Java 阵列正在被擦除 所以我正面临着一本我正在读的书的挑战。挑战是我向应用程序的用户提问,他们应该回答正确或错误。他们也可以选择作弊,但当他们回到问题时,答案一定不能被接受。 所以我创建了一个布尔数组,保存“骗子”的状态。如果他作弊就对,如果他不作弊就错。但是,在一个完整的问题轮换之后,数组被擦除。为什么会这样?我做错了什么
以下是我参加测验活动的主要代码:Java 阵列正在被擦除 所以我正面临着一本我正在读的书的挑战。挑战是我向应用程序的用户提问,他们应该回答正确或错误。他们也可以选择作弊,但当他们回到问题时,答案一定不能被接受。 所以我创建了一个布尔数组,保存“骗子”的状态。如果他作弊就对,如果他不作弊就错。但是,在一个完整的问题轮换之后,数组被擦除。为什么会这样?我做错了什么,java,android,arrays,Java,Android,Arrays,以下是我参加测验活动的主要代码: public class QuizActivity extends Activity { private Button mTrueButton; private Button mFalseButton; private Button mNextButton; private Button mCheatButton; private TextView mQuestionTextView; private static final String TAG = "Qu
public class QuizActivity extends Activity {
private Button mTrueButton;
private Button mFalseButton;
private Button mNextButton;
private Button mCheatButton;
private TextView mQuestionTextView;
private static final String TAG = "QuizActivity";
private static final String KEY_INDEX = "index";
private static final String CHEATER_BOOLEAN = "cheat";
private TrueFalse[] mQuestionBank = new TrueFalse[] {
new TrueFalse(R.string.question_oceans, true),
new TrueFalse(R.string.question_mideast, false),
new TrueFalse(R.string.question_africa, false),
new TrueFalse(R.string.question_americas, true),
new TrueFalse(R.string.question_asia, true),
};
private boolean[] mCheatBank = new boolean[mQuestionBank.length];
private int mCurrentIndex = 0;
private boolean mIsCheater;
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(mIsCheater) {
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();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "onCreate(Bundle) called");
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;
mIsCheater = false;
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 = (Button)findViewById(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
mIsCheater = mCheatBank[mCurrentIndex];
updateQuestion();
}
});
mCheatButton = (Button)findViewById(R.id.cheat_button);
mCheatButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(QuizActivity.this,CheatActivity.class);
boolean answerIsTrue = mQuestionBank[mCurrentIndex].isTrueQuestion();
i.putExtra(CheatActivity.EXTRA_ANSWER_IS_TRUE, answerIsTrue);
startActivityForResult(i,0);
}
});
if (savedInstanceState != null) {
mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
mIsCheater = savedInstanceState.getBoolean(CHEATER_BOOLEAN, false);
}
updateQuestion();
} // End of onCreate(Bundle) method
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.d(TAG,"onActivityResult called");
if (data == null) {
return;
}
mIsCheater = data.getBooleanExtra(CheatActivity.EXTRA_ANSWER_SHOWN, false);
mCheatBank[mCurrentIndex] = mIsCheater;
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
Log.d(TAG, "onSaveInstanceState");
savedInstanceState.putInt(KEY_INDEX, mCurrentIndex);
savedInstanceState.putBoolean(CHEATER_BOOLEAN, mIsCheater);
}
编辑1:这是其他类的代码,因为有人问
作弊活动代码:
public class CheatActivity extends Activity {
public static final String EXTRA_ANSWER_IS_TRUE = "com.bignerrandch.android.geoquiz.answer_is_true";
public static final String EXTRA_ANSWER_SHOWN = "com.bignerdranch.android.geoquiz.answer_shown";
private boolean mAnswerIsTrue;
private boolean mCheater;
private TextView mAnswerTextView;
private Button mShowAnswer;
private void setAnswerShownResult(boolean isAnswerShown) {
Intent data = new Intent();
data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);
mAnswerTextView = (TextView)findViewById(R.id.answerTextView);
mCheater = false;
if (savedInstanceState != null) {
mCheater = savedInstanceState.getBoolean(EXTRA_ANSWER_SHOWN, false);
setAnswerShownResult(mCheater);
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button);
}
else {
mAnswerTextView.setText(R.string.false_button);
}
} else {
setAnswerShownResult(false);
}
mShowAnswer = (Button)findViewById(R.id.showAnswerButton);
mShowAnswer.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);
}
setAnswerShownResult(true);
mCheater = true;
}
});
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putBoolean(EXTRA_ANSWER_SHOWN, mCheater);
}
}
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;
}
}
TrueFalse代码:
public class CheatActivity extends Activity {
public static final String EXTRA_ANSWER_IS_TRUE = "com.bignerrandch.android.geoquiz.answer_is_true";
public static final String EXTRA_ANSWER_SHOWN = "com.bignerdranch.android.geoquiz.answer_shown";
private boolean mAnswerIsTrue;
private boolean mCheater;
private TextView mAnswerTextView;
private Button mShowAnswer;
private void setAnswerShownResult(boolean isAnswerShown) {
Intent data = new Intent();
data.putExtra(EXTRA_ANSWER_SHOWN, isAnswerShown);
setResult(RESULT_OK, data);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cheat);
mAnswerIsTrue = getIntent().getBooleanExtra(EXTRA_ANSWER_IS_TRUE, false);
mAnswerTextView = (TextView)findViewById(R.id.answerTextView);
mCheater = false;
if (savedInstanceState != null) {
mCheater = savedInstanceState.getBoolean(EXTRA_ANSWER_SHOWN, false);
setAnswerShownResult(mCheater);
if (mAnswerIsTrue) {
mAnswerTextView.setText(R.string.true_button);
}
else {
mAnswerTextView.setText(R.string.false_button);
}
} else {
setAnswerShownResult(false);
}
mShowAnswer = (Button)findViewById(R.id.showAnswerButton);
mShowAnswer.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);
}
setAnswerShownResult(true);
mCheater = true;
}
});
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
savedInstanceState.putBoolean(EXTRA_ANSWER_SHOWN, mCheater);
}
}
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;
}
}
还不完全清楚你所说的擦拭是什么意思。但我认为您的问题是,您正在使用一个成员变量来设置数组值。因此,将数组的每个元素都设置为该值。因此,基本上整个数组将被设置为mIsCheater的最终状态。你在读哪本书P只是出于好奇的机器人编程-比尔·菲利普斯和布赖恩·哈迪的《大书呆子牧场指南》。你能解释一下吗
,但是在一次完整的问题轮换之后,数组被删除了?这是你所有的源代码吗?任何其他的门廊都可以。如果作弊者按下作弊按钮,让我们在第一个问题上说,他的答案是不可接受的,他会得到“敬酒”。但是,如果他按下“下一步”按钮,浏览所有问题并首先返回,那么他可以毫无问题地回答问题。mCheatBank
数组是一个boolean[]
,这意味着它的值是基元,而不是对象引用。