i m making a quiz app, in which i have categories, when i choose a category, qestions start coming from firebase firestore database , in each category i have 10 qestion in database , i want that all qestions load from firebase data base and comes in random order each time ,
but my problem here is all qestions is not loading , some times load 5 ,sometimes 7 and this random order carries on..
i don’t have much knowlegde about firebase database below is the code what i have tried
my QuizzActivity code
public class QuizActivity extends AppCompatActivity {
ActivityQuizBinding binding;
ArrayList<Questions> qestions;
Questions question;
CountDownTimer timer;
FirebaseFirestore database;
int correctAnswer = 0;
int index = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityQuizBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
qestions = new ArrayList<>();
database = FirebaseFirestore.getInstance();
final String cateGoryID = getIntent().getStringExtra("categoryID");
Random random = new Random();
final int rand = random.nextInt(10);
database.collection("categories")
.document(cateGoryID)
.collection("questions")
.whereGreaterThanOrEqualTo("index",rand)
.orderBy("index")
.limit(5)
.get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
if (queryDocumentSnapshots.getDocuments().size()<5){
database.collection("categories")
.document(cateGoryID)
.collection("questions")
.whereLessThanOrEqualTo("index",rand)
.orderBy("index")
.limit(5)
.get().addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
for (DocumentSnapshot snapshot : queryDocumentSnapshots){
Questions questions = snapshot.toObject(Questions.class);
qestions.add(questions);
}
setNextQestions();
}
});
} else {
for (DocumentSnapshot snapshot : queryDocumentSnapshots){
Questions questions = snapshot.toObject(Questions.class);
qestions.add(questions);
}
setNextQestions();
}
}
});
resetTimer();
}
void resetTimer(){
timer = new CountDownTimer(30000,1000) {
@Override
public void onTick(long l) {
binding.timer.setText(String.valueOf(l/1000));
}
@Override
public void onFinish() {
}
};
}
public void CheckAnwer(TextView textView){
String selectAnswer = textView.getText().toString();
if(selectAnswer.equals(question.getAnswer())){
correctAnswer++ ;
textView.setBackground(getResources().getDrawable(R.drawable.option_right));
}
else{
showAnswer();
textView.setBackground(getResources().getDrawable(R.drawable.option_wrong));
}
}
@Override
public void onBackPressed() {
new AlertDialog.Builder(QuizActivity.this)
.setIcon(R.drawable.ic_baseline_person_24)
.setMessage("Are you sure want to Quit Game")
.setPositiveButton("yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
Intent in = new Intent(QuizActivity.this,MainActivity.class);
startActivity(in);
finish();
}
}).setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
}).create().show();
}
public void setNextQestions() {
if(timer != null){
timer.cancel();
}
timer.start();
if (index < qestions.size()) {
binding.qestioncounter.setText(String.format("%d/%d",(index+1),qestions.size()));
question = qestions.get(index);
binding.qestions.setText(question.getQestion());
binding.option1.setText(question.getOption1());
binding.option2.setText(question.getOption2());
binding.option3.setText(question.getOption3());
binding.option4.setText(question.getOption4());
}
}
void reset(){
binding.option1.setBackground(getResources().getDrawable(R.drawable.option_unselected));
binding.option2.setBackground(getResources().getDrawable(R.drawable.option_unselected));
binding.option3.setBackground(getResources().getDrawable(R.drawable.option_unselected));
binding.option4.setBackground(getResources().getDrawable(R.drawable.option_unselected));
}
void showAnswer(){
if (question.getAnswer().equals(binding.option1.getText().toString()))
binding.option1.setBackground(getResources().getDrawable(R.drawable.option_right));
else if (question.getAnswer().equals(binding.option2.getText().toString()))
binding.option2.setBackground(getResources().getDrawable(R.drawable.option_right));
else if (question.getAnswer().equals(binding.option3.getText().toString()))
binding.option3.setBackground(getResources().getDrawable(R.drawable.option_right));
else if (question.getAnswer().equals(binding.option4.getText().toString()))
binding.option4.setBackground(getResources().getDrawable(R.drawable.option_right));
}
public void onClick(View view){
switch (view.getId()){
case R.id.option_1:
case R.id.option_2:
case R.id.option_3:
case R.id.option_4:
if(timer != null){
timer.cancel();
}
TextView selected = (TextView) view;
CheckAnwer(selected);
break;
case R.id.next_btn:
// reset();
if (index < qestions.size()){
reset();
index++;
setNextQestions();}
else {
Toast.makeText(this, "Quiz Finsished", Toast.LENGTH_SHORT).show();
Intent in = new Intent(QuizActivity.this,ResultActivity.class);
in.putExtra("correct_answer",correctAnswer);
in.putExtra("total",qestions.size());
startActivity(in);
}
break;
}
}
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Answer
The easiest thing to do is load all questions without using random and after adding all questions to qestions array list then shuffle it.
for (DocumentSnapshot snapshot : queryDocumentSnapshots){
Questions questions = snapshot.toObject(Questions.class);
qestions.add(questions);
}
Collections.shuffle(questions);
setNextQestions();
Make changes like this.
case R.id.next_btn:
setNextQestions();
break;
setNextQestions method
public void setNextQestions() {
if(timer != null){
timer.cancel();
}
timer.start();
if (index < qestions.size()) {
binding.qestioncounter.setText(String.format("%d/%d",(index+1),qestions.size()));
question = qestions.get(index);
binding.qestions.setText(question.getQestion());
binding.option1.setText(question.getOption1());
binding.option2.setText(question.getOption2());
binding.option3.setText(question.getOption3());
binding.option4.setText(question.getOption4());
index++;
}
else {
reset();
Toast.makeText(this, "Quiz Finsished", Toast.LENGTH_SHORT).show();
Intent in = new Intent(QuizActivity.this,ResultActivity.class);
in.putExtra("correct_answer",correctAnswer);
in.putExtra("total",qestions.size());
startActivity(in);
}
}