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仿美团实现地域选择(二)

介绍

上篇实现了PopupWindow选择地域,这篇介绍如何实现带有首字母的快速索引list,进行城市选择,我也是参考了相关博文才弄出来的,知道了原理,才发现如此简单。

其中有个开源项目可以参考,但与本文实现的方式略有不同。

地址:https://github.com/woozzu/IndexableListView

美团的城市选择看起来是这样的。本例中不包含搜索,有空再模仿研究下。

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原理

1、侧边快速索引和首字母直接在framelayout中布局的,也可以用代码动态生成。

2、获取拼音首字写用到了pinyin4j开源库,但是这样效率低下,可以考虑数据库字段冗余拼音等方式提高效率。

3、使用Comparator对获取首字母的列表进行了排序。

4、按下快速索引之后,使用Listview.setSelectionFromTop进行定位。

实现

activity_city_list.xml布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="match_parent"    android:background="#ffffff"    android:orientation="vertical" >    <FrameLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:background="#ffffff" >        <ListView            android:id="@+id/listView1"            android:layout_width="match_parent"            android:layout_height="wrap_content" >        </ListView>                <!-- 选中索引时,屏幕中间显示的大写字母 -->        <TextView            android:id="@+id/tv"            android:layout_width="60dp"            android:layout_height="60dp"            android:layout_gravity="center"            android:background="#aaffffff"            android:gravity="center"            android:text="A"            android:textColor="#aa000000"            android:textSize="30sp" />        <!-- 右侧快速索引列表 -->        <LinearLayout            android:id="@+id/layout"            android:layout_width="wrap_content"            android:layout_height="fill_parent"            android:layout_gravity="right"            android:layout_marginBottom="3dp"            android:layout_marginLeft="3dp"            android:layout_marginTop="3dp"            android:background="#d7d7d7"            android:gravity="center"            android:orientation="vertical" >        </LinearLayout>    </FrameLayout></LinearLayout>

item_city.xml布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical" >    <!-- 列表中的index首字母,之后第一个首字母下的item显示,其他隐藏 -->    <TextView        android:id="@+id/tv_index"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="#777777"        android:paddingBottom="2dp"        android:paddingLeft="10dp"        android:paddingTop="2dp"        android:text="index"        android:textColor="#ffffff" />    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        android:paddingBottom="10dp"        android:paddingLeft="10dp"        android:paddingTop="10dp" >        <TextView            android:id="@+id/tv1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="城市" />    </LinearLayout></LinearLayout>

CityListAdapter

/** * @author Leestar54  * http://www.cnblogs.com/leestar54 */package com.example.popupwindow;import java.util.HashMap;import java.util.List;import java.util.Map;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;public class CityListAdapter extends BaseAdapter {    private Context ctx;    private ViewHolder holder;    List<CityListItem> list;    Map<String, Integer> selector;// 键值是索引表的字母,值为对应在listview中的位置    String index[];//字母表    public CityListAdapter(Context context, List<CityListItem> list, String[] index) {        this.ctx = context;        this.list = list;        this.index = index;        selector = new HashMap<String, Integer>();        // 循环字母表,找出list中对应字母的位置        for (int j = 0; j < index.length; j++) {            for (int i = 0; i < list.size(); i++) {                // 由于已经按照字母排序过了,匹配中第一个就找下一个下标了。                if (list.get(i).getIndex().equals(index[j].toLowerCase())) {                    selector.put(index[j], i);                    break;                }            }        }    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return list.size();    }    @Override    public Object getItem(int arg0) {        // TODO Auto-generated method stub        return list.get(arg0);    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return 0;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        try {            if (convertView == null) {                holder = new ViewHolder();                convertView = LayoutInflater.from(ctx).inflate(R.layout.item_city, null);                holder.tv1 = (TextView) convertView.findViewById(R.id.tv1);                holder.index = (TextView) convertView.findViewById(R.id.tv_index);                convertView.setTag(holder);            } else {                holder = (ViewHolder) convertView.getTag();            }            // 绑定数据            CityListItem item = list.get(position);            holder.tv1.setText(item.getName());            // 显示index            String currentStr = item.getIndex();            // 上一项的index            String previewStr = (position - 1) >= 0 ? list.get(position - 1).getIndex() : " ";            //判断是否上一次的存在            if (!previewStr.equals(currentStr)) {                holder.index.setVisibility(View.VISIBLE);                holder.index.setText(currentStr);// 文本显示当前滑动的字母            } else {                holder.index.setVisibility(View.GONE);            }        } catch (OutOfMemoryError e) {            Runtime.getRuntime().gc();        } catch (Exception ex) {            ex.printStackTrace();        }        return convertView;    }    class ViewHolder {        TextView tv1;        TextView index;//索引字母    }    public Map<String, Integer> getSelector() {        return selector;    }    public void setSelector(Map<String, Integer> selector) {        this.selector = selector;    }    public String[] getIndex() {        return index;    }    public void setIndex(String[] index) {        this.index = index;    }}

 CitiesActivity

/** * @author Leestar54  * http://www.cnblogs.com/leestar54 */package com.example.popupwindow;import java.text.Collator;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;import android.graphics.Color;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.view.MenuItem;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.LinearLayout;import android.widget.LinearLayout.LayoutParams;import android.widget.ListView;import android.widget.TextView;public class CitiesActivity extends ActionBarActivity {    LinearLayout layoutIndex;    /** 字母索引表 */    private String[] str_index = { "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 int height;// 字体高度    private List<CityListItem> listData;    private ListView listView;    private CityListAdapter adapter;    private TextView tv_show;// 中间显示标题的文本    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        getSupportActionBar().setTitle("城市列表");        getSupportActionBar().setDisplayHomeAsUpEnabled(true);        getSupportActionBar().setHomeButtonEnabled(true);        setContentView(R.layout.activity_city_list);        layoutIndex = (LinearLayout) this.findViewById(R.id.layout);        layoutIndex.setBackgroundColor(Color.parseColor("#00ffffff"));        getData();        tv_show = (TextView) findViewById(R.id.tv);        tv_show.setVisibility(View.INVISIBLE);    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        switch (item.getItemId()) {        case android.R.id.home:            finish();            return true;        }        return false;    }    /**     * 获取城市列表     */    public void getData() {        CityListItem ci1=new CityListItem();        ci1.setName("北京");        CityListItem ci2=new CityListItem();        ci2.setName("上海");        CityListItem ci3=new CityListItem();        ci3.setName("广州");        CityListItem ci4=new CityListItem();        ci4.setName("广西");        CityListItem ci5=new CityListItem();        ci5.setName("长沙");        CityListItem ci6=new CityListItem();        ci6.setName("贵阳");        CityListItem ci7=new CityListItem();        ci7.setName("福建");                ArrayList<CityListItem> list=new ArrayList<CityListItem>();        list.add(ci1);        list.add(ci1);        list.add(ci1);        list.add(ci1);        list.add(ci1);        list.add(ci1);        list.add(ci2);list.add(ci2);list.add(ci2);list.add(ci2);list.add(ci2);list.add(ci2);        list.add(ci3);list.add(ci3);list.add(ci3);list.add(ci3);list.add(ci3);        list.add(ci4);list.add(ci4);list.add(ci4);list.add(ci4);list.add(ci4);        list.add(ci5);    list.add(ci5);    list.add(ci5);    list.add(ci5);        list.add(ci6);list.add(ci6);list.add(ci6);list.add(ci6);        list.add(ci7);list.add(ci7);list.add(ci7);list.add(ci7);                //获取首字母        for (CityListItem cityListItem : list) {            cityListItem.setIndex(String.valueOf(ChineseUtils.getHanyuPinyin(cityListItem.getName())                    .charAt(0)));        }        //排序        LetterComparator lc = new LetterComparator();        Collections.sort(list, lc);                listView = (ListView) findViewById(R.id.listView1);        adapter = new CityListAdapter(CitiesActivity.this, list, str_index);        listView.setAdapter(adapter);    }        @Override    public void onWindowFocusChanged(boolean hasFocus) {        // 在oncreate里面执行下面的代码没反应,因为oncreate里面得到的getHeight=0        // System.out.println("layoutIndex.getHeight()=" +        // layoutIndex.getHeight());        height = layoutIndex.getHeight() / str_index.length;        getIndexView();    }    /** 绘制索引列表 */    public void getIndexView() {        LinearLayout.LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, height);        // params.setMargins(10, 5, 10, 0);        for (int i = 0; i < str_index.length; i++) {            final TextView tv = new TextView(this);            tv.setLayoutParams(params);            tv.setText(str_index[i]);            tv.setPadding(10, 0, 10, 0);            layoutIndex.addView(tv);            layoutIndex.setOnTouchListener(new OnTouchListener() {                @Override                public boolean onTouch(View v, MotionEvent event)                {                    float y = event.getY();                    int index = (int) (y / height);                    if (index > -1 && index < str_index.length) {// 防止越界                        String key = str_index[index];                        if (adapter.getSelector().containsKey(key)) {                            // 获得位置                            int pos = adapter.getSelector().get(key);                            if (listView.getHeaderViewsCount() > 0) {// 防止ListView有标题栏,本例中没有。                                listView.setSelectionFromTop(pos + listView.getHeaderViewsCount(), 0);                            } else {                                listView.setSelectionFromTop(pos, 0);// 滑动到第一项                            }                            tv_show.setVisibility(View.VISIBLE);                            tv_show.setText(str_index[index]);                        }                    }                    switch (event.getAction()) {                    case MotionEvent.ACTION_DOWN:                        //按下颜色                        layoutIndex.setBackgroundColor(Color.parseColor("#aaffffff"));                        break;                    case MotionEvent.ACTION_MOVE:                        break;                    case MotionEvent.ACTION_UP:                        //释放还原                        layoutIndex.setBackgroundColor(Color.parseColor("#00ffffff"));                        tv_show.setVisibility(View.INVISIBLE);                        break;                    }                    return true;                }            });        }    }    private class LetterComparator implements Comparator<CityListItem> {        @Override        public int compare(CityListItem lhs, CityListItem rhs) {            return Collator.getInstance().compare(lhs.getIndex(), rhs.getIndex());        }    }}

 

最后看起来应该是这样的

技术分享

demo地址:

 链接:http://pan.baidu.com/s/1o6keEKE 密码:ssbn

 

 大多都是参考别人的,还有许多地方不完善呢,慢慢来吧。

参考:

http://blog.csdn.net/pathuang68/article/details/6692882

http://www.cnblogs.com/Jaylong/archive/2013/04/13/android_view.html

http://blog.csdn.net/wwj_748/article/details/17305195

http://blog.csdn.net/xiaanming/article/details/12684155

仿美团实现地域选择(二)