《Android编程权威指南（第3版）》：挑战练习.pdfVIP

《Android编程权威指南（第3版）》：挑战练习 ⽤户答完某道题，就禁掉那道题对应的按钮，防⽌⽤户⼀题多答。 ⽤户答完全部题后，显⽰⼀个toast消息，给出百分⽐形式的评分。 Question.java中添加 public class Question { private int mTextResId; private boolean mAnswerTrue; private int mAnswered; public Question(int textResId, boolean answerTrue){ this.mTextResId = textResId; this.mAnswerTrue = answerTrue; this.mAnswered = 0; } public int isAnswered(){ return mAnswered; } public void setAnswered(int answered){ mAnswered = answered; } } QuizActivity中修改部分： public class QuizActivity extends AppCompatActivity { private static final String ANSWERED_LIST = answered_list; private static final String CORRECT_NUM = correct_num; private static final String INCORRECT_NUM = incorrect_num; private int correct = 0;//正确答案数量 private int incorrect = 0;//错误答案数量 } @Override protected void onSaveInstanceState(Bundle saveInstanceState){ super.onSaveInstanceState(saveInstanceState); Log.i(TAG, onSaveInstanceState); saveInstanceState.putInt(KEY_INDEX, mCurrentIndex); int[] vis = new int[mQuestionBank.length]; for (int i = 0; i mQuestionBank.length; i++) vis[i] = mQuestionBank[i].isAnswered(); saveInstanceState.putIntArray(ANSWERED_LIST, vis); //保留答题情况 saveInstanceState.putInt(CORRECT_NUM, correct); //保留答对题数 saveInstanceState.putInt(INCORRECT_NUM, incorrect);//保留答错题数 } if (savedInstanceState != null){ mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0); int[] vis = savedInstanceState.getIntArray(ANSWERED_LIST); for (int i = 0; i mQuestionBank.length; i++) //恢复答题情况 mQuestionBank[i].setAnswered(vis[i]); correct = savedInstanceState.getInt(CORRECT_NUM);//恢复答对题数