PinnedHeaderListView通讯录列表 Bug修复与封装

项目用到通讯录列表，百度找到PinnedHeaderListView，但是用起来发现还有几个bug例如空组时抬头显示错误等等，接入也比较麻烦需要重新很多方法内部处理算法也没完全封装起来，所以就自己修复了下里面的bug并封装了代码，现在只需要重写一个adapter就能实现通讯录效果。

package com.test.view;


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

import java.util.ArrayList;
import java.util.List;

public abstract class PinnedHeaderAdapter extends BaseAdapter {

    private HeadSectionIndexer mIndexer;
    private String sections;
    private List lists;


    public PinnedHeaderAdapter(List lists, String sections) {
        this.sections = sections;
        this.lists = lists;
        notifyDataSetChanged();
    }

    @Override
    public void notifyDataSetChanged() {
        int[] counts = new int[sections.length()];
        List temp = new ArrayList<>();

        for(T t : lists) {
            int index = getIndex(sections, t);
            int listIndex = 0;
            //计算所在组的最末位置，并插入列表
            for(int i = 0; i <= index; i++) {
                listIndex += counts[i];
            }
            temp.add(listIndex, t);
            //增加组成员个数
            counts[index]++;
        }
        lists.clear();
        lists.addAll(temp);
        mIndexer = new HeadSectionIndexer(sections, counts);
        super.notifyDataSetChanged();
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        int section = mIndexer.getSectionForPosition(i);
        if(mIndexer.getPositionForSection(section) == i) {
            return getView(i, view, true, mIndexer.getSection(i));
        } else {
            return getView(i, view, false, null);
        }
    }

    /**
     * Pinned header state: don't show the header.
     */
    public static final int PINNED_HEADER_GONE = 0;

    /**
     * Pinned header state: show the header at the top of the list.
     */
    public static final int PINNED_HEADER_VISIBLE = 1;

    /**
     * Pinned header state: show the header. If the header extends beyond
     * the bottom of the first shown element, push it up and clip.
     */
    public static final int PINNED_HEADER_PUSHED_UP = 2;


    public int getPinnedHeaderState(int position) {

        int realPosition = position;
        if(realPosition < 0) {
            return PINNED_HEADER_GONE;
        }
        int section = mIndexer.getSectionForPosition(realPosition);
        int nextSectionPosition = mIndexer.getPositionForSection(section + 1);
        if(nextSectionPosition != -1 && realPosition == nextSectionPosition - 1) {
            return PINNED_HEADER_PUSHED_UP;
        }
        return PINNED_HEADER_VISIBLE;
    }

    public HeadSectionIndexer getIndexer() {
        return mIndexer;
    }

    public abstract void configurePinnedHeader(View header, int position, int alpha, String section);

    public abstract View getHeaderView(ViewGroup viewGroup);

    /**
     * 返回t在sections中要指定的位置
     */
    public abstract int getIndex(String sections, T t);

    public abstract View getView(int i, View view, boolean headerShow, String title);

}

继承adapter主要是实现getIndex方法，返回Int值表示数据t要插入sections中的位置，比如 sections为ABCDEFGHIJKLMNOPQRSTUVWXYZ#，t为字符串a则返回0，t为1则插入未知组#返回#的位置即可

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