简化版的串口通信，非常的简单，看了以后，会很简洁，很清晰，本人亲测，这个博客的例子完美运行
好吧，来看看如何使用SerialPort串口通信
1.首先我们来看一下，运行的效果图：
2.添加依赖，在app下的builder.gradle
//gogle serialPort implementation 'com.aill:AndroidSerialPort:1.0.8' 3.下发和接收数据：
package com.example.administrator.testz; import android.content.Context; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.widget.TextViewCompat; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import com.aill.androidserialport.SerialPort; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; /** * Created by jiang on 2017/12/28. */ public class SerialportTestAct extends AppCompatActivity implements View.OnClickListener { private StringBuffer seriapPortMsg = new StringBuffer(); private final String TAG = "SerialportTestAct:"; private InputStream mInputStream; private OutputStream mOutputStream; private TextView log; private EditText serMsg; private Button sendMsg; private SerialPort serialPort; private final String SERIALPORT_NO3 = "/dev/ttyS1";//串口号3 private final int BAUDRATE = 115200;//波特率 private Context mContext; //记住 我们的程序 不管客户端还是硬件端 发送和接收的指令统一使用十六进制(HEX)来表示 @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mContext = this; setContentView(R.layout.act_serialport); log = (TextView) findViewById(R.id.log); sendMsg = (Button) findViewById(R.id.sendMsg); sendMsg.setOnClickListener(this); serMsg = (EditText) findViewById(R.id.serMsg); initSerialPort(); //初始化串口设置 } @Override public void onClick(View view) { switch (view.getId()){ case R.id.sendMsg: //点击按钮向串口下发指令数据 String msg = serMsg.getText().toString().trim(); if(msg!=null&&!msg.equals("")){ //string转16进制的数据,下发的数据必须为byte数组，长度会根据协议来定 byte[] buff = fromHexString(msg); try { mOutputStream.write(buff,0,buff.length); Log.e(TAG, "下发完成"); } catch (IOException e) { e.printStackTrace(); Log.e(TAG, e.getMessage()); } } } } private void initSerialPort() { try { serialPort = new SerialPort(new File(SERIALPORT_NO3), BAUDRATE, 0); mInputStream = serialPort.getInputStream(); mOutputStream = serialPort.getOutputStream(); //这个地方为什么要开线程？ 因为这个线程是用于监听返回的数据的，必须开，一直开着 new Thread(new ReadSerialPortMsgThread()).start(); } catch (Exception e) { e.printStackTrace(); Log.e(TAG, "打开串口失败"); } } //接收硬件通过串口回应的数据 private class ReadSerialPortMsgThread implements Runnable { @Override public void run() { int size; byte buff[] = new byte[1024]; while (true) { try { if (mInputStream == null) { return; } size = mInputStream.read(buff); Log.e(TAG, "接收到串口回调w == " + size); if (size > 0) { for (int i = 0; i < size; i++) { Log.e("TAG", "十进制=" + buff[i]); final String res = hexToDecimal(buff[i]); log.post(new Runnable() { @Override public void run() { // editIn.append(text) log.append("" + res); } }); } } } catch (Exception e) { e.printStackTrace(); } finally { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } } } //十进制转16进制 private String hexToDecimal(byte oneByte) { String str = ""; int h = (oneByte >>> 4) & 0xF; int l = oneByte & 0xF; char ch = (char) ((h < 10) ? ('0' + h) : ('A' + h - 10)); char cl = (char) ((l < 10) ? ('0' + l) : ('A' + l - 10)); str = ""; str += ch; str += cl; return str; } /** * 16进制字符串转换成字节数组。 * <p> * param hex 16进制字符串 *这个协议是 还的重订 * @return 字节数组 */ private byte[] hexStringToByte(String hex) { if (hex == null || hex.equals("")) return null; String[] arry = hex.split(" "); byte[] data = new byte[arry.length]; try { for (int i = 0; i < arry.length; i++) { //这个地方在定协议 if (arry[i].length() > 2) return null; int d = Integer.parseInt(arry[i], 16); data[i] = (byte) (d & 0xff); } } catch (Exception e) { return null; } return data; } public static byte[] fromHexString(String hexString) { if (null == hexString || "".equals(hexString.trim())) { return new byte[0]; } byte[] bytes = new byte[hexString.length() / 2]; // 16进制字符串 String hex; for (int i = 0; i < hexString.length() / 2; i++) { // 每次截取2位 hex = hexString.substring(i * 2, i * 2 + 2); // 16进制-->十进制 bytes[i] = (byte) Integer.parseInt(hex, 16); } return bytes; } } 4.贴一下布局吧，仅仅一个类，就解决串口数据通信的下发和接收问题，到这里基本就结束了
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="30dp"> <TextView android:layout_width="match_parent" android:layout_height="30dp" android:text="串口接收数据：" android:textSize="20sp" /> <TextView android:id="@+id/log" android:layout_width="match_parent" android:layout_height="80dp" android:background="@color/colorAccent" /> <TextView android:layout_width="match_parent" android:layout_height="30dp" android:layout_marginTop="30dp" android:text="串口发送数据：" android:textSize="20sp" /> <EditText android:id="@+id/serMsg" android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="输入下发的值" /> <Button android:id="@+id/sendMsg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:text="发送串口信息" /> </LinearLayout> 文章来源: https://blog.csdn.net/cf8833/article/details/91885884