AlternatingColorListAdapter.java

/*
 * Copyright 2012 GitHub Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.mobile.gauges.ui;

import android.view.LayoutInflater;

import com.github.kevinsawicki.wishlist.SingleTypeAdapter;
import com.github.mobile.gauges.R.color;
import com.github.mobile.gauges.R.drawable;

import java.util.List;

/**
 * List adapter that colors rows in alternating colors
 *
 * @param <V>
 */
public abstract class AlternatingColorListAdapter<V> extends
        SingleTypeAdapter<V> {

    private final int primaryResource;

    private final int secondaryResource;

    /**
     * Create adapter with alternating row colors
     *
     * @param layoutId
     * @param inflater
     * @param items
     */
    public AlternatingColorListAdapter(final int layoutId,
            final LayoutInflater inflater, final List<V> items) {
        this(layoutId, inflater, items, true);
    }

    /**
     * Create adapter with alternating row colors
     *
     * @param layoutId
     * @param inflater
     * @param items
     * @param selectable
     */
    public AlternatingColorListAdapter(final int layoutId,
            LayoutInflater inflater, final List<V> items, boolean selectable) {
        super(inflater, layoutId);

        if (selectable) {
            primaryResource = drawable.table_background_selector;
            secondaryResource = drawable.table_background_alternate_selector;
        } else {
            primaryResource = color.pager_background;
            secondaryResource = color.pager_background_alternate;
        }

        setItems(items);
    }

    @Override
    protected void update(final int position, final V item) {
        if (position % 2 != 0)
            updater.view.setBackgroundResource(primaryResource);
        else
            updater.view.setBackgroundResource(secondaryResource);
    }
}