嘿伙计我正在开发一个测验，我存储了50个问题，可以使用json数组访问，我只想显示10个问题，我的问题是每次用户都会显示所有这50个问题。是的如果我只想显示10个问题，可以限制它们吗？在我的第10个问题之后，显示了分数类。
你能帮帮我吗？
List<JSONObject> question = null;
private void loadQuestions() throws Exception {
try {
InputStream questions = this.getBaseContext().getResources()
.openRawResource(R.raw.questions);
bReader = new BufferedReader(new InputStreamReader(questions));
StringBuilder quesString = new StringBuilder();
String aJsonLine = null;
while ((aJsonLine = bReader.readLine()) != null) {
quesString.append(aJsonLine);
}
Log.d(this.getClass().toString(), quesString.toString());
JSONObject quesObj = new JSONObject(quesString.toString());
quesList = quesObj.getJSONArray("Questions");
Log.d(this.getClass().getName(),
"Num Questions " + quesList.length());
question = new ArrayList<JSONObject>();
int n = Math.min(10, quesList.length());
for(int i = 0; i < n; i++) {
JSONObject questions1 = quesList.getJSONObject(i);
question.add(questions1);
}
} catch (Exception e) {
} finally {
try {
bReader.close();
} catch (Exception e) {
Log.e("", e.getMessage().toString(), e.getCause());
}
}
}
public static JSONArray getQuesList()throws JSONException{
Random rnd = new Random();
for (int i = quesList.length() - 1; i >= 0; i--)
{
int j = rnd.nextInt(i + 1);
// Simple swap
Object object = quesList.get(j);
quesList.put(j, quesList.get(i));
quesList.put(i, object);
}
return quesList;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.startquiz);
try {
score = getIntent().getIntExtra("score",0);
items = (TextView)findViewById(R.id.displayitems);
question = (TextView) findViewById(R.id.displayquestion);
answer1 = (RadioButton) findViewById(R.id.option1);
answer2 = (RadioButton) findViewById(R.id.option2);
answer3 = (RadioButton) findViewById(R.id.option3);
answers = (RadioGroup) findViewById(R.id.QueGroup1);
next = (Button) findViewById(R.id.selected);
next.setOnClickListener(nextListener);
selected = new int[Question1.getQuesList().length()];
java.util.Arrays.fill(selected, -1);
correctAns = new int[Question1.getQuesList().length()];
java.util.Arrays.fill(correctAns, -1);
this.showQuestion(0, review);
} catch (Exception e) {
Log.e("", e.getMessage().toString(), e.getCause());
}
}
private void showQuestion(int qIndex, boolean review) {
try {
JSONObject aQues = Question1.getQuesList().getJSONObject(
qIndex);
String quesValue = aQues.getString("Question");
if (correctAns[qIndex] == -1) {
String correctAnsStr = aQues.getString("CorrectAnswer");
correctAns[qIndex] = Integer.parseInt(correctAnsStr);
}
question.setText(quesValue.toCharArray(), 0, quesValue.length());
answers.check(-1);
answer1.setTextColor(Color.BLACK);
answer2.setTextColor(Color.BLACK);
answer3.setTextColor(Color.BLACK);
JSONArray ansList = aQues.getJSONArray("Answers");
String aAns = ansList.getJSONObject(0).getString("Answer");
answer1.setText(aAns.toCharArray(), 0, aAns.length());
aAns = ansList.getJSONObject(1).getString("Answer");
answer2.setText(aAns.toCharArray(), 0, aAns.length());
aAns = ansList.getJSONObject(2).getString("Answer");
answer3.setText(aAns.toCharArray(), 0, aAns.length());
Log.d("", selected[qIndex] + "");
if (selected[qIndex] == 0)
answers.check(R.id.option1);
if (selected[qIndex] == 1)
answers.check(R.id.option2);
if (selected[qIndex] == 2)
answers.check(R.id.option3);
setText();
if (quesIndex == (Question1.getQuesList().length() - 1))
next.setEnabled(false);
if (quesIndex < (Question1.getQuesList().length() - 1))
next.setEnabled(true);
if (review) {
Log.d("review", selected[qIndex] + "" + correctAns[qIndex]);
;
if (selected[qIndex] != correctAns[qIndex]) {
if (selected[qIndex] == 0)
answer1.setTextColor(Color.RED);
if (selected[qIndex] == 1)
answer2.setTextColor(Color.RED);
if (selected[qIndex] == 2)
answer3.setTextColor(Color.RED);
}
if (correctAns[qIndex] == 0)
answer1.setTextColor(Color.GREEN);
if (correctAns[qIndex] == 1)
answer2.setTextColor(Color.GREEN);
if (correctAns[qIndex] == 2)
answer3.setTextColor(Color.GREEN);
}
} catch (Exception e) {
Log.e(this.getClass().toString(), e.getMessage(), e.getCause());
}
}
private void setAnswer() {
if (answer1.isChecked())
selected[quesIndex] = 0;
if (answer2.isChecked())
selected[quesIndex] = 1;
if (answer3.isChecked())
selected[quesIndex] = 2;
Log.d("", Arrays.toString(selected));
Log.d("", Arrays.toString(correctAns));
}
private OnClickListener nextListener = new OnClickListener() {
public void onClick(View v) {
int i = correctAns.length;
if (v == answers){
if (correctAns[i] == selected[i])
{
score++;
Toast.makeText(getApplicationContext(), "Your answer is correct!", Toast.LENGTH_SHORT).show();
}else
{
Toast.makeText(getApplicationContext(), "Your answer is wrong..." + correctAns, Toast.LENGTH_SHORT).show();
}
}
quesIndex++;
try {
if (quesIndex >= Question1.getQuesList().length())
quesIndex = Question1.getQuesList().length() - 1;
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
showQuestion(quesIndex, review);
}
};
private void setText() throws JSONException {
this.setTitle("Question " + (quesIndex + 1) + " out of "
+ Question1.getQuesList().length());
items.setGravity(250);
}
public void reload() {
setAnswer();
Intent intent = getIntent();
overridePendingTransition(0, 0);
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
finish();
overridePendingTransition(0, 0);
startActivity(intent);
}
答案 0 :(得分：0)
根据我的理解，如果您下载整个json响应并且只读取相关部分可能会更好。
理想情况下，如果你想要10个问题并且总共50个问题意味着你想要让10个问题出现5次。为了做到这一点，你可以将它全部存储在一个ArrayList中，然后当你到达下一个集合时，只需将你去的位置偏移10，然后抓住这些元素并显示它们并重复这个过程直到你没有的问题。或者另一种方法是在每次使用后移除顶部装置，并且每次只读取前10位。
请记住，当您抓住新问题时，必须使用您正在阅读ArrayList的新元素更新内容。