Java tutorial
/* * 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 hu.tvdr.serialport; // using wildcard imports so we can support Cordova 3.x and Cordova 2.9 import org.apache.cordova.CallbackContext; import org.apache.cordova.CordovaPlugin; import org.json.JSONObject; import org.json.JSONArray; import org.json.JSONException; import java.io.File; import java.io.FileDescriptor; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import android.util.Log; public class serialport extends CordovaPlugin { @Override public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException { try { if (action.equals("SerialPortCall")) { JSONObject arg_object = args.getJSONObject(0); File dev = new File("/dev/" + arg_object.getString("device")); this.SerialPortCall(dev, arg_object.getInt("baudrate"), arg_object.getInt("flags")); callbackContext.success("siker"); return true; } else { callbackContext.error("Invalid action"); return false; } } catch (Exception e) { System.err.println("Exception: " + e.getMessage()); callbackContext.error(e.getMessage()); return false; } } 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 void SerialPortCall(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"); } }