9.2 quiz app / MVC / string data들 add / 코딩

https://velog.io/@jojo_devstory/안드로이드-아키텍쳐-패턴-MVC가-뭘까 

 

MVC : model - view -controller  ......design pattern같은 

         model : sort of data 

 

예시) Quiz app의 MVC

model : quiz(question).................question class - java class(main activity ->new class)

view  : ImageView  TextView Buttons...............activity_main.xml?

conteroller : MainActivity...........출력()

M : quextion class 만들기

C : string들 question add(array) - call constructor(=setter)

V : showing 

    (> another next button

       or ImageButton 추가 : 보통 contentDescription도 같이 추가: 해당 이미지 버튼이 뭔지 설명해주는

    >버튼 누르면 question나오게 설정)

 

>Index = (Index+1)%array.length : 마지막 index도달하면 다시 0 index로 돌아간다 : keep going inside.

1%8....1

2%8....2

8%8....0-> 원래 시작점으로 돌아감.

 

currentQuestionIndex=(currentQuestionIndex + 1) % questionBank.length; // 무한반복

 

 

1. M : quextion class 만들기

package com.example.truecitizenquiz;

public class Question {
    private int answerResId;            //variables
    private boolean answerTrue;

    public Question(int answerResId, boolean answerTrue) {      //constructor
        this.answerResId = answerResId;
        this.answerTrue = answerTrue;
    }

                                                    //getter and seeter
    public int getAnswerResId() {
        return answerResId;
    }

    public void setAnswerResId(int answerResId) {
        this.answerResId = answerResId;
    }

    public boolean isAnswerTrue() {
        return answerTrue;
    }

    public void setAnswerTrue(boolean answerTrue) {
        this.answerTrue = answerTrue;
    }
}

2.  C : string들 question add(array) - call constructor(=setter)

V : showing 

 

<sting xml>에 string data 추가

<resources>
    <string name="app_name">TrueCitizenQuiz</string>
    <string name="question_declaration">The Declaration of Independance was Adpoted in 1776</string>
    <string name="true_text">true</string>
    <string name="false_text">false</string>
    <string name="correct_answer">That\'s correct</string>
    <string name="wrong_answer">That\'s incorrect</string>
    <string name="question_constitution">The Supreme law of the land is the Constitution.</string>
    <string name="question_amendments">The (U.S.) Constitution has 26 Amendments.</string>
    <string name="question_independence_rights">The two rights in the Declaration of Independence are:
        \n \t <b>life</b> \n  \t <b>pursuit of happiness</b>.</string>
    <string name="question_religion">Freedom of religion means:
        \n \t <b>You can practice any religion, or not practice a religion</b>.</string>
    <string name="question_government">Journalists is one branch or part of the government.</string>
    <string name="question_government_feds">Congress does not make federal laws.</string>
    <string name="question_government_senators">There are one hundred (100) U.S. Senators.</string>
    <string name="next_text">next</string>

</resources>

MainActivity (string array defind/ imagebutton xml showing)

 

package com.example.truecitizenquiz;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener { //implement설정됨.

    private Button falseButton;
    private Button trueButton;
    private TextView questionTextView;           //variable 설정    V
    private ImageButton nextButton;             // V

    private int currentQuestionIndex = 0;       // V

    private Question[] questionBank = new Question[]{       // Array define in android studio    V

            new Question(R.string.question_amendments,false),   //call constructor=setter
            new Question(R.string.question_constitution,true),
            new Question(R.string.question_declaration,true),
            new Question(R.string.question_independence_rights,true),
            new Question(R.string.question_religion,true),
            new Question(R.string.question_government,false),
            new Question(R.string.question_government_feds,false),
            new Question(R.string.question_government_senators,true),

    };

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

        falseButton = findViewById(R.id.false_button);      // xml 연결
        trueButton = findViewById(R.id.true_button);
        questionTextView =findViewById(R.id.answer_text_view);
        nextButton = findViewById(R.id.next_button);                //      V

        falseButton.setOnClickListener(this);           //click 한다면 this로 -> make implement 클릭
        trueButton.setOnClickListener(this);
        nextButton.setOnClickListener(this);            //  V
    }

    @Override                               //click시 method(->this) implement 설정.
    public void onClick(View view) {
        switch(view.getId()){                  //ID가 있다면
            case R.id.false_button:
                Toast.makeText(MainActivity.this,"False",Toast.LENGTH_SHORT).show();
                break;

            case R.id.true_button:
                Toast.makeText(MainActivity.this, "true", Toast.LENGTH_SHORT).show();

            case R.id.next_button:                          //     V
                //go to next question
                currentQuestionIndex=(currentQuestionIndex + 1) % questionBank.length; // 무한반복
                Log.d("Current","onClick : "+currentQuestionIndex);
                questionTextView.setText(questionBank[currentQuestionIndex].getAnswerResId());
        }
    }

}

index 7 다음에 다시 index 0으로 

 

3. 참고 ImageButton 추가한거 ... main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity"
    tools:ignore="ExtraText"
    android:background="@color/colorPrimaryDark">

    <ImageView
        android:src="@drawable/ic_launcher_foreground"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

    <TextView
        android:id="@+id/answer_text_view"
        android:text="@string/question_declaration"
        android:textColor="@android:color/white"
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="8dp" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="34dp"
        android:orientation="horizontal">
        <Button
            android:id="@+id/true_button"
            android:text="@string/true_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <Button
            android:id="@+id/false_button"
            android:text="@string/false_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

                                            <!-- 이미지 버튼 추가   V-->
    <ImageButton
        android:contentDescription="@string/next_text"
        android:id="@+id/next_button"
        android:src="@android:drawable/ic_media_next"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>