Android实现仿通讯录侧边栏滑动SiderBar效果代码

本文实例讲述了android实现仿通讯录侧边栏滑动siderbar效果代码。分享给大家供大家参考，具体如下：

之前看到某些应用的侧边栏做得不错，想想自己也弄一个出来，现在分享出来，当然里面还有不足的地方，请大家多多包涵。

先上图：

具体实现的代码如下：

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个字母 
  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 context, attributeset attrs, int defstyle) { 
    super(context, attrs, defstyle); 
    init(); 
  } 
  public mysidebar(context context, attributeset attrs) { 
    super(context, attrs); 
    init(); 
  } 
  public mysidebar(context context) { 
    super(context); 
    init(); 
  } 
  private void init() { 
    rectpaint.setcolor(color.parsecolor("#cccccc")); 
    rectwidth = paint.measuretext("#"); 
  } 
  /** 
   * 重写这个方法 
   */ 
  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滚动时候调用它 
   * 
   * @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; 
        } 
      } 
    } 
  } 
  /** 
   * 当侧边栏被按下的动作 
   * @param c 
   */ 
  private void doonactiondown(int c) { 
    if (c > 0 && c < b.length) { 
      if (listcontantsutil.indexpositionmap.containskey(b[c])) { 
        touchlistener.ontouchingletterchanged(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.touchlistener = touchlistener; 
  } 
  /** 
   * 用来通知activity显示选中的字母 
   * @author freeson 
   * 
   */ 
  public interface ontouchingletterchangedlistener { 
    public void ontouchingletterchanged(string s); 
  } 
}

然后listcontantsutil类是存储通讯录名字的拼音等的类，具体也如下：

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 = list.size(); 
    for (int i = 0; i < lenght; ++i) { 
      string name = nameandpinyin.get(list.get(i)).substring(0, 1); 
      // 判断该字符是属于字母还是数字或其他的 
      int ascii = name.tochararray()[0]; 
      if (ascii >= 65 && ascii <= 90) { 
        if (!indexpositionmap.containskey(name)) { 
          indexpositionmap.put(name, i); 
          abclist.add(name); 
          indexpositionlist.add(i); 
        } 
      } else { 
        if (!indexpositionmap.containskey("#")) { 
          indexpositionmap.put("#", i); 
          abclist.add("#"); 
          indexpositionlist.add(i); 
        } 
      } 
    } 
  } 
}

注意，上面的程序还是有些小问题的，请大家注意优化解决。

完整实例代码代码点击此处本站下载。

希望本文所述对大家android程序设计有所帮助。