I'm doing a project right now that is supposed to be a math teaching app for kids. I'm using firebase as my database to save the user names and password and also to save the questions and their answers. I have a problem retreiving the question and the answers from the database and display it on the buttons and textview because it appears that the listener for single value event is triggered only when the class is done with all the other commands and i need to use this listener for every question i have.
My database:
My code so far:
ArrayList <Integer> list = new ArrayList<Integer>();
for (int i=1; i<11; i++) {
list.add(new Integer(i));
}
Collections.shuffle(list);
for (int i=0; i<5; i++) {
ref2 = ref.child(list.get(i).toString());
Questions.cont = false;
getQuestionsFromDb(ref2);
questionView.setText(Questions.question);
button1.setText(Questions.ans1);
button2.setText(Questions.ans2);
button3.setText(Questions.ans3);
button4.setText(Questions.ans4);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Questions.cont = true;
int ans = getAns(Questions.question);
Button b = (Button)v;
int buttonText = Integer.parseInt(b.getText().toString());
if(ans == buttonText) {
Questions.points++;
}
}
});
}
questionView.setText(Questions.points);
// end of for loop
}
private void getQuestionsFromDb(Firebase ref2) {
// TODO Auto-generated method stub
ref2.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot snapshot) {
System.out.println("aaa");
String question = (String) snapshot.child("question").getValue();
String ans1 = snapshot.child("ans1").getValue().toString();
String ans2 = snapshot.child("ans2").getValue().toString();
String ans3 = snapshot.child("ans3").getValue().toString();
String ans4 = snapshot.child("ans4").getValue().toString();
Questions.question = question;
Questions.ans1 = ans1;
Questions.ans2 = ans2;
Questions.ans3 = ans3;
Questions.ans4 = ans4;
}
@Override
public void onCancelled(FirebaseError arg0) {
// TODO Auto-generated method stub
}
});
}
private int getAns(String ansString) {
// TODO Auto-generated method stub
String[] parts = ansString.split("\\b");
String ans;
if(parts.length == 5) {
ans = parts[0] + parts[1] + parts[2] + parts [3] + parts [4];
}
else {
ans = parts[0] + parts[1] + parts[2];
}
return Integer.parseInt(ans);
}
As you can see i'm also using outer class that have static variables in order to save the questions and the answers and use them out of the inner class.
I hope someone can help.
