【Android】3.14 公交线路查询功能

分类：C#、Android、VS2015、百度地图应用； 创建日期：2016-02-04

一、简介

利用BusLineSearch方法可查询公交线路的详情信息。

二、运行截图

简介：介绍查询公交线路功能

（1）点击“开始”按钮可查询公交线路；

（2）搜索出公交线路后点击“下一条”按钮可查询该线路的反方向公交线路；

本示例运行截图如下：

三、设计步骤

1、添加demo14_busLine.xml文件

在layout文件夹下添加该文件，然后将代码改为下面的内容：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="在" />

        <EditText
            android:id="@+id/city"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="北京" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="市内找" />

        <EditText
            android:id="@+id/searchkey"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="717" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="公交车" />

        <LinearLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/search"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dip"
                android:layout_marginRight="2dip"
                android:layout_weight="1"
                android:background="@drawable/button_style"
                android:text="开始" />

            <Button
                android:id="@+id/nextline"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="2dip"
                android:layout_marginRight="2dip"
                android:layout_weight="1"
                android:background="@drawable/button_style"
                android:text="下一条" />
        </LinearLayout>
    </LinearLayout>

    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <fragment
            android:id="@+id/bmapView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            class="com.baidu.mapapi.map.TextureMapFragment"
            android:clickable="true" />

        <LinearLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignWithParentIfMissing="false"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="false"
            android:layout_marginBottom="10dip" >

            <Button
                android:id="@+id/pre"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_marginLeft="2dip"
                android:layout_marginRight="2dip"
                android:layout_weight="1.0"
                android:background="@drawable/pre_" />

            <Button
                android:id="@+id/next"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_marginLeft="2dip"
                android:layout_marginRight="2dip"
                android:layout_weight="1.0"
                android:background="@drawable/next_" />
        </LinearLayout>
    </RelativeLayout>

</LinearLayout>

2、添加Demo14BusLine.cs文件

在SrcSdkDemos文件夹下添加该文件，然后将代码改为下面的内容：

using Android.App;
using Android.Content.PM;
using Android.OS;
using Android.Views;
using Android.Widget;
using Android.Support.V4.App;
using Com.Baidu.Mapapi.Map;
using Com.Baidu.Mapapi.Model;
using Com.Baidu.Mapapi.Search.Busline;
using Com.Baidu.Mapapi.Search.Core;
using Com.Baidu.Mapapi.Search.Poi;
using System.Collections.Generic;
using BdMapV371Demos.SrcOverlayUtil;

namespace BdMapV371Demos.SrcSdkDemos
{
    /// <summary>
    /// 此demo用来展示如何进行公交线路详情检索，并使用RouteOverlay在地图上绘制 同时展示如何浏览路线节点并弹出泡泡
    /// </summary>
    [Activity(Label = "@string/demo_name_bus",
        ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.KeyboardHidden,
        ScreenOrientation = ScreenOrientation.Sensor)]
    public class Demo14BusLineSearch : FragmentActivity,
        IOnGetPoiSearchResultListener,
        IOnGetBusLineSearchResultListener,
        BaiduMap.IOnMapClickListener
    {
        private Button mBtnPre = null;// 上一个节点
        private Button mBtnNext = null;// 下一个节点
        private int nodeIndex = -2;// 节点索引,供浏览节点时使用
        private BusLineResult route = null;// 保存驾车/步行路线数据的变量，供浏览节点时使用
        private IList<string> busLineIDList = null;
        private int busLineIndex = 0;

        // 搜索相关
        private PoiSearch mSearch = null; // 搜索模块，也可去掉地图模块独立使用
        private BusLineSearch mBusLineSearch = null;

        private BaiduMap mBaiduMap = null;
        BusLineOverlay overlay;//公交路线绘制对象

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.demo14_busline);

            mBtnPre = FindViewById<Button>(Resource.Id.pre);
            mBtnPre.Click += delegate { NodeClick(Resource.Id.pre); };

            mBtnNext = FindViewById<Button>(Resource.Id.next);
            mBtnPre.Click += delegate { NodeClick(Resource.Id.next); };

            mBtnPre.Visibility = ViewStates.Invisible;
            mBtnNext.Visibility = ViewStates.Invisible;
            mBaiduMap = FragmentManager.FindFragmentById<TextureMapFragment>(Resource.Id.bmapView).BaiduMap;
            mBaiduMap.SetOnMapClickListener(this);

            mSearch = PoiSearch.NewInstance();
            mSearch.SetOnGetPoiSearchResultListener(this);

            mBusLineSearch = BusLineSearch.NewInstance();
            mBusLineSearch.SetOnGetBusLineSearchResultListener(this);

            busLineIDList = new List<string>();
            overlay = new BusLineOverlay(mBaiduMap);
            mBaiduMap.SetOnMarkerClickListener(overlay);

            //【开始】按钮
            var btnSearch = FindViewById<Button>(Resource.Id.search);
            btnSearch.Click += delegate
            {
                busLineIDList.Clear();
                busLineIndex = 0;
                mBtnPre.Visibility = ViewStates.Invisible;
                mBtnNext.Visibility = ViewStates.Invisible;
                EditText editCity = FindViewById<EditText>(Resource.Id.city);
                EditText editSearchKey = FindViewById<EditText>(Resource.Id.searchkey);
                //// 发起poi检索，从得到所有poi中找到公交线路类型的poi，再使用该poi的uid进行公交详情搜索
                mSearch.SearchInCity(new PoiCitySearchOption()
                    .City(editCity.Text).Keyword(editSearchKey.Text));
            };

            //【下一条】按钮
            var btnNextline = FindViewById<Button>(Resource.Id.nextline);
            btnNextline.Click += delegate
            {
                SearchNextBusline();
            };
        }

        private void SearchNextBusline()
        {
            if (busLineIndex >= busLineIDList.Count)
            {
                busLineIndex = 0;
            }
            if (busLineIndex >= 0 && busLineIndex < busLineIDList.Count
                    && busLineIDList.Count > 0)
            {
                mBusLineSearch.SearchBusLine(new BusLineSearchOption()
                    .City(FindViewById<EditText>(Resource.Id.city).Text)
                    .Uid(busLineIDList[busLineIndex]));
                busLineIndex++;
            }
        }

        /// <summary>
        /// 节点浏览示例
        /// </summary>
        /// <param name="id">按钮的id</param>
        public void NodeClick(int id)
        {
            if (nodeIndex < -1 || route == null
                    || nodeIndex >= route.Stations.Count)
                return;

            TextView popupText = new TextView(this);
            popupText.SetBackgroundResource(Resource.Drawable.popup);
            popupText.SetTextColor(Android.Graphics.Color.Black);

            // 上一个节点
            if (id == Resource.Id.pre && nodeIndex > 0)
            {
                // 索引减
                nodeIndex--;
            }
            // 下一个节点
            if (id == Resource.Id.next && nodeIndex < (route.Stations.Count - 1))
            {
                // 索引加
                nodeIndex++;
            }
            if (nodeIndex >= 0)
            {
                // 移动到指定索引的坐标
                mBaiduMap.SetMapStatus(MapStatusUpdateFactory.NewLatLng(
                    route.Stations[nodeIndex].Location));
                // 弹出泡泡
                popupText.Text = route.Stations[nodeIndex].Title;
                mBaiduMap.ShowInfoWindow(new InfoWindow(popupText,
                    route.Stations[nodeIndex].Location, 0));
            }
        }

        protected override void OnPause()
        {
            base.OnPause();
        }

        protected override void OnResume()
        {
            base.OnResume();
        }

        protected override void OnDestroy()
        {
            mSearch.Destroy();
            mBusLineSearch.Destroy();
            base.OnDestroy();
        }

        public void OnGetBusLineResult(BusLineResult result)
        {
            if (result == null || result.Error != SearchResult.ERRORNO.NoError)
            {
                Toast.MakeText(this, "抱歉，未找到结果", ToastLength.Long).Show();
                return;
            }
            mBaiduMap.Clear();
            route = result;
            nodeIndex = -1;
            overlay.RemoveFromMap();
            overlay.SetData(result);
            overlay.AddToMap();
            overlay.ZoomToSpan();
            mBtnPre.Visibility = ViewStates.Visible;
            mBtnNext.Visibility = ViewStates.Visible;
            Toast.MakeText(this, result.BusLineName, ToastLength.Short).Show();
        }

        public void OnGetPoiResult(PoiResult result)
        {
            if (result == null || result.Error != SearchResult.ERRORNO.NoError)
            {
                Toast.MakeText(this, "抱歉，未找到结果", ToastLength.Long).Show();
                return;
            }
            // 遍历所有poi，找到类型为公交线路的poi
            busLineIDList.Clear();
            foreach (PoiInfo poi in result.AllPoi)
            {
                if (poi.Type == PoiInfo.POITYPE.BusLine
                        || poi.Type == PoiInfo.POITYPE.SubwayLine)
                {
                    busLineIDList.Add(poi.Uid);
                }
            }
            SearchNextBusline();
            route = null;
        }

        public void OnGetPoiDetailResult(PoiDetailResult result)
        {

        }

        public void OnMapClick(LatLng point)
        {
            mBaiduMap.HideInfoWindow();
        }

        public bool OnMapPoiClick(MapPoi poi)
        {
            return false;
        }
    }
}

3、修改MainActivity.cs

在MainActivity.cs文件的demos字段定义中，去掉【示例14】下面的注释。

运行观察结果。