• 【Android】3.21 示例21—兴趣点收藏功能


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

    简介:介绍如何创建、管理本地收藏的兴趣点数据

    详述:

    (1)新建本地点收藏;

    (2)查看已收藏本地点;

    (3)删除已收藏本地点;

    一、运行截图

    长按选择的兴趣点,就会自动显示该点的经纬度,输入名称,单击【保存】按钮就保存了该兴趣点。可多次重复此过程保存多个兴趣点。

    单击【查看全部】按钮,就会显示如下图所示的兴趣点标注。单击标注,会弹出对话框编辑或删除该标注。

    单击【删除全部】,将删除所有兴趣点。

    image

    二、设计步骤

    1、添加xml文件

    在layout文件夹下添加下面的3个文件(代码不再列出):

    demo21_favorite.xml

    demo21_favorite_alert.xml

    demo21_favorite_infowindow.xml

    2、添加Demo21Favorite.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 Com.Baidu.Mapapi.Favorite;
    using Com.Baidu.Mapapi.Map;
    using Com.Baidu.Mapapi.Model;
    using System.Collections.Generic;
    
    namespace BdMapV371Demos.SrcSdkDemos
    {
        /// <summary>
        /// 演示如何使用本地点收藏功能
        /// </summary>
        [Activity(Label = "@string/demo_name_favorite",
            ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.KeyboardHidden,
            ScreenOrientation = ScreenOrientation.Sensor)]
        public class Demo21Favorite : Activity
        {
            //地图相关
            private TextureMapView mMapView;
            private BaiduMap mBaiduMap;
    
            //界面控件相关
            private EditText locationText;
            private EditText nameText;
            private View mPop;
            private View mModify;
            EditText mdifyName;
            //保存点中的点id
            private string currentID;
            //显示marker用的图标
            BitmapDescriptor bdA = BitmapDescriptorFactory.FromResource(Resource.Drawable.icon_marka);
            IList<Marker> markers = new List<Marker>();
            protected override void OnCreate(Bundle savedInstanceState)
            {
                base.OnCreate(savedInstanceState);
                SetContentView(Resource.Layout.demo21_favorite);
                //初始化地图
                mMapView = FindViewById<TextureMapView>(Resource.Id.bmapView);
                mBaiduMap = mMapView.Map;
                mBaiduMap.MapClick += (s, e) =>
                {
                    mBaiduMap.HideInfoWindow();
                };
                mBaiduMap.MapLongClick += (s, e) =>
                {
                    var point = e.P0;
                    locationText.Text = string.Format("{0},{1}", point.Latitude, point.Longitude);
                };
                mBaiduMap.MarkerClick += (s, e) =>
                {
                    var marker = e.P0;
                    mBaiduMap.HideInfoWindow();
                    if (marker == null)
                    {
                        return;
                    }
                    else
                    {
                        InfoWindow mInfoWindow = new InfoWindow(mPop, marker.Position, -47);
                        mBaiduMap.ShowInfoWindow(mInfoWindow);
                        MapStatusUpdate update = MapStatusUpdateFactory.NewLatLng(marker.Position);
                        mBaiduMap.SetMapStatus(update);
                        currentID = marker.ExtraInfo.GetString("id");
                    }
                };
    
                //【保存】按钮--添加收藏点
                Button btnSave = FindViewById<Button>(Resource.Id.save);
                btnSave.Click += delegate
                {
                    if (string.IsNullOrEmpty(nameText.Text))
                    {
                        Toast.MakeText(this, "名称必填", ToastLength.Long).Show();
                        return;
                    }
                    if (string.IsNullOrEmpty(locationText.Text))
                    {
                        Toast.MakeText(this, "坐标点必填", ToastLength.Long).Show();
                        return;
                    }
                    FavoritePoiInfo info = new FavoritePoiInfo();
                    info.InvokePoiName(nameText.Text);
    
                    LatLng pt;
                    try
                    {
                        string strPt = locationText.Text;
                        string lat = strPt.Substring(0, strPt.IndexOf(","));
                        string lng = strPt.Substring(strPt.IndexOf(",") + 1);
                        pt = new LatLng(double.Parse(lat), double.Parse(lng));
                        info.InvokePt(pt);
                        if (FavoriteManager.Instance.Add(info) == 1)
                        {
                            Toast.MakeText(this, "添加成功", ToastLength.Long).Show();
                        }
                        else
                        {
                            Toast.MakeText(this, "添加失败", ToastLength.Long).Show();
                        }
                    }
                    catch
                    {
                        Toast.MakeText(this, "坐标解析错误", ToastLength.Long).Show();
                    }
                };
    
                //【查看全部】按钮--获取全部收藏点
                Button btnSearchAll = FindViewById<Button>(Resource.Id.searchall);
                btnSearchAll.Click += delegate
                {
                    mBaiduMap.Clear();
                    IList<FavoritePoiInfo> list = FavoriteManager.Instance.AllFavPois;
                    if (list == null || list.Count == 0)
                    {
                        Toast.MakeText(this, "没有收藏点", ToastLength.Long).Show();
                        return;
                    }
                    //将marker绘制在地图上
                    markers.Clear();
                    for (int i = 0; i < list.Count; i++)
                    {
                        MarkerOptions option = new MarkerOptions()
                        .InvokeIcon(bdA)
                        .InvokePosition(list[i].Pt);
                        Bundle b = new Bundle();
                        b.PutString("id", list[i].ID);
                        option.InvokeExtraInfo(b);
                        markers.Add((Marker)mBaiduMap.AddOverlay(option));
                    }
                };
    
                //【删除全部】按钮--删除全部点
                Button btnDeleteAll = FindViewById<Button>(Resource.Id.deleteall);
                btnDeleteAll.Click += delegate
                {
                    if (FavoriteManager.Instance.ClearAllFavPois())
                    {
                        Toast.MakeText(this, "全部删除成功", ToastLength.Long).Show();
                        mBaiduMap.Clear();
                        mBaiduMap.HideInfoWindow();
                    }
                    else
                    {
                        Toast.MakeText(this, "全部删除失败", ToastLength.Long).Show();
                    }
                };
    
                //初始化收藏夹
                FavoriteManager.Instance.Init();
                //初始化UI
                InitUI();
            }
            public void InitUI()
            {
                locationText = FindViewById<EditText>(Resource.Id.pt);
                nameText = FindViewById<EditText>(Resource.Id.name);
    
                //获取弹框
                mPop = LayoutInflater.Inflate(Resource.Layout.demo21_favorite_infowindow, null, false);
                //弹框中的【修改】按钮--修改收藏点
                Button btnSearchOne = mPop.FindViewById<Button>(Resource.Id.searchone);
                btnSearchOne.Click += delegate
                {
                    mBaiduMap.HideInfoWindow();
                    //弹框修改
                    mModify = LayoutInflater.Inflate(Resource.Layout.demo21_favorite_alert, null);
                    mdifyName = mModify.FindViewById<EditText>(Resource.Id.modifyedittext);
                    AlertDialog.Builder builder = new AlertDialog.Builder(this);
                    builder.SetView(mModify);
                    string oldName = FavoriteManager.Instance.GetFavPoi(currentID).PoiName;
                    mdifyName.Text = oldName;
                    builder.SetPositiveButton("确认", (sender, args) =>
                     {
                         string newName = mdifyName.Text;
                         if (string.IsNullOrEmpty(newName) == false)
                         {
                             //modify
                             FavoritePoiInfo info = FavoriteManager.Instance.GetFavPoi(currentID);
                             info.InvokePoiName(newName);
                             if (FavoriteManager.Instance.UpdateFavPoi(currentID, info))
                             {
                                 Toast.MakeText(this, "修改成功", ToastLength.Long).Show();
                             }
                         }
                         else
                         {
                             Toast.MakeText(this, "名称不能为空,修改失败", ToastLength.Long).Show();
                         }
                         (sender as AlertDialog).Dismiss();
                     });
                    builder.SetNegativeButton("取消", (sender, args) =>
                    {
                        (sender as AlertDialog).Dismiss();
                    });
                    builder.Create().Show();
                };
                //弹框中的【删除】按钮--删除一个指定点
                Button btnDeleteOne = mPop.FindViewById<Button>(Resource.Id.deleteone);
                btnDeleteOne.Click += delegate
                {
                    if (FavoriteManager.Instance.DeleteFavPoi(currentID))
                    {
                        Toast.MakeText(this, "删除点成功", ToastLength.Long).Show();
                        if (markers != null)
                        {
                            for (int i = 0; i < markers.Count; i++)
                            {
                                if (markers[i].ExtraInfo.GetString("id") == currentID)
                                {
                                    markers[i].Remove();
                                    markers.RemoveAt(i);
                                    mBaiduMap.HideInfoWindow();
                                    break;
                                }
                            }
                        }
                    }
                    else
                    {
                        Toast.MakeText(this, "删除点失败", ToastLength.Long).Show();
                    }
                };
            }
    
            protected override void OnPause()
            {
                mMapView.OnPause();
                base.OnPause();
            }
    
            protected override void OnResume()
            {
                mMapView.OnResume();
                base.OnResume();
            }
    
            protected override void OnDestroy()
            {
                //释放收藏夹功能资源
                FavoriteManager.Instance.Destroy();
                bdA.Recycle();
                // MapView的生命周期与Activity同步,当activity销毁时需调用MapView.destroy()
                mMapView.OnDestroy();
                mBaiduMap = null;
                base.OnDestroy();
            }
        }
    }

    3、修改MainActivity.cs文件

    在MainActivity.cs文件的demos字段定义中,去掉【示例21】下面的注释。

    运行观察效果。

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  • 原文地址:https://www.cnblogs.com/rainmj/p/5181830.html
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