第一步是实现字母的a-z的控件的显示：
import android.content.Context;import
android.graphics.Bitmap;import
android.graphics.BitmapFactory;import
android.graphics.Canvas;import
android.graphics.Paint;import
android.graphics.Paint.Style;import
android.graphics.drawable.ColorDrawable;import
android.util.AttributeSet;import
android.view.MotionEvent;import
android.view.View;import
android.widget.HeaderViewListAdapter;import
android.widget.ListView;import
android.widget.SectionIndexer;import
android.widget.TextView;public
class SideBar extendsView { privatechar[] l; privateSectionIndexer sectionIndexter =
null; privateListView list; privateTextView mDialogText; Bitmap mbitmap; privateint
type = 1; privateint
color = 0xff858c94; publicSideBar(Context context) { super(context); init(); } publicSideBar(Context context, AttributeSet attrs) { super(context, attrs); init(); } privatevoid
init() { l =new
char[] {‘!‘,‘A‘,‘B‘,
‘C‘,‘D‘,
‘E‘,‘F‘,
‘G‘,‘H‘, ‘I‘,‘J‘,
‘K‘,‘L‘,
‘M‘,‘N‘,
‘O‘,‘P‘,
‘Q‘,‘R‘,
‘S‘,‘T‘,
‘U‘,‘V‘, ‘W‘,‘X‘,
‘Y‘,‘Z‘,‘#‘}; mbitmap = BitmapFactory.decodeResource(getResources(), R.drawable.scroll_bar_search_icon); } publicSideBar(Context context, AttributeSet attrs,
intdefStyle) { super(context, attrs, defStyle); init(); } publicvoid
setListView(ListView _list) { list = _list; HeaderViewListAdapter ha = (HeaderViewListAdapter) _list .getAdapter(); MyAdapter ad = (MyAdapter)ha.getWrappedAdapter(); sectionIndexter = (SectionIndexer) ad; } publicvoid
setTextView(TextView mDialogText) { this.mDialogText = mDialogText; } publicboolean
onTouchEvent(MotionEvent event) { super.onTouchEvent(event); inti = (int) event.getY(); intidx = i / (getMeasuredHeight() / l.length); if(idx >= l.length) { idx = l.length -1; }else
if(idx < 0) { idx =0; } if(event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) { setBackgroundResource(R.drawable.scrollbar_bg); mDialogText.setVisibility(View.VISIBLE); if(idx ==
0) { mDialogText.setText("Search"); mDialogText.setTextSize(16); }else
{ mDialogText.setText(String.valueOf(l[idx])); mDialogText.setTextSize(34); } if(sectionIndexter ==
null) { sectionIndexter = (SectionIndexer) list.getAdapter(); } intposition = sectionIndexter.getPositionForSection(l[idx]); if(position == -1) { returntrue; } list.setSelection(position); }else
{ mDialogText.setVisibility(View.INVISIBLE); } if(event.getAction() == MotionEvent.ACTION_UP) { setBackgroundDrawable(newColorDrawable(0x00000000)); } returntrue; } protectedvoid
onDraw(Canvas canvas) { Paint paint =new
Paint(); paint.setColor(color); paint.setTextSize(12); paint.setStyle(Style.FILL); paint.setTextAlign(Paint.Align.CENTER); floatwidthCenter = getMeasuredWidth() /
2; if(l.length >
0) { floatheight = getMeasuredHeight() / l.length; for(int
i = 0; i < l.length; i++) { if(i ==
0 && type !=
2) { canvas.drawBitmap(mbitmap, widthCenter -7, (i +
1) * height - height /2, paint); }else canvas.drawText(String.valueOf(l[i]), widthCenter, (i +1) * height, paint); } } this.invalidate(); super.onDraw(canvas); }}
第二步：设计XML
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:divider="@null" />
<com.example.listsildedel.SideBar
android:id="@+id/sideBar"
android:layout_width="25dp"
android:layout_height="wrap_content"
android:layout_gravity="right|center_vertical" />
</FrameLayout>
第三步：继承BaseAdapter并实现SectionIndexer接口，并且Item是通过当字母重复的时候进行隐藏 ，不重复时显示。
import
java.util.List;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;public
class MyAdapter extendsBaseAdapter
implementsSectionIndexer{ privateList<Content> list =
null; privateContext mContext; privateSectionIndexer mIndexer; publicMyAdapter(Context mContext, List<Content> list) { this.mContext = mContext; this.list = list; } publicint
getCount() { returnthis.list.size(); } publicObject getItem(intposition) { returnnull; } publiclong
getItemId(intposition) { returnposition; } publicView getView(finalint
position, View view, ViewGroup arg2) { ViewHolder viewHolder =null; if(view ==
null) { viewHolder =new
ViewHolder(); view = LayoutInflater.from(mContext).inflate(R.layout.item,null); viewHolder.tvTitle = (TextView) view.findViewById(R.id.title); viewHolder.tvLetter = (TextView) view.findViewById(R.id.catalog); view.setTag(viewHolder); }else
{ viewHolder = (ViewHolder) view.getTag(); } finalContent mContent = list.get(position); if(position ==
0) { viewHolder.tvLetter.setVisibility(View.VISIBLE); viewHolder.tvLetter.setText(mContent.getLetter()); }else
{ String lastCatalog = list.get(position -1).getLetter(); if(mContent.getLetter().equals(lastCatalog)) { viewHolder.tvLetter.setVisibility(View.GONE); }else
{ viewHolder.tvLetter.setVisibility(View.VISIBLE); viewHolder.tvLetter.setText(mContent.getLetter()); } } viewHolder.tvTitle.setText(this.list.get(position).getName()); returnview; } finalstatic
class ViewHolder { TextView tvTitle; TextView tvLetter; } publicObject[] getSections() { // TODO Auto-generated method stub returnnull; } publicint
getSectionForPosition(intposition) { return0; } publicint
getPositionForSection(intsection) { Content mContent; String l; if(section ==
‘!‘) { return0; }else
{ for(int
i = 0; i < getCount(); i++) { mContent = (Content) list.get(i); l = mContent.getLetter(); charfirstChar = l.toUpperCase().charAt(0); if(firstChar == section) { returni +
1; } } } mContent =null; l =null; return-1; }}import
java.util.ArrayList;import
java.util.Collections;import
java.util.List;import
android.app.Activity;import
android.content.Context;import
android.graphics.PixelFormat;import
android.os.Bundle;import
android.view.LayoutInflater;import
android.view.View;import
android.view.WindowManager;import
android.widget.LinearLayout.LayoutParams;import
android.widget.ListView;import
android.widget.TextView;public
class MainActivity extendsActivity { privateListView mListView; privateSideBar indexBar; privateWindowManager mWindowManager; privateTextView mDialogText; privateView head; @Override publicvoid
onCreate(Bundle savedInstanceState) { //启动activity时不自动弹出软键盘 getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView)this.findViewById(R.id.list); indexBar = (SideBar) findViewById(R.id.sideBar); mDialogText = (TextView) LayoutInflater.from(this).inflate(R.layout.list_position,null); head = LayoutInflater.from(this).inflate(R.layout.head,null); mListView.addHeaderView(head); mDialogText.setVisibility(View.INVISIBLE); mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE); WindowManager.LayoutParams lp =new
WindowManager.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_APPLICATION, WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT); mWindowManager.addView(mDialogText, lp); indexBar.setTextView(mDialogText); //初始化数据 List<Content> list =new
ArrayList<Content>(); for(int
i = 0; i <
10; i++) { Content m; if(i <
3) m =new
Content("A","选项"
+ i); elseif
(i < 6) m =new
Content("F","选项"
+ i); else m =new
Content("D","选项"
+ i); list.add(m); } //根据a-z进行排序 Collections.sort(list,new
PinyinComparator()); // 实例化自定义内容适配类 MyAdapter adapter =new
MyAdapter(this, list); // 为listView设置适配 mListView.setAdapter(adapter); //设置SideBar的ListView内容实现点击a-z中任意一个进行定位 indexBar.setListView(mListView); }}android listView 根据字母排序和定位 （http://www.apkbus.com/android-69999-1-1.html）
原文：http://blog.csdn.net/chenlang888/article/details/46050253