Android Simple Converter Program

package edu.witc.temperatureconvertermenu;


import android.R.*;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

    private static final String TEMPF = "TEMPF";
    private static final String TEMPC = "TEMPC";

    private double enterTempF;
    private double enterTempC;
    private EditText fahrenheitEditText;
    private EditText celsiusEditText;
    private EditText convertedTempC;
    private EditText convertedTempF;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);
        if ( savedInstanceState == null )
        {
            enterTempF = 0.0;
            enterTempC = 0.0;
        }
        else
        {
            enterTempF = savedInstanceState.getDouble(TEMPF);
            enterTempC = savedInstanceState.getDouble(TEMPC);
        }
        fahrenheitEditText = (EditText) findViewById(R.id.fInput);
        celsiusEditText = (EditText) findViewById(R.id.cInput);
        convertedTempC = (EditText) findViewById(R.id.cOutput);
        convertedTempF = (EditText) findViewById(R.id.fOutput);
        Button convertCelsiusButton = (Button) findViewById(R.id.convertToCelsius);
        //convertCelsiusButton.setOnClickListener(convertCelsiusButtonListener);
        Button convertFahrenheitButton = (Button) findViewById(R.id.convertToCelsius);
        //convertFahrenheitButton.setOnClickListener(convertFahrenheitButtonListener);



    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    protected void onSaveInstanceState(Bundle outState)
    {
        super.onSaveInstanceState(outState);

        outState.putDouble(TEMPF, enterTempF);
        outState.putDouble(TEMPC, enterTempC);
    }

//  public OnClickListener convertCelsiusButtonListener = new OnClickListener()
//  {
//      @Override
//      public void onClick(View v)
//      {
//          try
//          {
//              enterTempC = Double.parseDouble(celsiusEditText.getText().toString());
//          }
//          catch (NumberFormatException e)
//          {
//              enterTempC = 9999;
//          }
//          
//          if ( enterTempC == 9999)
    //convertedTempF.setText("none");
//else
//{
//  double newTempF = (9 * enterTempC / 5 ) + 32;
//  convertedTempF.setText(String.format("%.1f", newTempF));
//}
//          
//      
//      }
//  };
//  
//  public OnClickListener convertFahrenheitButtonListener = new OnClickListener()
//  {
//      @Override
//      public void onClick(View v)
//      {
//          try
//          {
//              enterTempF = Double.parseDouble(fahrenheitEditText.getText().toString());
//          }
//          catch (NumberFormatException e)
//          {
//              enterTempF = 9999;
//          }
//          
    //if ( enterTempF == 9999)
        //convertedTempC.setText("none");
    //else
    //{
    //  double newTempC = 5 * ( enterTempF - 32 ) / 9;
    //  convertedTempC.setText(String.format("%.1f", newTempC));
    //}
//      
//          
//      }
//  };


    public void Home(MenuItem item){
        setContentView(R.layout.home);
    }

    public void About(MenuItem item){
        setContentView(R.layout.about);
    }

    public void Quit(MenuItem item){
        Toast.makeText(MainActivity.this, "Thank You For Using Temperature Converter!!!", Toast.LENGTH_SHORT).show();
        finish();
    }

    public void ConvertFahrenheit(MenuItem item){
        setContentView(R.layout.f_conversion);


    }

    public void ConvertCelsius(MenuItem item){

        setContentView(R.layout.c_conversion);


    }

}