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);
}
}