Chapter 5 First Challenge

I guess it’s self-explanatory. I tried to do the three challenges in Chapter 5. However, my code works well with the second and third challenge. If I go back to QuizActivity and rotate the screen after I have cheated, GeoQuiz still remembers it. However, it doesn’t remember when I rotate the screen during CheatActivity after I have cheated. Here is the code.

QUIZ ACTIVITY

package com.bignerdranch.android.geoquiz;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class QuizActivity extends AppCompatActivity {

private static final String TAG = "QuizActivity";
private static final String KEY_INDEX = "index";
private static final String ANSWER_SHOWN = "show";
private static final int REQUEST_CODE_CHEAT = 0;

private Button mTrueButton;
private Button mFalseButton;
private Button mNextButton;
private Button mCheatButton;
private TextView mQuestionTextView;

private Question[] mQuestionBank = new Question[] {
        new Question(R.string.question_australia, true),
        new Question(R.string.question_oceans, true),
        new Question(R.string.question_mideast, false),
        new Question(R.string.question_africa, false),
        new Question(R.string.question_americas, true),
        new Question(R.string.question_asia, true),
};

private boolean[] mQuestionAnswered = {false, false, false, false, false ,false};

private int mCurrentIndex = 0;
private boolean mIsCheater;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.d(TAG, "onCreate(Bundle) called");
    setContentView(R.layout.activity_quiz);

    if (savedInstanceState != null) {
        mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
        mIsCheater = savedInstanceState.getBoolean(ANSWER_SHOWN, false);
        mQuestionAnswered = savedInstanceState.getBooleanArray(ANSWER_SHOWN);
    }

    mQuestionTextView = (TextView) findViewById(R.id.question_text_view);

    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 = (Button) findViewById(R.id.next_button);
    mNextButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
            mIsCheater = false;
            updateQuestion();
        }
    });

    mCheatButton = (Button) findViewById(R.id.cheat_button);
    mCheatButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
            Intent intent = CheatActivity.newIntent(QuizActivity.this, answerIsTrue);
            startActivityForResult(intent, REQUEST_CODE_CHEAT);
        }
    });

    updateQuestion();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode != Activity.RESULT_OK) {
        return;
    }

    if (requestCode == REQUEST_CODE_CHEAT) {
        if (data == null) {
            return;
        }
        mIsCheater = CheatActivity.wasAnswerShown(data);
        mQuestionAnswered[mCurrentIndex] = CheatActivity.wasAnswerShown(data);
    }
}

@Override
protected void onStart() {
    super.onStart();
    Log.d(TAG, "onStart() called");
}

@Override
protected void onResume() {
    super.onResume();
    Log.d(TAG, "onResume() called");
}

@Override
protected void onPause() {
    super.onPause();
    Log.d(TAG, "onPause() called");
}

@Override
protected void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    Log.i(TAG, "onSaveInstanceState");
    savedInstanceState.putInt(KEY_INDEX, mCurrentIndex);
    savedInstanceState.putBoolean(ANSWER_SHOWN, mIsCheater);
    savedInstanceState.putBooleanArray(ANSWER_SHOWN, mQuestionAnswered);
}

@Override
protected void onStop() {
    super.onStop();
    Log.d(TAG, "onStop() called");
}

@Override
protected void onDestroy() {
    super.onDestroy();
    Log.d(TAG, "onDestroy() called");
}

private void updateQuestion() {
    int question = mQuestionBank[mCurrentIndex].getTextResId();
    mQuestionTextView.setText(question);
}

private void checkAnswer(boolean userPressedTrue) {
    boolean answerIsTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
    boolean userCheated = mQuestionAnswered[mCurrentIndex];

    int messageResId = 0;

    if (mIsCheater || userCheated) {
        messageResId = R.string.judgment_toast;
    } else {
        if (userPressedTrue == answerIsTrue) {
            messageResId = R.string.correct_toast;
        } else {
            messageResId = R.string.incorrect_toast;
        }
    }

    Toast.makeText(this, messageResId, Toast.LENGTH_SHORT)
            .show();


}

}

CHEAT ACTIVITY

package com.bignerdranch.android.geoquiz;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class CheatActivity extends AppCompatActivity {

private static final String EXTRA_ANSWER_IS_TRUE =
        "com.bignerdranch.android.geoquiz.answer_is_true";
private static final String EXTRA_ANSWER_SHOWN =
        "com.bignerdranch.android.geoquiz.answer_shown";
private static final String KEY_ANSWER_SHOWN =
        "answer is shown";

private boolean mAnswerIsTrue;
private TextView mAnswerTextView;
private Button mShowAnswerButton;
private boolean mAnswerIsShown;

public static Intent newIntent(Context packageContext, boolean answerIsTrue) {
    Intent intent = new Intent(packageContext, CheatActivity.class);
    intent.putExtra(EXTRA_ANSWER_IS_TRUE, answerIsTrue);
    return intent;
}

public static boolean wasAnswerShown (Intent result) {
    return result.getBooleanExtra(EXTRA_ANSWER_SHOWN, false);
}

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

    if (savedInstanceState != null) {
        mAnswerIsShown = savedInstanceState.getBoolean(KEY_ANSWER_SHOWN, false);
    }

    mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);

    mAnswerTextView = (TextView) findViewById(R.id.answer_text_view);

    mShowAnswerButton = (Button) findViewById(R.id.show_answer_button);
    mShowAnswerButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mAnswerIsTrue) {
                mAnswerTextView.setText(R.string.true_button);
            } else {
                mAnswerTextView.setText(R.string.false_button);
            }
            mAnswerIsShown = true;
            setAnswerShownResult(mAnswerIsShown);
        }
    });
}

private void setAnswerShownResult(boolean isAnswerShown) {
    Intent data = new Intent();
    data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
    setResult(RESULT_OK, data);
}

@Override
protected void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    savedInstanceState.putBoolean(KEY_ANSWER_SHOWN, mAnswerIsShown);
}

}