public class NestedAdapter extends BaseAdapter {
    private ArrayList<Pair<Adapter, String>> adapters;
    private Context context;

    public NestedAdapter(Context context, Pair<Adapter, String>... adapters) {
        this.context = context;
        this.adapters = new ArrayList<Pair<Adapter, String>>();
    }

    public void addAdapter(Adapter adapter, String title) {
        adapters.add(new Pair<Adapter, String>(adapter, title));
    }

    private int getAdapterSize(Pair<Adapter, String> pair) {
        if(pair.second==null) {
            return pair.first.getCount();
        } else {
            return pair.first.getCount()+1;
        }
    }

    @Override
    public int getCount() {
        int count = 0;
        for(Pair<Adapter, String> pair: adapters) {
            count += getAdapterSize(pair);
        }
        return count;
    }

    @Override
    public Object getItem(int position) {
        Pair<Adapter, Object> pair = getItemWithAdapter(position);
        if(pair.second instanceof String) {
            return pair.second;
        } else {
            return pair.first.getItem((Integer) pair.second);
        }
    }

    private Pair<Adapter, Object> getItemWithAdapter(int position) {
        int sum = 0;
        int adapterId = 0;
        while(sum<=position) {
            sum += getAdapterSize(adapters.get(adapterId));
            adapterId++;
        }
        adapterId--;
        sum -= getAdapterSize(adapters.get(adapterId));

        int index = position - sum;
        Pair<Adapter, String> pair = adapters.get(adapterId);
        if(pair.second==null) {
            return new Pair<Adapter, Object>(pair.first, index);
        } if(index==0) {
            return new Pair<Adapter, Object>(pair.first, pair.second);
        } else {
            return new Pair<Adapter, Object>(pair.first, index - 1);
        }
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Pair<Adapter, Object> itemPair = getItemWithAdapter(position);
        Object second = itemPair.second;
        if(second instanceof String) {
            View view = LayoutInflater.from(context).inflate(android.R.layout.simple_list_item_1, parent, false);
            ((TextView)view.findViewById(android.R.id.text1)).setText((String) second);
            return view;
        } else {
            int index = (Integer) second;
            return itemPair.first.getView(index, convertView, parent);
        }
    }
}