我正在Android应用中制作测验部分。我创建了一个数据库，并使程序从表中选择随机行（问题）。然后在实际测验中显示这些随机问题，之后用户可以看到他回答哪些问题是对错。问题是在显示正确答案的活动中，问题与测验中的问题完全不同。他们似乎也以某种方式随机化。
这是Database类的摘录：
// Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_QUESTION = "question";
private static final String KEY_ANSWER = "answer"; //correct option
private static final String KEY_OPTA = "opta"; //option a
private static final String KEY_OPTB = "optb"; //option b
private static final String KEY_OPTC = "optc"; //option c
private static final String KEY_OPTD = "optd"; //option d
private SQLiteDatabase myDatabase;
public SQLDatabaseT1(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db1) {
myDatabase=db1;
// A new table is created if there is none
String sql = "CREATE TABLE IF NOT EXISTS " + TABLE_QUESTION + " ( "
+ KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_QUESTION
+ " TEXT, " + KEY_ANSWER + " TEXT, "+ KEY_OPTA +" TEXT, "
+ KEY_OPTB +" TEXT, "+ KEY_OPTC +" TEXT, " + KEY_OPTD + " TEXT)";
db1.execSQL(sql);
// Adds questions from this method below
addQuestions1();
}
@Override
public void onUpgrade(SQLiteDatabase db1, int oldV, int newV) {
// Drop older table if existed
db1.execSQL("DROP TABLE IF EXISTS " + TABLE_QUESTION);
// Creates tables again
onCreate(db1);
}
// Takes 7 random rows from the table and puts into the topic quiz
public Cursor getRandomDataItemFromDb(String TABLE_QUESTION, String limit) {
SQLiteDatabase db1 = this.getWritableDatabase();
Cursor cursor = db1.rawQuery("SELECT * FROM " + TABLE_QUESTION + " ORDER BY RANDOM() LIMIT 7", null);
if (cursor.moveToFirst()) {
return cursor;
}
return cursor;
}
// Sets the limit of how many questions will be in the quiz
public int rowCount()
{
int row=7; //There will be 7 questions in a quiz
return row;
}
public List<Question> getAllQuestions() {
List<Question> quesList = new ArrayList<Question>();
String selectQuery = "SELECT * FROM " + TABLE_QUESTION + " ORDER BY RANDOM() LIMIT 7";
myDatabase=this.getReadableDatabase();
Cursor cursor = myDatabase.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
Question quest = new Question();
quest.setId(cursor.getInt(0));
quest.setQUESTION(cursor.getString(1));
quest.setANSWER(cursor.getString(2));
quest.setOptionA(cursor.getString(3));
quest.setOptionB(cursor.getString(4));
quest.setOptionC(cursor.getString(5));
quest.setOptionD(cursor.getString(6));
quesList.add(quest);
} while (cursor.moveToNext());
}
// returns question list
return quesList;
}
这是显示问题列表的类，显示正确的答案和用户的答案：
public class QuizViewAnswers1 extends AppCompatActivity {
private ListView listofAnswers;
private List<Question> questionsList;
private Question currentQuestion;
ArrayList<HashMap<String, Object>> originalValues = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> temp = new HashMap<String, Object>();
public static String KEY_QUESTION = "questions";
public static String KEY_CANS = "canswer";
public static String KEY_YANS = "yanswer";
private CustomAdapter adapter;
ArrayList<String> myAnsList = new ArrayList<String>();
Button homeQuiz;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.quiz_show_ans);
String selectQuery;
Intent in = getIntent();
Bundle b = getIntent().getExtras();
myAnsList=in.getExtras().getStringArrayList("myAnsList");
listofAnswers=(ListView)findViewById(R.id.listofAnswers);
//Initialize the database
final SQLDatabaseT1 sqldb = new SQLDatabaseT1(this);
questionsList= sqldb.getAllQuestions();
for (int i = 0; i < 7; i++) {
currentQuestion = questionsList.get(i);
temp = new HashMap<String, Object>();
temp.put(KEY_QUESTION, currentQuestion.getQUESTION());
temp.put(KEY_CANS, currentQuestion.getANSWER());
temp.put(KEY_YANS, myAnsList.get(i));
// add the row to the ArrayList
originalValues.add(temp);
}
adapter = new CustomAdapter(QuizViewAnswers1.this, R.layout.ans_list, originalValues);
listofAnswers.setAdapter(adapter);
homeQuiz = (Button) findViewById(R.id.quizHome);
homeQuiz.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(QuizViewAnswers1.this, Quiz.class);
startActivity(intent);
finish();
}
});
}
// define your custom adapter
private class CustomAdapter extends ArrayAdapter<HashMap<String, Object>> {
LayoutInflater inflater;
public CustomAdapter(Context context, int textViewResourceId, ArrayList<HashMap<String, Object>> Strings) {
super(context, textViewResourceId, Strings);
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
// class for caching the views in a row
private class ViewHolder {
TextView viewQuestions, viewAnswers, yourAnswers;
}
ViewHolder viewHolder;
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.ans_list, null);
viewHolder = new ViewHolder();
viewHolder.viewQuestions = (TextView) convertView.findViewById(R.id.question);
viewHolder.viewAnswers = (TextView) convertView
.findViewById(R.id.correctanswer);
viewHolder.yourAnswers = (TextView) convertView
.findViewById(R.id.useranswer);
// link the cached views to the convertview
convertView.setTag(viewHolder);
} else
viewHolder = (ViewHolder) convertView.getTag();
viewHolder.viewQuestions.setText(originalValues.get(position).get(KEY_QUESTION)
.toString());
viewHolder.viewAnswers.setText("Correct Answer: " + originalValues.get(position).get(KEY_CANS)
.toString());
viewHolder.yourAnswers.setText("Your Answer: " + originalValues.get(position)
.get(KEY_YANS).toString());
// return the view to be displayed
return convertView;
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
图片显示的示例中的问题与“正确答案”列表完全不同。唯一剩下的就是用户做出的回答。 Question Answers list
我应该在QuizViewAnswers1类中更改什么？提前致谢。
答案 0 :(得分：0)
问题是你是用sqldb.getAllQuestions()再次提问，然后再将它们随机化。
这样做的方法是使用您提取的相同数据集来提问。只需将其存储在一些常见位置（也可以是单例类），然后从测验活动和结果活动中访问它。
