CH02 챌린지 all clear

1. 리스너를 TextView에 추가한다.

2. 이전 버튼을 추가한다.

mCurrentIndex += 2;

mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;

3. Button에서 ImageButton으로 변경한다.

QuizActivity.java

package com.bignerdranch.android.geoquiz;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
 
 
public class QuizActivity extends Activity {
 
    private Button mTrueButton;
    private Button mFalseButton;
    private ImageButton mNextButton;
    private ImageButton mPrevButton;
    private TextView mQuestionTextView;
    private int mCurrentIndex = 0;
 
    private TrueFalse[] mQuestionBank = new TrueFalse[]{
        new TrueFalse(R.string.question_africa, false),
        new TrueFalse(R.string.question_oceans, true),
        new TrueFalse(R.string.question_asia, true),
        new TrueFalse(R.string.question_mideast, false)
    };
 
    private void updateQuestion(){
        int question = mQuestionBank[mCurrentIndex].getQuestion();
        mQuestionTextView.setText(question);
    }
 
    private void checkAnswer(boolean userPressedTrue){
        boolean answerIsTrue = mQuestionBank[mCurrentIndex].isTrueQuestion();
        int messageResId = 0;
        if(userPressedTrue == answerIsTrue) {
            messageResId = R.string.correct_toast;
        } else {
            messageResId = R.string.incorrect_toast;
        }
 
        Toast.makeText(this, messageResId, Toast.LENGTH_SHORT).show();
    }
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_quiz);
 
        mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
        mQuestionTextView.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                mCurrentIndex = (mCurrentIndex+1)%mQuestionBank.length;
                updateQuestion();
            }
        });
 
        mTrueButton = (Button) findViewById(R.id.true_button);
        mTrueButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkAnswer(true);
            }
        });
 
        mFalseButton = (Button) findViewById(R.id.false_button);
        mFalseButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkAnswer(false);
            }
        });
 
        mNextButton = (ImageButton) findViewById(R.id.next_button);
        mNextButton.setBackgroundResource(android.R.drawable.ic_media_next);
        mNextButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
                updateQuestion();
            }
        });
 
        mPrevButton = (ImageButton) findViewById(R.id.prev_button);
        mPrevButton.setBackgroundResource(android.R.drawable.ic_media_previous);
        mPrevButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCurrentIndex += 2;
                mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
                updateQuestion();
            }
        });
 
        updateQuestion();
 
    }
}
 
 

activity_quiz.xml

 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical" >
    
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="24dp"
        android:id="@+id/question_text_view" />
 
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">        
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/true_button"
            android:text="@string/true_button"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/false_button"
            android:text="@string/false_button"/>
    </LinearLayout>
 
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >
        <ImageButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/prev_button"
            />
        <ImageButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/next_button"
            />
    </LinearLayout>
</LinearLayout>

TrueFalse.java

package com.bignerdranch.android.geoquiz;
 
/**
 * Created by NAYEON on 2015-06-18.
 */
public class TrueFalse {
 
    private int mQuestion;
    private boolean mTrueQuestion;
 
    public TrueFalse(int question, boolean trueQuestion){
        mQuestion = question;
        mTrueQuestion = trueQuestion;
    }
 
    public int getQuestion() {
        return mQuestion;
    }
 
    public void setQuestion(int question) {
        mQuestion = question;
    }
 
    public boolean isTrueQuestion() {
        return mTrueQuestion;
    }
 
    public void setTrueQuestion(boolean trueQuestion) {
        mTrueQuestion = trueQuestion;
    }
}