Android仿微信（二）——仿微信联系人 首字母分类

效果图

代码：http://download.csdn.net/detail/b275518834/5753931

实现这个效果，需要三个知识点 ：

1：将字符串 进行拼音分类

2：ExpandableListView 二级扩展列表

3：右边字母分类View

4：中间的绿色对话框popupWindow

首先字母分类代码 获得字符串首字母 首字符

[java]view
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//获得字符串的首字母 首字符 转汉语拼音

public String getFirstChar(String value) {

// 首字符

char firstChar = value.charAt(0);

// 首字母分类

String first = null;

// 是否是非汉字

String[] print = PinyinHelper.toHanyuPinyinStringArray(firstChar);

if (print == null) {

// 将小写字母改成大写

if ((firstChar >= 97 && firstChar <= 122)) {

firstChar -= 32;

}

if (firstChar >= 65 && firstChar <= 90) {

first = String.valueOf((char) firstChar);

} else {

// 认为首字符为数字或者特殊字符

first = "#";

}

} else {

// 如果是中文 分类大写字母

first = String.valueOf((char)(print[0].charAt(0) -32));

}

if (first == null) {

first = "?";

}

return first;

}

汉字排序

[java]view
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/**

* 汉字排序

* */

public class LanguageComparator_CN implements Comparator<String> {

public int compare(String ostr1, String ostr2) {

for (int i = 0; i < ostr1.length() && i < ostr2.length(); i++) {

int codePoint1 = ostr1.charAt(i);

int codePoint2 = ostr2.charAt(i);

if (Character.isSupplementaryCodePoint(codePoint1)

|| Character.isSupplementaryCodePoint(codePoint2)) {

i++;

}

if (codePoint1 != codePoint2) {

if (Character.isSupplementaryCodePoint(codePoint1)

|| Character.isSupplementaryCodePoint(codePoint2)) {

return codePoint1 - codePoint2;

}

String pinyin1 = pinyin((char) codePoint1);

String pinyin2 = pinyin((char) codePoint2);

if (pinyin1 != null && pinyin2 != null) { // 两个字符都是汉字

if (!pinyin1.equals(pinyin2)) {

return pinyin1.compareTo(pinyin2);

}

} else {

return codePoint1 - codePoint2;

}

}

}

return ostr1.length() - ostr2.length();

}

// 获得汉字拼音的首字符

private String pinyin(char c) {

String[] pinyins = PinyinHelper.toHanyuPinyinStringArray(c);

if (pinyins == null) {

return null;

}

return pinyins[0];

}

}

2级列表展开

[java]view
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//展开所有

or (int i = 0, length = adapter.getGroupCount(); i < length; i++) {

eListView.expandGroup(i);

2级列表adapter

[java]view
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package com.cn.demo.pinyin;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

import org.pingyin.LanguageComparator_CN;

import net.sourceforge.pinyin4j.PinyinHelper;

import android.content.Context;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView.LayoutParams;

import android.widget.BaseExpandableListAdapter;

import android.widget.TextView;

import android.widget.Toast;

public class PinyinAdapter extends BaseExpandableListAdapter {

// 字符串

private List<String> strList;

private AssortPinyinList assort = new AssortPinyinList();

private Context context;

private LayoutInflater inflater;

// 中文排序

private LanguageComparator_CN cnSort = new LanguageComparator_CN();

public PinyinAdapter(Context context, List<String> strList) {

super();

this.context = context;

this.inflater = LayoutInflater.from(context);

this.strList = strList;

if (strList == null) {

strList = new ArrayList<String>();

}

long time = System.currentTimeMillis();

// 排序

sort();

Toast.makeText(context,

String.valueOf(System.currentTimeMillis() - time), 1).show();

}

private void sort() {

// 分类

for (String str : strList) {

assort.getHashList().add(str);

}

assort.getHashList().sortKeyComparator(cnSort);

for(int i=0,length=assort.getHashList().size();i<length;i++)

{

Collections.sort((assort.getHashList().getValueListIndex(i)),cnSort);

}

}

public Object getChild(int group, int child) {

// TODO Auto-generated method stub

return assort.getHashList().getValueIndex(group, child);

}

public long getChildId(int group, int child) {

// TODO Auto-generated method stub

return child;

}

public View getChildView(int group, int child, boolean arg2,

View contentView, ViewGroup arg4) {

// TODO Auto-generated method stub

if (contentView == null) {

contentView = inflater.inflate(R.layout.adapter_chat, null);

}

TextView textView = (TextView) contentView.findViewById(R.id.name);

textView.setText(assort.getHashList().getValueIndex(group, child));

return contentView;

}

public int getChildrenCount(int group) {

// TODO Auto-generated method stub

return assort.getHashList().getValueListIndex(group).size();

}

public Object getGroup(int group) {

// TODO Auto-generated method stub

return assort.getHashList().getValueListIndex(group);

}

public int getGroupCount() {

// TODO Auto-generated method stub

return assort.getHashList().size();

}

public long getGroupId(int group) {

// TODO Auto-generated method stub

return group;

}

public View getGroupView(int group, boolean arg1, View contentView,

ViewGroup arg3) {

if (contentView == null) {

contentView = inflater.inflate(R.layout.list_group_item, null);

contentView.setClickable(true);

}

TextView textView = (TextView) contentView.findViewById(R.id.name);

textView.setText(assort.getFirstChar(assort.getHashList()

.getValueIndex(group, 0)));

// 禁止伸展

return contentView;

}

public boolean hasStableIds() {

// TODO Auto-generated method stub

return true;

}

public boolean isChildSelectable(int arg0, int arg1) {

// TODO Auto-generated method stub

return true;

}

public AssortPinyinList getAssort() {

return assort;

}

}

右边字母View编写

[java]view
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package com.cn.demo.pinyin;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Typeface;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.widget.Button;

public class AssortView extends Button {

public interface OnTouchAssortListener {

public void onTouchAssortListener(String s);

public void onTouchAssortUP();

}

public AssortView(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

public AssortView(Context context, AttributeSet attrs) {

super(context, attrs);

// TODO Auto-generated constructor stub

}

public AssortView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

// TODO Auto-generated constructor stub

}

// 分类

private String[] assort = { "?", "#", "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 = new Paint();

// 选择的索引

private int selectIndex = -1;

// 字母监听器

private OnTouchAssortListener onTouch;

public void setOnTouchAssortListener(OnTouchAssortListener onTouch) {

this.onTouch = onTouch;

}

@Override

protected void onDraw(Canvas canvas) {

// TODO Auto-generated method stub

super.onDraw(canvas);

int height = getHeight();

int width = getWidth();

int interval = height / assort.length;

for (int i = 0, length = assort.length; i < length; i++) {

// 抗锯齿

paint.setAntiAlias(true);

// 默认粗体

paint.setTypeface(Typeface.DEFAULT_BOLD);

// 白色

paint.setColor(Color.WHITE);

if (i == selectIndex) {

// 被选择的字母改变颜色和粗体

paint.setColor(Color.parseColor("#3399ff"));

paint.setFakeBoldText(true);

paint.setTextSize(30);

}

// 计算字母的X坐标

float xPos = width / 2 - paint.measureText(assort[i]) / 2;

// 计算字母的Y坐标

float yPos = interval * i + interval;

canvas.drawText(assort[i], xPos, yPos, paint);

paint.reset();

}

}

@Override

public boolean dispatchTouchEvent(MotionEvent event) {

// TODO Auto-generated method stub

float y = event.getY();

int index = (int) (y / getHeight() * assort.length);

if (index >= 0 && index < assort.length) {

switch (event.getAction()) {

case MotionEvent.ACTION_MOVE:

// 如果滑动改变

if (selectIndex != index) {

selectIndex = index;

if (onTouch != null) {

onTouch.onTouchAssortListener(assort[selectIndex]);

}

}

break;

case MotionEvent.ACTION_DOWN:

selectIndex = index;

if (onTouch != null) {

onTouch.onTouchAssortListener(assort[selectIndex]);

}

break;

case MotionEvent.ACTION_UP:

if (onTouch != null) {

onTouch.onTouchAssortUP();

}

selectIndex = -1;

break;

}

} else {

selectIndex = -1;

if (onTouch != null) {

onTouch.onTouchAssortUP();

}

}

invalidate();

return true;

}

@Override

public boolean onTouchEvent(MotionEvent event) {

return super.onTouchEvent(event);

}

}

中间绿色的对话框

[java]view
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//字母按键回调

assortView.setOnTouchAssortListener(new OnTouchAssortListener() {

View layoutView=LayoutInflater.from(MainActivity.this)

.inflate(R.layout.alert_dialog_menu_layout, null);

TextView text =(TextView) layoutView.findViewById(R.id.content);

PopupWindow popupWindow ;

public void onTouchAssortListener(String str) {

int index=adapter.getAssort().getHashList().indexOfKey(str);

if(index!=-1)

{

eListView.setSelectedGroup(index);;

}

if(popupWindow!=null){

text.setText(str);

}

else

{

popupWindow = new PopupWindow(layoutView,

80, 80,

false);

// 显示在Activity的根视图中心

popupWindow.showAtLocation(getWindow().getDecorView(),

Gravity.CENTER, 0, 0);

}

text.setText(str);

}

public void onTouchAssortUP() {

if(popupWindow!=null)

popupWindow.dismiss();

popupWindow=null;

}

});