一、app目录下添加

implementation 'io.github.xmaihh:serialport:2.1.1'

1) 点击Sync Now更新依赖

2) AndroidManifest.xml文件添加读取设备信息权限

二、 使用

1) 创建MySerialPort.java文件

package com.youlian.weight.serialport;  import android.content.Context; import android.os.Handler; import android.os.Looper; import android.util.Log;  import java.io.IOException; import java.util.Arrays;  import tp.xmaihh.serialport.SerialHelper; import tp.xmaihh.serialport.bean.ComBean; import tp.xmaihh.serialport.utils.ByteUtil;  public class MySerialPort {     private SerialHelper serialHelper = null;     private String Tag = "MySerialPort";     private Handler handler;     private boolean isHexType = true;     private Context context;     public MySerialPort(String port, Context context){         this.context = context;         serialHelper = new SerialHelper(port, 9600) {             @Override             protected void onDataReceived(ComBean paramComBean) { //                String time = paramComBean.sRecTime;                 String rxText = new String(paramComBean.bRec);                 if (isHexType) {                     //转成十六进制数据                     rxText = ByteUtil.ByteArrToHex(paramComBean.bRec);                 } //                Log.d(Tag,"收到消息："+rxText);                 handler = new Handler(Looper.getMainLooper());                 String finalRxText = rxText;                 handler.post(new Runnable() {                     @Override                     public void run() {                         typeOperate(finalRxText);                     }                 });             }         };         serialHelper.setStopBits(1);  //设置停止位         serialHelper.setDataBits(8);  //设置数据位         serialHelper.setParity(0);      //设置校验位         serialHelper.setFlowCon(0);    //设置流控         try {             serialHelper.open();         }catch (IOException e){             Log.e(Tag,"串口打开失败");         }     }      /**      * 返回指令判断      * @param data      */     private void typeOperate(String data){         Log.d(Tag,"返回数据：" + data);     }      /**      * 发送byte[]      * @param bOutArray      */     public void sendByte(byte[] bOutArray){         Log.e(Tag,"发送byte[]："+ Arrays.toString(bOutArray));         serialHelper.send(bOutArray);     }      /**      * 发送Hex      * @param sHex      */     public void sendHex(String sHex) {         // Log.e(Tag, "发送Hex：" + sHex + ", 时间：" + getTime());         serialHelper.sendHex(sHex);     }      /**      * 发送ASCII      * @param sTxt      */     public void sendTxt(String sTxt){         Log.e(Tag,"发送ASCII："+sTxt);         serialHelper.sendTxt(sTxt);     }      /**      * 打开串口      */     public void open(){         try {             serialHelper.open();         }catch (Exception e){             Log.e(Tag,"串口打开失败");         }     }      /**      * 关闭串口      */     public void close(){         serialHelper.close();     } } 

2) 实例化

import com.you.weight.serialport.MySerialPort;  public static MySerialPort mySerialPort = null;  // /dev/ttyS3是你自己插的串口名称 mySerialPort = new MySerialPort("/dev/ttyS3", MainActivity.this);