SectionIndexer 的施用（联系人分类索引）
SectionIndexer 的使用（联系人分类索引）?// 获取标题栏索引int?position??sectionIndexter.getPositionFo
SectionIndexer 的使用（联系人分类索引）
?
- // 获取标题栏索引
- int?position?=?sectionIndexter.getPositionForSection(l[idx]);??
- ????????????if?(position?==?-1)?{??
- ????????????????return?true;??
- ????????????}??
- ? ? // 设置调整到指定区域
- ????????????list.setSelection(position);?
?
1. Main.xml
?
<?xml?version="1.0"?encoding="utf-8"?>??<RelativeLayout??????xmlns:android="http://schemas.android.com/apk/res/android"??????android:layout_width="fill_parent"??????android:layout_height="fill_parent">??<ListView?android:id="@+id/myListView"??????android:layout_width="fill_parent"??????android:layout_height="fill_parent"??/>??<android.test.SideBar??????android:id?=?"@+id/sideBar"??????android:layout_height="fill_parent"??????android:layout_width="22px"??????android:layout_alignParentRight="true"??/>??</RelativeLayout>???
?
?
2. listview_row.xml
?
<?xml?version="1.0"?encoding="utf-8"?>??<LinearLayout??????xmlns:android="http://schemas.android.com/apk/res/android"??????android:orientation="vertical"??????android:layout_width="fill_parent"??????android:layout_height="wrap_content">??<LinearLayout??????android:id="@+id/section"??????android:layout_width="fill_parent"??????android:layout_height="wrap_content"??/>??<TextView?android:id="@+id/textView"??????android:layout_width="wrap_content"??????android:layout_height="80sp"??????android:textSize="45sp"??/>??</LinearLayout>???
?
?
3. MyAdapter.java
?
package?android.test;??import?java.util.ArrayList;??import?android.app.Activity;??import?android.content.Context;??import?android.graphics.Color;??import?android.view.Gravity;??import?android.view.LayoutInflater;??import?android.view.View;??import?android.view.ViewGroup;??import?android.widget.BaseAdapter;??import?android.widget.LinearLayout;??import?android.widget.SectionIndexer;??import?android.widget.TextView;??public?class?MyAdapter?extends?BaseAdapter?implements?SectionIndexer?{??????private?ArrayList<String>?stringArray;??????private?Context?context;??????public?MyAdapter(Context?_context,?ArrayList<String>?arr)?{??????????stringArray?=?arr;??????????context?=?_context;??????}??????public?int?getCount()?{??????????return?stringArray.size();??????}??????public?Object?getItem(int?arg0)?{??????????return?stringArray.get(arg0);??????}??????public?long?getItemId(int?arg0)?{??????????return?0;??????}??????public?View?getView(int?position,?View?v,?ViewGroup?parent)?{??????????LayoutInflater?inflate?=?((Activity)?context).getLayoutInflater();??????????View?view?=?(View)?inflate.inflate(R.layout.listview_row,?null);??????????LinearLayout?header?=?(LinearLayout)?view.findViewById(R.id.section);??????????String?label?=?stringArray.get(position);??????????char?firstChar?=?label.toUpperCase().charAt(0);??????????if?(position?==?0)?{??????????????setSection(header,?label);??????????}?else?{??????????????String?preLabel?=?stringArray.get(position?-?1);??????????????char?preFirstChar?=?preLabel.toUpperCase().charAt(0);??????????????if?(firstChar?!=?preFirstChar)?{??????????????????setSection(header,?label);??????????????}?else?{??????????????????header.setVisibility(View.GONE);??????????????}??????????}??????????TextView?textView?=?(TextView)?view.findViewById(R.id.textView);??????????textView.setText(label);??????????return?view;??????}??????private?void?setSection(LinearLayout?header,?String?label)?{??????????TextView?text?=?new?TextView(context);??????????header.setBackgroundColor(0xffaabbcc);??????????text.setTextColor(Color.WHITE);??????????text.setText(label.substring(0,?1).toUpperCase());??????????text.setTextSize(20);??????????text.setPadding(5,?0,?0,?0);??????????text.setGravity(Gravity.CENTER_VERTICAL);??????????header.addView(text);??????}??????public?int?getPositionForSection(int?section)?{??????????if?(section?==?35)?{??????????????return?0;??????????}??????????for?(int?i?=?0;?i?<?stringArray.size();?i++)?{??????????????String?l?=?stringArray.get(i);??????????????char?firstChar?=?l.toUpperCase().charAt(0);??????????????if?(firstChar?==?section)?{??????????????????return?i;??????????????}??????????}??????????return?-1;??????}??????public?int?getSectionForPosition(int?arg0)?{??????????return?0;??????}??????public?Object[]?getSections()?{??????????return?null;??????}??}???
?
?
4.? SideBar.java
?
package?android.test;??import?android.content.Context;??import?android.graphics.Canvas;??import?android.graphics.Paint;??import?android.util.AttributeSet;??import?android.view.MotionEvent;??import?android.view.View;??import?android.widget.ListView;??import?android.widget.SectionIndexer;??public?class?SideBar?extends?View?{??????private?char[]?l;??????private?SectionIndexer?sectionIndexter?=?null;??????private?ListView?list;??????private?final?int?m_nItemHeight?=?29;??????public?SideBar(Context?context)?{??????????super(context);??????????init();??????}??????public?SideBar(Context?context,?AttributeSet?attrs)?{??????????super(context,?attrs);??????????init();??????}??????private?void?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'?};??????????setBackgroundColor(0x44FFFFFF);??????}??????public?SideBar(Context?context,?AttributeSet?attrs,?int?defStyle)?{??????????super(context,?attrs,?defStyle);??????????init();??????}??????public?void?setListView(ListView?_list)?{??????????list?=?_list;??????????sectionIndexter?=?(SectionIndexer)?_list.getAdapter();??????}??????public?boolean?onTouchEvent(MotionEvent?event)?{??????????super.onTouchEvent(event);??????????int?i?=?(int)?event.getY();??????????int?idx?=?i?/?m_nItemHeight;??????????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)?{??????????????if?(sectionIndexter?==?null)?{??????????????????sectionIndexter?=?(SectionIndexer)?list.getAdapter();??????????????}??????????????int?position?=?sectionIndexter.getPositionForSection(l[idx]);??????????????if?(position?==?-1)?{??????????????????return?true;??????????????}??????????????list.setSelection(position);??????????}??????????return?true;??????}??????protected?void?onDraw(Canvas?canvas)?{??????????Paint?paint?=?new?Paint();??????????paint.setColor(0xFFA6A9AA);??????????paint.setTextSize(20);??????????paint.setTextAlign(Paint.Align.CENTER);??????????float?widthCenter?=?getMeasuredWidth()?/?2;??????????for?(int?i?=?0;?i?<?l.length;?i++)?{??????????????canvas.drawText(String.valueOf(l[i]),?widthCenter,?m_nItemHeight?+?(i?*?m_nItemHeight),?paint);??????????}??????????super.onDraw(canvas);??????}??}???
?
?
5. Main.java
?
package?android.test;??import?java.util.ArrayList;??import?android.app.Activity;??import?android.os.Bundle;??import?android.widget.ListView;??public?class?Main?extends?Activity?{??????/**?Called?when?the?activity?is?first?created.?*/??????@Override??????public?void?onCreate(Bundle?savedInstanceState)?{??????????super.onCreate(savedInstanceState);??????????setContentView(R.layout.main);??????????ListView?list?=?(ListView)?findViewById(R.id.myListView);??????????ArrayList<String>?stringList?=?InitListViewData();??????????MyAdapter?adapter?=?new?MyAdapter(this,?stringList);??????????list.setAdapter(adapter);??????????SideBar?indexBar?=?(SideBar)?findViewById(R.id.sideBar);??????????indexBar.setListView(list);??????}??????private?ArrayList<String>?InitListViewData()?{??????????ArrayList<String>?stringList?=?new?ArrayList<String>();??????????stringList.add("aback");??????????stringList.add("abash");??????????stringList.add("abbey");??????????stringList.add("abhor");??????????stringList.add("abide");??????????stringList.add("abuse");??????????stringList.add("candidate");??????????stringList.add("capture");??????????stringList.add("careful");??????????stringList.add("catch");??????????stringList.add("cause");??????????stringList.add("celebrate");??????????stringList.add("forever");??????????stringList.add("fable");??????????stringList.add("fidelity");??????????stringList.add("fox");??????????stringList.add("funny");??????????stringList.add("fail");??????????stringList.add("jail");??????????stringList.add("jade");??????????stringList.add("jailor");??????????stringList.add("january");??????????stringList.add("jasmine");??????????stringList.add("jazz");??????????stringList.add("zero");??????????stringList.add("zoo");??????????stringList.add("zeus");??????????stringList.add("zebra");??????????stringList.add("zest");??????????stringList.add("zing");??????????return?stringList;??????}??} ??
?
