Android开发(35) 使用android_serialport_api 操作串口斑马打印机

  • 2020 年 3 月 16 日
  • 筆記

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

http://blog.csdn.net/imyang2007/article/details/8331800

http://bbs.csdn.net/topics/380234030

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