前段时间项目里用到了android的串口通信，网上查找资料，找到了下面一篇文章
http://lpcjrflsa.iteye.com/blog/2097280
我参考这篇文章实现了串口通信，在这里记录一下，省得以后再看的时候找不到。还有几点说明一下
1、原文使用eclipse，将android-serialport-api源码里的两个文件复制进工程里。我是用android studio，将源码直接导入到android studio里，再将app文件夹作为库添加进新项目里，具体方法前面博客已经说过了，不再赘述。
2、项目里需要android通过串口给单片机发送十六进制的指令，所以添加了hexStringToBytes（）这个方法，将String类型以十六进制发送。
3、接收数据改用线程
下面是完整代码：
MainActivity.java
package com.example.administrator.serialporttest;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import android_serialport_api.SerialPort;
public class MainActivity extends AppCompatActivity {
private Button btn_open, btn_send, btn_rec;
private EditText edRec;
private FileOutputStream mOutputStream;
private FileInputStream mInputStream;
private SerialPort sp;
private ReadThread mReadThread;
private class ReadThread extends Thread {//接收线程
@Override
public void run() {
super.run();
while (!isInterrupted()) {
int size;
try {
byte[] buffer = new byte[64];
if (mInputStream == null) return;
size = mInputStream.read(buffer);//接收数据
if (size > 0) {
onDataReceived(buffer, size);
}
} catch (IOException e) {
e.printStackTrace();
return;
}
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edRec = (EditText) findViewById(R.id.edRec);
btn_open = (Button) findViewById(R.id.open);
btn_open.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
sp = new SerialPort(new File("/dev/ttySAC3"), 19200, 0);//这里写你要打开的串口和波特率
Toast.makeText(getApplicationContext(), "open",
Toast.LENGTH_SHORT).show();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mOutputStream = (FileOutputStream) sp.getOutputStream();
mInputStream = (FileInputStream) sp.getInputStream();
}
});
btn_send = (Button) findViewById(R.id.send);
btn_send.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
try {
// mOutputStream.write(new String("send").getBytes());
mOutputStream.write(hexStringToBytes("AA01BB"));//这里发送的是十六进制的数据
Toast.makeText(getApplicationContext(), "send",
Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}
});
btn_rec = (Button) findViewById(R.id.rec);
btn_rec.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mReadThread = new ReadThread();
mReadThread.start();
}
});
}
void onDataReceived(final byte[] buffer, final int size) {
runOnUiThread(new Runnable() {
public void run() {
if (edRec != null) {
edRec.append(new String(buffer, 0, size));
}
}
});
}
public static byte[] hexStringToBytes(String inputStr) {
byte[] result = new byte[inputStr.length() / 2];
for (int i = 0; i < inputStr.length() / 2; ++i)
result[i] = (byte) (Integer.parseInt(inputStr.substring(i * 2, i * 2 + 2), 16) & 0xff);
return result;
}
@Override
protected void onDestroy() {
if (mReadThread != null)
mReadThread.interrupt();
sp = null;
super.onDestroy();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.administrator.serialporttest.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/open"
android:text="open"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/send"
android:text="send"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/rec"
android:text="rec"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/edRec"/>
</LinearLayout>
</LinearLayout>
界面设计和原文差不多，我就不放图了
下面是完整项目地址
http://download.csdn.net/detail/amazinguu/9630474
P.S:附上一个bytesToHexString（）方法，可以用来处理android通过串口接收单片机发送的十六进制数据
public static String bytesToHexString(byte[] buffer){
String result="";
for (int i = 0; i < buffer.length; i++) {
String hex = Integer.toHexString(buffer[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
result=result+hex;//result字符串长度为2的倍数
}
return result;
}
