섭씨화씨

<?xml version="1.0" encoding="UTF-8"?>

    <LinearLayout android:orientation="vertical" android:layout_height="match_parent" android:layout_width="match_parent" xmlns:android="http://schemas.android.com/apk/res/android">

    <EditText android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/editText" android:ems="10" android:inputType="number"/>


    <RadioGroup android:orientation="vertical" android:layout_height="wrap_content" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

    <RadioButton android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/radioButton2" android:layout_marginTop="11dp" android:text="화씨"/>

    <RadioButton android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/radioButton" android:text="섭씨"/>

</RadioGroup>

    <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/button" android:text="변환" android:onClick="onClicked"/>

</LinearLayout>

///////////////////////////

package com.example.emt00.myapplication;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Toast;

import com.example.emt00.myapplication.R;

public class MainActivity extends AppCompatActivity {
    private EditText text;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text = (EditText) findViewById(R.id.editText);

    }
    public void onClicked(View view) {
        switch (view.getId()) {
            case R.id.button:
                RadioButton celsiusButton = (RadioButton) findViewById(R.id.radioButton);
                RadioButton fahrenheitButton =
                        (RadioButton) findViewById(R.id.radioButton2);
                if (text.getText().length() == 0) {
                    Toast.makeText(this, "정확한 값을 입력하시오.",
                            Toast.LENGTH_LONG).show();
                    return;
                }

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

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

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