Android Studio USB串口通信

概要

最近突然要Android环境中串口通信

流程

1:获取USB中的File名称
2:连接
3:发送数据
4:接受数据

技术名词解释

例如：

• 波特
• 端口
• GPT-2
• GPT-3
• ChatGPT

技代码

• API
• 支持模型类型
  1:添加依赖

implementation 'com.licheedev:android-serialport:2.1.3'

2：获取所有的串口

 Vector<File> mDevices = null;public List<File> devFile=new ArrayList<>();//----------------------
if (mDevices == null) {mDevices = new Vector<File>();File dev = new File("/dev");File[] files = dev.listFiles();if (files != null) {vint i;for (i = 0; i < files.length; i++) {if (files[i].getAbsolutePath().startsWith(mDeviceRoot)) {Log.v(TAG, "device: " + files[i]);devFile.add(files[i]);mDevices.add(files[i]);}}}}

2：连接

import com.nfgk.xx.usb.utils.ByteUtil;import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class SerialHelper {private static final String TAG="SerialHelper";private SerialPort mSeriaPort;private OutputStream mOutputStream;private InputStream mInputStream;private ReadThread mReadThread;// 打开串口public boolean open(String devicePath, int baudRate) {// 1. 检查设备节点是否存在File device = new File(devicePath);if (!device.exists()) {Log.e(TAG, "device is null：" + devicePath);return false;}try {//  打开串口（参数：设备、波特率、校验位等）// 第三个参数：0表示无校验，1表示奇校验，2表示偶校验mSeriaPort = new SerialPort(device, baudRate); //8, 0, 1, 0// 获取读写流mOutputStream = mSeriaPort.getOutputStream();mInputStream = mSeriaPort.getInputStream();mReadThread = new ReadThread();mReadThread.start();return true;} catch (IOException e) {Log.e(TAG, device+" open：" + e.getMessage());return false;}}private class ReadThread extends Thread {@Overridepublic void run() {super.run();byte[] buffer = new byte[1024]; int bytes;while (!isInterrupted() && mInputStream != null) {try {bytes = mInputStream.read(buffer);if (bytes > 0) {byte[] data = new byte[bytes];System.arraycopy(buffer, 0, data, 0, bytes);onDataReceived(data);}} catch (IOException e) {Log.e(TAG, "error：" + e.getMessage());break;}}}}// 数据接收回调（需在主线程处理）private void onDataReceived(byte[] data) {// 示例：转换为十六进制字符串String hexData = bytesToHex(data);Log.d(TAG, "收到数据：" + hexData);// 通知UI更新（可通过Handler或接口回调）}// 字节数组转十六进制字符串（便于调试）private String bytesToHex(byte[] bytes) {StringBuilder sb = new StringBuilder();for (byte b : bytes) {String hex = String.format("%02X ", b);sb.append(hex);}return sb.toString();}public void send(byte[] bOutArray) {try {if(mOutputStream==null){Log.v(TAG,"mOutputStream is null");return;}this.mOutputStream.write(bOutArray);} catch (IOException e) {e.printStackTrace();}}public void sendHex(String sHex) {byte[] outArray = ByteUtil.HexToByteArr(sHex);send(outArray);}public void sendTxt(String txt) {byte[] outArray = txt.getBytes();send(outArray);}

public class ByteUtil {public static int isOdd(int num) {return num & 0x1;}public static int HexToInt(String inHex) {return Integer.parseInt(inHex, 16);}public static byte HexToByte(String inHex) {return (byte) Integer.parseInt(inHex, 16);}public static String Byte2Hex(Byte inByte) {return String.format("%02x", new Object[]{inByte}).toUpperCase();}public static String ByteArrToHex(byte[] inBytArr) {StringBuilder strBuilder = new StringBuilder();int j = inBytArr.length;for (int i = 0; i < j; i++) {strBuilder.append(Byte2Hex(Byte.valueOf(inBytArr[i])));strBuilder.append("");}return strBuilder.toString();}public static String ByteArrToHex(byte[] inBytArr, int offset, int byteCount) {StringBuilder strBuilder = new StringBuilder();int j = byteCount;for (int i = offset; i < j; i++) {strBuilder.append(Byte2Hex(Byte.valueOf(inBytArr[i])));}return strBuilder.toString();}public static byte[] HexToByteArr(String inHex) {int hexlen = inHex.length();byte[] result;if (isOdd(hexlen) == 1) {hexlen++;result = new byte[hexlen / 2];inHex = "0" + inHex;} else {result = new byte[hexlen / 2];}int j = 0;for (int i = 0; i < hexlen; i += 2) {result[j] = HexToByte(inHex.substring(i, i + 2));j++;}return result;}
}

 serialHelper=new SerialHelper();String fileUsb=devFile;//"/dev/xxx"
boolean op= serialHelper.open(fileUsb,9600);
if(op)serialHelper.sendTxt("#0000");

小结

先上传代码