Multiple and single choice test

Question

I am working on a Single choice and Multiple choice test.

I have couple of questions and 4 answers for each question.

I am shuffling the answers as each answer is assigned to radio button. This is how i am shuffling the arraylist where Random is a arraylist with items and r1,r2,r3,r4 are radio buttons.

random.add(val);
Collections.shuffle(random);


r1.setText(random.get(0));
r2.setText(random.get(1));
r3.setText(random.get(2));
r4.setText(random.get(3));

I am able to display the answers in jumbled way but when i select the answer i need to show that the answer is correct or wrong.

Sample question and options.
1. which language is used for android programming?
 A.PHP
 B.JAVA
 C.C
 D.C++

Correct answer is B i need to display that correct answer is B.

How to acheive this.

EDIT: I have tried this:

Onclick of each radio button assign the value A and compare the value with xml value if its correct display correct but when i jumble its will not work.

EDIT 2 xml

<Question no="1" text="Which Programming language is used in android develoment" type="SCA" noc="4" jumble="NO" correctans="PHP">
<choice a = "PHP" flag="A"> 
<choice b = "JAVA" flag="B"> 
<choice c = "C" flag="C"> 
<choice d = "C++" flag="D"> 

Answer 1

You can create a hashmap with Option-isOptionCorrect pair. Like for your case:

HashMap<String, Boolean> choices = new HashMap<String, Boolean>();
choices.put("PHP", false);
choices.put("JAVA", true);
choices.put("C", false);
choices.put("C++", false);

Now shuffle the key-value pairs. Your correct choice will be one which has value true in the HashMap.

Answer 2

Egor is clear for what he is suggesting but I'll let you work with your current implementations.

class Option{
      //You can add any other parameters if required.
      String optionText;
      boolean isAnswer;
}

// Use arraylist of Option class like this
ArrayList<Option> options = new ArrayList<Option>(); // in your case random

// Now suffle it.
Collections.shuffle(options);
// get the user selected option and verify using.
if(options.get(userSelectedOptionPosition).isAnswer){
      //show "You are Correct!"
}else{
     // show "You are In correct!"
}

Hope this will help you.