大家好我是陈志宝一名天津全栈软件开发工程师。本篇记录开发时遇到的问题以及解决方案。最近在做自动售货机的程序需要用到串口经过几天的时间终于搞明白了先来个效果图下面是我发送的数据和接收数据的图片下面直接上代码新建一个类SerialPortFinder添加如下代码public class SerialPortFinder { public class Driver { public Driver(String name, String root) { mDriverName name; mDeviceRoot root; } private String mDriverName; private String mDeviceRoot; VectorFile mDevices null; public VectorFile getDevices() { if (mDevices null) { mDevices new VectorFile(); File dev new File(/dev); File[] files dev.listFiles(); int i; for (i0; ifiles.length; i) { if (files[i].getAbsolutePath().startsWith(mDeviceRoot)) { Log.d(TAG, Found new device: files[i]); mDevices.add(files[i]); } } } return mDevices; } public String getName() { return mDriverName; } } private static final String TAG SerialPort; private VectorDriver mDrivers null; VectorDriver getDrivers() throws IOException { if (mDrivers null) { mDrivers new VectorDriver(); LineNumberReader r new LineNumberReader(new FileReader(/proc/tty/drivers)); String l; while((l r.readLine()) ! null) { // Issue 3: // Since driver name may contain spaces, we do not extract driver name with split() String drivername l.substring(0, 0x15).trim(); String[] w l.split( ); if ((w.length 5) (w[w.length-1].equals(serial))) { Log.d(TAG, Found new driver drivername on w[w.length-4]); mDrivers.add(new Driver(drivername, w[w.length-4])); } } r.close(); } return mDrivers; } public String[] getAllDevices() { VectorString devices new VectorString(); // Parse each driver IteratorDriver itdriv; try { itdriv getDrivers().iterator(); while(itdriv.hasNext()) { Driver driver itdriv.next(); IteratorFile itdev driver.getDevices().iterator(); while(itdev.hasNext()) { String device itdev.next().getName(); String value String.format(%s (%s), device, driver.getName()); devices.add(value); } } } catch (IOException e) { e.printStackTrace(); } return devices.toArray(new String[devices.size()]); } public String[] getAllDevicesPath() { VectorString devices new VectorString(); // Parse each driver IteratorDriver itdriv; try { itdriv getDrivers().iterator(); while(itdriv.hasNext()) { Driver driver itdriv.next(); IteratorFile itdev driver.getDevices().iterator(); while(itdev.hasNext()) { String device itdev.next().getAbsolutePath(); devices.add(device); } } } catch (IOException e) { e.printStackTrace(); } return devices.toArray(new String[devices.size()]); }新建SerialPort类这个类主要用来加载SO文件通过JNI的方式打开关闭串口public class SerialPort { private static final String TAG SerialPort; /* * Do not remove or rename the field mFd: it is used by native method close(); */ private FileDescriptor mFd; private FileInputStream mFileInputStream; private FileOutputStream mFileOutputStream; public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException { /* Check access permission */ if (!device.canRead() || !device.canWrite()) { try { /* Missing read/write permission, trying to chmod the file */ Process su; su Runtime.getRuntime().exec(/system/bin/su); String cmd chmod 666 device.getAbsolutePath() \n exit\n; su.getOutputStream().write(cmd.getBytes()); if ((su.waitFor() ! 0) || !device.canRead() || !device.canWrite()) { throw new SecurityException(); } } catch (Exception e) { e.printStackTrace(); throw new SecurityException(); } } mFd open(device.getAbsolutePath(), baudrate, flags); if (mFd null) { Log.e(TAG, native open returns null); throw new IOException(); } mFileInputStream new FileInputStream(mFd); mFileOutputStream new FileOutputStream(mFd); } // Getters and setters public InputStream getInputStream() { return mFileInputStream; } public OutputStream getOutputStream() { return mFileOutputStream; } // JNI private native static FileDescriptor open(String path, int baudrate, int flags); public native void close(); static { System.loadLibrary(serial_port); } }发送和接收串口的Activitypublic class ComAActivity extends Activity { EditText editTextRecDisp; Button ButtonSendCOMA; SerialControl ComA;//串口 DispQueueThread DispQueue;//刷新显示线程 SerialPortFinder mSerialPortFinder;//串口设备搜索 /** * Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main2); ComA new SerialControl(); DispQueue new DispQueueThread(); DispQueue.start(); setControls(); //开启串口 ComA.setPort(/dev/ttyS2); ComA.setBaudRate(115200); OpenComPort(ComA); } Override public void onDestroy() { CloseComPort(ComA); super.onDestroy(); } Override public void onBackPressed() { AseoZdpAseo.initPush(this); Intent intent new Intent(Intent.ACTION_MAIN); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.addCategory(Intent.CATEGORY_HOME); AseoZdpAseo.initFinalTimer(this); startActivity(intent); } //---------------------------------------------------- private void setControls() { editTextRecDisp (EditText) findViewById(R.id.editTextRecDisp); ButtonSendCOMA (Button) findViewById(R.id.ButtonSendCOMA); ButtonSendCOMA.setOnClickListener(new ButtonClickEvent()); mSerialPortFinder new SerialPortFinder(); String[] entryValues mSerialPortFinder.getAllDevicesPath(); ListString allDevices new ArrayListString(); for (int i 0; i entryValues.length; i) { allDevices.add(entryValues[i]); } } //----------------------------------------------------清除按钮、发送按钮 class ButtonClickEvent implements View.OnClickListener { public void onClick(View v) { if (v ButtonSendCOMA) { sendPortData(ComA, 01023101000035); } } } //----------------------------------------------------串口控制类 private class SerialControl extends SerialHelper { public SerialControl() { } Override protected void onDataReceived(final ComBean ComRecData) { DispQueue.AddQueue(ComRecData);//线程定时刷新显示(推荐) } } //----------------------------------------------------刷新显示线程 private class DispQueueThread extends Thread { private QueueComBean QueueList new LinkedListComBean(); Override public void run() { super.run(); while (!isInterrupted()) { final ComBean ComData; while ((ComData QueueList.poll()) ! null) { runOnUiThread(new Runnable() { public void run() { DispRecData(ComData); } }); try { Thread.sleep(100);//显示性能高的话可以把此数值调小。 } catch (Exception e) { e.printStackTrace(); } break; } } } public synchronized void AddQueue(ComBean ComData) { QueueList.add(ComData); } } //----------------------------------------------------显示接收数据 private void DispRecData(ComBean ComRecData) { StringBuilder sMsg new StringBuilder(); sMsg.append(ComRecData.sRecTime); sMsg.append([); sMsg.append(ComRecData.sComPort); sMsg.append(]); sMsg.append([Hex] ); sMsg.append(MyFunc.ByteArrToHex(ComRecData.bRec)); sMsg.append(\r\n); /** * 接收串口的数据返回值并且做相应的处理 */ editTextRecDisp.append(sMsg); String[] temp MyFunc.StrToStrArray(MyFunc.ByteArrToHex(ComRecData.bRec)); if (temp.equals(FF 01 01 01 02 01 04 )) { Toast.makeText(ComAActivity.this, 您连接了主板, Toast.LENGTH_SHORT).show(); } } //----------------------------------------------------串口发送 private void sendPortData(SerialHelper ComPort, String sOut) { if (ComPort ! null ComPort.isOpen()) { ComPort.sendHex(sOut); } } //----------------------------------------------------关闭串口 private void CloseComPort(SerialHelper ComPort) { if (ComPort ! null) { ComPort.stopSend(); ComPort.close(); } } //----------------------------------------------------打开串口 private void OpenComPort(SerialHelper ComPort) { try { ComPort.open(); } catch (SecurityException e) { ShowMessage(打开串口失败:没有串口读/写权限!); } catch (IOException e) { ShowMessage(打开串口失败:未知错误!); } catch (InvalidParameterException e) { ShowMessage(打开串口失败:参数错误!); } } //------------------------------------------显示消息 private void ShowMessage(String sMsg) { Toast.makeText(this, sMsg, Toast.LENGTH_SHORT).show(); } }布局文件?xml version1.0 encodingutf-8? LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/android android:layout_widthfill_parent android:layout_heightfill_parent android:orientationvertical LinearLayout android:idid/LinearLayoutRecDisp android:layout_widthmatch_parent android:layout_heightfill_parent android:layout_weight1 EditText android:idid/editTextRecDisp android:layout_widthfill_parent android:layout_heightmatch_parent android:layout_weight1 android:clickablefalse android:editablefalse android:gravitytop android:longClickablefalse android:textSize14sp / /LinearLayout Button android:idid/ButtonSendCOMA android:layout_widthwrap_content android:layout_heightwrap_content android:text发送 / /LinearLayout综合以上就可以实现串口间的通讯程序考进去以后有问题可直接留言给我我会为大家解答作者陈志宝 | 志尊宝整个Demo下载地址http://download.csdn.net/download/chen_xiaobao/9929474 Android 串口通信之间的发送数据与接收数据（详解）
大家好我是陈志宝一名天津全栈软件开发工程师。本篇记录开发时遇到的问题以及解决方案。最近在做自动售货机的程序需要用到串口经过几天的时间终于搞明白了先来个效果图下面是我发送的数据和接收数据的图片下面直接上代码新建一个类SerialPortFinder添加如下代码public class SerialPortFinder { public class Driver { public Driver(String name, String root) { mDriverName name; mDeviceRoot root; } private String mDriverName; private String mDeviceRoot; VectorFile mDevices null; public VectorFile getDevices() { if (mDevices null) { mDevices new VectorFile(); File dev new File(/dev); File[] files dev.listFiles(); int i; for (i0; ifiles.length; i) { if (files[i].getAbsolutePath().startsWith(mDeviceRoot)) { Log.d(TAG, Found new device: files[i]); mDevices.add(files[i]); } } } return mDevices; } public String getName() { return mDriverName; } } private static final String TAG SerialPort; private VectorDriver mDrivers null; VectorDriver getDrivers() throws IOException { if (mDrivers null) { mDrivers new VectorDriver(); LineNumberReader r new LineNumberReader(new FileReader(/proc/tty/drivers)); String l; while((l r.readLine()) ! null) { // Issue 3: // Since driver name may contain spaces, we do not extract driver name with split() String drivername l.substring(0, 0x15).trim(); String[] w l.split( ); if ((w.length 5) (w[w.length-1].equals(serial))) { Log.d(TAG, Found new driver drivername on w[w.length-4]); mDrivers.add(new Driver(drivername, w[w.length-4])); } } r.close(); } return mDrivers; } public String[] getAllDevices() { VectorString devices new VectorString(); // Parse each driver IteratorDriver itdriv; try { itdriv getDrivers().iterator(); while(itdriv.hasNext()) { Driver driver itdriv.next(); IteratorFile itdev driver.getDevices().iterator(); while(itdev.hasNext()) { String device itdev.next().getName(); String value String.format(%s (%s), device, driver.getName()); devices.add(value); } } } catch (IOException e) { e.printStackTrace(); } return devices.toArray(new String[devices.size()]); } public String[] getAllDevicesPath() { VectorString devices new VectorString(); // Parse each driver IteratorDriver itdriv; try { itdriv getDrivers().iterator(); while(itdriv.hasNext()) { Driver driver itdriv.next(); IteratorFile itdev driver.getDevices().iterator(); while(itdev.hasNext()) { String device itdev.next().getAbsolutePath(); devices.add(device); } } } catch (IOException e) { e.printStackTrace(); } return devices.toArray(new String[devices.size()]); }新建SerialPort类这个类主要用来加载SO文件通过JNI的方式打开关闭串口public class SerialPort { private static final String TAG SerialPort; /* * Do not remove or rename the field mFd: it is used by native method close(); */ private FileDescriptor mFd; private FileInputStream mFileInputStream; private FileOutputStream mFileOutputStream; public SerialPort(File device, int baudrate, int flags) throws SecurityException, IOException { /* Check access permission */ if (!device.canRead() || !device.canWrite()) { try { /* Missing read/write permission, trying to chmod the file */ Process su; su Runtime.getRuntime().exec(/system/bin/su); String cmd chmod 666 device.getAbsolutePath() \n exit\n; su.getOutputStream().write(cmd.getBytes()); if ((su.waitFor() ! 0) || !device.canRead() || !device.canWrite()) { throw new SecurityException(); } } catch (Exception e) { e.printStackTrace(); throw new SecurityException(); } } mFd open(device.getAbsolutePath(), baudrate, flags); if (mFd null) { Log.e(TAG, native open returns null); throw new IOException(); } mFileInputStream new FileInputStream(mFd); mFileOutputStream new FileOutputStream(mFd); } // Getters and setters public InputStream getInputStream() { return mFileInputStream; } public OutputStream getOutputStream() { return mFileOutputStream; } // JNI private native static FileDescriptor open(String path, int baudrate, int flags); public native void close(); static { System.loadLibrary(serial_port); } }发送和接收串口的Activitypublic class ComAActivity extends Activity { EditText editTextRecDisp; Button ButtonSendCOMA; SerialControl ComA;//串口 DispQueueThread DispQueue;//刷新显示线程 SerialPortFinder mSerialPortFinder;//串口设备搜索 /** * Called when the activity is first created. */ Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main2); ComA new SerialControl(); DispQueue new DispQueueThread(); DispQueue.start(); setControls(); //开启串口 ComA.setPort(/dev/ttyS2); ComA.setBaudRate(115200); OpenComPort(ComA); } Override public void onDestroy() { CloseComPort(ComA); super.onDestroy(); } Override public void onBackPressed() { AseoZdpAseo.initPush(this); Intent intent new Intent(Intent.ACTION_MAIN); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.addCategory(Intent.CATEGORY_HOME); AseoZdpAseo.initFinalTimer(this); startActivity(intent); } //---------------------------------------------------- private void setControls() { editTextRecDisp (EditText) findViewById(R.id.editTextRecDisp); ButtonSendCOMA (Button) findViewById(R.id.ButtonSendCOMA); ButtonSendCOMA.setOnClickListener(new ButtonClickEvent()); mSerialPortFinder new SerialPortFinder(); String[] entryValues mSerialPortFinder.getAllDevicesPath(); ListString allDevices new ArrayListString(); for (int i 0; i entryValues.length; i) { allDevices.add(entryValues[i]); } } //----------------------------------------------------清除按钮、发送按钮 class ButtonClickEvent implements View.OnClickListener { public void onClick(View v) { if (v ButtonSendCOMA) { sendPortData(ComA, 01023101000035); } } } //----------------------------------------------------串口控制类 private class SerialControl extends SerialHelper { public SerialControl() { } Override protected void onDataReceived(final ComBean ComRecData) { DispQueue.AddQueue(ComRecData);//线程定时刷新显示(推荐) } } //----------------------------------------------------刷新显示线程 private class DispQueueThread extends Thread { private QueueComBean QueueList new LinkedListComBean(); Override public void run() { super.run(); while (!isInterrupted()) { final ComBean ComData; while ((ComData QueueList.poll()) ! null) { runOnUiThread(new Runnable() { public void run() { DispRecData(ComData); } }); try { Thread.sleep(100);//显示性能高的话可以把此数值调小。 } catch (Exception e) { e.printStackTrace(); } break; } } } public synchronized void AddQueue(ComBean ComData) { QueueList.add(ComData); } } //----------------------------------------------------显示接收数据 private void DispRecData(ComBean ComRecData) { StringBuilder sMsg new StringBuilder(); sMsg.append(ComRecData.sRecTime); sMsg.append([); sMsg.append(ComRecData.sComPort); sMsg.append(]); sMsg.append([Hex] ); sMsg.append(MyFunc.ByteArrToHex(ComRecData.bRec)); sMsg.append(\r\n); /** * 接收串口的数据返回值并且做相应的处理 */ editTextRecDisp.append(sMsg); String[] temp MyFunc.StrToStrArray(MyFunc.ByteArrToHex(ComRecData.bRec)); if (temp.equals(FF 01 01 01 02 01 04 )) { Toast.makeText(ComAActivity.this, 您连接了主板, Toast.LENGTH_SHORT).show(); } } //----------------------------------------------------串口发送 private void sendPortData(SerialHelper ComPort, String sOut) { if (ComPort ! null ComPort.isOpen()) { ComPort.sendHex(sOut); } } //----------------------------------------------------关闭串口 private void CloseComPort(SerialHelper ComPort) { if (ComPort ! null) { ComPort.stopSend(); ComPort.close(); } } //----------------------------------------------------打开串口 private void OpenComPort(SerialHelper ComPort) { try { ComPort.open(); } catch (SecurityException e) { ShowMessage(打开串口失败:没有串口读/写权限!); } catch (IOException e) { ShowMessage(打开串口失败:未知错误!); } catch (InvalidParameterException e) { ShowMessage(打开串口失败:参数错误!); } } //------------------------------------------显示消息 private void ShowMessage(String sMsg) { Toast.makeText(this, sMsg, Toast.LENGTH_SHORT).show(); } }布局文件?xml version1.0 encodingutf-8? LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/android android:layout_widthfill_parent android:layout_heightfill_parent android:orientationvertical LinearLayout android:idid/LinearLayoutRecDisp android:layout_widthmatch_parent android:layout_heightfill_parent android:layout_weight1 EditText android:idid/editTextRecDisp android:layout_widthfill_parent android:layout_heightmatch_parent android:layout_weight1 android:clickablefalse android:editablefalse android:gravitytop android:longClickablefalse android:textSize14sp / /LinearLayout Button android:idid/ButtonSendCOMA android:layout_widthwrap_content android:layout_heightwrap_content android:text发送 / /LinearLayout综合以上就可以实现串口间的通讯程序考进去以后有问题可直接留言给我我会为大家解答作者陈志宝 | 志尊宝整个Demo下载地址http://download.csdn.net/download/chen_xiaobao/9929474