MyApp_activity

package com.example.enricocirignaco.myapplication;

        import android.app.ActionBar;
        import android.app.ProgressDialog;
        import android.bluetooth.BluetoothAdapter;
        import android.bluetooth.BluetoothDevice;
        import android.bluetooth.BluetoothSocket;
        import android.content.ClipData;
        import android.content.Intent;
        import android.content.IntentFilter;
        import android.os.AsyncTask;
        import android.os.Handler;
        import android.support.v7.app.AppCompatActivity;
        import android.os.Bundle;
        import android.util.Log;
        import android.view.Menu;
        import android.view.MenuItem;
        import android.view.View;
        import android.widget.EditText;
        import android.widget.ListView;
        import android.widget.TextView;
        import android.widget.Toast;

        import java.io.IOException;
        import java.io.InputStream;
        import java.io.OutputStream;
        import java.util.UUID;


public class MainActivity extends AppCompatActivity {

    // Declaring variables
    double temperature = 17.5;
    double humidity = 64.3;
    int pressure = 1019;
    double battery = 97.70;

    double last_humidity = 23.5;
    double last_temperature = 63.5;
    int last_pressure = 1019;
    double last_battery = 97.5;

    int battery_voltage = 3400;

    String string_temperature = String.valueOf(temperature);
    String string_humidity = String.valueOf(humidity);
    String string_pressure = String.valueOf(pressure);
    String string_battery = String.valueOf(battery);

    String string_last_temperature = String.valueOf(last_humidity);
    String string_last_humidity = String.valueOf(last_temperature);
    String string_last_pressure = String.valueOf(last_pressure);
    String string_last_battery = String.valueOf(last_battery);

    String string_battery_voltage = String.valueOf(battery_voltage);

    // Declaring Widget
    TextView temperature_text;
    TextView humidity_text;
    TextView pressure_text;
    TextView battery_text;

    TextView last_temperature_text;
    TextView last_humidity_text;
    TextView last_pressure_text;
    TextView last_battery_text;

    TextView last_battery_voltage_text;

    private ProgressDialog progress;
    //String address = "98:D3:32:10:84:60";       //HC_05 MAC address
    String address = "AB:60:86:56:34:02";         //SPP MAC address


    static final UUID myUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
    private boolean isBtConnected = false;

    // Declaring Bluetooth
    BluetoothAdapter myBluetooth = null;
    BluetoothSocket btSocket = null;

    //==============================================================================================


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Set the layout
        setContentView(R.layout.activity_main);
        SetLayout();

        // Setup Bluetooth
        SetupBT();

    }




    //==============================================================================================

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        // if "Connect" Button has pushed
        if(id == R.id.action_connect) {

            //Call the class to connect
            new ConnectBT().execute();
            }

        // if "disconnect" Button has pushed
        if(id == R.id.action_disconnect) {

            //Call the class to disconnect
            DisconnectBT();
        }
        if(id == R.id.action_setting_2) {
            sendBTdata("a");
        }
        return true;
    }

    //==============================================================================================

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {

        invalidateOptionsMenu();
        if(isBtConnected == true) {
            getMenuInflater().inflate(R.menu.menu_activity_2, menu);
        }
        else{
            getMenuInflater().inflate(R.menu.menu_activity, menu);

        }
        return true;
    }

    //==============================================================================================

    // Calling the widget and set text
    public void SetLayout() {

        temperature_text = (TextView) findViewById(R.id.temperature_value_id);
        humidity_text    = (TextView) findViewById(R.id.humidity_value_id);
        pressure_text    = (TextView) findViewById(R.id.pressure_value_id);
        battery_text     = (TextView) findViewById(R.id.battery_value_id);

        last_temperature_text = (TextView) findViewById(R.id.last_temperature_id);
        last_humidity_text    = (TextView) findViewById(R.id.last_humidity_id);
        last_pressure_text    = (TextView) findViewById(R.id.last_pressure_id);
        last_battery_text     = (TextView) findViewById(R.id.last_battery_id);

        last_battery_voltage_text  = (TextView) findViewById(R.id.battery_voltage_id);

        temperature_text.setText(string_temperature + "°C");
        humidity_text.setText(string_humidity + "%");
        pressure_text.setText(string_pressure + "hPa");
        battery_text.setText(string_battery + "%");

        last_temperature_text.setText(string_last_temperature + "°C" +"(16:23" + ")");
        last_humidity_text.setText(string_last_humidity + "% (16:23" + ")");
        last_pressure_text.setText(string_last_pressure + "hPa"+ "(16:23" + ")");
        last_battery_text.setText(string_last_battery + "%" + "(16:23" + ")");

        last_battery_voltage_text.setText(string_battery_voltage + "mV");
    }

    //==============================================================================================

    // Setup Bluetooth Options
    public void SetupBT() {

        //if the device has bluetooth
        myBluetooth = BluetoothAdapter.getDefaultAdapter();

        if(myBluetooth == null)
        {
            //Show a mensag. that the device has no bluetooth adapter
            msg("Bluetooth Device Not Available");

            //finish apk
            finish();
        }
        else if(!myBluetooth.isEnabled())
        {
            //Ask to the user turn the bluetooth on
            Intent turnBTon = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(turnBTon,1);
        }


    }

    //==============================================================================================

    // function to display a string like a Toast
    private void msg(String s) {
        Toast.makeText(getApplicationContext(),s,Toast.LENGTH_LONG).show();
    }

    //==============================================================================================

    // Connect Bluetooth Process
    private class ConnectBT extends AsyncTask<Void, Void, Void> {

        private boolean ConnectSuccess = true; //if it's here, it's almost connected

        @Override
        protected void onPreExecute()
        {
            progress = ProgressDialog.show(MainActivity.this, "Connecting...", "Please wait!!!");  //show a progress dialog
        }

        @Override
        protected Void doInBackground(Void... devices) //while the progress dialog is shown, the connection is done in background
        {
            try
            {
                if (btSocket == null || !isBtConnected)
                {
                    myBluetooth = BluetoothAdapter.getDefaultAdapter();//get the mobile bluetooth device
                    BluetoothDevice dispositivo = myBluetooth.getRemoteDevice(address);//connects to the device's address and checks if it's available
                    btSocket = dispositivo.createInsecureRfcommSocketToServiceRecord(myUUID);//create a RFCOMM (SPP) connection
                    BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
                    btSocket.connect();//start connection
                }
            }
            catch (IOException e)
            {
                ConnectSuccess = false;//if the try failed, you can check the exception here
            }
            return null;
        }
        @Override
        protected void onPostExecute(Void result) //after the doInBackground, it checks if everything went fine
        {
            super.onPostExecute(result);

            if (!ConnectSuccess)
            {
                msg("Connection Failed. Try again.");
                finish();
            }
            else
            {
                msg("Connected.");
                isBtConnected = true;
            }
            progress.dismiss();
        }
    }

    //==============================================================================================

    // Disconnect Bluetooth process
    private void DisconnectBT() {

        if (btSocket!=null) //If the btSocket is busy
        {
            try
            {
                btSocket.close(); //close connection
            }
            catch (IOException e)
            { msg("Error");}
        }
        msg("Disconnected");
        isBtConnected = false;

    }

    //==============================================================================================

    // function to send string via bluetooth
    private void sendBTdata(String d) {
        if (btSocket!=null)
        {
            try
            {
                btSocket.getOutputStream().write(d.getBytes());
            }
            catch (IOException e)
            {
                msg("Error");
            }
        }

    }

    //==============================================================================================




}




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