How to remove Duplicate value from arraylist in Android [duplicate]

Answer 1

I think a real neat solution for enforcing unique array lists is this one, if it's not too much code for what you're trying to achieve.

public class UniqueOverridingList extends ArrayList {

    public enum LAST_RESULT {
        ADD, OVERRIDE, NOTHING;
    }

    private LAST_RESULT lastResult;

    public boolean add(T obj) {
        for (int i = 0; i < size(); i++) {
            if (obj.equals(get(i))) {
                set(i, obj);
                lastResult = LAST_RESULT.OVERRIDE;
                return true;
            }
        }
        boolean b = super.add(obj);
        if (b) {
            lastResult = LAST_RESULT.ADD;
        } else {
            lastResult = LAST_RESULT.NOTHING;
        }
        return b;
    }

    public boolean addAll(Collection c) {
        boolean result = true;
        for (T t : c) {
            if (!add(t)) {
                result = false;
            }
        }
        return result;
    }

    public LAST_RESULT getLastResult() {
        return lastResult;
    }

}