大家好我是陳志寶一名天津全棧軟件開發(fā)工程師。本篇記錄開發(fā)時(shí)遇到的問(wèn)題以及解決方案。最近在做自動(dòng)售貨機(jī)的程序需要用到串口經(jīng)過(guò)幾天的時(shí)間終于搞明白了先來(lái)個(gè)效果圖下面是我發(fā)送的數(shù)據(jù)和接收數(shù)據(jù)的圖片下面直接上代碼新建一個(gè)類SerialPortFinder添加如下代碼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類這個(gè)類主要用來(lái)加載SO文件通過(guò)JNI的方式打開關(guān)閉串口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); } }發(fā)送和接收串口的Activitypublic class ComAActivity extends Activity { EditText editTextRecDisp; Button ButtonSendCOMA; SerialControl ComA;//串口 DispQueueThread DispQueue;//刷新顯示線程 SerialPortFinder mSerialPortFinder;//串口設(shè)備搜索 /** * 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(); //開啟串口 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]); } } //----------------------------------------------------清除按鈕、發(fā)送按鈕 class ButtonClickEvent implements View.OnClickListener { public void onClick(View v) { if (v ButtonSendCOMA) { sendPortData(ComA, 01023101000035); } } } //----------------------------------------------------串口控制類 private class SerialControl extends SerialHelper { public SerialControl() { } Override protected void onDataReceived(final ComBean ComRecData) { DispQueue.AddQueue(ComRecData);//線程定時(shí)刷新顯示(推薦) } } //----------------------------------------------------刷新顯示線程 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);//顯示性能高的話可以把此數(shù)值調(diào)小。 } catch (Exception e) { e.printStackTrace(); } break; } } } public synchronized void AddQueue(ComBean ComData) { QueueList.add(ComData); } } //----------------------------------------------------顯示接收數(shù)據(jù) 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); /** * 接收串口的數(shù)據(jù)返回值并且做相應(yīng)的處理 */ 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, 您連接了主板, Toast.LENGTH_SHORT).show(); } } //----------------------------------------------------串口發(fā)送 private void sendPortData(SerialHelper ComPort, String sOut) { if (ComPort ! null ComPort.isOpen()) { ComPort.sendHex(sOut); } } //----------------------------------------------------關(guān)閉串口 private void CloseComPort(SerialHelper ComPort) { if (ComPort ! null) { ComPort.stopSend(); ComPort.close(); } } //----------------------------------------------------打開串口 private void OpenComPort(SerialHelper ComPort) { try { ComPort.open(); } catch (SecurityException e) { ShowMessage(打開串口失敗:沒(méi)有串口讀/寫權(quán)限!); } catch (IOException e) { ShowMessage(打開串口失敗:未知錯(cuò)誤!); } catch (InvalidParameterException e) { ShowMessage(打開串口失敗:參數(shù)錯(cuò)誤!); } } //------------------------------------------顯示消息 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發(fā)送 / /LinearLayout綜合以上就可以實(shí)現(xiàn)串口間的通訊程序考進(jìn)去以后有問(wèn)題可直接留言給我我會(huì)為大家解答作者陳志寶 | 志尊寶整個(gè)Demo下載地址http://download.csdn.net/download/chen_xiaobao/9929474