【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。
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。
