100字范文 > Android 仿美团网探索ListView的A-Z字母排序功能实现选择城市

Android 仿美团网探索ListView的A-Z字母排序功能实现选择城市

时间：2021-04-14 18:49:10

记得在我刚开始接触到美团网的时候就对美团网这个城市定位、选择城市功能很感兴趣，觉得它做得很棒。有如下几个点：

一：实现ListView的A-Z字母排序功能

二：根据输入框的输入值改变来过滤搜索结果，如果输入框里面的值为空，更新为原来的列表，否则为过滤数据列表

三：汉字转成拼音的功能，很多时候实现联系人或者城市列表等实现A-Z的排序功能，我们可以直接从数据库中获取他的汉字拼音，而对于一般的数据，我们怎么实现A-Z的排序，这里我使用了PinYin4j.jar将汉字转换为拼音.

按照惯例先来看一下最终效果图：

接下来分析下整个功能模块的布局结构：

（1）首先一个带删除按钮的EditText，我们在输入框中输入我们查找的城市可以自动过滤出最终的结果，当输入框中没有数据自动替换到原来的数据列表；

（2）中间是当前定位的城市和热门的城市，其中热门城市使用到了GridView；

（3）下面是一个ListView用来显示数据列表，右侧是一个字母索引表，当我们点击不同的字母,ListView会定位到该字母地方

现在我们来看下项目结构图

按照项目中类的顺序来一一介绍

1.PinYin4j.jar用于将汉字转换为拼音，你还可以使用其他方式将汉子转换为拼音，我之前有介绍过，这里就不详讲啦，探索PinYin4j.jar将汉字转换为拼音的基本用法

2.CitySortModel一个实体类，一个显示的城市和相对应的拼音首字母

package com.adan.selectcitydome.view;public class CitySortModel {private String name;//显示的数据private String sortLetters;//显示数据拼音的首字母public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSortLetters() {return sortLetters;}public void setSortLetters(String sortLetters) {this.sortLetters = sortLetters;}}

3.EditTextWithDel类是自定义的一个带清除功能的输入框控件,也可以用Android原生的EditText，这个类上一篇博客有介绍，这里就不贴上代码了Android 带清除功能的输入框控件EditTextWithDel

4.MyGridView类就是自定义GridView，主要是解决了在热门城市中嵌套Grideview的显示不完全的问题

package com.adan.selectcitydome.view;import android.content.Context;import android.util.AttributeSet;import android.widget.GridView;/*** 自定义GridView，解决嵌套Grideview的显示不完全的问题*/public class MyGridView extends GridView {public MyGridView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}public MyGridView(Context context, AttributeSet attrs) {super(context, attrs);}public MyGridView(Context context) {super(context);}/*** 其中onMeasure函数决定了组件显示的高度与宽度；* makeMeasureSpec函数中第一个函数决定布局空间的大小，第二个参数是布局模式* MeasureSpec.AT_MOST的意思就是子控件需要多大的控件就扩展到多大的空间*/@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,MeasureSpec.AT_MOST);super.onMeasure(widthMeasureSpec, expandSpec);}}

5.PinyinComparator类用来对ListView中的数据根据A-Z进行排序，前面两个if判断主要是将不是以汉字开头的数据放在后面

package com.adan.selectcitydome.view;import parator;/*** 用来对ListView中的数据根据A-Z进行排序，前面两个if判断主要是将不是以汉字开头的数据放在后面*/public class PinyinComparator implements Comparator<CitySortModel> {public int compare(CitySortModel o1, CitySortModel o2) {//这里主要是用来对ListView里面的数据根据ABCDEFG...来排序if (o1.getSortLetters().equals("@")|| o2.getSortLetters().equals("#")) {return -1;} else if (o1.getSortLetters().equals("#")|| o2.getSortLetters().equals("@")) {return 1;} else {return o1.getSortLetters().compareTo(o2.getSortLetters());}}}

6.PinyinUtils类，就是第一点所讲的PinYin4j.jar用于将汉字转换为拼音啦，这里就不粘贴代码啦

7.SideBar类就是ListView右侧的字母索引View，我们需要使用setTextView(TextView mTextDialog)来设置用来显示当前按下的字母的TextView,以及使用setOnTouchingLetterChangedListener方法来设置回调接口，在回调方法onTouchingLetterChanged(String s)中来处理不同的操作

package com.adan.selectcitydome.view;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.TextView;import com.adan.selectcitydome.R;import java.util.ArrayList;import java.util.Arrays;import java.util.List;/*** ListView右侧的字母索引View*/public class SideBar extends View {public static String[] INDEX_STRING = {"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 OnTouchingLetterChangedListener onTouchingLetterChangedListener;private List<String> letterList;private int choose = -1;private Paint paint = new Paint();private TextView mTextDialog;public SideBar(Context context) {this(context, null);}public SideBar(Context context, AttributeSet attrs) {this(context, attrs, 0);}public SideBar(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);init();}private void init() {setBackgroundColor(Color.parseColor("#F0F0F0"));letterList = Arrays.asList(INDEX_STRING);}protected void onDraw(Canvas canvas) {super.onDraw(canvas);int height = getHeight();// 获取对应高度int width = getWidth();// 获取对应宽度int singleHeight = height / letterList.size();// 获取每一个字母的高度for (int i = 0; i < letterList.size(); i++) {paint.setColor(Color.parseColor("#606060"));paint.setTypeface(Typeface.DEFAULT_BOLD);paint.setAntiAlias(true);paint.setTextSize(20);// 选中的状态if (i == choose) {paint.setColor(Color.parseColor("#4F41FD"));paint.setFakeBoldText(true);}// x坐标等于中间-字符串宽度的一半.float xPos = width / 2 - paint.measureText(letterList.get(i)) / 2;float yPos = singleHeight * i + singleHeight / 2;canvas.drawText(letterList.get(i), xPos, yPos, paint);paint.reset();// 重置画笔}}@Overridepublic boolean dispatchTouchEvent(MotionEvent event) {final int action = event.getAction();final float y = event.getY();// 点击y坐标final int oldChoose = choose;final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;final int c = (int) (y / getHeight() * letterList.size());// 点击y坐标所占总高度的比例*b数组的长度就等于点击b中的个数.switch (action) {case MotionEvent.ACTION_UP:setBackgroundColor(Color.parseColor("#F0F0F0"));choose = -1;invalidate();if (mTextDialog != null) {mTextDialog.setVisibility(View.GONE);}break;default:setBackgroundResource(R.drawable.sidebar_background);if (oldChoose != c) {if (c >= 0 && c < letterList.size()) {if (listener != null) {listener.onTouchingLetterChanged(letterList.get(c));}if (mTextDialog != null) {mTextDialog.setText(letterList.get(c));mTextDialog.setVisibility(View.VISIBLE);}choose = c;invalidate();}}break;}return true;}public void setIndexText(ArrayList<String> indexStrings) {this.letterList = indexStrings;invalidate();}/*** 为SideBar设置显示当前按下的字母的TextView** @param mTextDialog*/public void setTextView(TextView mTextDialog) {this.mTextDialog = mTextDialog;}/*** 向外公开的方法** @param onTouchingLetterChangedListener*/public void setOnTouchingLetterChangedListener(OnTouchingLetterChangedListener onTouchingLetterChangedListener) {this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;}/*** 接口*/public interface OnTouchingLetterChangedListener {void onTouchingLetterChanged(String s);}}

8.CityAdapter就是热门城市中GridView的适配器

9.SortAdapter 数据的适配器类，这里我们需要用到的就是SectionIndexer接口，它能够有效地帮助我们对分组进行控制。使用SectionIndexer接口需要实现三个方法：getSectionForPosition(int position)，getPositionForSection(int section)，getSections()，我们只需要自行实现前面两个方法：

（一）getSectionForPosition(int position)是根据ListView的position来找出当前位置所在的分组

getPositionForSection(int section)就是根据首字母的Char值来获取在该ListView中第一次出现该首字母的位置,也就是当前分组所在的位置

package com.adan.selectcitydome;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.SectionIndexer;import android.widget.TextView;import com.adan.selectcitydome.view.CitySortModel;import java.util.List;public class SortAdapter extends BaseAdapter implements SectionIndexer {private List<CitySortModel> list = null;private Context mContext;public SortAdapter(Context mContext, List<CitySortModel> list) {this.mContext = mContext;this.list = list;}/*** 当ListView数据发生变化时,调用此方法来更新ListView** @param list*/public void updateListView(List<CitySortModel> list) {this.list = list;notifyDataSetChanged();}public int getCount() {return this.list.size();}public Object getItem(int position) {return list.get(position);}public long getItemId(int position) {return position;}public View getView(final int position, View view, ViewGroup arg2) {ViewHolder viewHolder = null;final CitySortModel mContent = list.get(position);if (view == null) {viewHolder = new ViewHolder();view = LayoutInflater.from(mContext).inflate(R.layout.item_select_city, null);viewHolder.tvTitle = (TextView) view.findViewById(R.id.tv_city_name);view.setTag(viewHolder);viewHolder.tvLetter = (TextView) view.findViewById(R.id.tv_catagory);} else {viewHolder = (ViewHolder) view.getTag();}int section = getSectionForPosition(position);if (position == getPositionForSection(section)) {viewHolder.tvLetter.setVisibility(View.VISIBLE);viewHolder.tvLetter.setText(mContent.getSortLetters());} else {viewHolder.tvLetter.setVisibility(View.GONE);}viewHolder.tvTitle.setText(this.list.get(position).getName());return view;}final static class ViewHolder {TextView tvLetter;TextView tvTitle;}public int getSectionForPosition(int position) {return list.get(position).getSortLetters().charAt(0);}public int getPositionForSection(int section) {for (int i = 0; i < getCount(); i++) {String sortStr = list.get(i).getSortLetters();char firstChar = sortStr.toUpperCase().charAt(0);if (firstChar == section) {return i;}}return -1;}@Overridepublic Object[] getSections() {return null;}}

10.MainActivity 对EditTextWithDel设置addTextChangedListener监听，当输入框内容发生变化根据里面的值过滤ListView，里面的值为空显示原来的列表和给ListView添加表头等

package com.adan.selectcitydome;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.text.TextUtils;import android.text.TextWatcher;import android.view.View;import android.widget.AdapterView;import android.widget.GridView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import com.adan.selectcitydome.view.CitySortModel;import com.adan.selectcitydome.view.EditTextWithDel;import com.adan.selectcitydome.view.PinyinComparator;import com.adan.selectcitydome.view.PinyinUtils;import com.adan.selectcitydome.view.SideBar;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class MainActivity extends Activity {private ListView sortListView;private SideBar sideBar;private TextView dialog, mTvTitle;private SortAdapter adapter;private EditTextWithDel mEtCityName;private List<CitySortModel> SourceDateList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initViews();}private void initViews() {mEtCityName = (EditTextWithDel) findViewById(R.id.et_search);sideBar = (SideBar) findViewById(R.id.sidrbar);dialog = (TextView) findViewById(R.id.dialog);mTvTitle = (TextView) findViewById(R.id.tv_title);sortListView = (ListView) findViewById(R.id.country_lvcountry);initDatas();initEvents();setAdapter();}private void setAdapter() {SourceDateList = filledData(getResources().getStringArray(R.array.provinces));Collections.sort(SourceDateList, new PinyinComparator());adapter = new SortAdapter(this, SourceDateList);sortListView.addHeaderView(initHeadView());sortListView.setAdapter(adapter);}private void initEvents() {//设置右侧触摸监听sideBar.setOnTouchingLetterChangedListener(new SideBar.OnTouchingLetterChangedListener() {@Overridepublic void onTouchingLetterChanged(String s) {//该字母首次出现的位置int position = adapter.getPositionForSection(s.charAt(0));if (position != -1) {sortListView.setSelection(position + 1);}}});//ListView的点击事件sortListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {mTvTitle.setText(((CitySortModel) adapter.getItem(position - 1)).getName());Toast.makeText(getApplication(), ((CitySortModel) adapter.getItem(position)).getName(), Toast.LENGTH_SHORT).show();}});//根据输入框输入值的改变来过滤搜索mEtCityName.addTextChangedListener(new TextWatcher() {@Overridepublic void beforeTextChanged(CharSequence s, int start, int count, int after) {}@Overridepublic void onTextChanged(CharSequence s, int start, int before, int count) {//当输入框里面的值为空，更新为原来的列表，否则为过滤数据列表filterData(s.toString());}@Overridepublic void afterTextChanged(Editable s) {}});}private void initDatas() {sideBar.setTextView(dialog);}private View initHeadView() {View headView = getLayoutInflater().inflate(R.layout.headview, null);GridView mGvCity = (GridView) headView.findViewById(R.id.gv_hot_city);String[] datas = getResources().getStringArray(R.array.city);ArrayList<String> cityList = new ArrayList<>();for (int i = 0; i < datas.length; i++) {cityList.add(datas[i]);}CityAdapter adapter = new CityAdapter(getApplicationContext(), R.layout.gridview_item, cityList);mGvCity.setAdapter(adapter);return headView;}/*** 根据输入框中的值来过滤数据并更新ListView** @param filterStr*/private void filterData(String filterStr) {List<CitySortModel> mSortList = new ArrayList<>();if (TextUtils.isEmpty(filterStr)) {mSortList = SourceDateList;} else {mSortList.clear();for (CitySortModel sortModel : SourceDateList) {String name = sortModel.getName();if (name.toUpperCase().indexOf(filterStr.toString().toUpperCase()) != -1 || PinyinUtils.getPingYin(name).toUpperCase().startsWith(filterStr.toString().toUpperCase())) {mSortList.add(sortModel);}}}// 根据a-z进行排序Collections.sort(mSortList, new PinyinComparator());adapter.updateListView(mSortList);}private List<CitySortModel> filledData(String[] date) {List<CitySortModel> mSortList = new ArrayList<>();ArrayList<String> indexString = new ArrayList<>();for (int i = 0; i < date.length; i++) {CitySortModel sortModel = new CitySortModel();sortModel.setName(date[i]);String pinyin = PinyinUtils.getPingYin(date[i]);String sortString = pinyin.substring(0, 1).toUpperCase();if (sortString.matches("[A-Z]")) {sortModel.setSortLetters(sortString.toUpperCase());if (!indexString.contains(sortString)) {indexString.add(sortString);}}mSortList.add(sortModel);}Collections.sort(indexString);sideBar.setIndexText(indexString);return mSortList;}}

布局文件就不贴出来了，有兴趣的可以下载代码，有什么疑问的，请在下面留言，感谢各位^_^

本项目改造自/xiaanming/article/details/12684155

源代码请戳这里：Android 仿美团网,探索ListView的A-Z字母排序功能实现选择省份或者城市

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