How To Create A Home Appliance App For Embedded And Android

Building home automation with Java for Linux Arm and mobile devices

public abstract class UIConfig {
 
    private UIConfig() {
 
    }
 
    /**
     * Lightweight layout to low RAM devices
     */
  	public static final String LIGHT_XML_LAYOUT =     
             "xml/homeApplianceLightXML.xml";
 
    /**
     * Beautiful layout for more advanced devices
     */
public static final String BEAUTIFUL_XML_LAYOUT= 
             "xml/homeApplianceBeautifulXML.xml";
 
    /**
     * App XML layout that will be loaded by MainWindow
     */
 	 public static final String LAYOUT_TO_INITIALIZE = BEAUTIFUL_XML_LAYOUT;
 
}

In the following, you can see the two possible GUIs:

Picture 3 - The lighter interface

Picture 4 - The beautiful interface

FirebaseConfig.java

Using the Firebase configuration file, we're going to change the parameters for your Firebase application.

Change "YOUR AUTH KEY" to the authorization key given by Firebase, and change the "YOUR FIREBASE URL" to the URL of your firebase application

public abstract class FirebaseConfig {
 
    private FirebaseConfig() {
 
    }
 
    /**
     * Firebase Realtime Database Secret Key.
     */
    private static final String FIREBASE_AUTH_KEY = "YOUR AUTH KEY";
 
    /**
     * Firebase Realtime Database Commands document base URL.
     */
    public static final String COMMANDS_FIREBASE_URL = "YOUR FIREBASE URL"
            + FIREBASE_AUTH_KEY;
 
}

 
        final XmlContainerLayout xmlCont = (XmlContainerLayout) XmlContainerFactory
                .create(UIConfig.LAYOUT_TO_INITIALIZE);
 
        // Swapping from MainWindow to XmlContainerLayout.
        swap(xmlCont);
 

// Getting Button instance that matches with "android:id" tag in xml.
 // This button will decrease temp inside selector
final Button minusButton=(Button) xmlCont.getControlByID("@+id/minus");
 

 
            minusButton.addPressListener(new PressListener() {
 
                @Override
                public void controlPressed(ControlEvent e) {
                    if (insideTempLabel != null) {
                        // Sets label text decreasing temp
               insideTempLabel.setText(Convert.toString(--insideTemp));
                    }
                }
            });

 
            URI uri = new   URI(FirebaseConfig.COMMANDS_FIREBASE_URL.concat("&orderBy="timestamp""));
 
            // Performing query
            String response = HTTPConnection.doGet(uri);
 
            if (response == null || response.equalsIgnoreCase("null"))
                return; // returning to prevent NullPointerException
 
            /*
             * Parsing response in JSON Objects to get commands from remote.
             */
            JSONObject data = new JSONObject(response);
 
            List<JSONObject> listCommands = new ArrayList<JSONObject>();
 
            JSONArray ids = data.names();
            JSONArray array = data.toJSONArray(ids);
 
            for (int i = 0; i < array.length(); i++) {
                JSONObject command = array.getJSONObject(i);
                String id = ids.getString(i);
                command.put("id", id);
                listCommands.add(command);
            }

import totalcross.io.device.gpiod.GpiodChip;
import totalcross.io.device.gpiod.GpiodLine;

        if (Settings.platform.equalsIgnoreCase("linux_arm")) {
 
            // Opening Gpio chip
            gpioChip = GpiodChip.open(0);
 
            // Gets Gpio line
            pin = gpioChip.line(21);
 
           // Request line as output and set the initial state to low
            pin.requestOutput("CONSUMER", 0);
        }

public String readTemp() {
 
        // Returns default 18 value if it's not running in a embedded device.
        if (!Settings.platform.equalsIgnoreCase("linux_arm"))
            return "18";
 
        // Input from program
        String readValue = "error";
 
        try {
 
            Vm.debug("starting read sensor");
 
            // Process initialization.
            final Process process = Runtime.getRuntime().exec("python3 dht.py");
 
            // Writes output into process.
            process.getOutputStream().write("".getBytes(), 0, "".getBytes().length);
 
            // Waits for dht response.
            process.waitFor();
 
            // Getts the lineReader for the process.
            final LineReader lineReader = new LineReader(Stream.asStream(process.getInputStream()));
 
            // Reads the response.
            readValue = lineReader.readLine();
 
            Vm.debug(readValue);
            Vm.debug("finishing read sensor");
 
        } catch (java.io.IOException e) {
            e.printStackTrace();
            readValue = "40";
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
 
        // Returns the validated temp.
        return validateTemp(readValue);
    }