SectionIndexer 的使用（联系人分类索引）

推荐安卓开发神器（里面有各种UI特效和android代码库实例）

// 获取标题栏索引
int position = sectionIndexter.getPositionForSection(l[idx]);
 if (position == -1) {
 returntrue;
 }
 // 设置调整到指定区域
 list.setSelection(position);

 

1. Main.xml

 

<?xmlversion="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">
<ListViewandroid: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;
publicclass MyAdapter extends BaseAdapter implements SectionIndexer {
 private ArrayList<String> stringArray;
 private Context context;
 public MyAdapter(Context _context, ArrayList<String> arr) {
 stringArray = arr;
 context = _context;
 }
 publicint getCount() {
 return stringArray.size();
 }
 public Object getItem(int arg0) {
 return stringArray.get(arg0);
 }
 publiclong getItemId(int arg0) {
 return0;
 }
 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;
 }
 privatevoid 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);
 }
 publicint getPositionForSection(int section) {
 if (section == 35) {
 return0;
 }
 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;
 }
 publicint getSectionForPosition(int arg0) {
 return0;
 }
 public Object[] getSections() {
 returnnull;
 }
}

 

 

 

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;
publicclass SideBar extends View {
 privatechar[] l;
 private SectionIndexer sectionIndexter = null;
 private ListView list;
 privatefinalint m_nItemHeight = 29;
 public SideBar(Context context) {
 super(context);
 init();
 }
 public SideBar(Context context, AttributeSet attrs) {
 super(context, attrs);
 init();
 }
 privatevoid init() {
 l = newchar[] { '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();
 }
 publicvoid setListView(ListView _list) {
 list = _list;
 sectionIndexter = (SectionIndexer) _list.getAdapter();
 }
 publicboolean onTouchEvent(MotionEvent event) {
 super.onTouchEvent(event);
 int i = (int) event.getY();
 int idx = i / m_nItemHeight;
 if (idx >= l.length) {
 idx = l.length - 1;
 } elseif (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) {
 returntrue;
 }
 list.setSelection(position);
 }
 returntrue;
 }
 protectedvoid 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;
publicclass Main extends Activity {
 /** Called when the activity is first created. */
 @Override
 publicvoid 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;
 }
}