前回、1次元配列を使った四択クイズアプリをつくりました。
今回は、配列の中に配列を入れる多次元配列(2次元配列)を使って、
四択クイズアプリを作っていきましょう

動画

コード

▼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/tvCount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="24dp"
        android:layout_marginRight="24dp"
        android:text="1問目"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvQuestion"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Question"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tvCount" />

    <Button
        android:id="@+id/btn0"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="90dp"
        android:text="Button"
        app:layout_constraintTop_toBottomOf="@+id/tvQuestion"
        tools:layout_editor_absoluteX="177dp" />

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Button"
        app:layout_constraintTop_toBottomOf="@+id/btn0"
        tools:layout_editor_absoluteX="157dp" />

    <Button
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Button"
        app:layout_constraintTop_toBottomOf="@+id/btn1"
        tools:layout_editor_absoluteX="132dp" />

    <Button
        android:id="@+id/btn3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="Button"
        app:layout_constraintTop_toBottomOf="@+id/btn2"
        tools:layout_editor_absoluteX="153dp" />

    <Button
        android:id="@+id/btnNext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginBottom="16dp"
        android:text="NEXT"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

▼MainActivity.kt

package com.example.fourquizkt

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.TextView
import androidx.appcompat.app.AlertDialog

class MainActivity : AppCompatActivity() {
    //2)タイトルの配列と、選択肢の2次配列(正解,選択肢1,選択肢2,選択肢3の順番)
    private val quizTitle = arrayOf("問題A","問題B","問題C","問題D")
    private val quizData = arrayOf(
        arrayOf("A0","A1","A2","A3"),
        arrayOf("B0","B1","B2","B3"),
        arrayOf("C0","C1","C2","C3"),
        arrayOf("D0","D1","D2","D3")
    )
    // 2)カウントの変数を用意
    private var i = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        //1)viewを取得(idで)
        val tvCount : TextView =findViewById(R.id.tvCount)
        val tvQuestion :TextView =findViewById(R.id.tvQuestion)
        val btn0:Button = findViewById(R.id.btn0)
        val btn1:Button = findViewById(R.id.btn1)
        val btn2:Button = findViewById(R.id.btn2)
        val btn3:Button = findViewById(R.id.btn3)
        val btnNext:Button=findViewById(R.id.btnNext)

        //3)カウント数と、最初の問題を表示
        tvCount.text = "あと4問"
        tvQuestion.text =quizTitle[0]

        //4)0~3までのリスト用意⇒シャッフル
        val list = listOf(0,1,2,3)
        val num = list.shuffled()

        //3)ボタンにquizDataを表示+NEXTボタンは無効化
        //5)シャッフルしたnumを表示
        btn0.text =quizData[0][num[0]]
        btn1.text =quizData[0][num[1]]
        btn2.text =quizData[0][num[2]]
        btn3.text =quizData[0][num[3]]
        btnNext.isEnabled =false

        //6)btn0を押した時の正誤判定
        btn0.setOnClickListener {
            if(btn0.text==quizData[i][0]){
                //正解
                correctAns()

            }else{
                //不正解
                incorrectAns()
            }
        }

        //10)btn1~3も同じようにする
        btn1.setOnClickListener {
            if(btn1.text==quizData[i][0]){
                //正解
                correctAns()
            }else{
                //不正解
                incorrectAns()
            }
        }

        btn2.setOnClickListener {
            if(btn2.text==quizData[i][0]){
                //正解
                correctAns()
            }else{
                //不正解
                incorrectAns()
            }
        }

        btn3.setOnClickListener {
            if(btn3.text==quizData[i][0]){
                //正解
                correctAns()
            }else{
                //不正解
                incorrectAns()
            }
        }

        //11)Nextボタンを押したらi問目
        btnNext.setOnClickListener {
            i++
            //もう1回シャッフル
            val numNext =list.shuffled()

            //i問目のタイトルと問題を表示
            tvCount.text ="あと" + (4-i) + "問"
            tvQuestion.text = quizTitle[i]
            btn0.text =quizData[i][numNext[0]]
            btn1.text =quizData[i][numNext[1]]
            btn2.text =quizData[i][numNext[2]]
            btn3.text =quizData[i][numNext[3]]
            //ボタンを有効化する
            btn0.isEnabled =true
            btn1.isEnabled =true
            btn2.isEnabled =true
            btn3.isEnabled =true
            btnNext.isEnabled =false
        }

    }

    //9)正解の関数
    private fun correctAns(){
        val btn0:Button = findViewById(R.id.btn0)
        val btn1:Button = findViewById(R.id.btn1)
        val btn2:Button = findViewById(R.id.btn2)
        val btn3:Button = findViewById(R.id.btn3)
        val btnNext:Button=findViewById(R.id.btnNext)

        //12)全問正解で結果画面へ
        if(i==3){
            val intent = Intent(this,ResultActivity::class.java)
            startActivity(intent)
            finish()
        }else{
            //8)正解アラートダイアログ
            AlertDialog.Builder(this)
                .setTitle("正解!")
                .setMessage(quizData[i][0])
                .setPositiveButton("OK",null)
                .show()

            btn0.isEnabled =false
            btn1.isEnabled =false
            btn2.isEnabled =false
            btn3.isEnabled =false
            btnNext.isEnabled =true
        }

    }

    //9)不正解の関数
    private fun incorrectAns(){
        val tvQuestion :TextView =findViewById(R.id.tvQuestion)
        val btn0:Button = findViewById(R.id.btn0)
        val btn1:Button = findViewById(R.id.btn1)
        val btn2:Button = findViewById(R.id.btn2)
        val btn3:Button = findViewById(R.id.btn3)
        val btnNext:Button=findViewById(R.id.btnNext)

        //7)不正解+ボタンの無効化
        tvQuestion.text ="不正解!!Game Over"
        btn0.isEnabled =false
        btn1.isEnabled =false
        btn2.isEnabled =false
        btn3.isEnabled =false
        btnNext.isEnabled =false
    }
}

▼activity_result.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"
    android:background="#FFEB3B"
    tools:context=".ResultActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="全問正解!Game Clear!"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

▼ResultActivity.kt

package com.example.fourquizkt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class ResultActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_result)
    }
}

 

テキスト解説

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