generic adapter android

adpater

package com.itv.util;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public class DataDelegateAdapter<T> extends BaseAdapter {

    private DataAdapterDelegate<T> delegate;
    private boolean shouldLoadMoreData = true;
    private boolean isLoadingData = false;
    private int page;

    public DataDelegateAdapter(DataAdapterDelegate<T> delegate) {
        this.delegate = delegate;
        this.page = 0;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (position == getCount() - 1 && shouldLoadMoreData && !isLoadingData) {
            isLoadingData = true;
            page++;
            delegate.loadMoreData(page);
        }

        if(convertView == null) convertView = delegate.inflateView();
        delegate.populateView(getItem(position), convertView);
        return convertView;
    }

    @Override
    public void notifyDataSetChanged() {
        super.notifyDataSetChanged();
        isLoadingData = false;
    }

    public void notifyDataSetChanged(boolean shouldLoadMoreData) {
        super.notifyDataSetChanged();
        this.isLoadingData = false;
        this.shouldLoadMoreData = shouldLoadMoreData;
    }

    @Override
    public void notifyDataSetInvalidated() {
        super.notifyDataSetInvalidated();
        shouldLoadMoreData = true;
        isLoadingData = false;

    }

    @Override
    public int getCount() {
        return delegate.getCount();
    }

    @Override
    public T getItem(int position) {
        return delegate.getItem(position);
    }

    public int getPage() {
        return page;
    }

    public interface DataAdapterDelegate<T> {
        int getCount();
        T getItem(int position);
        void populateView(T item, View convertView);
        View inflateView();
        void loadMoreData(int page);
    }

    public static abstract class DataAdapterDelegateImp<T> implements DataAdapterDelegate<T>{

        @Override
        public abstract int getCount();

        @Override
        public abstract T getItem(int position);

        @Override
        public abstract void populateView(T item, View convertView);

        @Override
        public abstract View inflateView();

        @Override
        public void loadMoreData(int page) { }
    }
}