Arduino.java

/*
Copyright 2017 Pavitra, All rights reserved
Released under the Apache License, Version 2.0
http://www.apache.org/licenses/LICENSE-2.0
*/

package com.pavitra;

import android.content.Context;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

//import java.io.UnsupportedEncodingException;

import com.physicaloid.lib.*;

import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.runtime.*;
import com.google.appinventor.components.common.*;

@DesignerComponent(version = Arduino.VERSION,
                   description = "Arduino USB Serial Extension by Pavitra.\nVersion: " + Arduino.VERSION,
                   category = ComponentCategory.EXTENSION,
                   nonVisible = true,
                   iconName = "images/extension.png")		   
@SimpleObject(external = true)
@UsesLibraries(libraries = "physicaloid.jar")

public class Arduino extends AndroidNonvisibleComponent implements Component {
  public static final int VERSION = 3;
  private ComponentContainer container;
  private Context context;
  private final Activity activity;
  private static final String LOG_TAG = "Arduino USB Serial Extension";
  private boolean suppressToast = false;
  private String str;
  private int baudRate = 9600;
  
  Physicaloid mPhysicaloid;
  
  public Arduino(ComponentContainer container) {
    super(container.$form());
    this.container = container;
	context = (Context) container.$context();
    activity = (Activity) container.$context();
    Log.d(LOG_TAG, "Arduino USB Serial Extension Created");
  }
  
  @SimpleFunction(description="Initialize")
  public void Initialize() {
  mPhysicaloid = new Physicaloid(this.context);
  
  showToast("Arduino Initialised");
  }
  
  @SimpleFunction(description="Open connection. Default baud rate is 9600 bps")
  public void Open() {
  mPhysicaloid.open();
  
  showToast("Opened");
  }
  
  @SimpleFunction(description="Close connection")
  public void Close() {
  mPhysicaloid.close();
  
  showToast("Closed");
  }
  
  @SimpleFunction(description="Baud Rate")
  public void BaudRate(int baudRate) {
	  this.baudRate = baudRate;
	  mPhysicaloid.setBaudrate(baudRate);
	  
	  showToast("Closed");
  }
  
  @SimpleFunction(description="Read from Serial")
  public String Read() {
	byte[] buf = new byte[256];
	
    int readSize=0;
    readSize = mPhysicaloid.read(buf, buf.length);
	
    if(readSize>0) {
      try { 
          str = new String(buf);
    } catch (RuntimeException e) {
			showToast(e.toString());
            } 
        }
		
		/* mPhysicaloid.read(buf, buf.length);
		String str = new String(buf);*/
		
		showToast("Reading: " + str);
		
		return str;
  }
  
  @SimpleFunction(description="Write Data to Serial")
  public void Write(String writeData) {
	String str = writeData;
        if(str.length()>0) {
            byte[] buf = str.getBytes();   
            mPhysicaloid.write(buf, buf.length);
			
			showToast("Writing: " + str);
        } 
  }
  
  //Show Toast
  @DesignerProperty(editorType = PropertyTypeConstants.PROPERTY_TYPE_BOOLEAN,
      defaultValue = "false")
  @SimpleProperty
  public void SuppressToast(boolean suppressToast) {
    this.suppressToast = suppressToast;
  }

  @SimpleProperty(category = PropertyCategory.BEHAVIOR,
      description = "whether Toast should be suppressed")
  public boolean SuppressToast() {
    return suppressToast;
  }

  private void showToast(String message) {
        if (!suppressToast) {
		Toast.makeText(this.context, message, Toast.LENGTH_SHORT).show();
		}
    }
}