Elegir dos opciones:Celsius o Fahrenheit

package com.inforhomex.auditor; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.RadioButton; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private EditText editText1; private TextView textView; private RadioButton radio1; private RadioButton radio2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toast.makeText(this,"Creando App",Toast.LENGTH_SHORT).show(); editText1 = (EditText) findViewById(R.id.editText1); textView = (TextView) findViewById(R.id.textView); radio1 =(RadioButton) findViewById(R.id.radioButton); radio2 =(RadioButton) findViewById(R.id.radioButton2); } public void calculos(View view){ String valor = editText1.getText().toString(); String resultado = ""; if(radio1.isChecked()){ double celsius = (Double.parseDouble(valor) - 32 ) * 0.55555; resultado = "Celsius = "+String.valueOf(celsius); } if(radio2.isChecked()){ double fahrenheit = (Double.parseDouble(valor) * 1.8) + 32; resultado = "Fahrenheit = "+String.valueOf(fahrenheit); } Toast.makeText(this,resultado,Toast.LENGTH_SHORT).show(); textView.setText(resultado); editText1.setText(""); } @Override protected void onStart(){ super.onStart(); Toast.makeText(this,"Iniciando App",Toast.LENGTH_SHORT).show(); } @Override protected void onResume(){ super.onResume(); Toast.makeText(this,"Resumiendo App",Toast.LENGTH_SHORT).show(); } @Override protected void onPause(){ super.onPause(); Toast.makeText(this,"Pausando App",Toast.LENGTH_SHORT).show(); } @Override protected void onStop(){ super.onStop(); Toast.makeText(this,"Deteniendo App",Toast.LENGTH_SHORT).show(); } @Override protected void onDestroy(){ super.onDestroy(); Toast.makeText(this,"Destruyendo App",Toast.LENGTH_SHORT).show(); } }