概述
使用android设备操作串口的 斑马GK888T打印机，使用打印机打印二维码。
硬件设备连接方式：
安卓设备 通过 串口RS232 连接 斑马打印机的串口
串口操作类库 android_serialport_api
使用安卓设备操作串口的问题。 我找到一个框架：android_serialport_api，这个框架被托管在：
https://code.google.com/p/android-serialport-api/ 谷歌的代码库，无奈国内无法下载
https://github.com/cepr/android-serialport-api GITHUB的地址，这个可以下载
步骤
下载后，阅读下源代码，准备使用。
1.拷贝 jni 文件夹下的文件到 你的project中, 这些是jni调用的设定文件，包括:
Android.mk
Application.mk
gen_SerialPort_h.sh
SerialPort.c
SerialPort.h
2.拷贝libs 下的文件到你的 project中，这些是原生库，包括
armeabi/libserial_port.so
armeabi-v7a/libserial_port.so
x86/libserial_port.so
3.在你的项目下新建 package: android_serialport_api，拷贝下列src下的class 到这个package下
Application.java
SerialPort.java
SerialPortActivity.java
SerialPortFinder.java
注意， package名称一定要是android_serialport_api。或者你需要修改Android.mk下对应的模块配置项。不然会提示找不到jni调用的库
4.拷贝资源文件等：
string.xml 的内容：
<string name="error_configuration">Please configure your serial port first.</string>
<string name="error_security">You do not have read/write permission to the serial
port.</string>
<string name="error_unknown">The serial port can not be opened for an unknown
reason.</string>
5.修改AndroidManifest.xml，在application节点指定对应的 "android:name" 配置，如下面红色文字所示
<application
android:allowBackup="true"
android:name="android_serialport_api.Application"
android:theme="@style/AppTheme" >
6.下面写测试的activity。我的设备连接在安卓设备的端口 ”ttyS2”上，下面是个演示：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:keepScreenOn="true"
android:orientation="vertical" >
<EditText
android:id="@+id/EditTextReception"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="7"
android:gravity="top"
android:hint="Reception"
android:isScrollContainer="true"
android:scrollbarStyle="insideOverlay" >
</EditText>
<EditText
android:id="@+id/EditTextEmission"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="Emission"
android:lines="4"
android:text="" >
</EditText>
<Button
android:id="@+id/btnSend"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Send" />
</LinearLayout>
/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package zyf.serialportdemo;
import java.io.IOException;
import zyf.serialportdemo.R;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.TextView.OnEditorActionListener;
import android_serialport_api.SerialPortActivity;
public class ConsoleActivity extends SerialPortActivity {
Button btnSend;
EditText mReception;
EditText mEmission;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.console);
// setTitle("Loopback test");
mReception = (EditText) findViewById(R.id.EditTextReception);
mEmission = (EditText) findViewById(R.id.EditTextEmission);
btnSend = (Button)findViewById(R.id.btnSend);
btnSend.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String text = mEmission.getText().toString();
try {
mOutputStream.write(new String(text).getBytes());
mOutputStream.write('\n');
} catch (IOException e) {
e.printStackTrace();
}
}
});
//发送指令到斑马打印机
mEmission.setText("^XA^A0N,40,30^FO50,150^FDHELLO WORLD^FS^XZ");
/*二维码指令
^XA
^PMY
^FO200,200^BQ,2,10
^FDD03040C,LA,012345678912AABBqrcode^FS
^XZ
*/
}
@Override
protected void onDataReceived(final byte[] buffer, final int size) {
runOnUiThread(new Runnable() {
public void run() {
if (mReception != null) {
mReception.append(new String(buffer, 0, size));
}
}
});
}
}
/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android_serialport_api;
import java.io.File;
import java.io.IOException;
import java.security.InvalidParameterException;
import android.content.SharedPreferences;
public class Application extends android.app.Application {
public SerialPortFinder mSerialPortFinder = new SerialPortFinder();
private SerialPort mSerialPort = null;
public SerialPort getSerialPort() throws SecurityException, IOException, InvalidParameterException {
if (mSerialPort == null) {
/* Read serial port parameters */
//SharedPreferences sp = getSharedPreferences("android_serialport_api.sample_preferences", MODE_PRIVATE);
//String path = sp.getString("DEVICE", "");
//String path = "ttyS2";
String path = "/dev/ttyS2";//指定端口
//int baudrate = Integer.decode(sp.getString("BAUDRATE", "-1"));
int baudrate = 9600;//指定速率
/* Check parameters */
if ( (path.length() == 0) || (baudrate == -1)) {
throw new InvalidParameterException();
}
/* Open the serial port */
mSerialPort = new SerialPort(new File(path), baudrate, 0);
}
return mSerialPort;
}
public void closeSerialPort() {
if (mSerialPort != null) {
mSerialPort.close();
mSerialPort = null;
}
}
}
最后别忘了一个操作权限的问题，很多设备直接操作串口，会提示无权限 read/write 的问题，需要java层去提权，方法如下：
使用下面的方法执行指令： chmod 777 /dev/ttyS2
public void exeShell(String cmd){
try{
Process p = Runtime.getRuntime().exec(cmd);
BufferedReader in = new BufferedReader(
new InputStreamReader(
p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
Log.i("exeShell",line);
}
}
catch(Throwable t)
{
t.printStackTrace();
}
}
手动解决方法：
打开cmd，进入 adb shell，执行：chmod 777 /dev/ttyS2
https://code.google.com/p/android-serialport-api/
https://github.com/cepr/android-serialport-api
http://blog.csdn.net/imyang2007/article/details/8331800
