My first Android App

package convert.android;

import temparature.converter.R;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;

public class temparatureActivity extends Activity {
    private EditText text;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        text = (EditText) findViewById(R.id.textField);
    }

    public void onClick(View view) {
        switch (view.getId()) {
        case R.id.button1 :
            RadioButton celsiusButton = (RadioButton) findViewById(R.id.radioButton1);
            RadioButton fahrenheitButton = (RadioButton) findViewById(R.id.radioButton2);
            if(text.getText().length() == 0) {
                Toast.makeText(this, "Please Enter a Valid Number", Toast.LENGTH_LONG).show();
                return;
            }

            float inputValue = Float.parseFloat(text.getText().toString());
            if (celsiusButton.isChecked()) {
                text.setText(String.valueOf(FahrenheitToCelsius(inputValue)));
                celsiusButton.setChecked(false);
                fahrenheitButton.setChecked(true);
            } else {
                text.setText(String.valueOf(CelsiusToFahrenheit(inputValue)));
                fahrenheitButton.setChecked(false);
                celsiusButton.setChecked(true);
            }
            break;
        }
    }

    private float CelsiusToFahrenheit(float celsius) {
        return ((celsius*9)/5) + 32;
    }

    private float FahrenheitToCelsius(float fahrenheit) {
        return ((fahrenheit-32)*5) / 9;
    }

}