lab2xm

package com.example.lab21;

import androidx.appcompat.app.AppCompatActivity;

import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.View;
import android.widget.*;


public class MainActivity extends AppCompatActivity {

    Button butCalculate;
    EditText textInNumber, textOutResult;
    RadioButton radioButtonCm, radioButtonKm, radioButtonMiles, radioButtonLy;

    String inputNumber, outputNumber;
    Double resultNumber;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        butCalculate = (Button)findViewById(R.id.butCalculate);
        textInNumber = (EditText) findViewById(R.id.textInNumber);
        textOutResult = (EditText) findViewById(R.id.textOutResult);
        radioButtonCm = (RadioButton) findViewById(R.id.radioButtonCm);
        radioButtonKm = (RadioButton) findViewById(R.id.radioButtonKm);
        radioButtonMiles = (RadioButton) findViewById(R.id.radioButtonMiles);
        radioButtonLy = (RadioButton) findViewById(R.id.radioButtonLy);

        butCalculate.setOnClickListener(
                new View.OnClickListener(){
                    public void onClick(View view){
                        inputNumber =textInNumber.getText().toString();
                        resultNumber = Double.parseDouble(inputNumber);
                        if(radioButtonCm.isChecked()) {
                            resultNumber = resultNumber * 100;
                            outputNumber = resultNumber.toString() + " cm";
                        }
                        else if(radioButtonKm.isChecked()) {
                            resultNumber = resultNumber / 1000;
                            outputNumber = resultNumber.toString() + " km";
                        }
                        else if(radioButtonMiles.isChecked()) {
                            resultNumber = (resultNumber * 0.000621371192);
                            outputNumber = resultNumber.toString() + " miles";
                        }
                        else {
                            resultNumber = resultNumber * 1.0570008340247E-16;
                            outputNumber = resultNumber.toString() + " ly";
                        }
                        textOutResult.setText(outputNumber);
                    }
                }
        );
    }
}
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<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/textInNumber"
        android:layout_width="262dp"
        android:layout_height="48dp"
        android:layout_marginStart="24dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="24dp"
        android:ems="10"
        android:inputType="number"
        app:layout_constraintEnd_toStartOf="@+id/butCalculate"
        app:layout_constraintHorizontal_bias="0.228"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/butCalculate"
        android:layout_width="87dp"
        android:layout_height="48dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="24dp"
        android:text="Oblicz"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/textOutResult"
        android:layout_width="363dp"
        android:layout_height="44dp"
        android:layout_marginStart="24dp"
        android:layout_marginEnd="24dp"
        android:layout_marginBottom="172dp"
        android:editable="false"
        android:ems="10"
        android:text="0"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent" />

    <RadioGroup
        android:layout_width="115dp"
        android:layout_height="139dp"
        android:layout_marginStart="24dp"
        android:layout_marginTop="104dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textInNumber">

        <RadioButton
            android:id="@+id/radioButtonCm"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="cm" />

        <RadioButton
            android:id="@+id/radioButtonKm"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="km" />

        <RadioButton
            android:id="@+id/radioButtonMiles"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="mile" />

        <RadioButton
            android:id="@+id/radioButtonLy"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="ly" />
    </RadioGroup>

</androidx.constraintlayout.widget.ConstraintLayout>