Android Mobile Contact Quick Index (mobile newsletter) _android

Recently need to implement a mobile phone address Book fast indexing function. Fast indexing function based on first letter of name. Below is a mobile phone contact Quick Index effect, the overall code is not difficult, pinyin conversion place slightly complex. The following source code: The source code has comments.

Here is the effect chart:

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;
 /** * This is the main layout * @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) {//Hide 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); Sets the Listener Qiv_main.setonindexchangedlistener (new Quickindexview.onindexchangedlistener () {@Override public void Onin
    Dexchanged (String Word) {tv_main_word.settext (word);
    Tv_main_word.setvisibility (view.visible);
    Handler.removemessages (1);
    Remove the unhandled message handler.removecallbacksandmessages (NULL);
    Send Delay Message handler.sendemptymessagedelayed (1, 2000); Slide ListView//Find the corresponding 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);
  }
  });
  Display list adapter = new Friendadapter ();
  InitData ();
  Lv_main.setadapter (adapter);
 Lv_main.setselection (5);
  private void InitData () {Data.add (New Friend ("John"));
  Data.add (New Friend ("Yang Jiu")); Data.add (New Friend ("Hu Jiqun"));
  Data.add (New Friend ("Liu Chang"));
  Data.add (New Friend ("Zhong Zehing"));
  Data.add (New Friend ("Yin Innovation");
  Data.add (New Friend ("An"));
  Data.add (New Friend ("Zhangqian"));
  Data.add (New Friend ("Winson"));
  Data.add (New Friend ("Li Fengqiu"));
  Data.add (New Friend ("Liu Fu"));
  Data.add (New Friend ("Lou Quan Ultra"));
  Data.add (New Friend ("Zhang Meng"));
  Data.add (New Friend ("Wang Yingjie"));
  Data.add (New Friend ("Li Zhennan"));
  Data.add (New Friend ("Sun Ren"));
  Data.add (New Friend ("Tang Spring Thunder"));
  Data.add (New Friend ("Neu Pengwei"));
  Data.add (New Friend ("Ginger Aerospace"));
  Data.add (New Friend ("Liu Yan"));
  Data.add (New Friend ("Zhang Hongrui"));
  Data.add (New Friend ("Zhangjianzhong"));
  Data.add (New Friend ("Houya Handsome"));
  Data.add (New Friend ("Liu Shuai"));
  Data.add (New Friend ("Joe Flying"));
  Data.add (New Friend ("Xu Yujian"));
  Data.add (New Friend ("Wuliang"));
  Data.add (New Friend ("Wang Zhaolin"));
  Data.add (New Friend ("a third");
 Collections.sort (data);
  Class Friendadapter extends Baseadapter {@Override public int getcount () {return data.size (); @Override public Object getitem (int position) {returnData.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 ());
   The display if (position==0) {holder.wordTV.setVisibility (view.visible) with subscript 0;
    else {//Remove the last friend and get the first word String Preword = Data.get (position-1). Getpinyin (). substring (0, 1); Determines whether word is the same on the current line//If the same, hide if (word.equals (Preword)) {holder.wordTV.setVisibility (view.gone);
    else {//if different, show holder.wordTV.setVisibility (view.visible);
  } return Convertview;
   Class Viewholder {public TextView wordtv;
  Public TextView Nametv; }
 }
}

Master layout:

<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:layo ut_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 "Androi D: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:o" rientation= "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=" Someone " 
  android:textsize= "18SP"
  android:padding= "5DP"/>
</LinearLayout>

Custom 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;
 /** * This is a custom 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, 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) {//When the redraw is triggered each time, 26 letters are cycled over for (int i = 0; i < indexarr.length;
   i++) {String word = indexarr[i];
    Set the color of the text if (i = = Touchindex) {//Here set the changed letters to be clicked: The color turns gray, the font changes to 25SP paint.setcolor (Color.gray);
   Paint.settextsize (25);
    else {//other not clicked letters, keep the original status: Set the color, font size of 18sp paint.setcolor (Color.Black);
   Paint.settextsize (18);
   ///Get Word's wide-high Rect bounds = new Rect ();
   Paint.gettextbounds (Word, 0, word.length (), bounds);
   Get the wide int wordwidth = Bounds.width () of the font;
   Get the font of high int wordheight = Bounds.height ();
   Calculates the coordinates of Word's upper-left corner: The x coordinate of the letter, the y-coordinate float x = ITEMWIDTH/2-WORDWIDTH/2;
   Float y = itemheight/2 + wordheight/2 + i * itemheight;
  Draw Word Canvas.drawtext (Word, x, y, paint);
 }/////////////////////////////////////////////////////////////////////////private int touchindex = subscript for -1;//Touch letters @Override public BoOlean Ontouchevent (Motionevent event) {//Get events coordinates float Eventy = event.gety (); Switch (event.getaction ()) {case MotionEvent.ACTION_DOWN:case Motionevent.action_move://calculate subscript int index = (in
   T) (eventy/itemheight);
   if (Index >) {index = 25;
   } if (Index < 0) {index = 0;
    ///If subscript has changed, force redraw if (index!= touchindex) {//update touchindex touchindex = index;
    Force redraw invalidate (); Notifies the activity update TextView if (Onindexchangedlistener!= null) {onindexchangedlistener.onindexchanged (Indexarr[inde
    X]);
  }} break;
   Case MotionEvent.ACTION_UP:touchIndex =-1;
   Force redraw invalidate ();
   Notifies the activity update TextView if (Onindexchangedlistener!= null) {onindexchangedlistener.onup ();
  } break;
  Default:break;
 Return true;//All events are consumed by the current view} private Onindexchangedlistener Onindexchangedlistener; * * Set the method of listening object This method is typically an activity call/public void Setonindexchangedlistener (ONINDEXCHangedlistener onindexchangedlistener) {this.onindexchangedlistener = Onindexchangedlistener;
  Interface Onindexchangedlistener {////when the subscript for the operation changes, the public void onindexchanged (String word) is automatically invoked;
 Call public void Onup () when up; }
}

Contact Human:

/** *
 Contact Human
 * @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 ());
 }
}

Tool class: Used to convert Chinese characters to pinyin

/** * Converts Chinese characters to pinyin * @author LXD * */public class Pinyinutils {/** * to get the pinyin of the specified kanji * Note: should not be called frequently, it consumes a certain amount of memory * @param ha
  Nzi * @return/public static string Getpinyin (String hanzi) {string pinyin = ""; Hanyupinyinoutputformat format = new Hanyupinyinoutputformat ()//control whether the conversion is case or not, Shiying label Format.setcasetype (
  Hanyupinyincasetype.uppercase);//Capital Format.settonetype (Hanyupinyintonetype.without_tone);
  Since it cannot be directly converted to multiple Chinese characters, only a single Chinese character can be converted to char[] arr = Hanzi.tochararray (); for (int i = 0; i < arr.length i++) {if (Character.iswhitespace (arr[i)) continue;//If the space is not processed, the next traversal//Kanji is 2 bytes stored is definitely greater than 127, so greater than 127 can be converted to kanji if (arr[i]>127) {try {//due to the existence of pronunciation, Dan shan string[] Pinyinarr = Pinyinhelpe
     R.tohanyupinyinstringarray (Arr[i], format);
     if (pinyinarr!=null) {pinyin + = pinyinarr[0];
     }else {Pinyin + = arr[i];
     } catch (Badhanyupinyinoutputformatcombination e) {e.printstacktrace ();
    Not the correct kanji pinyin + = arr[i];
 }}else {   Not Chinese characters, pinyin + = arr[i];
 } return pinyin; }
}

The above code is about the Android phone Contact Quick index (mobile phone records) of the full description, I hope you like.