Esercizio convertitore temperatura gradi celsius-fahrenheit e viceversa

main.xml:


android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1"
>


android:id="@+id/temperatura1"
android:layout_width="150px"
android:layout_height="wrap_content"
/>




android:id="@+id/temperatura2"
android:layout_width="150px"
android:layout_height="wrap_content"
/>




android:id="@+id/converti1"
android:layout_width="150px"
android:layout_height="wrap_content"
android:onClick="converti1"
android:text="Da centigradi a fahrenheit"
/>

android:id="@+id/converti2"
android:layout_width="150px"
android:layout_height="wrap_content"
android:onClick="converti2"
android:text="Da fahrenheit a centigradi"
/>





Parte Sorgente:

package com.mio.convertitemperatura;
import android.app.Activity;
import android.os.Bundle;
import android.content.Context;
import android.widget.*;
import android.view.View;
import android.content.Intent;
public class Converti extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void converti1 (View view){
EditText temperatura1=(EditText)findViewById(R.id.temperatura1);
double centigradi=Double.parseDouble(temperatura1.getText().toString());
double temperatura=centigradi*1.8+32;
String risposta=Double.toString(temperatura);
EditText temperatura2=(EditText)findViewById(R.id.temperatura2);
temperatura2.setText(risposta);
temperatura1.setText("");
}
public void converti2 (View view){
EditText temperatura2=(EditText)findViewById(R.id.temperatura2);
double centigradi=Double.parseDouble(temperatura2.getText().toString());
double temperatura=(centigradi-32)/1.8;
String risposta=Double.toString(temperatura);
EditText temperatura1=(EditText)findViewById(R.id.temperatura1);
temperatura1.setText(risposta);
temperatura2.setText("");
}
}

http://img687.imageshack.us/img687/6404/david1w.jpg