我正在创建一个 Android 测验应用程序。我有这个程序的三个 .java 文件：TrueFalse.java、QuizActivity.java 和 Quiz.java，所有这些文件一起运行以运行应用程序。
我遇到的问题是我试图在测验完成后显示用户的分数。我的代码没有这样做。
这是我的 TrueFalse.java 代码：
package com.example.quiz;
public class TrueFalse {
public static final int NO_ANSWER = 1;
public static final int TRUE_ANSWER = 2;
public static final int FALSE_ANSWER = 3;
private int mQuestion;
private boolean mTrueQuestion;
private int mUserAnswer;
public TrueFalse(int question, boolean trueQuestion){
mQuestion = question;
mTrueQuestion = trueQuestion;
mUserAnswer = NO_ANSWER;
}
public boolean getAnswerRight() {
switch (mUserAnswer){
case TRUE_ANSWER:
return mTrueQuestion;
case FALSE_ANSWER:
return !mTrueQuestion;
}
return false;
}
public void setAnswer(boolean answer) {
mUserAnswer = answer ? TRUE_ANSWER : FALSE_ANSWER;
}
public boolean isQuestionAnswered(){
return mUserAnswer != NO_ANSWER;
}
public int getQuestion(){
return mQuestion;
}
}
这是我的 QuizActivity.java 代码：
package com.example.quiz;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class QuizActivity extends Activity {
private Button mTrueButton;
private Button mFalseButton;
private Button mPreButton;
private Button mNextButton;
private Button mQuitButton;
private TextView mMessage;
private Quiz mQuiz=new Quiz(new TrueFalse[]{
new TrueFalse(R.string.message, true),
new TrueFalse(R.string.message2, true),
new TrueFalse(R.string.message3, true)
});
private int mCurrentQuestion = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
mTrueButton = (Button)findViewById(R.id.true_button);
mFalseButton = (Button)findViewById(R.id.false_button);
mMessage = (TextView)findViewById(R.id.message_box);
mPreButton=(Button)findViewById(R.id.pre_button);
mNextButton=(Button)findViewById(R.id.next_button);
mQuitButton=(Button)findViewById(R.id.quit_button);
mMessage.setText(mQuiz.getQuestions()[mCurrentQuestion].getQuestion());
mTrueButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
showAnswer(true);
}
});
mFalseButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
showAnswer(false);
}
});
mPreButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
QuizActivity.this.mQuiz.preButton();
updateButtonVisibility();
QuizActivity.this.mMessage.setText(QuizActivity.this.mQuiz.getCurrentQuestion().getQuestion());
}
});
mNextButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
QuizActivity.this.mQuiz.nextButton();
updateButtonVisibility();
QuizActivity.this.mMessage.setText(QuizActivity.this.mQuiz.getCurrentQuestion().getQuestion());
}
});
mQuitButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
finish();
}
});
}
public void updateButtonVisibility(){
if (mQuiz.getCurrentQuestion().isQuestionAnswered()){
mTrueButton.setVisibility(View.INVISIBLE);
mFalseButton.setVisibility(View.INVISIBLE);
}
else{
mTrueButton.setVisibility(View.VISIBLE);
mFalseButton.setVisibility(View.VISIBLE);
}
}
private void showAnswer(boolean userChoice){
mQuiz.getCurrentQuestion().setAnswer(userChoice);
Toast.makeText(this, mQuiz.getCurrentQuestion().getAnswerRight() ? R.string.toast_correct : R.string.toast_incorrect, Toast.LENGTH_LONG).show();
updateButtonVisibility();
if(mQuiz.areQuestionsLeft() == false){
/*If I set the above line's false to true, I get a score right after
the user answers the first question.*/
mNextButton.setVisibility(View.INVISIBLE);
mPreButton.setVisibility(View.INVISIBLE);
mMessage.setText("Your score is: " + mQuiz.getScore());
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.quiz, menu);
return true;
}
}
这是我的 Quiz.java 代码：
package com.example.quiz;
public class Quiz {
private TrueFalse[] mQuestions;
private int currentQuestion;
public Quiz (TrueFalse[] questions){
setQuestions(questions);
currentQuestion = 0;
}
public TrueFalse[] getQuestions() {
return mQuestions;
}
public void setQuestions(TrueFalse[] questions) {
mQuestions = questions;
}
public boolean nextButton(){
if (currentQuestion < mQuestions.length-1){
currentQuestion++;
return true;
}
return false;
}
public boolean preButton(){
if (currentQuestion > 0){
currentQuestion--;
return true;
}
return false;
}
public TrueFalse getCurrentQuestion(){
return mQuestions[currentQuestion];
}
public boolean areQuestionsLeft(){
for (TrueFalse question: mQuestions)
{
if (question.isQuestionAnswered())
return true;
}
return false;
}
public int getScore(){
return getScore(0);
}
public int getScore(int bonus){
for(TrueFalse question: mQuestions)
bonus += question.getAnswerRight() ? 1 : 0;
return bonus;
}
}
在 QuizActivity.java 代码中，我有一个 showAnswer 函数，我在其中显示分数。这使用 Quiz.java 代码中的 areQuestionsLeft 函数来循环并发送一个布尔值，同样的函数使用 TrueFalse.java 代码中的 isQuestionAnswered 函数。
我可以看到的一件事是，在我的 Quiz.java 代码中，在 areQuestionsLeft 函数中，总是返回 for 循环内的值。
如果有人能指出我的错误在哪里，我将不胜感激！！！非常感谢！