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。
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
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