Android 串口编程

package gnu.sercd; import java.io.File; import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.util.ArrayList; import java.util.Enumeration; import android.app.AlertDialog; import android.os.Bundle; import android.preference.CheckBoxPreference; import android.preference.EditTextPreference; import android.preference.ListPreference; import android.preference.Preference; import android.preference.PreferenceActivity; import android.preference.Preference.OnPreferenceChangeListener; import android.serialport.SerialPortFinder; import android.util.Log; public class Sercd extends PreferenceActivity { protected static final String TAG = "Sercd"; private CheckBoxPreference mEnabled; private ListPreference mSerialPort; private ListPreference mNetworkInterfaces; private EditTextPreference mNetworkPort; private OnPreferenceChangeListener mPreferenceChangeListener = new OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object newValue) { preference.setSummary((CharSequence)newValue); return true; } }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /* Load preferences from XML */ addPreferencesFromResource(R.xml.preferences); /* Fetch corresponding Java objects */ mEnabled = (CheckBoxPreference)findPreference("enabled"); mSerialPort = (ListPreference)findPreference("serialport"); mNetworkInterfaces = (ListPreference)findPreference("netinterface"); mNetworkPort = (EditTextPreference)findPreference("portnumber"); /* Complete lists, etc */ mSerialPort.setOnPreferenceChangeListener(mPreferenceChangeListener); mSerialPort.setSummary(mSerialPort.getValue()); mNetworkInterfaces.setOnPreferenceChangeListener(mPreferenceChangeListener); mNetworkInterfaces.setSummary(mNetworkInterfaces.getValue()); mNetworkPort.setOnPreferenceChangeListener(mPreferenceChangeListener); mNetworkPort.setSummary(mNetworkPort.getText()); mEnabled.setOnPreferenceChangeListener(new OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object newValue) { if ((Boolean)newValue) { String serialport = mSerialPort.getValue(); String networkinterface = mNetworkInterfaces.getValue(); /* Check access permission */ File device = new File(serialport); 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()) { new AlertDialog.Builder(Sercd.this) .setMessage(R.string.su_failed) .show(); return false; } } catch (Exception e) { e.printStackTrace(); new AlertDialog.Builder(Sercd.this) .setMessage(R.string.su_failed) .show(); return false; } } int port = Integer.parseInt(mNetworkPort.getText()); Log.d(TAG, "Starting sercd with parameters " + serialport + ", " + networkinterface + ":" + port); SercdService.Start( Sercd.this, serialport, networkinterface, port ); } else { SercdService.Stop(Sercd.this); } return true; } }); feedNetworkInterfacesList(); feedSerialPortList(); if (mEnabled.isChecked()) { // SercdService.Start(this, "/dev/ttyMSM2", "127.0.0.1", 30001); } } private void feedSerialPortList() { SerialPortFinder spf = new SerialPortFinder(); mSerialPort.setEntries(spf.getAllDevices()); mSerialPort.setEntryValues(spf.getAllDevicesPath()); } private void feedNetworkInterfacesList() { Enumeration<NetworkInterface> nets; try { nets = NetworkInterface.getNetworkInterfaces(); ArrayList<String> displaynames = new ArrayList<String>(); ArrayList<String> names = new ArrayList<String>(); while(nets.hasMoreElements()) { NetworkInterface net = nets.nextElement(); Enumeration<InetAddress> inets = net.getInetAddresses(); while(inets.hasMoreElements()) { InetAddress inet = inets.nextElement(); String address = inet.getHostAddress(); displaynames.add(address + " (" + net.getDisplayName() + ")"); names.add(address); } } int size = displaynames.size(); int i; CharSequence[] a = new CharSequence[size]; CharSequence[] b = new CharSequence[size]; for (i=0; i<size; i++) { a[i] = displaynames.get(i); b[i] = names.get(i); } mNetworkInterfaces.setEntries(a); mNetworkInterfaces.setEntryValues(b); } catch (SocketException e) { e.printStackTrace(); } } @Override protected void onDestroy() { // SercdService.Stop(this); super.onDestroy(); } }