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, -);
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(, strPt.IndexOf(","));
string lng = strPt.Substring(strPt.IndexOf(",") + );
pt = new LatLng(double.Parse(lat), double.Parse(lng));
info.InvokePt(pt);
if (FavoriteManager.Instance.Add(info) == )
{
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 == )
{
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 = ; 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 = ; 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。