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：
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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。
希望本文所述对大家android程序设计有所帮助。
如对本文有疑问， 点击进行留言回复！！
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