Android implementation of the imitation Address Book side sidebar sliding Siderbar effect code _android

This article describes the Android implementation of the imitation Address Book side sidebar sliding Siderbar effect code. Share to everyone for your reference, specific as follows:

See some of the application before the sidebar to do a good job, think of yourself to get a out, now share out, of course, there are deficiencies in the place, please forgive me.

First figure:

The code for the implementation is as follows:

Package com.freesonfish.listview_index; 
Import Android.content.Context; 
Import Android.graphics.Canvas; 
Import Android.graphics.Color; 
Import Android.graphics.Paint; 
Import Android.util.AttributeSet; 
Import android.view.MotionEvent; 
Import Android.view.View; 
  public class Mysidebar extends View {private Ontouchingletterchangedlistener touchlistener; 26 letters public static string[] B = {"#", "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 Boolean showbkg = false; 
  int choose =-1; 
  int scrollchoose =-1; 
  Paint Paint = new Paint (); 
  Paint rectpaint = new Paint (); 
  float rectwidth = 0f; 
    Public Mysidebar (context, AttributeSet attrs, int defstyle) {Super (context, attrs, Defstyle); 
  Init (); 
    Public Mysidebar (context, AttributeSet attrs) {Super (context, attrs); 
  Init (); 
   Public Mysidebar { Super (context); 
  Init (); 
    private void Init () {Rectpaint.setcolor (Color.parsecolor ("#CCCCCC")); 
  Rectwidth = Paint.measuretext ("#"); 
    /** * Rewrite this method * * protected void OnDraw (Canvas Canvas) {Super.ondraw (Canvas); 
    if (showbkg) {Canvas.drawcolor (Color.parsecolor ("#CCCCCC")); 
    Final int height = getheight (); 
    Final int width = getwidth (); 
    Final int singleheight = height/b.length; 
    Final float Xrectpos = ((float) width-paint.measuretext ("#"))/2.0f-rectwidth; 
    Final float XRectPos2 = xrectpos + 3.0f * rectwidth; 
      for (int i = 0; i < b.length; i++) {Paint.setfakeboldtext (true); 
      Paint.setantialias (TRUE);
      Final float xpos = ((float) width-paint.measuretext (b[i]))/2.0f; 
      Final float YPos = singleheight * i + singleheight; 
        if (i = = choose) {Paint.setcolor (color.red); Canvas.drawrect (Xrectpos, ypos-singleheight/2.0f, XRectPos2, YPos + rectWidth, Rectpaint); 
      } canvas.drawtext (B[i], xpos, YPos, paint); 
    Paint.reset (); 
    @Override public boolean dispatchtouchevent (Motionevent event) {Final int action = Event.getaction (); 
    Final float y = event.gety (); 
    Final int c = (int) (Y/getheight () * b.length); 
      Switch (action) {case MotionEvent.ACTION_DOWN:showBkg = true; 
      if (choose!= C && touchlistener!= null) {Doonactiondown (c); 
    } break; 
      Case MotionEvent.ACTION_MOVE:if (choose!= C && touchlistener!= null) {Doonactiondown (c); 
    } break; 
      Case MotionEvent.ACTION_UP:showBkg = false; 
      Invalidate (); 
    Break 
  return true; /** * ListView is called when rolling * * @param c/public void setcolorwhenlistviewscrolling (int c) {if ( 
      Scrollchoose!= c) {scrollchoose = C; 
    String string = ListContantsUtil.AbcList.get (c);  for (int i = c; i < B.length ++i) {if (String.Equals (B[i])) {choose = i; 
          Invalidate (); 
        Break }}/** * When the sidebar is pressed action * @param c */private void Doonactiondown (int c) {if (c &G T 0 && C < b.length) {if (ListContantsUtil.indexPositionMap.containsKey (B[c])) {TOUCHLISTENER.O 
        Ntouchingletterchanged (B[c]); 
        choose = C; 
      Invalidate (); 
        else {c = c-1; 
      Doonactiondown (c); 
  @Override public boolean ontouchevent (Motionevent event) {return super.ontouchevent (event); } public void Setontouchingletterchangedlistener (Ontouchingletterchangedlistener touchlistener) {This.touchListen 
  ER = Touchlistener; /** * is used to notify the activity that the selected letter * @author Freeson */public interface Ontouchingletterchangedlistener 
  {public void ontouchingletterchanged (String s);

 } 
}

Then the Listcontantsutil class is a class that stores the pinyin of the Address book name, as follows:

Package com.freesonfish.listview_index; 
Import java.util.ArrayList; 
Import Java.util.HashMap; 
Import java.util.List; 
  public class Listcontantsutil {static final list<integer> indexpositionlist = new arraylist<integer> (); 
  Static final list<string> abclist = new arraylist<string> (); 
  Static final hashmap<string, integer> indexpositionmap = new hashmap<string, integer> (); static void Putnameindextomap (List<string> List, hashmap<string, string> nameandpinyin) {int lenght = Li 
    St.size (); 
      for (int i = 0; I < lenght ++i) {String name = Nameandpinyin.get (List.get (i)). substring (0, 1); 
      Determines whether the character belongs to a letter or a number or another int ASCII = Name.tochararray () [0]; if (ASCII >= && ASCII <=) {if (!indexpositionmap.containskey (name)) {Indexpositi 
          Onmap.put (name, i); 
          Abclist.add (name); 
        Indexpositionlist.add (i); } else {if (!inDexpositionmap.containskey ("#")) {Indexpositionmap.put ("#", I); 
          Abclist.add ("#"); 
        Indexpositionlist.add (i);

 } 
      } 
    } 
  } 
}

Note that the above procedures are still some small problems, please pay attention to optimize the solution.

Full instance code code click here to download the site.

I hope this article will help you with the Android program.