android联系人索引

引入jar包：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/activity_main"android:layout_width="match_parent"android:layout_height="match_parent"tools:context="com.example.administrator.indexconnectperson.MainActivity"><ListViewandroid:id="@+id/listview"android:layout_width="match_parent"android:layout_height="match_parent" /><TextViewandroid:id="@+id/word"android:layout_width="50dp"android:layout_height="50dp"android:layout_centerInParent="true"android:background="@drawable/bg_word"android:gravity="center"android:text="A"android:textColor="#ffff"android:textSize="20sp"android:visibility="gone" /><LinearLayoutandroid:layout_width="30dp"android:layout_height="match_parent"android:layout_alignParentRight="true"android:orientation="vertical"android:paddingTop="20dp"android:background="@drawable/bg_index"android:paddingBottom="20dp"android:layout_margin="10dp"><com.example.administrator.indexconnectperson.ConnectPersonIndexandroid:id="@+id/connect_person_index"android:layout_width="30dp"android:layout_height="match_parent"/></LinearLayout>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle"><corners android:radius="8dp"/><solid android:color="#88000000"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle"><corners android:radius="50dp"/><solid android:color="#44000000"/>
</shape>

package com.example.administrator.indexconnectperson;import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;/*** Created by Administrator on 2017/5/17.*/public class ConnectPersonIndex extends View {private int itemWidth;private int itemHeight;private String[] words = {"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"};private Paint paint;private int currentIndex = -1;public ConnectPersonIndex(Context context, AttributeSet attrs) {super(context, attrs);initView();}private void initView() {paint = new Paint();paint.setColor(Color.WHITE);paint.setTextSize(30);paint.setAntiAlias(true);paint.setTypeface(Typeface.DEFAULT_BOLD);//字体加粗}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);itemWidth = getMeasuredWidth();itemHeight = getMeasuredHeight() / words.length;}@Overridepublic boolean onTouchEvent(MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:case MotionEvent.ACTION_MOVE:float Y = event.getY();float index = Y / itemHeight;if (index != currentIndex) {currentIndex = (int) index;onIndextListener.onIndexWordListener(words[currentIndex]);}invalidate();break;case MotionEvent.ACTION_UP:currentIndex = -1;invalidate();break;}return true;}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);for (int i = 0; i < words.length; i++) {if (currentIndex == i) {paint.setColor(Color.GRAY);} else {paint.setColor(Color.WHITE);}String word = words[i];Rect rect = new Rect();paint.getTextBounds(word, 0, 1, rect);int wordWidth = rect.width();int wordHeight = rect.height();float wordX = itemWidth / 2 - wordWidth / 2;float wordY = itemHeight / 2 + wordHeight / 2 + i * itemHeight;canvas.drawText(word, wordX, wordY, paint);}}private OnIndextListener onIndextListener;public void setOnIndextListener(OnIndextListener onIndextListener) {this.onIndextListener = onIndextListener;}interface OnIndextListener {void onIndexWordListener(String word);}
}

package com.example.administrator.indexconnectperson;import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;/*** Created by Administrator on 2017/5/17.* 把汉字转换成拼音*/public class PinYinUtils {/*** 得到指定汉字的拼音* 注意:不应该被频繁调用，它消耗一定内存* @param hanzi* @return*/public static String getPinYin(String hanzi){String pinyin = "";HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();//控制转换是否大小写，是否带音标format.setCaseType(HanyuPinyinCaseType.UPPERCASE);//大写format.setToneType(HanyuPinyinToneType.WITHOUT_TONE);//由于不能直接对多个汉字转换，只能对单个汉字转换char[] arr = hanzi.toCharArray();for (int i = 0; i < arr.length; i++) {if(Character.isWhitespace(arr[i]))continue;//如果是空格，则不处理，进行下次遍历//汉字是2个字节存储，肯定大于127，所以大于127就可以当为汉字转换if(arr[i]>127){try {//由于多音字的存在，单 dan shanString[] pinyinArr = PinyinHelper.toHanyuPinyinStringArray(arr[i], format);if(pinyinArr!=null){pinyin += pinyinArr[0];}else {pinyin += arr[i];}} catch (BadHanyuPinyinOutputFormatCombination e) {e.printStackTrace();//不是正确的汉字pinyin += arr[i];}}else {//不是汉字，pinyin += arr[i];}}return pinyin;}
}

package com.example.administrator.indexconnectperson;/*** Created by Administrator on 2017/5/17.*/public class Person {private String name;private String pinyin;public Person(String name) {this.name = name;this.pinyin = PinYinUtils.getPinYin(name);}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPinyin() {return pinyin;}public void setPinyin(String pinyin) {this.pinyin = pinyin;}@Overridepublic String toString() {return "Person{" +"name='" + name + '\'' +", pinyin='" + pinyin + '\'' +'}';}
}

package com.example.administrator.indexconnectperson;import android.os.Bundle;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;public class MainActivity extends AppCompatActivity {private ListView listview;private TextView word;private ConnectPersonIndex connectIndex;private Handler mHandler = new Handler();private ArrayList<Person> persons;private MyAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initView();initDatas();initEvent();}private void initView() {listview = (ListView) findViewById(R.id.listview);word = (TextView) findViewById(R.id.word);connectIndex = (ConnectPersonIndex) findViewById(R.id.connect_person_index);}private void initDatas() {persons = new ArrayList<>();persons.add(new Person("刘涛"));persons.add(new Person("蒋欣"));persons.add(new Person("王子文"));persons.add(new Person("杨紫"));persons.add(new Person("乔欣"));persons.add(new Person("祖峰"));persons.add(new Person("王凯"));persons.add(new Person("张陆"));persons.add(new Person("靳东"));persons.add(new Person("杨烁"));persons.add(new Person("张晓谦"));persons.add(new Person("郭晓然"));persons.add(new Person("陈牧扬"));persons.add(new Person("王永泉"));persons.add(new Person("丁勇岱"));persons.add(new Person("宁文彤"));persons.add(new Person("吴昊宸"));persons.add(new Person("穆丽燕"));persons.add(new Person("冯晖"));persons.add(new Person("谭希和"));persons.add(new Person("刘敏涛"));persons.add(new Person("康群智"));persons.add(new Person("岳旸"));persons.add(new Person("赵千紫"));persons.add(new Person("胡伊静"));persons.add(new Person("隋雨蒙"));persons.add(new Person("朱梦瑶"));persons.add(new Person("石云鹏"));persons.add(new Person("安悦溪"));persons.add(new Person("安以轩"));persons.add(new Person("包贝尔"));//排序Collections.sort(persons, new Comparator<Person>() {@Overridepublic int compare(Person lhs, Person rhs) {return lhs.getPinyin().compareTo(rhs.getPinyin());}});adapter = new MyAdapter();listview.setAdapter(adapter);}private void initEvent() {connectIndex.setOnIndextListener(new ConnectPersonIndex.OnIndextListener() {@Overridepublic void onIndexWordListener(String w) {refreshWord(w);refreshName(w);}});}private void refreshName(String w) {for (int i = 0; i < persons.size(); i++) {String word = persons.get(i).getPinyin().substring(0, 1);if (word.equals(w)) {listview.setSelection(i);return;}}}private void refreshWord(String w) {word.setVisibility(View.VISIBLE);word.setText(w);mHandler.removeCallbacksAndMessages(null);mHandler.postDelayed(new Runnable() {@Overridepublic void run() {word.setVisibility(View.GONE);}}, 800);}class MyAdapter extends BaseAdapter {@Overridepublic int getCount() {return persons.size();}@Overridepublic Object getItem(int i) {return persons.get(i);}@Overridepublic long getItemId(int i) {return i;}@Overridepublic View getView(int i, View view, ViewGroup viewGroup) {ViewHolder holder = null;if (view == null) {view = View.inflate(MainActivity.this, R.layout.item_main, null);holder = new ViewHolder();holder.pinyin = (TextView) view.findViewById(R.id.pinyin);holder.name = (TextView) view.findViewById(R.id.name);view.setTag(holder);} else {holder = (ViewHolder) view.getTag();}String pinyin = persons.get(i).getPinyin().substring(0, 1);String name = persons.get(i).getName();Log.e("------------", "name: " + name + "pinyin" + pinyin);holder.pinyin.setText(pinyin);holder.name.setText(name);if (i == 0) {holder.pinyin.setVisibility(View.VISIBLE);} else {int prePosition = i - 1;String prePinYin = persons.get(prePosition).getPinyin().substring(0, 1);if (prePinYin.equals(pinyin)) {holder.pinyin.setVisibility(View.GONE);} else {holder.pinyin.setVisibility(View.VISIBLE);}}return view;}class ViewHolder {TextView pinyin;TextView name;}}
}

<?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"><TextViewandroid:id="@+id/pinyin"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="#22000000"android:paddingLeft="20dp"android:text="A"android:textColor="#000"android:textSize="18sp" /><TextViewandroid:id="@+id/name"android:layout_width="match_parent"android:layout_height="wrap_content"android:paddingLeft="20dp"android:text="人人网"android:textColor="#000"android:textSize="20sp" />
</LinearLayout>

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