如何使用 cesium 和 geoserver 在 android 应用程序中显示 wms 图层?
How to display wms layer in android application using cesium and geoserver?
我尝试在铯球上添加 wms 图层以显示在 android 应用程序中。我正在使用 flutter webview 插件 v0.3.21、geoserver v2.15.1 和 cesium v1.69。
我在真实设备和模拟器中收到此错误和警告:
E/libEGL (23338): validate_display:255 错误 3008 (EGL_BAD_DISPLAY)
W/cr_media(23338):需要蓝牙许可
W/VideoCapabilities(23338):无法识别 video/avc 的配置文件 2130706433
W/AudioCapabilities(23338):不支持的 mime audio/alac
W/AudioCapabilities(23338):不支持的 mime audio/dsd
W/VideoCapabilities(23338):不支持的 MIME video/divx
W/VideoCapabilities(23338): 不支持的 mime video/divx311
W/VideoCapabilities(23338): 不支持的 mime video/divx4
W/VideoCapabilities(23338):不支持的 MIME video/mp4v-esdp
I/VideoCapabilities(23338):video/mp4v-es 不支持配置文件 4
I/flutter (23338): 在 FLUTTER Webview 中打开 html 文件(对于铯)
I/flutter (23338): flutter 测试 webview
I/chromium(23338): [INFO:CONSOLE(1)] "An error occurred in "WebMapServiceImageryProvider": 无法获取图像切片 X: 0 Y: 0 级别: 0", 来源: https://cesium.com/downloads/cesiumjs/releases/1.68/Build/Cesium/Cesium.js ( 1)
I/chromium(23338):[信息:控制台(1)]
..........
"WebMapServiceImageryProvider" 发生错误:无法获取图像块 X: 3 Y: 1 级别:1.",来源:https://cesium.com/downloads/cesiumjs/releases/1.68/Build/Cesium/Cesium.js (1)
这是源代码
cesium.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="https://cesium.com/downloads/cesiumjs/releases/1.69/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.69/Build/Cesium/Widgets/widgets.css"
rel="stylesheet">
</head>
<body>
<div id="cesiumContainer" style="width: 100%; height:300px"></div>
<script>
var widget = new Cesium.CesiumWidget('cesiumContainer');
var url='http://localhost:8080/geoserver/wms/'; //Geoserver URL
var layers = widget.scene.globe.imageryLayers;
layers.removeAll();
layers.addImageryProvider(new Cesium.WebMapServiceImageryProvider({
url : url,
layers: 'workspace:layer_name'
}));
</script>
</body>
</html>
main.dart
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
void main() => runApp(MaterialApp(home: LocalHtmlPage()));
class LocalHtmlPage extends StatefulWidget {
@override
_OpenHTMLPageState createState() => _OpenHTMLPageState();
}
class _OpenHTMLPageState extends State<LocalHtmlPage> {
WebViewController _webViewController;
String filePath = 'assets/cesium.html';
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Cesium Example')),
body: WebView(
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (WebViewController webViewController) {
_webViewController = webViewController;
_loadHtmlFromAssets();
},
onPageStarted: (url) {
//Invoked when a page starts loading.
print('Open html file (for cesium) in FLUTTER Webview');
EasyLoading.show(status: 'loading...');
},
onPageFinished: (url) {
print('flutter test webview');
EasyLoading.dismiss(animation: false);
},
));
}
_loadHtmlFromAssets() async {
String fileHtmlContents = await rootBundle.loadString(filePath);
_webViewController.loadUrl(Uri.dataFromString(fileHtmlContents,
mimeType: 'text/html', encoding: Encoding.getByName('utf-8'))
.toString());
}
}
pubspec.yaml
cupertino_icons: ^0.1.3
webview_flutter: ^0.3.21
flutter_easyloading: ^1.1.4
easy_web_view: ^1.2.0
我会尝试将您的代码放入 Cesium Sandcastle 中,看看它是否有效。
这里是 Cesium Sandcastle 的示例,显示了来自本地 GeoServer 的地图。
Cesium Sandcastle with GeoServer example
如果 Cesium Sandcastle 失败,您将必须在 GeoServer 中启用 CORS。转到 GeoServer 的 webapps\geoserver\WEB-INF\web.xml 并取消注释所有 CORS 部分,然后重新启动 GeoServer。
https://docs.geoserver.org/latest/en/user/production/container.html#enable-cors
我尝试在铯球上添加 wms 图层以显示在 android 应用程序中。我正在使用 flutter webview 插件 v0.3.21、geoserver v2.15.1 和 cesium v1.69。
我在真实设备和模拟器中收到此错误和警告:
E/libEGL (23338): validate_display:255 错误 3008 (EGL_BAD_DISPLAY) W/cr_media(23338):需要蓝牙许可 W/VideoCapabilities(23338):无法识别 video/avc 的配置文件 2130706433 W/AudioCapabilities(23338):不支持的 mime audio/alac W/AudioCapabilities(23338):不支持的 mime audio/dsd W/VideoCapabilities(23338):不支持的 MIME video/divx W/VideoCapabilities(23338): 不支持的 mime video/divx311 W/VideoCapabilities(23338): 不支持的 mime video/divx4 W/VideoCapabilities(23338):不支持的 MIME video/mp4v-esdp I/VideoCapabilities(23338):video/mp4v-es 不支持配置文件 4 I/flutter (23338): 在 FLUTTER Webview 中打开 html 文件(对于铯) I/flutter (23338): flutter 测试 webview I/chromium(23338): [INFO:CONSOLE(1)] "An error occurred in "WebMapServiceImageryProvider": 无法获取图像切片 X: 0 Y: 0 级别: 0", 来源: https://cesium.com/downloads/cesiumjs/releases/1.68/Build/Cesium/Cesium.js ( 1) I/chromium(23338):[信息:控制台(1)] .......... "WebMapServiceImageryProvider" 发生错误:无法获取图像块 X: 3 Y: 1 级别:1.",来源:https://cesium.com/downloads/cesiumjs/releases/1.68/Build/Cesium/Cesium.js (1)
这是源代码
cesium.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="https://cesium.com/downloads/cesiumjs/releases/1.69/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.69/Build/Cesium/Widgets/widgets.css"
rel="stylesheet">
</head>
<body>
<div id="cesiumContainer" style="width: 100%; height:300px"></div>
<script>
var widget = new Cesium.CesiumWidget('cesiumContainer');
var url='http://localhost:8080/geoserver/wms/'; //Geoserver URL
var layers = widget.scene.globe.imageryLayers;
layers.removeAll();
layers.addImageryProvider(new Cesium.WebMapServiceImageryProvider({
url : url,
layers: 'workspace:layer_name'
}));
</script>
</body>
</html>
main.dart
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:flutter_easyloading/flutter_easyloading.dart';
void main() => runApp(MaterialApp(home: LocalHtmlPage()));
class LocalHtmlPage extends StatefulWidget {
@override
_OpenHTMLPageState createState() => _OpenHTMLPageState();
}
class _OpenHTMLPageState extends State<LocalHtmlPage> {
WebViewController _webViewController;
String filePath = 'assets/cesium.html';
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Cesium Example')),
body: WebView(
javascriptMode: JavascriptMode.unrestricted,
onWebViewCreated: (WebViewController webViewController) {
_webViewController = webViewController;
_loadHtmlFromAssets();
},
onPageStarted: (url) {
//Invoked when a page starts loading.
print('Open html file (for cesium) in FLUTTER Webview');
EasyLoading.show(status: 'loading...');
},
onPageFinished: (url) {
print('flutter test webview');
EasyLoading.dismiss(animation: false);
},
));
}
_loadHtmlFromAssets() async {
String fileHtmlContents = await rootBundle.loadString(filePath);
_webViewController.loadUrl(Uri.dataFromString(fileHtmlContents,
mimeType: 'text/html', encoding: Encoding.getByName('utf-8'))
.toString());
}
}
pubspec.yaml
cupertino_icons: ^0.1.3
webview_flutter: ^0.3.21
flutter_easyloading: ^1.1.4
easy_web_view: ^1.2.0
我会尝试将您的代码放入 Cesium Sandcastle 中,看看它是否有效。
这里是 Cesium Sandcastle 的示例,显示了来自本地 GeoServer 的地图。
Cesium Sandcastle with GeoServer example
如果 Cesium Sandcastle 失败,您将必须在 GeoServer 中启用 CORS。转到 GeoServer 的 webapps\geoserver\WEB-INF\web.xml 并取消注释所有 CORS 部分,然后重新启动 GeoServer。 https://docs.geoserver.org/latest/en/user/production/container.html#enable-cors