Xamarin.Forms has been studying for a long time, and has been learning recently. I want to try calling other SDK, such as Tencent Map SDK (application is easy).

Thank you for the following links to complete this project:

http://www.cnblogs.com/jtang/p/4698496.html

 

Reference to other documents:

Tencent Map SDK (Android) Document There are detailed usage procedures (of course, the code is not applicable to C #, but to download SDK from here, there are also procedures for how to apply for Key, please refer to read)

Xamarin.Forms Customizes Control Documents for Each Platform How to call other pages according to different platform conditions

Xamarin.Android binds Java library documents This is the process of converting SDK Jar packages of other software into C DLL, which is available only after conversion (see IOS and Windows, of course, but the blogger's mobile phone is Android, which is convenient for debugging).

 

With everything in place, Tencent Map began to be called.

 

1. Create a Cross-Platform project (Xamarin.Forms template, PCL project) blogger is Xamarin_Setup 2.3.0.XXX (updated on the evening of 2017-2-23) version, if developed with VS2017, it is also the creation interface, if VS2015, and updated the latest version of Xamarin, is also the new creation interface, the next interface continues to choose PCL or SAP; if VS2015 and Xamarn Version 2.2.X.XXX shows all the options in the first interface. Just select Xamarin Forms Xaml (Portable Class Labrary).

 

2. After creating the project, Mr. Cheng runs it once and suggests debugging it directly with mobile phone (yes, blogger uses Red Rice 3). If this can not be debugged and run successfully, it is recommended that you configure your environment first, otherwise you can not do the following.

 

3. Right-click the solution and create a new project to convert the jar of Tencent Map into DLL.

 

4. After the creation is completed, the libs folder in the SDK downloaded from Tencent's official website contains corresponding. jar files, which are added to the Jars folder, and the generation of jar files is changed to Embedded Jar.

 

5. Right-click on the TencentMapDemo. Android JavaBinding project, click Generation, and find some errors and warnings (how many warnings do not matter, does not affect the call)

 

6. Clicking on the first error will go to Com. Tencent... MapController. cs. In fact, the error is obvious, it contains the same function name, the use of the call does not know which function to call. As for why this is, there is no in-depth study, I hope God can answer it. Okay, let's just delete all the methods of this class and leave an empty class.

 

7. Right-click on the TencentMapDemo. Android Java Binding project, click Generation, and after successful generation, generate a DLL in the file directory of the current project / bin/debug /, which is the library we want to call.

 

8. Right-click on the Android project and add the DLL to the reference.

 

9. Right-click on Android, open the property, and check the following permissions in the Android list.

 

 

10. In the Android project, create a class: TencentMapRenderer.cs. The code reference is as follows. Note the comments.

 

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 
  6 using Android.App;
  7 using Android.Content;
  8 using Android.OS;
  9 using Android.Runtime;
 10 using Android.Views;
 11 using Android.Widget;
 12 using Xamarin.Forms.Platform.Android;
 13 using Xamarin.Forms;
 14 using TencentMapDemo;
 15 using TencentMapDemo.Droid;
 16 using Com.Tencent.Tencentmap.Mapsdk.Map;
 17 using Com.Tencent.Mapsdk.Raster.Model;
 18 
 19 //ExportRenderer Add properties to the custom renderer class to specify that it will be used for rendering Xamarin.Forms Custom maps. This property is used to Xamarin.Forms Register a custom renderer. The first is the interface to be loaded, and the second is the interface to be referenced.
 20 [assembly: ExportRenderer(typeof(MainPage), typeof(TencentMapRenderer))]
 21 namespace TencentMapDemo.Droid
 22 {
 23     public class TencentMapRenderer : PageRenderer
 24     {
 25         /// <summary>
 26         /// Tencent Map View
 27         /// </summary>
 28         private MapView mapView;
 29 
 30         /// <summary>
 31         /// layout
 32         /// </summary>
 33         private LinearLayout layout;
 34 
 35         protected override void OnElementChanged(ElementChangedEventArgs<Page> e)
 36         {
 37             base.OnElementChanged(e);
 38 
 39             if (e.NewElement == null || e.OldElement != null)
 40             {
 41                 return;
 42             }
 43 
 44             //e.NewElement It's the loading interface. Here it is. PCL Inside the project MainPage
 45             var mainPage = e.NewElement as MainPage;
 46 
 47             //Initialization mapView
 48             mapView = new MapView(this.Context);
 49             mapView.OnCreate(null);
 50 
 51             //Initialization view
 52             layout = new LinearLayout(this.Context);
 53             layout.AddView(mapView);
 54             this.AddView(layout);
 55 
 56             //Here's a comparison between our writing and Tencent's official website Java The difference in writing can be seen. Java The attributes inside are set,get The prefix is C#It's hidden inside. It's used directly. C#The usual attribute writing is replaced by the same method. SetXXX(),GetXXX()，however Java yes camelCasing，C#use PascalCasing Writing (bloggers like it very much) C#Writing, and hate Java writing: -). These differences are all conversion rules that bind Java libraries in Xamarin. 
 57 
 58             #region TencentMap class
 59             //Tencent Map is set up through TencentMap Class settings, you can control the map type, display range, zoom level, add / delete marker And graphics, in addition to various callback monitors for maps are also bound to TencentMap. Below is TencentMap Class usage example:
 60 
 61             //Obtain TencentMap Example
 62             TencentMap tencentMap = mapView.Map;
 63             //Setting Real-time Road Opening
 64             tencentMap.TrafficEnabled = true;
 65             //Setting up Map Center Point
 66             tencentMap.SetCenter(new Com.Tencent.Mapsdk.Raster.Model.LatLng(22.500980, 113.057899));
 67             //Setting Scale Level
 68             tencentMap.SetZoom(11);
 69             #endregion
 70 
 71             #region UiSettings class
 72             //UiSettings Class is used to set the view state of a map, such as Logo Position setting, scale position setting, map gesture switch, etc. Below is UiSettings Class usage example:
 73 
 74             //Obtain UiSettings Example
 75             UiSettings uiSettings = mapView.UiSettings;
 76             //Set up logo To the bottom center of the screen
 77             uiSettings.SetLogoPosition(UiSettings.LogoPositionCenterBottom);
 78             //Set the scale to the lower right corner of the screen
 79             uiSettings.SetScaleViewPosition(UiSettings.ScaleviewPositionRightBottom);
 80             //Enable zoom gesture(For more gesture control, please refer to the development manual.)
 81             uiSettings.SetZoomGesturesEnabled(true);
 82             #endregion
 83 
 84             #region Use marker
 85             //Attention, here we go. resources/drawable/Add a red_location.png Pictures
 86             var bitmap = Resources.GetBitmap("red_location.png");
 87             BitmapDescriptor des = new BitmapDescriptor(bitmap);
 88             foreach (var item in mainPage.Options)
 89             {
 90                 MarkerOptions options = new MarkerOptions();
 91                 
 92                 options.InvokeIcon(des);
 93                 options.InvokeTitle(item.Title);
 94                 options.Anchor(0.5f, 0.5f);
 95                 options.InvokePosition(new LatLng(item.Lat, item.Lng));
 96                 options.Draggable(true);
 97                 Marker marker = mapView.AddMarker(options);
 98                 marker.ShowInfoWindow();
 99             }
100 
101             #endregion
102 
103         }
104 
105         protected override void OnLayout(bool changed, int l, int t, int r, int b)
106         {
107             base.OnLayout(changed, l, t, r, b);
108             var msw = Android.Views.View.MeasureSpec.MakeMeasureSpec(r - l, MeasureSpecMode.Exactly);
109             var msh = Android.Views.View.MeasureSpec.MakeMeasureSpec(b - t, MeasureSpecMode.Exactly);
110             layout.Measure(msw, msh);
111             layout.Layout(0, 0, r - l, b - t);
112         }
113     }
114 }

 

11. In the Andriod project, double-click on Android Manifest. XML in Properties and add the Key to Tencent's application in <application><application> (if not, a warning text appears on the map)

<meta-data android:name="TencentMapSDK" android:value="You applied for it. Key"/>

 

 

12. In the PCL project, modify App.xaml, code as follows:

 1         public App()
 2         {
 3             InitializeComponent();
 4 
 5             var options = new List<Option>(){
 6                 new Option() { Title="xinhui district",Lat=22.458680,Lng=113.032400},
 7                 new Option() { Title="Pengjiang District",Lat=22.594994,Lng=113.071976},
 8                 new Option() {Title="jianghai district",Lat=22.549977,Lng=113.117981 }
 9             };
10 
11 
12             MainPage = new NavigationPage(new MainPage() { Options = options });
13         }

 

 

13. In the PCL project, modify MainPage.xaml, code as follows:

1 <?xml version="1.0" encoding="utf-8" ?>
2 <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
3              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
4              xmlns:local="clr-namespace:TencentMapDemo"
5              x:Class="TencentMapDemo.MainPage"
6              Title="Tencent Map Call Demo">
7     <!--Here the default Label delete-->
8 </ContentPage>

 

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using Xamarin.Forms;
 7 
 8 namespace TencentMapDemo
 9 {
10     public partial class MainPage : ContentPage
11     {
12         public IEnumerable<Option> Options;
13 
14         public MainPage()
15         {
16             InitializeComponent();
17         }   
18     }
19 
20     /// <summary>
21     /// Tag class
22     /// </summary>
23     public class Option
24     {
25         /// <summary>
26         /// Title
27         /// </summary>
28         public string Title { get; set; }
29 
30         /// <summary>
31         /// latitude
32         /// </summary>
33         public double Lat { get; set; }
34 
35         /// <summary>
36         /// longitude
37         /// </summary>
38         public double Lng { get; set; }
39 
40     }
41 }

 

　

14. Finally generate and debug, the effect is as follows:

 

If you have any questions, you can shoot bricks (although bloggers rarely log in to check messages), it's better to contact my QQ: 492683562