StickyListHeaders的使用

要使用这个开源的StickyListHeaders，首先需要导入它的包。
1、导入包（以下讲的是studio的导入包，后面附上下载源码地址）
直接在Android Studio里面搜索就可以找到：compile ‘se.emilsjolander:stickylistheaders:2.7.0’

开源地址
自行下载····
2、xml文件的设置
main.xml的设置（导入包后可以使用）

 .emilsjolander.stickylistheaders.StickyListHeadersListView
                android:id="@+id/list"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:clipToPadding="false"
                android:drawSelectorOnTop="true"
                android:padding="16dp"
                android:scrollbarStyle="outsideOverlay"
                android:fastScrollEnabled="true"
                android:overScrollMode="never"/>

list_headers.xml的设置（就是一个简单的TextView）

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:paddingBottom="20dp"
    android:paddingTop="20dp"/>

item.xml的设置

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:paddingBottom="20dp"
    android:paddingTop="20dp"/>

3、自定义的adapter

package com.example.keren.teststickylistheaderslistview;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.SectionIndexer;
import android.widget.TextView;

import java.util.ArrayList;

import se.emilsjolander.stickylistheaders.StickyListHeadersAdapter;

public class TestBaseAdapter extends BaseAdapter implements
        StickyListHeadersAdapter, SectionIndexer {

    private final Context mContext;
    private String[] mCountries;
    private int[] mSectionIndices;
    private Character[] mSectionLetters;
    private LayoutInflater mInflater;

    public TestBaseAdapter(Context context) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
        mCountries = context.getResources().getStringArray(R.array.countries);
        mSectionIndices = getSectionIndices();
        mSectionLetters = getSectionLetters();
    }

    /**
     *获取每一项item的首个字母
     * @return
     */
    private int[] getSectionIndices() {
        ArrayList sectionIndices = new ArrayList();
        char lastFirstChar = mCountries[0].charAt(0);
        sectionIndices.add(0);
        for (int i = 1; i < mCountries.length; i++) {
            if (mCountries[i].charAt(0) != lastFirstChar) {
                lastFirstChar = mCountries[i].charAt(0);
                sectionIndices.add(i);
            }
        }
        int[] sections = new int[sectionIndices.size()];
        for (int i = 0; i < sectionIndices.size(); i++) {
            sections[i] = sectionIndices.get(i);
        }
        return sections;
    }

    private Character[] getSectionLetters() {
        Character[] letters = new Character[mSectionIndices.length];
        for (int i = 0; i < mSectionIndices.length; i++) {
            letters[i] = mCountries[mSectionIndices[i]].charAt(0);
        }
        return letters;
    }

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

    @Override
    public Object getItem(int position) {
        return mCountries[position];
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if (convertView == null) {
            holder = new ViewHolder();
            convertView = mInflater.inflate(R.layout.test_list_item_layout, parent, false);
            holder.text = (TextView) convertView.findViewById(R.id.text);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.text.setText(mCountries[position]);

        return convertView;
    }

    @Override
    public View getHeaderView(int position, View convertView, ViewGroup parent) {
        HeaderViewHolder holder;

        if (convertView == null) {
            holder = new HeaderViewHolder();
            convertView = mInflater.inflate(R.layout.header, parent, false);
            holder.text = (TextView) convertView.findViewById(R.id.text1);
            convertView.setTag(holder);
        } else {
            holder = (HeaderViewHolder) convertView.getTag();
        }


        CharSequence headerChar = mCountries[position].subSequence(0, 1);
        holder.text.setText(headerChar);

        return convertView;
    }

    @Override
    public long getHeaderId(int position) {

        return mCountries[position].subSequence(0, 1).charAt(0);
    }

    @Override
    public int getPositionForSection(int section) {
        if (mSectionIndices.length == 0) {
            return 0;
        }

        if (section >= mSectionIndices.length) {
            section = mSectionIndices.length - 1;
        } else if (section < 0) {
            section = 0;
        }
        return mSectionIndices[section];
    }

    @Override
    public int getSectionForPosition(int position) {
        for (int i = 0; i < mSectionIndices.length; i++) {
            if (position < mSectionIndices[i]) {
                return i - 1;
            }
        }
        return mSectionIndices.length - 1;
    }

    @Override
    public Object[] getSections() {
        return mSectionLetters;
    }

    public void clear() {
        mCountries = new String[0];
        mSectionIndices = new int[0];
        mSectionLetters = new Character[0];
        notifyDataSetChanged();
    }

    /**
     *获取资源文件strings的内容
     */
    public void restore() {
        mCountries = mContext.getResources().getStringArray(R.array.countries);
        mSectionIndices = getSectionIndices();
        mSectionLetters = getSectionLetters();
        notifyDataSetChanged();
    }

    class HeaderViewHolder {
        TextView text;
    }

    class ViewHolder {
        TextView text;
    }

}

4、activity部分

        mAdapter = new TestBaseAdapter(this);
        stickyList = (StickyListHeadersListView) findViewById(R.id.list);
        stickyList.setOnItemClickListener(this);
        stickyList.setOnHeaderClickListener(this);
        stickyList.setOnStickyHeaderChangedListener(this);
        stickyList.setOnStickyHeaderOffsetChangedListener(this);
        stickyList.addHeaderView(getLayoutInflater().inflate(R.layout.list_header, null));
        stickyList.addFooterView(getLayoutInflater().inflate(R.layout.list_footer, null));
        stickyList.setEmptyView(findViewById(R.id.empty));
        stickyList.setDrawingListUnderStickyHeader(true);
        stickyList.setAreHeadersSticky(true);
        stickyList.setAdapter(mAdapter);

点击事件

 @Override
    public void onItemClick(AdapterView parent, View view, int position, long id) {
        Toast.makeText(this, "Item " + position + " clicked!", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onHeaderClick(StickyListHeadersListView l, View header, int itemPosition, long headerId, boolean currentlySticky) {
        Toast.makeText(this, "Header " + headerId + " currentlySticky ? " + currentlySticky, Toast.LENGTH_SHORT).show();
    }

    @Override
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void onStickyHeaderOffsetChanged(StickyListHeadersListView l, View header, int offset) {
        if (fadeHeader && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            header.setAlpha(1 - (offset / (float) header.getMeasuredHeight()));
        }
    }

    @Override
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void onStickyHeaderChanged(StickyListHeadersListView l, View header, int itemPosition, long headerId) {
        header.setAlpha(1);
    }

5、附图