Calculated game app released on Google play store

Published on Google play store. https://play.google.com/store/apps/details?id=com.nyaa.braintrainer

If you are using an Android smartphone, I would be happy if you could play with it.

Also, I had you review the code and modified the source code a little. I also added notes and deleted notes for learning.

Original source code https://qiita.com/KToushi/items/6e1a369111e904a6a22f

//playaAgainボタンを押したときの挙動を定義 public void playAgain(View view) { score = 0; numberOfQusetions = 0; timerTextview.setText("15s"); scoreTextView.setText("0/0");

・ ・ ・

new CountDownTimer(15100, 1000) {

//CountDownTimerクラスのメソッドを上書き @Override //カウントダウンしている間の挙動 public void onTick(long millisUntilFinished) {

//残り何秒か表示 timerTextview.setText(String.valueOf(millisUntilFinished / 1000) + "s");

    }

・ ・ ・ public void newQuetion() {

//インスタンス生成 // Class name variable = new class name (); Random rand = new Random();

// Define integer variables a and b Randomly assign 21 integers from 0 to 20 int a = rand.nextInt(21); int b = rand.nextInt(21);

sumTextView.setText(Integer.toString(a)+ " + " + Integer.toString(b));

// Randomly assign 4 types of integers from 0 to 3 Tag is also 4 types from 0 to 3 locationOfCorrectAnswer = rand.nextInt(4); //answersリストの中身(4つの答え)を消去 answers.clear();

for(int i=0; i<4; i++) { if(i==locationOfCorrectAnswer) { answers.add(a+b); } else { // Randomly assign 41 integers from 0 to 40 (since a and b contain integers from 0 to 20 respectively, minimum 0 + 0 maximum 20 + 20) int wrongAnswer = rand.nextInt(41);

//wrongAnswerが正解と一緒の場合、再び0から40の41通りの整数をランダムに代入 while(wrongAnswer == a+b) { wrongAnswer = rand.nextInt(41);

If you write numerical values such as 15,15100,1000,4,21,41 directly in the method, it will be difficult to find the relevant part when you want to correct it later. First, I decided to declare them as constants ↓

//ゲーム開始時のカウントダウンタイマーの残り時間を表す定数 final int remainingTime = 16; //カウントダウンタイマーのカウントダウンの間隔を表す定数 final int countDownInterval = 1000;

//選択肢の数 final int numberOfTags = 4; //(問題に使うランダムな数が)何通りあるか final int numberOfWays = 20;

Whole source code ↓

package com.nyaa.braintrainer;

import androidx.appcompat.app.AppCompatActivity; import androidx.constraintlayout.widget.ConstraintLayout;

import android.media.MediaPlayer; import android.os.Bundle; import android.os.CountDownTimer; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import java.util.ArrayList; import java.util.Random;

import static android.media.MediaPlayer.create;

public class MainActivity extends AppCompatActivity {

//ゲームを開始するボタン Button goButton; //残り時間、問題、得点/問題数、4つの選択肢(ボタン) ConstraintLayout gameLayout;

Button playAgainButton;

TextView resultTextView;
TextView commentTextView;
TextView timerTextview;
int score = 0;
int numberOfQusetions = 0;

//猫画像 ImageView imageNirami; ImageView imageKakure; ImageView imageYousumi;

//ゲーム開始時のカウントダウンタイマーの残り時間を表す定数 final int remainingTime = 16; //カウントダウンタイマーのカウントダウンの間隔を表す定数 final int countDownInterval = 1000;

ArrayList<Integer> answers = new ArrayList<Integer>();

//正解の位置(ボタン)のtag int locationOfCorrectAnswer; //選択肢の数 final int numberOfTags = 4; //(問題に使うランダムな数が)何通りあるか final int numberOfWays = 20;

TextView scoreTextView;
TextView sumTextView;
Button button0, button1, button2, button3;

//Goボタンを押したときの挙動(ゲームをスタートさせる)を定義 public void start(View view) {

//goボタンが消える goButton.setVisibility(View.INVISIBLE);

//残り時間、問題、得点/問題数、4つの選択肢(ボタン)を出現させる gameLayout.setVisibility(View.VISIBLE);

//playAgainButtonを押した時と同じ挙動をする playAgain(findViewById(R.id.timerTextView));

}

//playaAgainボタンを押したときの挙動を定義 public void playAgain(View view) { score = 0; numberOfQusetions = 0;

//残り何秒か表示 timerTextview.setText(remainingTime + "s");

//何問中何問正解しているか表示 scoreTextView.setText("0/0");

//新しい問題と選択肢を表示 newQuetion();

//resultTextViewを見えるようにする resultTextView.setVisibility(View.VISIBLE);

//commentTextViewを見えなくする commentTextView.setVisibility(View.INVISIBLE);

//playAgainButtonを見えなくする playAgainButton.setVisibility(View.INVISIBLE);

//猫の画像見えなくする imageNirami.setVisibility(View.INVISIBLE); imageYousumi.setVisibility(View.INVISIBLE); imageKakure.setVisibility(View.INVISIBLE);

    resultTextView.setText("");

//4つのボタン(選択肢)出現 buttonShow();

//カウントダウンタイマーをスタートさせる new CountDownTimer(remainingTime * 1000, countDownInterval) {

//CountDownTimerクラスのメソッドを上書き @Override //カウントダウンしている間の挙動 public void onTick(long millisUntilFinished) {

//残り何秒か表示 timerTextview.setText(String.valueOf(millisUntilFinished / 1000) + "s");

        }

        @Override

//カウントダウンが0になった時の挙動 public void onFinish() { MediaPlayer mediaPlayer;

//4つのボタン(選択肢)を見えなくする buttonHide();

            resultTextView.setVisibility(View.INVISIBLE);
            commentTextView.setVisibility(View.VISIBLE);

//得点によって表示される画像とテキスト、効果音を変える if(score > 9) { commentTextView.setText ("I'll praise you //");

//隠れ猫表示 imageKakure.setVisibility(View.VISIBLE);

//効果音キラキラが鳴る mediaPlayer = create(getApplicationContext(), R.raw.shine1); mediaPlayer.start();

            } else if(score > 5) {

commentTextView.setText ("Hmm, ok");

//様子見猫表示 imageYousumi.setVisibility(View.VISIBLE);

//効果音シャキーン!が鳴る mediaPlayer = create(getApplicationContext(), R.raw.shakin1); mediaPlayer.start();

            } else {

commentTextView.setText ("Are you motivated?");

//にらみ猫表示 imageNirami.setVisibility(View.VISIBLE);

//効果音チーンが鳴る mediaPlayer = create(getApplicationContext(), R.raw.tin1); mediaPlayer.start();

            }

//playAgainButton出現 playAgainButton.setVisibility(View.VISIBLE);

        }

    }.start();

}

//4種類のボタンを押したときの挙動(メソッド)を定義 public void chooseAnswer(View view) {

//正解のタグと押したタグが同じとき(4つのボタンに0~3の4種類のタグを設定している) if (Integer.toString(locationOfCorrectAnswer).equals(view.getTag().toString())) { resultTextView.setText ("correct answer");

//得点が1増える score++;

    } else {

resultTextView.setText ("wrong");

    }

//現在の問題数が1増える numberOfQusetions++;

//何問中何問正解しているか表示 scoreTextView.setText(Integer.toString(score) + "/" + Integer.toString(numberOfQusetions));

//新しい問題と選択肢を表示 newQuetion(); }

//新しい問題を出現させるメソッドを定義 public void newQuetion() {

    Random rand = new Random();

// Define integer variables a and b Randomly assign integers from 0 to numberOfWays (numberOfWays + 1) int a = rand.nextInt(numberOfWays); int b = rand.nextInt(numberOfWays);

// Show a + b sumTextView.setText(Integer.toString(a)+ " + " + Integer.toString(b));

// Randomly assign 4 types of integers from 0 to 3 Tag is also 4 types from 0 to 3 locationOfCorrectAnswer = rand.nextInt(numberOfTags); //answersリストの中身(4つの答え)を消去 answers.clear();

    for(int i=0; i<4; i++) {
        if(i == locationOfCorrectAnswer) {

// Add correct answer (a + b) to anserws list answers.add(a+b); } else { // 0 to numberOfWays * 2 numberOfWays * 2 -1 random integers are assigned int wrongAnswer = rand.nextInt(numberOfWays * 2 -1);

// While wrongAnswer is the same as the correct answer, randomly assign a numberOfWays * 2 -1 integer from 0 to numberOfWays * 2. while(wrongAnswer == a+b) { wrongAnswer = rand.nextInt(numberOfWays * 2 -1);

            }

//answersリストに間違った答えを追加 answers.add(wrongAnswer); }

    }

    button0.setText(Integer.toString(answers.get(0)));
    button1.setText(Integer.toString(answers.get(1)));
    button2.setText(Integer.toString(answers.get(2)));
    button3.setText(Integer.toString(answers.get(3)));
}

//4つのボタン(選択肢)を見えるようにするメソッドを定義 public void buttonShow() { button0.setVisibility(View.VISIBLE); button1.setVisibility(View.VISIBLE); button2.setVisibility(View.VISIBLE); button3.setVisibility(View.VISIBLE); }

//4つのボタン(選択肢)を見えなくするメソッドを定義 public void buttonHide(){ button0.setVisibility(View.INVISIBLE); button1.setVisibility(View.INVISIBLE); button2.setVisibility(View.INVISIBLE); button3.setVisibility(View.INVISIBLE); }

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

//それぞれlayoutのViewと紐づけ goButton = findViewById(R.id.goButton); sumTextView = findViewById(R.id.sumTextView); button0 = findViewById(R.id.button0); button1 = findViewById(R.id.button1); button2 = findViewById(R.id.button2); button3 = findViewById(R.id.button3); resultTextView = findViewById(R.id.resultTextView); commentTextView = findViewById(R.id.commentTextView); scoreTextView = findViewById(R.id.scoreTextView); timerTextview = findViewById(R.id.timerTextView); playAgainButton = findViewById(R.id.playAgainButton); gameLayout = findViewById(R.id.gameLayout); imageNirami = findViewById(R.id.nirami); imageKakure = findViewById(R.id.kakure); imageYousumi = findViewById(R.id.yousumi);

    goButton.setVisibility(View.VISIBLE);

}

}

Layout ↓

<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">

<Button
    android:id="@+id/goButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:backgroundTint="@android:color/holo_green_dark"
    android:onClick="start"
    android:padding="40dp"
    android:text="GO!"
    android:textSize="60sp"
    android:visibility="invisible"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<ImageView
    android:id="@+id/kakure"
    android:layout_width="474dp"
    android:layout_height="900dp"
    android:visibility="invisible"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:srcCompat="@drawable/konekokakure" />

<ImageView
    android:id="@+id/yousumi"
    android:layout_width="409dp"
    android:layout_height="738dp"
    android:visibility="invisible"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:srcCompat="@drawable/nekoyousumi" />

<ImageView
    android:id="@+id/nirami"
    android:layout_width="375dp"
    android:layout_height="245dp"
    android:visibility="invisible"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:srcCompat="@drawable/nekonirami" />

<androidx.constraintlayout.widget.ConstraintLayout
    android:id="@+id/gameLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:visibility="invisible">


    <TextView
        android:id="@+id/timerTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:background="@android:color/holo_orange_dark"
        android:text="30s"
        android:textSize="30sp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/scoreTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:background="@android:color/holo_blue_dark"
        android:padding="10dp"
        android:text="0/0"
        android:textSize="25sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/sumTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:padding="15dp"
        android:text="31 + 7"
        android:textSize="40dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TableLayout
        android:id="@+id/TableLayout"
        android:layout_width="330dp"
        android:layout_height="350dp"
        android:layout_marginTop="60dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TableRow
            android:id="@+id/TableRow1"
            android:layout_width="match_parent"
            android:layout_height="258dp">

            <Button
                android:id="@+id/button0"
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:layout_row="0"
                android:layout_column="0"
                android:layout_columnWeight="1"
                android:layout_gravity="fill"
                android:layout_weight="1"
                android:background="@android:color/holo_red_light"
                android:onClick="chooseAnswer"
                android:tag="0"
                android:text="14"
                android:textSize="80sp" />

            <Button
                android:id="@+id/button1"
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:layout_row="0"
                android:layout_column="1"
                android:layout_columnWeight="1"
                android:layout_gravity="fill"
                android:layout_weight="1"
                android:background="@android:color/holo_purple"
                android:onClick="chooseAnswer"
                android:tag="1"
                android:text="14"
                android:textSize="80sp" />

        </TableRow>

        <TableRow
            android:id="@+id/TableRow2"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <Button
                android:id="@+id/button2"
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:layout_row="1"
                android:layout_column="0"
                android:layout_columnWeight="1"
                android:layout_gravity="fill"
                android:layout_weight="1"
                android:background="@android:color/holo_blue_dark"
                android:onClick="chooseAnswer"
                android:tag="2"
                android:text="14"
                android:textSize="80sp" />

            <Button
                android:id="@+id/button3"
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:layout_row="1"
                android:layout_column="1"
                android:layout_columnWeight="1"
                android:layout_gravity="fill"
                android:layout_weight="1"
                android:background="@android:color/holo_green_dark"
                android:onClick="chooseAnswer"
                android:tag="3"
                android:text="14"
                android:textSize="80sp" />
        </TableRow>


    </TableLayout>

    <TextView
        android:id="@+id/resultTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="45dp"
        android:text="Correct!"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/commentTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="45dp"
        android:text="TextView"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/playAgainButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="10dp"
        android:onClick="playAgain"
        android:text="play again"
        android:visibility="invisible"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/resultTextView" />

</androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

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