Zad Km/s, m/s

<?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/editText01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15pt"
        android:ems="5"
        android:inputType="number"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

    <TextView
        android:id="@+id/textView01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="km/h"
        android:textSize="15pt"
        app:layout_constraintLeft_toRightOf="@id/editText01"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_margin="5pt"
        />

    <Button
        android:id="@+id/button01"
        android:layout_width="0pt"
        android:layout_height="wrap_content"
        android:text="Oblicz"
        android:textSize="10pt"
        android:layout_margin="5pt"
        app:layout_constraintTop_toBottomOf="@id/editText01"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        android:onClick="calculate"
        />

    <TextView
        android:id="@+id/textView02"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=".............."
        android:textSize="15pt"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@id/button01"
        android:layout_margin="5pt"
        />

    <TextView
        android:id="@+id/textView03"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="m/s"
        android:textSize="15pt"
        app:layout_constraintLeft_toRightOf="@id/textView02"
        app:layout_constraintTop_toBottomOf="@id/button01"
        android:layout_margin="5pt"
        />

</androidx.constraintlayout.widget.ConstraintLayout>




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package com.example.k03;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

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

    public void calculate(View view) {
        double xx = 0;

        EditText liczba = findViewById(R.id.editText01);
        TextView wynik = findViewById(R.id.textView02);

        String x;
        x = liczba.getText().toString();
        xx = Double.parseDouble(x);

        xx=xx*1000/3600;

        wynik.setText(String.valueOf(xx));
    }
}