Урок 24: Теорема Пифагора

MainActivity

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import com.neco_desarrollo.pifagorapp.databinding.ActivityMainBinding
import kotlin.math.pow
import kotlin.math.sqrt

class MainActivity : AppCompatActivity() {
    lateinit var binding: ActivityMainBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
    }

    fun onClickResult(view: View){
        if(!isFieldEmpty()){
            val result = getString(R.string.result_info) + getResult()
            binding.tvResult.text = result
        }
    }

    private fun isFieldEmpty(): Boolean{
        binding.apply {
            if(edA.text.isNullOrEmpty()) edA.error = "Поле должно быть заполнено"
            if(edB.text.isNullOrEmpty()) edB.error = "Поле должно быть заполнено"
            return  edA.text.isNullOrEmpty() || edB.text.isNullOrEmpty()
        }
    }

    private fun getResult(): String{
        val a: Double
        val b: Double
        binding.apply {
            a = edA.text.toString().toDouble()
            b = edB.text.toString().toDouble()
        }
        return sqrt((a.pow(2) + b.pow(2))).toString()
    }
}

strings.xml

<resources>
    <string name="app_name">PifagorApp</string>
    <string name="title">Вычислить "С"</string>
    <string name="result_info">Результат:&#160;</string>
    <string name="result">Результат</string>
    <string name="input_a">Введите значение \"a\"</string>
    <string name="input_b">Введите значение \"b\"</string>
</resources>

activity_main.xml

<?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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="@string/title"
        android:textColor="@color/black"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:srcCompat="@drawable/image" />

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5" />

    <TextView
        android:id="@+id/tvResult"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="@string/result_info"
        android:textColor="@color/black"
        android:textSize="20sp"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="@+id/imageView"
        app:layout_constraintStart_toStartOf="@+id/imageView"
        app:layout_constraintTop_toTopOf="@+id/guideline2" />

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/textInputLayout"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="1dp"
        app:layout_constraintEnd_toEndOf="@+id/imageView"
        app:layout_constraintStart_toStartOf="@+id/imageView"
        app:layout_constraintTop_toBottomOf="@+id/tvResult">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/edA"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/input_a"
            android:inputType="number" />
    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/textInputLayoutb"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="1dp"
        app:layout_constraintEnd_toEndOf="@+id/imageView"
        app:layout_constraintStart_toStartOf="@+id/imageView"
        app:layout_constraintTop_toBottomOf="@+id/textInputLayout">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/edB"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/input_b"
            android:inputType="number" />
    </com.google.android.material.textfield.TextInputLayout>

    <Button
        android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:onClick="onClickResult"
        android:text="@string/result"
        app:backgroundTint="@color/grey"
        app:layout_constraintEnd_toEndOf="@+id/textInputLayoutb"
        app:layout_constraintStart_toStartOf="@+id/textInputLayoutb"
        app:layout_constraintTop_toBottomOf="@+id/textInputLayoutb" />

</androidx.constraintlayout.widget.ConstraintLayout>

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