ListView索引实现demo

      今天突然来了灵感，把一直想实现的ListView索引实现了，写了一个小demo，拿出来与大家一起分享，希望对大家有帮助，同时也希望大家能提出宝贵意见，优化此demo，或者提供更好的实现方法！

      demo  如下：

      1、.xml文件如下：

           main.xml：

           <?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_ android:layout_><ListView android:id="@+id/listView"android:layout_ android:layout_android:drawSelectorOnTop="false"/><ListView android:id="@+id/listViewIndex"android:gravity="right"android:layout_ android:layout_/></LinearLayou

           my_simple_expandable_list_item.xml：

           <?xml version="1.0" encoding="utf-8"?><TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/indexitem" android:layout_ android:layout_ android:gravity="center_horizontal" android:textSize="15dp"></TextView>

      2、.java文件如

           MainActivity.java

           package com.cn.lhq;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.TextView;import android.widget.AdapterView.OnItemClickListener;public class MainActivity extends Activity {private ListView lv;private ListView index;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);lv = (ListView) findViewById(R.id.listView);index = (ListView) findViewById(R.id.listViewIndex);// 去掉ListView中的分割线index.setDividerHeight(0);// 去掉ListView中的滚动条index.setVerticalScrollBarEnabled(false);// 为主ListView添加数据lv.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_expandable_list_item_1, getListViewData()));// 为索引ListView添加数据index.setAdapter(new ArrayAdapter<String>(this,R.layout.my_simple_expandable_list_item, getIndexData()));// 索引ListView点击事件index.setOnItemClickListener(new OnItemClickListener() {public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {lv.setSelectionFromTop(8, 0);CharSequence cs = ((TextView) arg1).getText();if ("A".equals(cs)) {lv.setSelectionFromTop(0, 0);} else if ("B".equals(cs)) {lv.setSelectionFromTop(1, 0);} else if ("C".equals(cs)) {lv.setSelectionFromTop(2, 0);} else if ("D".equals(cs)) {lv.setSelectionFromTop(3, 0);} else if ("E".equals(cs)) {lv.setSelectionFromTop(4, 0);} else if ("F".equals(cs)) {lv.setSelectionFromTop(5, 0);} else if ("G".equals(cs)) {lv.setSelectionFromTop(6, 0);} else if ("H".equals(cs)) {lv.setSelectionFromTop(7, 0);} else if ("I".equals(cs)) {lv.setSelectionFromTop(8, 0);} else if ("J".equals(cs)) {lv.setSelectionFromTop(9, 0);} else if ("K".equals(cs)) {lv.setSelectionFromTop(10, 0);} else if ("L".equals(cs)) {lv.setSelectionFromTop(11, 0);} else if ("M".equals(cs)) {lv.setSelectionFromTop(12, 0);} else if ("N".equals(cs)) {lv.setSelectionFromTop(13, 0);} else if ("O".equals(cs)) {lv.setSelectionFromTop(14, 0);} else if ("P".equals(cs)) {lv.setSelectionFromTop(15, 0);} else if ("Q".equals(cs)) {lv.setSelectionFromTop(16, 0);} else if ("R".equals(cs)) {lv.setSelectionFromTop(17, 0);} else if ("S".equals(cs)) {lv.setSelectionFromTop(18, 0);} else if ("T".equals(cs)) {lv.setSelectionFromTop(19, 0);} else if ("U".equals(cs)) {lv.setSelectionFromTop(20, 0);} else if ("V".equals(cs)) {lv.setSelectionFromTop(21, 0);} else if ("W".equals(cs)) {lv.setSelectionFromTop(22, 0);} else if ("X".equals(cs)) {lv.setSelectionFromTop(23, 0);} else if ("Y".equals(cs)) {lv.setSelectionFromTop(24, 0);} else if ("Z".equals(cs)) {lv.setSelectionFromTop(25, 0);}Log.i("test", cs + " is clicked");}});}private List<String> getListViewData() {List<String> data = new ArrayList<String>();data.add("测试数据1");data.add("测试数据2");data.add("测试数据3");data.add("测试数据4");data.add("测试数据5");data.add("测试数据6");data.add("测试数据7");data.add("测试数据8");data.add("测试数据9");data.add("测试数据10");data.add("测试数据11");data.add("测试数据12");data.add("测试数据13");data.add("测试数据14");data.add("测试数据15");data.add("测试数据16");data.add("测试数据17");data.add("测试数据18");data.add("测试数据19");data.add("测试数据20");data.add("测试数据21");data.add("测试数据22");data.add("测试数据23");data.add("测试数据24");data.add("测试数据25");data.add("测试数据26");return data;}private List<String> getIndexData() {List<String> data = new ArrayList<String>();data.add("A");data.add("B");data.add("C");data.add("D");data.add("E");data.add("F");data.add("G");data.add("H");data.add("I");data.add("J");data.add("K");data.add("M");data.add("N");data.add("O");data.add("P");data.add("Q");data.add("R");data.add("S");data.add("T");data.add("U");data.add("V");data.add("W");data.add("X");data.add("Y");data.add("Z");return data;}}