Android Open Source - Android-MyStarterApp Reuse Cached View Adapter

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License

The source code is released under:

Apache License

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Java Source Code

package co.kaush.mystarterapp.app.ui.adapters;
/*from www  . j av  a  2  s . c  o m*/
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

import co.kaush.mystarterapp.app.ui.viewholder.ViewHolder;
import co.kaush.mystarterapp.app.R;

/**
 * an adapter that takes advantage of:
 *
 * 1. reusableView (convertView) caching from the Android framework
 * 2. ViewHolder pattern which caches view holders (and prevents multiple costly findViewByID calls)
 *
 * @param <T>
 */
public abstract class ReuseCachedViewAdapter<T>
    extends BaseAdapter {

    public static final int ITEM_VIEW_TYPE_1 = 0;
    public static final int ITEM_VIEW_TYPE_2 = 1;

    @Override
    public abstract T getItem(int position);

    @Override
    public final View getView(int position, View reusableView, ViewGroup container) {
        if (reusableView == null) {
            // isSameViewType
            reusableView = newView(LayoutInflater.from(container.getContext()),
                                   position,
                                   container);

            reusableView.setTag(R.id.KEY_VIEWHOLDER_TYPE, ITEM_VIEW_TYPE_1);
            reusableView.setTag(R.id.KEY_VIEWHOLDER, getNewViewHolder());
        }

        ViewHolder vh = (ViewHolder<T>) reusableView.getTag(R.id.KEY_VIEWHOLDER);
        vh.bind(getItem(position));
        return vh.getView();
    }

    public abstract View newView(LayoutInflater layoutInflater, int position, ViewGroup container);

    public abstract ViewHolder<T> getNewViewHolder();

    private boolean _isSameViewType() {
        return true;
    }
}

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