Android串口使用方法
目录
前言
一、环境介绍
二、设备介绍
二、方法一:
1.引入库
2.编写代码
三、方法二:
1.引入库
2.编写代码
四、完整代码:
五、源码:
前言
串口是一种用于android对硬件设备通信的一种协议，可以发送某种指令控制硬件设备,也可以接受传感器发送过来的数据，比如IC/ID卡，雷达，传感器等。下面介绍串口在android开发中的2使用方式
一、环境介绍
- Android
系统版本:Android 7.1 Android 12
Android Studio Electric Eel | 2022.1.1jdk-18.0.2
- PC
Windows11
串口调试工具sscom(或者其他串口调试工具也可以)
二、设备介绍
二、方法一:
使用ARMT自带的串口api SerialPort.java
1.引入库
在build.gradle 的dependencies中添加jar包
//ARMT SDK
implementation files('libs/armtsdkapi.jar')
2.编写代码
2.1初始化串口
initSerialPort("/dev/ttyS4");
/**
* 初始化串口
*
* @param path 串口路径
*/
private void initSerialPort(String path) {
try {
uart3 = new SerialPort(path, 9600, 8, "n", 1);
} catch (IOException e) {
e.printStackTrace();
}
//获取输出流
mFileOutputStream3 = (FileOutputStream) uart3.getOutputStream();
//获取输入流
mFileInputStream3 = (FileInputStream) uart3.getInputStream();
}
2.2编写接受数据
/**
* 开机线程接收串口数据
* 收到数据后发送的Handler刷新
*/
private void readData() {
new Thread(() -> {
while (run_flag) {
int size3 = 0;
try {
size3 = mFileInputStream3.read(mRevBuffer3);
} catch (IOException e) {
e.printStackTrace();
}
if (size3 > 0) {
String str3 = new String(mRevBuffer3, 0, size3);
Log.i("串口", "receiveData() --> " + str3);
mHandler.sendMessage(mHandler.obtainMessage(1, str3));
Arrays.fill(mRevBuffer3, (byte) 0x0);
}
}
}, "串口接收线程").start();
}
这里开启线程一直读数据,读到数据后通过Handler更新到Textview
2.3发送数据
/**
* 发送串口数据
*/
private void sendData() {
try {
if (mFileOutputStream3 != null) {
mFileOutputStream3.write(mBuffer);
}
} catch (IOException e) {
e.printStackTrace();
}
}
以上就是通过ARMT提供的方法使用串口, 完整代码在最底部
三、方法二:
使用第三方库SerialPortHelper
1.引入库
在build.gradle 的dependencies中添加jar包
//串口
implementation 'com.github.maybesix:Android-XHLibrary:v1.0.0'添加maven 仓库
repositories {
maven { url 'https://jitpack.io' }
}2.编写代码
2.1初始化串口
mHelper = initSerialPortHelper("/dev/ttyS4");
这里初始化 SerialPortHelper,并且设置监听, 收到数据后通过Handler更新TextView
private SerialPortHelper initSerialPortHelper(String port) {
SerialPortHelper serialPort = new SerialPortHelper(port, 9600);
serialPort.setSerialPortReceivedListener(new SerialPortHelper.OnSerialPortReceivedListener() {
@SuppressLint("SetTextI18n")
@Override
public void onSerialPortDataReceived(ComPortData comPortData) {
String dataStr = comPortData.getRecTime() + " 收到: " + new String(comPortData.getRecData());
mHandler.sendMessage(mHandler.obtainMessage(1, dataStr));
}
});
serialPort.open();
return serialPort;
}2.2发送数据
private void sendDataHelper() {
if (mHelper != null && mHelper.isOpen()) {
mHelper.sendTxtString("我是SerialPortHelper");
}
}
2.3获取所有串口地址(通用方法)
ListallSerial = getAllSerial();
/**
* 获取所有串口
*
* @return
*/
private List getAllSerial() {
List serialPorts = new ArrayList<>();
Pattern pattern = Pattern.compile("^ttyS|^ttyUSB|^ttyACM|^ttyAMA|^rfcomm|^tty[^/]*$");
File devDirectory = new File("/dev");
File[] files = devDirectory.listFiles();
if (files != null) {
for (File file : files) {
String name = file.getName();
if (pattern.matcher(name).find()) {
serialPorts.add(file);
Log.e("串口", "扫描到的串口" + file);
}
}
}
return serialPorts;
}
四、完整代码:
package com.armt.sdktest_armt.serialPort;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.armt.sdktest_armt.R;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;
import cn.com.armt.sdk.hardware.SerialPort;
import top.maybesix.xhlibrary.serialport.ComPortData;
import top.maybesix.xhlibrary.serialport.SerialPortHelper;
public class SerialPortActivity extends AppCompatActivity {
private byte[] mRevBuffer3 = new byte[100];
private byte[] mBuffer = "12345".getBytes();//{1,2,3,4,5};
private SerialPort uart3;
private FileOutputStream mFileOutputStream3;
private FileInputStream mFileInputStream3;
private boolean run_flag = true;
private Button send;
private TextView content;
private SerialPortHelper mHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_serial_port);
send = findViewById(R.id.send);
content = findViewById(R.id.content);
//获取全部串口
List allSerial = getAllSerial();
Log.e("串口", "所有串口:" + allSerial);
//初始化串口,串口地址:"/dev/ttyS4"
initSerialPort("/dev/ttyS4");
//开启线程接收串口数据
readData();
//第二种使用串口的方式
mHelper = initSerialPortHelper("/dev/ttyS4");
//点击发送按钮
send.setOnClickListener(v -> {
//点击模拟发送数据
sendData();
// sendDataHelper();
});
}
/**
* 获取所有串口
*
* @return
*/
private List getAllSerial() {
List serialPorts = new ArrayList<>();
Pattern pattern = Pattern.compile("^ttyS|^ttyUSB|^ttyACM|^ttyAMA|^rfcomm|^tty[^/]*$");
File devDirectory = new File("/dev");
File[] files = devDirectory.listFiles();
if (files != null) {
for (File file : files) {
String name = file.getName();
if (pattern.matcher(name).find()) {
serialPorts.add(file);
Log.e("串口", "扫描到的串口" + file);
}
}
}
return serialPorts;
}
/**
* 初始化串口
*
* @param path 串口路径
*/
private void initSerialPort(String path) {
try {
uart3 = new SerialPort(path, 9600, 8, "n", 1);
} catch (IOException e) {
e.printStackTrace();
}
//获取输出流
mFileOutputStream3 = (FileOutputStream) uart3.getOutputStream();
//获取输入流
mFileInputStream3 = (FileInputStream) uart3.getInputStream();
}
private Handler mHandler = new Handler(Looper.getMainLooper()) {
@Override
public void handleMessage(@NonNull Message msg) {
if (msg.what == 1) {
String data = (String) msg.obj;
content.append(data + "\n");
}
}
};
/**
* 发送串口数据
*/
private void sendData() {
try {
if (mFileOutputStream3 != null) {
mFileOutputStream3.write(mBuffer);
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 开机线程接收串口数据
* 收到数据后发送的Handler刷新
*/
private void readData() {
new Thread(() -> {
while (run_flag) {
int size3 = 0;
try {
size3 = mFileInputStream3.read(mRevBuffer3);
} catch (IOException e) {
e.printStackTrace();
}
if (size3 > 0) {
String str3 = new String(mRevBuffer3, 0, size3);
Log.i("串口", "receiveData() --> " + str3);
mHandler.sendMessage(mHandler.obtainMessage(1, str3));
Arrays.fill(mRevBuffer3, (byte) 0x0);
}
}
}, "串口接收线程").start();
}
/******************************第二种串口使用方式**********************************/
private SerialPortHelper initSerialPortHelper(String port) {
SerialPortHelper serialPort = new SerialPortHelper(port, 9600);
serialPort.setSerialPortReceivedListener(new SerialPortHelper.OnSerialPortReceivedListener() {
@SuppressLint("SetTextI18n")
@Override
public void onSerialPortDataReceived(ComPortData comPortData) {
String dataStr = comPortData.getRecTime() + " 收到: " + new String(comPortData.getRecData());
mHandler.sendMessage(mHandler.obtainMessage(1, dataStr));
}
});
serialPort.open();
return serialPort;
}
private void sendDataHelper() {
if (mHelper != null && mHelper.isOpen()) {
mHelper.sendTxtString("我是SerialPortHelper");
}
}
@Override
protected void onDestroy() {
super.onDestroy();
try {
run_flag = false;
if (mFileOutputStream3 != null) mFileOutputStream3.close();
if (mFileInputStream3 != null) mFileInputStream3.close();
} catch (IOException e) {
throw new RuntimeException(e);
}
if (mHelper != null) {
mHelper.close();
}
}
} 五、源码下载地址:
完整源码