FastScroll(3)分组的listview 打开fastscroll的分组提示功能

1，让ListView显示分组（用两个layout）

2，让ListView实现sectionIndexer接口

3，代码如下:

 import java.util.ArrayList;

 import com.example.fastscroll.R;

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

 public class GroupsFastScrollAdapter extends BaseAdapter implements SectionIndexer{

     Context context;
     LayoutInflater inflater;

     /*
      * 保存当前section的第一条记录的Position
      * Character是section,Integer是section对应的第一条数据的position
      */
     /*
      *     保存每个section的第一条数据的position
      *     firstPositions的下标        firstPositions的值
      *                 0                0
      *                 1                2
      *                 2                4
      *                 3                6
      */

     Integer firstPositions[];

     /*     用空间代时间，把数据中的每个position对应的section index存下来
      *     如：
      *     sectionIndexes的下标        sectionIndexes数组中的值（section的下标）
      *             0                          0
      *             1                        0
      *             2                        1
      *             3                        1
      *             4                        2
      *             5                        2
      *             6                        3
      *             ...                        ...
      */
     int sectionIndexes[];//保存每个position对应的section index

     Character sections[];

     /*private String countries[]= {
             "A",
             "Afghanistan", "Albania", "Algeria", "American Samoa",
             "Andorra", "Angola", "Anguilla", "Antarctica",
             "Antigua and Barbuda", "Argentina", "Armenia", "Aruba",
             "Australia", "Austria", "Azerbaijan",
             "B",
             "Bahrain", "Bangladesh","Barbados", "Belarus", "Belgium",
             "Belize", "Benin", "Bermuda","Bhutan", "Bolivia",
             "Bosnia and Herzegovina", "Botswana","Bouvet Island",
             "Brazil", "British Indian Ocean Territory","British Virgin Islands",
             "Brunei", "Bulgaria", "Burkina Faso","Burundi",
             "C",
             "Cote d'Ivoire", "Cambodia", "Cameroon", "Canada","Cape Verde",
             "Cayman Islands", "Central African Republic", "Chad",
             "Chile", "China", "Christmas Island", "Cocos (Keeling) Islands",
             "Colombia", "Comoros", "Congo", "Cook Islands", "Costa Rica",
             "Croatia", "Cuba", "Cyprus", "Czech Republic",
             "D",
             "Democratic Republic of the Congo", "Denmark", "Djibouti",
             "Dominica", "Dominican Republic",
             "E",
             "East Timor", "Ecuador", "Egypt",
             "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia","Ethiopia",
             "F",
             "Faeroe Islands", "Falkland Islands", "Fiji",
             "Finland", "Former Yugoslav Republic of Macedonia", "France",
             "French Guiana", "French Polynesia", "French Southern Territories",
             "G",
             "Gabon", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece",
             "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala",
             "Guinea", "Guinea-Bissau", "Guyana",
             "H",
             "Haiti","Heard Island and McDonald Islands", "Honduras", "Hong Kong","Hungary",
             "I",
             "Iceland", "India", "Indonesia", "Iran", "Iraq","Ireland", "Israel","Italy",
             "J",
             "Jamaica", "Japan", "Jordan",
             "K",
             "Kazakhstan", "Kenya", "Kiribati", "Kuwait", "Kyrgyzstan",
             "L",
             "Laos","Latvia", "Lebanon", "Lesotho", "Liberia", "Libya",
             "Liechtenstein", "Lithuania", "Luxembourg",
             "M",
             "Macau", "Madagascar","Malawi", "Malaysia", "Maldives", "Mali", "Malta",
             "Marshall Islands", "Martinique", "Mauritania", "Mauritius",
             "Mayotte", "Mexico", "Micronesia", "Moldova", "Monaco", "Mongolia",
             "Montserrat", "Morocco", "Mozambique", "Myanmar",
             "N",
             "Namibia","Nauru", "Nepal", "Netherlands", "Netherlands Antilles",
             "New Caledonia", "New Zealand", "Nicaragua", "Niger", "Nigeria",
             "Niue", "Norfolk Island", "North Korea", "Northern Marianas",
             "Norway",
             "O",
             "Oman",
             "P",
             "Pakistan", "Palau", "Panama",
             "Papua New Guinea", "Paraguay", "Peru", "Philippines",
             "Pitcairn Islands", "Poland", "Portugal", "Puerto Rico",
             "Q",
             "Qatar",
             "R",
             "Reunion", "Romania", "Russia", "Rwanda",
             "S",
             "Sqo Tome and Principe",
             "Saint Helena", "Saint Kitts and Nevis", "Saint Lucia",
             "Saint Pierre and Miquelon", "Saint Vincent and the Grenadines",
             "Samoa", "San Marino", "Saudi Arabia", "Senegal", "Seychelles",
             "Sierra Leone", "Singapore", "Slovakia", "Slovenia",
             "Solomon Islands", "Somalia", "South Africa",
             "South Georgia and the South Sandwich Islands", "South Korea",
             "Spain", "Sri Lanka", "Sudan", "Suriname",
             "Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland","Syria",
             "T",
             "Taiwan", "Tajikistan", "Tanzania", "Thailand",
             "The Bahamas", "The Gambia", "Togo", "Tokelau", "Tonga",
             "Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan",
             "Turks and Caicos Islands", "Tuvalu",
             "U",
             "Uganda","Ukraine", "United Arab Emirates", "United Kingdom",
             "United States", "United States Minor Outlying Islands", "Uruguay","Uzbekistan",
             "V",
             "Vanuatu", "Vatican City", "Venezuela", "Vietnam", "Virgin Islands",
             "W",
             "Wallis and Futuna", "Western Sahara",
             "Y",
             "Yemen", "Yugoslavia",
             "Z",
             "Zambia", "Zimbabwe" };
 */
     private String countries[]= {
             "A",
             "啊有", "啊有2", "啊1有",
             "啊有3", "爱有3", "爱有4", "暗3","暗32",
             "B",
             "把工和1", "把工2和","把1工和", "把工2和", "把工4和",
             "白2为", "冰的","冰的2", "冰的3","布是","部公","爸五","兵妥",
             "兵妥2","兵妥3","兵妥4",
             "C",
             "草莓", "参数", "次国粗", "操类1", "操类2", "操类3", "操类4", "操类5", "操类6",
             "操类7","粗3","粗33","粗34","粗35","粗36",
             "D",
             "吊炮","灯具","都产遥","顶为","大有","端人在","电中工","到这要","当遥1",
             "当遥2","当遥3","当遥4","当遥5"
             };
     void initSections(){
         //假设countries已经排序,本例中确实已经排序
         //把section对应的第一条数据的position存下来
         ArrayList<Integer> tmpFirstPositions = new ArrayList<Integer>();
         ArrayList<Character> tmpSections = new ArrayList<Character>();
         sectionIndexes = new int[countries.length];
         char lastChar = '\0';
         int index = -;
         for (int i = ; i < countries.length; i++) {
             String country = countries[i];
             char ch = country.charAt();
             if (ch != lastChar) {
                 //只存第一条数据的position,其它的跳过。
                 tmpSections.add(ch);//增加一个section
                 tmpFirstPositions.add(i);//增加该section的第一条记录的位置
                 ++index;
             }
             lastChar = ch;
             sectionIndexes[i] = index;
         }
         sections = new Character[tmpSections.size()];
         tmpSections.toArray(sections);

         firstPositions = new Integer[tmpFirstPositions.size()];
         tmpFirstPositions.toArray(firstPositions);
     }

     public GroupsFastScrollAdapter(Context ctxt){
         context = ctxt;
         inflater = LayoutInflater.from(context);
         initSections();
     }

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

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

     @Override
     public int getItemViewType(int position) {
         if (countries[position].length() == ) {
             return ;
         }
         return ;
     }

     @Override
     public int getViewTypeCount() {
         return ;
     }

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

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

         if (getItemViewType(position) == ) {//group
             if(convertView == null){
                 convertView = inflater.inflate(android.R.layout.simple_list_item_1, parent,false);
             }
             convertView.setBackgroundColor(Color.parseColor("#C9C9C9"));
             TextView group = (TextView) convertView.findViewById(android.R.id.text1);
             group.setText(countries[position]);
             ViewGroup.LayoutParams param = convertView.getLayoutParams();
 //            param.height = ViewGroup.LayoutParams.WRAP_CONTENT;
             param.height = ;

         }else{
             if(convertView == null){
                 convertView = inflater.inflate(R.layout.list_item_custom_fs, parent,false);
             }
             TextView tv = (TextView) convertView.findViewById(R.id.tv_content);
             tv.setText(countries[position]);
         }
         return convertView;
     }

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

     @Override
     public int getPositionForSection(int sectionIndex) {
         sectionIndex %= sections.length;
         return firstPositions[sectionIndex];
     }

     @Override
     public int getSectionForPosition(int position) {
         return sectionIndexes[position];
     }
 }

 import android.app.Fragment;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ListView;

 import com.example.fastscroll.R;

 public class GroupsFastScrollFrgmt extends Fragment {
     ListView listview;
     GroupsFastScrollAdapter adapter;

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         View v = inflater.inflate(R.layout.frgmt_groups_and_fastscroll, container,false);
         listview = (ListView) v.findViewById(R.id.list_groups_fs);

         adapter = new GroupsFastScrollAdapter(getActivity());
         listview.setAdapter(adapter);
         return v;
     }
 }

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >

     <ListView
         android:id="@+id/list_groups_fs"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:fastScrollEnabled="true"
         >
     </ListView>

 </LinearLayout>

fastscroll的样式

 　　<style name="CustomFastScrollTheme" parent="AppBaseTheme">
         <!-- api21 -->
         <!-- <item name="android:fastScrollStyle">@style/CustomFastScrollTheme</item> -->

         <item name="android:fastScrollThumbDrawable">@drawable/fastscroll_thumb_aje</item>
         <item name="android:fastScrollOverlayPosition">atThumb</item>
         <item name="android:fastScrollTextColor">#DA4A38</item>
         <!-- <item name="android:fastScrollTrackDrawable">@drawable/us</item> -->
         <item name="android:fastScrollPreviewBackgroundRight">@drawable/fastscroll_preview_right</item>
     </style>