Change the Background of Select/Click listview Item - Android

Question

I am working on the quiz application.For that I am using listview for the dispaly the answers options, I want to change the listview background col

Answer 1

I would suggest to go with the following way: Adapter class: add storing of selected position and its state (CORRECT/INCORRECT) or color, e.g.:

public class ListviewAdapter extends BaseAdapter{

enum AnswerStates {
    // Colors can be provided also for bg
    WRONG(R.drawable.wrong_bg),
    RIGHT(R.drawable.right_bg),
    NONE(R.drawable.list_item_bg);
    /** Drawable id to be used for answer state */
    private int mBg;

    private AnswerStates(int bg) {
        mBg = bg;
    }

    /** getter for drawabale for answer state */
    int getBg() {
        return mBg;
    }
}
...
/** Position of selected answer */
private int mSelectedPosition = -1;
/** State of selected answer */
private AnswerStates mSelectedAnswerState = AnswerStates.NONE;
...
/** Setter for selected answer */
public void setSelectedAnswerState(int selectedPosition, AnswerStates state) {
    mSelectedPosition = selectedPosition;
    mSelectedAnswerState = state;
}    

@Override  
public View getView(int position, View convertView, ViewGroup parent) {
    ...
    // Your stuff
    ...

    if (position == mSelectedPosition) {
        convertView.setBackgroundResource(mSelectedAnswerState.getBg());
    } else {
        // use default bg
        convertView.setBackgroundResource(AnswerStates.NONE.getBg());
    }

    return convertView;
}
...
}

And Activity class:

public class Display_questions extends Activity{
    ...
    // Added position parameter to the function
    static boolean checkAnswer(int selectedPosition) {
        //getSelectedAnswer();

        String answer = SelectedAnswer.getAnswer();

        if (answer==null){

            return false;
        }
        else {

            AnswerStates state = AnswerStates.NONE;

            if (currentQ.getAnswer().trim().equals(answer.trim()))
            { 
               //   here set the background Green color
               currentGame.incrementRightAnswers();
               state = AnswerStates.RIGHT;
            }
            else{
               //   here set the background red color
               //ListviewAdapter.setbackground();
               currentGame.incrementWrongAnswers();
               state = AnswerStates.WRONG;
            }

            adapter.setSelectedAnswerState(selectedPosition, state);
            adapter.notifyDataSetChanged();

            return true;
        }
     }
}

This way is more reliable than another answer, because it will work even if list with answers get scrolled and views get reused by list view.