我试图在Xamarin for Android中使用谷歌地图API，到目前为止它一直是一个吸引人的经历。我是Xamarin的新手并试图掌握它。我测试了一些基本的控件，它们似乎工作正常。现在我正在尝试使用Google Map Api。我已根据Xamarin文档在AndroidManifest.xml中插入了Api密钥。我在Main.axml文件中有以下代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
</LinearLayout>
这是我的活动课
[Activity (Label = "Testing", MainLauncher = true)]
public class MainActivity : Android.GoogleMaps.MapActivity
{
protected override bool IsRouteDisplayed {
get {
return false;
}
}
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
SetContentView (Resource.Layout.Main);
// Get our button from the layout resource,
// and attach an event to it
//Button button = FindViewById<Button> (Resource.Id.myButton);
//button.Click += delegate {
// button.Text = string.Format ("{0} clicks!", count++);
//};
}
}
当我运行上面的代码时，它会抛出异常
Android.Views.InflateException: Loading
我没有像在VS中通常那样得到错误的任何细节。我不知道出了什么问题我现在只是盲目地关注文档，在屏幕上看到一些东西然后玩它但是我猜不会发生这种情况！
我针对此测试项目定位了Google API版本8。
请建议我在这里缺少什么？
如果您使用的是Google Maps V2，请查看此页面：http://components.xamarin.com/view/googleplayservices/
如果您的目标是API 8，请不要忘记引用Mono.Android.Support.v4，并相应地使用这些元素！
这是我的布局的样子：
<FrameLayout
android:id="@+id/mapView"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:clickable="true"
android:longClickable="true"
android:layout_below="@+id/textLayout"
android:layout_above="@+id/footerLayout" />
而我的班级：
public class GoogleMapActivity : Android.Support.V4.App.FragmentActivity
{
protected override void OnCreate(Bundle bundle)
{
var fragTx = SupportFragmentManager.BeginTransaction();
var mapFragment = Android.Gms.Maps.SupportMapFragment.NewInstance(mapOptions);
fragTx.Add(Resource.Id.mapView, mapFragment, "mapView");
fragTx.Commit();
}
}
这不是你的问题的答案，而是另一种选择;
我一直在使用leaflet和/或mapbox的OpenStreetMaps使用xamarin而不是android。虽然我不确定你是否可以过滤加油站等。
这是我用来渲染移动地图的代码片段;
public class MainActivity : Activity//, ILocationListener
{
private WebView _webView;
private MonkeyWebViewClient _webViewClient;
private MonkeyWebChromeClient _webChromeClient;
...
protected override void OnCreate (Bundle bundle)
{
Log.Verbose (LogAppTag, "Init webview..");
_webView = FindViewById<WebView> (Resource.Id.webView1);
_webView.Settings.JavaScriptEnabled = true;
_webViewClient = new MonkeyWebViewClient (this);
_webChromeClient = new MonkeyWebChromeClient ();
_webViewClient.OnLoadComplete += WebLoadComplete;
_webView.SetWebViewClient(_webViewClient);
_webView.SetWebChromeClient(_webChromeClient);
_webView.LoadUrl("file:///android_asset/Content/Map/Map.html");
...
void WebLoadComplete (object sender, EventArgs e)
{
Log.Verbose(Logging.AppTag, "WebLoadComplete()");
_webView.LoadUrl("javascript:SetLocation(" + _location.Latitude + "," + _location.Longitude + ");");
}
...
class MonkeyWebChromeClient : WebChromeClient {
public override bool OnJsAlert(WebView view, string url, string message, JsResult result)
{
// the built-in alert is pretty ugly, you could do something different here if you wanted to
return base.OnJsAlert(view, url, message, result);
}
}
class MonkeyWebViewClient : WebViewClient
{
public bool LoadingFinished { get; private set; }
public delegate void LoadCompleteHandler(object sender, EventArgs e);
public event LoadCompleteHandler OnLoadComplete;
Activity context;
public MonkeyWebViewClient(Activity context)
{
this.context = context;
}
public override bool ShouldOverrideUrlLoading(WebView view, string url)
{
view.LoadUrl (url);
return true;
}
public override void OnPageStarted (WebView view, string url, Android.Graphics.Bitmap favicon)
{
this.LoadingFinished = false;
base.OnPageStarted (view, url, favicon);
}
public override void OnPageFinished (WebView view, string url)
{
this.LoadingFinished = true;
var handler = OnLoadComplete;
if (handler != null) handler(this, EventArgs.Empty);
base.OnPageFinished (view, url);
}
}
这是我们在webview中加载的html代码;
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<!-- mapbox -->
<script src='http://api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.js'></script>
<link href='http://api.tiles.mapbox.com/mapbox.js/v1.3.1/mapbox.css' rel='stylesheet' />
<!-- mapbox -->
</head>
<style>
body {
padding: 0;
margin: 0;
}
html, body, #map {
height: 100%;
}
</style>
<div id="map"></div>
<script src="JS/Map.js"></script>
</html>
和可以与C＃代码通信的JS代码;你可能想在mapbox上创建一个新的地图并更改raistlinthewiz.map-oukwofv3部分。
// map code.
function SetLocation(lat, lng)
{
var latlng = new L.LatLng(parseFloat(lat), parseFloat(lng));
// mapbox
var map = L.mapbox.map('map', 'raistlinthewiz.map-oukwofv3').setView(latlng, 18);
L.mapbox.markerLayer({ // this feature is in the GeoJSON format: see geojson.org for the full specification
type: 'Feature',
geometry: {
type: 'Point', // coordinates here are in longitude, latitude order because x, y is the standard for GeoJSON and many formats
coordinates: [parseFloat(lng), parseFloat(lat)]
},
properties: { // one can customize markers by adding simplestyle properties http://mapbox.com/developers/simplestyle/
title: 'A Single Marker',
description: 'Just one of me',
'marker-size': 'large'
}
}).addTo(map);
}
如果您还需要，我可以提供使用香草小叶的样品。