Convertitore da decimale a binario

---------------------main.xml---------------------

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">"
    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/num1"
        />
        <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/risultato"
        />
        <Button android:id="@+id/Conv"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="Converti in Binario"
                android:onClick="conv"
          />
        <Button android:id="@+id/Conv1"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:text="Converti in Decimale"
                android:onClick="toDec"
          />
</LinearLayout>

---------------------Converti.java---------------------

package org.me.binariotodecimale;

import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.view.View;
/**
*
* @author 4ALE
*/
public class Converti extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
    }
    public void conv(View view){
        EditText numero1=(EditText)findViewById(R.id.num1);
        int num1=Integer.parseInt(numero1.getText().toString());
        String bin=Integer.toBinaryString(num1);
        TextView ris=(TextView)findViewById(R.id.risultato);
        ris.setText("Binario= "+bin);
    }

    public void toDec(View view){
        EditText numero1=(EditText)findViewById(R.id.num1);
        String num1=(numero1.getText().toString());
        int dec=Integer.parseInt(num1, 2);
        TextView ris=(TextView)findViewById(R.id.risultato);
        ris.setText("Decimale= "+dec);
    }

}