es.curso.android.arduino.Main.java Source code

Introduction

Here is the source code for es.curso.android.arduino.Main.java

Source

/*
 *    Copyright (C) 2012 - Roberto Calvo Palomino
 * 
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *    
 *    
 *    Authors: Roberto Calvo <rocapal [at] gmail [dot] com>
 */

package es.curso.android.arduino;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class Main extends Activity {

    Button btLed;
    TextView tvStatus;
    Timer mTempTimer;

    private final String URL = "http://192.168.1.10/";

    private final Integer UPDATED_TIME = 3000;

    int statusButton = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        setupWidgets();

        launchTimerTask();

        statusButton = 0;
        stateButton();
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();

        statusButton = 1;
        stateButton();

        if (mTempTimer != null)
            mTempTimer.cancel();

    }

    private void setupWidgets() {

        btLed = (Button) findViewById(R.id.btLed);
        tvStatus = (TextView) findViewById(R.id.tvStatus);

        btLed.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                stateButton();
            }
        });
    }

    private void stateButton() {
        if (statusButton == 0) {
            btLed.setText("LED OFF");
            doPetition(URL + "led/on");
            statusButton = 1;
        } else if (statusButton == 1) {
            btLed.setText("LED ON");
            doPetition(URL + "led/off");

            statusButton = 0;
        }
    }

    private String doPetition(String url) {

        HttpClient httpclient = new DefaultHttpClient();
        HttpResponse response;
        try {
            response = httpclient.execute(new HttpGet(url));
            StatusLine statusLine = response.getStatusLine();
            if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                response.getEntity().writeTo(out);
                out.close();
                String responseString = out.toString();
                Log.d("Main", responseString);
                return responseString;

            } else {
                //Closes the connection.
                response.getEntity().getContent().close();
                return null;
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;

    }

    private JSONObject parseJSON(String response) {
        try {
            return new JSONObject(response);

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return null;

    }

    private void showData(JSONObject json) {
        String msg = "";

        msg = "Switch: ";
        if (json.has("switch")) {
            try {
                Integer value = json.getInt("switch");
                if (value == 1)
                    msg += "ON";
                else
                    msg += "OFF";

            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        msg += " - Temp: ";
        if (json.has("temp")) {
            try {
                Double value = json.getDouble("temp");
                msg += value.toString();

            } catch (JSONException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

        final String msgFinal = msg;

        Main.this.runOnUiThread(new Runnable() {

            @Override
            public void run() {
                tvStatus.setText(msgFinal);
            }
        });
    }

    private void launchTimerTask() {

        mTempTimer = new Timer();

        mTempTimer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                String response = doPetition(URL + "status/");
                JSONObject json = parseJSON(response);
                showData(json);

            }
        }, 0, UPDATED_TIME);

    }

}