Android串口通信可以实现设备与设备之间通过设备线连接进行数据（消息）传递
（一）导入so库
（二）在moudle的build中添加jniLibs
buildTypes { sourceSets { main { jni.srcDirs = [] } } }12345 （三）添加Google的SerialPort
添加的是Google的所以必须创建android_serialport_api包
如需要更改SerialPort、SerialPortFinder位置需要重新生成so库
（四）创建串口通信工具类SerialPortUtils
package com.demo.serialport;import android.util.Log;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import android_serialport_api.SerialPort;public class SerialPortUtils { private final String TAG = "SerialPortUtils";// private String path = "/dev/ttyS1";// private int baudrate = 9600; public boolean serialPortStatus = false; //是否打开串口标志 public String data_; public boolean threadStatus; //线程状态，为了安全终止线程 public SerialPort serialPort = null; public InputStream inputStream = null; public OutputStream outputStream = null; public ChangeTool changeTool = new ChangeTool(); public SerialPort openSerialPort(String path,int baudrate){ try { serialPort = new SerialPort(new File(path),baudrate,0); this.serialPortStatus = true; threadStatus = false; //线程状态 //获取打开的串口中的输入输出流，以便于串口数据的收发 inputStream = serialPort.getInputStream(); outputStream = serialPort.getOutputStream(); new ReadThread().start(); //开始线程监控是否有数据要接收 } catch (IOException e) { Log.e(TAG, "openSerialPort: 打开串口异常：" + e.toString()); return serialPort; } Log.d(TAG, "openSerialPort: 打开串口"); return serialPort; } public void closeSerialPort(){ try { inputStream.close(); outputStream.close(); this.serialPortStatus = false; this.threadStatus = true; //线程状态 serialPort.close(); } catch (IOException e) { Log.e(TAG, "closeSerialPort: 关闭串口异常："+e.toString()); return; } Log.d(TAG, "closeSerialPort: 关闭串口成功"); } public void sendSerialPort(String data){ Log.d(TAG, "sendSerialPort: 发送数据"); try { byte[] sendData = data.getBytes(); //string转byte[] this.data_ = new String(sendData); //byte[]转string if (sendData.length > 0) { outputStream.write(sendData); outputStream.write(\'n\'); //outputStream.write(\'r\'+\'n\'); outputStream.flush(); Log.d(TAG, "sendSerialPort: 串口数据发送成功"); } } catch (IOException e) { Log.e(TAG, "sendSerialPort: 串口数据发送失败："+e.toString()); } } private class ReadThread extends Thread{ @Override public void run() { super.run(); //判断进程是否在运行，更安全的结束进程 while (!threadStatus){ Log.d(TAG, "进入线程run"); //64 1024 byte[] buffer = new byte[64]; int size; //读取数据的大小 try { size = inputStream.read(buffer); if (size > 0){ Log.d(TAG, "run: 接收到了数据：" + changeTool.ByteArrToHex(buffer)); Log.d(TAG, "run: 接收到了数据大小：" + String.valueOf(size)); onDataReceiveListener.onDataReceive(buffer,size); } } catch (IOException e) { Log.e(TAG, "run: 数据读取异常：" +e.toString()); } } } } //数据回调 public onDataReceiveListener onDataReceiveListener = null; public static interface onDataReceiveListener { public void onDataReceive(byte[] buffer, int size); } public void setonDataReceiveListener(onDataReceiveListener dataReceiveListener) { onDataReceiveListener = dataReceiveListener; }}123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131 package com.demo.serialport;public class ChangeTool { public String ByteArrToHex(byte[] bytes) { String strHex; StringBuilder sb = new StringBuilder(); for (byte aByte : bytes) { strHex = Integer.toHexString(aByte & 0xFF); sb.append(" ").append((strHex.length() == 1) ? "0" : "").append(strHex); // 每个字节由两个字符表示，位数不够，高位补0 } return sb.toString().trim(); } public static int byteToInt(byte b) { int x = b & 0xff; if (x == 127) { return 0; } return x; }}123456789101112131415161718192021222324252627282930313233343536373839 package com.demo.serialport;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.EditText;import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity implements View.onClickListener { private EditText mMessage; private Button mOpen; private Button mSend; private Button mClose; private SerialPortUtils serialPortUtils; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); init(); //串口数据监听事件 serialPortUtils.setonDataReceiveListener(new SerialPortUtils.onDataReceiveListener() { @Override public void onDataReceive(byte[] buffer, int size) { Log.d("TAG", "进入数据监听事件中。。。" + new String(buffer)); } }); } private void init() { initView(); serialPortUtils = new SerialPortUtils(); } private void initView() { mMessage = (EditText) findViewById(R.id.message); mOpen = (Button) findViewById(R.id.open); mOpen.setonClickListener(this); mSend = (Button) findViewById(R.id.send); mSend.setonClickListener(this); mClose = (Button) findViewById(R.id.close); mClose.setonClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.open: // TODO 20/12/28 serialPortUtils.openSerialPort("/dev/ttyS9",9600); break; case R.id.send: // TODO 20/12/28 serialPortUtils.sendSerialPort(mSend.getText().toString()); break; case R.id.close: serialPortUtils.closeSerialPort(); // TODO 20/12/28 break; default: break; } }}1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374 Demo——github地址
