth_tv); usbManager = (UsbManager)getActivity().getApplicationContext().getSystemService(Context.USB_SERVICE); deviceList = usbManager.getDeviceList(); showInfo("find"+deviceList.size()+"device"); for (UsbDevice device:deviceList.values()){ showInfo("VID"+device.getVendorId()+"PID"+device.getProductId()); if (device.getVendorId()== 0x03C3 && device.getProductId() == 0x1F01){ myDevice = device; } if (myDevice != null && usbManager.hasPermission(myDevice)){ showInfo("hasPermission"); myConnection = usbManager.openDevice(myDevice); myUsbInterface = myDevice.getInterface(0); myConnection.claimInterface(myUsbInterface,false); int interfaceCount = myUsbInterface.getEndpointCount(); showInfo("interfaceCount"+interfaceCount); //---------------------------------------------- for(int i = 0;i if(myUsbInterface.getEndpoint(i).getDirection() == UsbConstants.USB_DIR_IN){ readEP = myUsbInterface.getEndpoint(i); }else{ writeEP = myUsbInterface.getEndpoint(i); } } }else{ showInfo("no hasPermission"); } bt_Write.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int checkSum = 0; Random rd = new Random(); for (int i = 0 ; i < 4096 ; i++){ writerBuf[i] = (byte) rd.nextInt(255); checkSum += (writerBuf[i]&0x0ff); } String firstTen = "firsTen:"; String lastTen = "lastTen:"; for(int i=0;i < 10;i++){ firstTen +=(writerBuf[i] & 0X0ff)+","; lastTen +=(writerBuf[4086+i] & 0x0ff)+","; } showInfo(firstTen); showInfo(lastTen); showInfo("sheckSum:"+checkSum); if (writeEP != null){//if (writerBuf != null){ int count = 0; count = myConnection.bulkTransfer(writeEP,writerBuf,4096,500); showInfo("BulkTranster count :" + count); } } }); bt_read.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (readEP != null){//if (writerBuf != null){ int count = 0,checkSum = 0; count = myConnection.bulkTransfer(readEP,readBuf,4096,500); showInfo("Read BulkTranster count :" + count); //--------------------- for (int i = 0 ; i < 4096 ; i++){ checkSum += (readBuf[i]&0x0ff); } String firstTen = "firsTen:"; String lastTen = "lastTen:"; for(int i=0;i < 10;i++){ firstTen +=(readBuf[i] & 0X0ff)+","; lastTen +=(readBuf[4086+i] & 0x0ff)+","; } showInfo(firstTen); showInfo(lastTen); showInfo("sheckSum:"+checkSum); showInfo("bt_read"); } } }); bt.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { showInfo("button"); } }); } } void showInfo(String str){ info += str +"\n"; tvInfo.setText(info); svInfo.setText(info); }}

運行效果

點擊查看原文了解更多www.wipi.cool

總結

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