最近需要實現一個手機通訊錄的快速索引功能。根據姓名首字母快速索引功能。下面是一個手機聯系人快速索引的效果，總體來說代碼不算難，拼音轉換的地方略有復雜。下面上源碼：源碼中有注釋。
下面是效果圖：
MainActivity：
import java.util.ArrayList;import java.util.Collections;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;/** * 這里是主布局 * @author lxd * */public class MainActivity extends Activity { private ListView lv_main; private FriendAdapter adapter; private List<Friend> data = new ArrayList<Friend>(); private QuickIndexView qiv_main; private TextView tv_main_word; private Handler handler = new Handler(){ public void handleMessage(android.os.Message msg) { //隱藏word tv_main_word.setVisibility(View.GONE); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv_main = (ListView) findViewById(R.id.lv_main); qiv_main = (QuickIndexView) findViewById(R.id.qiv_main); tv_main_word = (TextView) findViewById(R.id.tv_main_word); //設置監聽 qiv_main.setOnIndexChangedListener(new QuickIndexView.OnIndexChangedListener() { @Override public void onIndexChanged(String word) { tv_main_word.setText(word); tv_main_word.setVisibility(View.VISIBLE); //handler.removeMessages(1); //移除未處理的消息 handler.removeCallbacksAndMessages(null); //發延遲消息 handler.sendEmptyMessageDelayed(1, 2000); //滑動listview //查找對應的item for(int i=0;i<data.size();i++) { String fWord = data.get(i).getPinyin().substring(0, 1); if(word.equals(fWord)) { lv_main.setSelection(i); return; } } } @Override public void onUp() { //tv_main_word.setVisibility(View.GONE); } }); //顯示列表 adapter = new FriendAdapter(); initData(); lv_main.setAdapter(adapter); //lv_main.setSelection(5); } private void initData() { data.add(new Friend("張三")); data.add(new Friend("楊九")); data.add(new Friend("胡繼群")); data.add(new Friend("劉暢")); data.add(new Friend("鐘澤興")); data.add(new Friend("尹革新")); data.add(new Friend("安傳鑫")); data.add(new Friend("張騫壬")); data.add(new Friend("溫松")); data.add(new Friend("李鳳秋")); data.add(new Friend("劉甫")); data.add(new Friend("婁全超")); data.add(new Friend("張猛")); data.add(new Friend("王英杰")); data.add(new Friend("李振南")); data.add(new Friend("孫仁政")); data.add(new Friend("唐春雷")); data.add(new Friend("牛鵬偉")); data.add(new Friend("姜宇航")); data.add(new Friend("劉挺")); data.add(new Friend("張洪瑞")); data.add(new Friend("張建忠")); data.add(new Friend("侯亞帥")); data.add(new Friend("劉帥")); data.add(new Friend("喬競飛")); data.add(new Friend("徐雨健")); data.add(new Friend("吳亮")); data.add(new Friend("王兆霖")); data.add(new Friend("阿三")); Collections.sort(data); } class FriendAdapter extends BaseAdapter { @Override public int getCount() { return data.size(); } @Override public Object getItem(int position) { return data.get(position); } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder = null; if(convertView==null) { holder = new ViewHolder(); convertView = View.inflate(MainActivity.this, R.layout.item_main, null); holder.wordTV = (TextView) convertView.findViewById(R.id.tv_item_word); holder.nameTV = (TextView) convertView.findViewById(R.id.tv_item_name); convertView.setTag(holder);//***********? } else { holder = (ViewHolder) convertView.getTag(); } Friend friend = data.get(position); String word = friend.getPinyin().substring(0, 1); holder.wordTV.setText(word); holder.nameTV.setText(friend.getName()); //下標為0的顯示 if(position==0) { holder.wordTV.setVisibility(View.VISIBLE); } else { //取出上一個friend, 并得到的第一個word String preWord = data.get(position-1).getPinyin().substring(0, 1); //判斷是否于當前行的word是否相同 //如果相同, 隱藏 if(word.equals(preWord)) { holder.wordTV.setVisibility(View.GONE); } else { //如果不同, 顯示 holder.wordTV.setVisibility(View.VISIBLE); } } return convertView; } class ViewHolder { public TextView wordTV; public TextView nameTV; } }}主布局：
<RelativeLayout 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" tools:context="${relativePackage}.${activityClass}" > <ListView android:id="@+id/lv_main" android:layout_width="match_parent" android:layout_height="match_parent" > </ListView> <!-- com.atguigu.quickindex.QuickIndexView --> <com.atguigu.quickindex.QuickIndexView android:id="@+id/qiv_main" android:layout_width="40dp" android:layout_height="match_parent" android:layout_alignParentRight="true" android:background="#ffffff" > </com.atguigu.quickindex.QuickIndexView> <TextView android:id="@+id/tv_main_word" android:layout_width="100dp" android:layout_height="100dp" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:background="#66666666" android:text="A" android:textSize="40sp" android:gravity="center" android:visibility="gone"/></RelativeLayout>Item：
<?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="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/tv_item_word" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="A" android:background="#66666666" android:textSize="18sp" android:padding="5dp"/> <TextView android:id="@+id/tv_item_name" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="某人" android:textSize="18sp" android:padding="5dp"/></LinearLayout>
自定義View：
import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * 這里是自定義View * @author lxd * */public class QuickIndexView extends View { private float itemWidth; private float itemHeight; // private float wordWidth; // private float wordHeight; private String[] indexArr = { "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; public QuickIndexView(Context context, AttributeSet attrs) { super(context, attrs); paint = new Paint(); paint.setColor(Color.WHITE); paint.setTextSize(16); paint.setAntiAlias(true); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); itemWidth = this.getMeasuredWidth(); itemHeight = this.getMeasuredHeight() / 26f; } @Override protected void onDraw(Canvas canvas) { //當每次觸發重繪的時候，就把26個字母循環一遍 for (int i = 0; i < indexArr.length; i++) { String word = indexArr[i]; // 設置文字的顏色 if (i == touchIndex) { //這里設置被點擊的字母變化：顏色變灰色、字體變25sp paint.setColor(Color.GRAY); paint.setTextSize(25); } else { //其他沒被點擊的字母，保持原有狀態：設置顏色、字體大小為18sp paint.setColor(Color.BLACK); paint.setTextSize(18); } // 得到word的寬高 Rect bounds = new Rect(); paint.getTextBounds(word, 0, word.length(), bounds); //得到字體的寬 int wordWidth = bounds.width(); //得到字體的高 int wordHeight = bounds.height(); // 計算word的左上角的坐標：字母所在的X坐標、Y坐標 float x = itemWidth / 2 - wordWidth / 2; float y = itemHeight / 2 + wordHeight / 2 + i * itemHeight; // 繪制word canvas.drawText(word, x, y, paint); } } // /////////////////////////////////////////////////////////////////////// private int touchIndex = -1;// 觸摸的字母的下標 @Override public boolean onTouchEvent(MotionEvent event) { // 得到事件坐標 float eventY = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_MOVE: // 計算下標 int index = (int) (eventY / itemHeight); if (index > 25) { index = 25; } if (index < 0) { index = 0; } // 如果下標有改變, 強制重繪 if (index != touchIndex) { // 更新touchIndex touchIndex = index; // 強制重繪 invalidate(); // 通知Activity更新TextView if (onIndexChangedListener != null) { onIndexChangedListener.onIndexChanged(indexArr[index]); } } break; case MotionEvent.ACTION_UP: touchIndex = -1; // 強制重繪 invalidate(); // 通知Activity更新TextView if (onIndexChangedListener != null) { onIndexChangedListener.onUp(); } break; default: break; } return true;// 所有的事件都由當前視圖消費 } private OnIndexChangedListener onIndexChangedListener; /* * 設置監聽對象的方法 這個方法一般是Activity調用 */ public void setOnIndexChangedListener( OnIndexChangedListener onIndexChangedListener) { this.onIndexChangedListener = onIndexChangedListener; } interface OnIndexChangedListener { // 當操作的下標改變時自動調用 public void onIndexChanged(String word); // 當up時調用 public void onUp(); }}聯系人類：
/** * 聯系人類 * @author lxd * */public class Friend implements Comparable<Friend> { private String name; private String pinyin; public Friend(String name) { super(); this.name = name; 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; } @Override public String toString() { return "Friend [name=" + name + ", pinyin=" + pinyin + "]"; } @Override public int compareTo(Friend another) { return this.pinyin.compareTo(another.getPinyin()); }}工具類：用于將漢字轉換為拼音
/** * 將漢字轉換為拼音 * @author lxd * */public class PinYinUtils { /** * 得到指定漢字的拼音 * 注意:不應該被頻繁調用，它消耗一定內存 * @param hanzi * @return */ public static String getPinYin(String hanzi){ String pinyin = ""; HanyuPinyinOutputFormat format = new HanyuPinyinOutputFormat();//控制轉換是否大小寫，是否帶音標 format.setCaseType(HanyuPinyinCaseType.UPPERCASE);//大寫 format.setToneType(HanyuPinyinToneType.WITHOUT_TONE); //由于不能直接對多個漢字轉換，只能對單個漢字轉換 char[] arr = hanzi.toCharArray(); for (int i = 0; i < arr.length; i++) { if(Character.isWhitespace(arr[i]))continue;//如果是空格，則不處理，進行下次遍歷 //漢字是2個字節存儲，肯定大于127，所以大于127就可以當為漢字轉換 if(arr[i]>127){ try { //由于多音字的存在，單 dan shan String[] pinyinArr = PinyinHelper.toHanyuPinyinStringArray(arr[i], format); if(pinyinArr!=null){ pinyin += pinyinArr[0]; }else { pinyin += arr[i]; } } catch (BadHanyuPinyinOutputFormatCombination e) { e.printStackTrace(); //不是正確的漢字 pinyin += arr[i]; } }else { //不是漢字， pinyin += arr[i]; } } return pinyin; }}以上代碼是關于Android手機聯系人快速索引(手機通訊錄)的全部敘述，希望大家喜歡。
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