Android 串口通信

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
Android 串口通信_第1张图片
（二）在moudle的build中添加jniLibs

buildTypes {             sourceSets {                 main {      jni.srcDirs = [] }        }    }

（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
Android 串口通信_第2张图片

（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;/** * @author renquan */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();    /**     * 打开串口     * @return serialPort串口对象     */    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;    }    /**     * 关闭串口     */    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");    }    /**     * 发送串口指令（字符串）     * @param data String数据指令     */    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());        }    }    /**     * 单开一线程，来读数据     */    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;    }}

package com.demo.serialport;/** * @author renquan */public class ChangeTool {         /**     * byte数组转16进制字符串     *     * @param bytes byte数组     * @return 16进制字符串     */    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();    }    /**     * byte字节转int     *     * @param b byte字节     * @return int     */    public static int byteToInt(byte b) {             int x = b & 0xff;        if (x == 127) {                 return 0;        }        return x;    }}

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;/** * @author renquan */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;        }    }}

Demo——github地址

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