This is my code for questions, my problem is that i cannot create a code to randomly output a question from xml without any duplication, Here's my code:
public class QuizFunActivity extends Activity{
Intent menu = null;
BufferedReader bReader = null;
static JSONArray quesList = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main2);
Thread thread = new Thread() {
public void run() {
try {
Thread.sleep(3*1000);
finish();
loadQuestions();
Intent intent = new Intent(QuizFunActivity.this, QuestionActivity.class);
QuizFunActivity.this.startActivity(intent);
} catch (Exception e) {
}
}
};
thread.start();
}
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());
} catch (Exception e){
} finally {
try {
bReader.close();
} catch (Exception e) {
Log.e("", e.getMessage().toString(), e.getCause());
}
}
}
public static JSONArray getQuesList() {
return quesList;
}
}
can you give me a sample of which part on my code should i create a code for random output? thanks for the help!
you may take a look with this activity,
public class QuestionActivity extends Activity {
/** Called when the activity is first created. */
EditText question = null;
RadioButton answer1 = null;
RadioButton answer2 = null;
RadioButton answer3 = null;
RadioButton answer4 = null;
RadioGroup answers = null;
Button finish = null;
int selectedAnswer = -1;
int quesIndex = 0;
int numEvents = 0;
int selected[] = null;
int correctAns[] = null;
boolean review =false;
Button prev, next = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.question);
TableLayout quizLayout = (TableLayout) findViewById(R.id.quizLayout);
quizLayout.setVisibility(android.view.View.INVISIBLE);
try {
question = (EditText) findViewById(R.id.question1);
answer1 = (RadioButton) findViewById(R.id.a0);
answer2 = (RadioButton) findViewById(R.id.a1);
answer3 = (RadioButton) findViewById(R.id.a2);
answer4 = (RadioButton) findViewById(R.id.a3);
answers = (RadioGroup) findViewById(R.id.answers);
RadioGroup questionLayout = (RadioGroup)findViewById(R.id.answers);
Button finish = (Button)findViewById(R.id.finish);
finish.setOnClickListener(finishListener);
prev = (Button)findViewById(R.id.Prev);
prev.setOnClickListener(prevListener);
next = (Button)findViewById(R.id.Next);
next.setOnClickListener(nextListener);
selected = new int[QuizFunActivity.getQuesList().length()];
java.util.Arrays.fill(selected, -1);
correctAns = new int[QuizFunActivity.getQuesList().length()];
java.util.Arrays.fill(correctAns, -1);
this.showQuestion(0,review);
quizLayout.setVisibility(android.view.View.VISIBLE);
} catch (Exception e) {
Log.e("", e.getMessage().toString(), e.getCause());
}
}
private void showQuestion(int qIndex,boolean review) {
try {
JSONObject aQues = QuizFunActivity.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.WHITE);
answer2.setTextColor(Color.WHITE);
answer3.setTextColor(Color.WHITE);
answer4.setTextColor(Color.WHITE);
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());
aAns = ansList.getJSONObject(3).getString("Answer");
answer4.setText(aAns.toCharArray(), 0, aAns.length());
Log.d("",selected[qIndex]+"");
if (selected[qIndex] == 0)
answers.check(R.id.a0);
if (selected[qIndex] == 1)
answers.check(R.id.a1);
if (selected[qIndex] == 2)
answers.check(R.id.a2);
if (selected[qIndex] == 3)
answers.check(R.id.a3);
setScoreTitle();
if (quesIndex == (QuizFunActivity.getQuesList().length()-1))
next.setEnabled(false);
if (quesIndex == 0)
prev.setEnabled(false);
if (quesIndex > 0)
prev.setEnabled(true);
if (quesIndex < (QuizFunActivity.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 (selected[qIndex] == 3)
answer4.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);
if (correctAns[qIndex] == 3)
answer4.setTextColor(Color.GREEN);
}
} catch (Exception e) {
Log.e(this.getClass().toString(), e.getMessage(), e.getCause());
}
}
private OnClickListener finishListener = new OnClickListener() {
public void onClick(View v) {
setAnswer();
//Calculate Score
int score = 0;
for(int i=0; i<correctAns.length; i++){
if ((correctAns[i] != -1) && (correctAns[i] == selected[i]))
score++;
}
AlertDialog alertDialog;
alertDialog = new AlertDialog.Builder(QuestionActivity.this).create();
alertDialog.setTitle("Score");
alertDialog.setMessage((score) +" out of " + (QuizFunActivity.getQuesList().length()));
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "Retake", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int which) {
review = false;
quesIndex=0;
QuestionActivity.this.showQuestion(0, review);
}
});
/* alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Review", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int which) {
review = true;
quesIndex=0;
QuestionActivity.this.showQuestion(0, review);
}
}); */
alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE,"Quit", new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int which) {
review = false;
Intent instructionsIntent = new Intent(QuestionActivity.this,MainBookActivity.class);
startActivity(instructionsIntent);
finish();
}
});
alertDialog.show();
}
};
private void setAnswer() {
if (answer1.isChecked())
selected[quesIndex] = 0;
if (answer2.isChecked())
selected[quesIndex] = 1;
if (answer3.isChecked())
selected[quesIndex] = 2;
if (answer4.isChecked())
selected[quesIndex] = 3;
Log.d("",Arrays.toString(selected));
Log.d("",Arrays.toString(correctAns));
}
private OnClickListener nextListener = new OnClickListener() {
public void onClick(View v) {
setAnswer();
quesIndex++;
if (quesIndex >= QuizFunActivity.getQuesList().length())
quesIndex = QuizFunActivity.getQuesList().length() - 1;
showQuestion(quesIndex,review);
}
};
private OnClickListener prevListener = new OnClickListener() {
public void onClick(View v) {
setAnswer();
quesIndex--;
if (quesIndex < 0)
quesIndex = 0;
showQuestion(quesIndex,review);
}
};
private void setScoreTitle() {
this.setTitle("SciQuiz3 " + (quesIndex+1)+ "/" + QuizFunActivity.getQuesList().length());
}
@Override
public void onBackPressed() {
moveTaskToBack(true);
}
}
Thanks!