Question

I’m new to Android.

I am facing problem with array list.The problem is,

My arrays are string array list.
What i need is? I have two array list. QtnsArraylist1 contains 4 elements(4 questions) and AnsArraylist2 contains 16 elements( 16 Answers, for each question 4 options totally 16 elements).For my first Question in QtnsArraylist1 i have to get first 4 elements from AnsArraylist2.Similarly for 2,3,4 questions if give next button .How i can get? .

Please help me some one.

Thanks in Advance.

      D/TAG(910): 1
      D/TAG(910): 2
      D/TAG(910): 3
      D/TAG(910): 4
      D/TAG(910): 5
      D/TAG(910): 6
      D/TAG(910): 1
      D/TAG(910): 2
      D/TAG(910): 3
      D/TAG(910): 4
      D/TAG(910): 5
      D/TAG(910): 6
      D/TAG(910): 1
      D/TAG(910): 2
      D/TAG(910): 3
      D/TAG(910): 4
      D/TAG(910): 5
      D/TAG(910): 6
      D/TAG(910): 1
      D/TAG(910): 2
      D/TAG(910): 3
      D/TAG(910): 4
      D/TAG(910): 5
      D/TAG(910): 6
      D/TAG(910): 1
      D/TAG(910): 2
      D/TAG(910): 3
      D/TAG(910): 4
      D/TAG(910): 5
      D/TAG(910): 6
      D/AndroidRuntime(910): Shutting down VM
      W/dalvikvm(910): threadid=1: thread exiting with uncaught exception 
      (group=0x40015560)
      E/AndroidRuntime(910): FATAL EXCEPTION: main
      E/AndroidRuntime(910): java.lang.IndexOutOfBoundsException: Invalid index 16, size 
      is 16
      E/AndroidRuntime(910):    at 
      java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257)
      E/AndroidRuntime(910):    at java.util.ArrayList.get(ArrayList.java:311)

code

     protected void onPostExecute(String file_url) {
        pDialog.dismiss();  
        for ( int i = 0,j = 0; i < ques1.size(); i++) {
            String s1 = ques1.get(i).toString();
            Log.d("TAG", "1");
            TextView txtque = (TextView) findViewById(R.id.que_txt); 
            txtque.setText(s1);
            Log.d("TAG", "2");
            btn_practicerg =(RadioGroup) findViewById(R.id.rdgroup);
            Log.d("TAG", "3");
            btn_practice1 = (RadioButton) findViewById(R.id.RB1);
            Log.d("TAG", "4");
            btn_practice2 = (RadioButton) findViewById(R.id.RB2);
            Log.d("TAG", "5");
            btn_practice3 = (RadioButton) findViewById(R.id.RB3);
            Log.d("TAG", "6");
            btn_practice4 = (RadioButton) findViewById(R.id.RB4);
            String s2 = answ1.get(j++);
            btn_practice1.setText(s2);
            String s3 = answ1.get(j++);
            btn_practice1.setText(s3);
            String s4 = answ1.get(j++);
            btn_practice1.setText(s4);
            String s5 = answ1.get(j++);   
            btn_practice1.setText(s5);
            //Display them
        }     
    }

Answer 1

I could not exactly get what is your problem. If you want to display an element from ArrayList1 followed by 4 elements of ArrayList2 then its quite simple.

for ( int i = 0,j = 0; i < ArrayList1.size(); i++) {
    s1 = ArrayList1.get(i);
    s2 = ArrayList2.get(j++);
    s3 = ArrayList2.get(j++);
    s4 = ArrayList2.get(j++);
    s5 = ArrayList2.get(j++);   
    //Display them
}     

Please feel free to ask any doubts.

Try the following code

Log.d("TAG", "onCreate() entered");
    setContentView(R.layout.activity_main);
    ArrayList<String> questionsList = new ArrayList<String>();
    ArrayList<String> answersList = new ArrayList<String>();

    //Initializing the arrayLists
    for (int index = 0; index < 4; index++) {
        questionsList.add("ques" + index + 1);
    }
    for (int index = 0; index < 16; index++) {
        answersList.add("ans" + index + 1);
    }

    //Output
    for (int questionIndex = 0, answerIndex = 0; questionIndex < questionsList.size(); questionIndex++) {
        Log.d("TAG", questionsList.get(questionIndex));

        Log.d("TAG", answersList.get(answerIndex++));
        Log.d("TAG", answersList.get(answerIndex++));
        Log.d("TAG", answersList.get(answerIndex++));
        Log.d("TAG", answersList.get(answerIndex++));

    }

I am appending the method to set into radioBtn and textViews.

In the layout file
set textView ids
“@+id/questionView1”
“@+id/questionView2”
and so on, the radioBtns as

 "@+id/radioBtn1"
 "@+id/radioBtn2" 

and so on till 16

In program

 for (int questionIndex = 0, answerIndex = 0; questionIndex < questionsList.size(); questionIndex++) {
        TextView tv = (TextView) findViewById(R.id.questionView + questionIndex + 1);
        tv.setText(questionsList.get(questionIndex));

        RadioButton rb1 = (RadioButton) findViewById(R.id.radioBtn + answerIndex + 1);
        rb1.setText(answersList.get(answerIndex++));

        RadioButton rb2 = (RadioButton) findViewById(R.id.radioBtn + answerIndex + 1);
        rb2.setText(answersList.get(answerIndex++));

        RadioButton rb3 = (RadioButton) findViewById(R.id.radioBtn + answerIndex + 1);
        rb3.setText(answersList.get(answerIndex++));

        RadioButton rb4 = (RadioButton) findViewById(R.id.radioBtn + answerIndex + 1);
        rb4.setText(answersList.get(answerIndex++));


    }