JavaFX Webview 与 Android 的 Webview 的兼容性如何? [英] How compatible is JavaFX Webview with Android's Webview?

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问题描述

我一直在尝试将使用 Netbeans 和 Gradle 的 JavaFX 项目移植到 Android APK 文件格式中，并且在大多数情况下它运行良好！我遇到的问题特别是 Android 的 WebView 组件?我可以让它在 Android Webview 中显示静态网页，而我的应用程序不会因致命异常而崩溃.但是，如果我使用 JavaScript 在 JavaFX Webview 中创建动态网页，Androids Webview 似乎根本无法应对?

I've been trying to port a JavaFX project using Netbeans and Gradle into an Android APK file format and for the most part it works well! The issue I'm having is with the WebView component of Android in particular? I can get it to show a static webpage in Android Webview without my app falling over with a FATAL EXCEPTION. But if I create a dynamic webpage in JavaFX Webview using JavaScript, Androids Webview doesn't appear to cope at all?

尽管在 JavaFX 中我将启用 JavaScript 设置为 true:

Eventhough in JavaFX I set enable JavaScript to true:

googleMapEngine.setJavaScriptEnabled(true);

我知道在 Android Webview 中 - JavaScript 默认关闭.我无法让它在 Android 中工作.另外，Android Webview 知道如何解析JavaFX命令吗?

As I'm aware that in Android Webview - JavaScript is switched off by default. I cannot get it to work in Android. In addition, does Android Webview know how to resolve the JavaFX command?

googleMapEngine.executeScript(String);

因为如果我尝试这个:

googleMapEngine.executeScript(
      "var latlng = new google.maps.LatLng(59.438722, 24.745278);" +
      "var myOptions = {" + 
           "zoom: 15," +
           "center: latlng," +
           "mapTypeId: google.maps.MapTypeId.ROADMAP," +
           "mapTypeControl: false," +
           "navigationControl: false," +
           "streetViewControl: false," +
           "backgroundColor: '#666970'," +
           "disableDefaultUI: true" +
      "};" +
      "" +
      "var map = new google.maps.Map(document.getElementById('map_canvas'), myOptions);");

我最终在 logcat 中出错:

I end up with error in logcat:

    I/System.out(  809): [JVDBG] Error firing event

W/System.err(  809): java.lang.ClassNotFoundException: com.sun.webkit.NativeWebView

W/System.err(  809):    at java.lang.Class.classForName(Native Method)

W/System.err(  809):    at java.lang.Class.forName(Class.java:309)

W/System.err(  809):    at com.oracle.dalvik.InternalWebView._fireLoadEvent(InternalWebView.java:347)

W/System.err(  809):    at com.oracle.dalvik.InternalWebView.fireLoadEvent(InternalWebView.java:140)

W/System.err(  809):    at com.oracle.dalvik.InternalWebView.access$400(InternalWebView.java:43)

W/System.err(  809):    at com.oracle.dalvik.InternalWebView$MyJavaScriptInterface.processHTML(InternalWebView.java:363)

W/System.err(  809):    at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)

W/System.err(  809):    at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:39)

W/System.err(  809):    at android.os.Handler.dispatchMessage(Handler.java:102)

W/System.err(  809):    at android.os.Looper.loop(Looper.java:145)

W/System.err(  809):    at android.os.HandlerThread.run(HandlerThread.java:61)

W/System.err(  809): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.sun.webkit.NativeWebView" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

W/System.err(  809):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

W/System.err(  809):    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

W/System.err(  809):    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

W/System.err(  809):    ... 11 more

W/System.err(  809):    Suppressed: java.lang.ClassNotFoundException: com.sun.webkit.NativeWebView

W/System.err(  809):        at java.lang.Class.classForName(Native Method)

W/System.err(  809):        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)

W/System.err(  809):        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)

W/System.err(  809):        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)

W/System.err(  809):        ... 12 more

W/System.err(  809):    Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

E/AndroidRuntime(  809): FATAL EXCEPTION: JavaFX Application Thread

E/AndroidRuntime(  809): Process: com.SundaeThePugApp, PID: 809

E/AndroidRuntime(  809): java.lang.UnsupportedOperationException: Not supported yet.

E/AndroidRuntime(  809):    at com.sun.webkit.WebPage.executeScript(WebPage.java:153)

E/AndroidRuntime(  809):    at javafx.scene.web.WebEngine.executeScript(WebEngine.java:860)

E/AndroidRuntime(  809):    at com.SundaeThePugApp.SundaeThePugController$1.changed(SundaeThePugController.java:202)

E/AndroidRuntime(  809):    at com.SundaeThePugApp.SundaeThePugController$1.changed(SundaeThePugController.java:200)

E/AndroidRuntime(  809):    at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)

E/AndroidRuntime(  809):    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)

E/AndroidRuntime(  809):    at javafx.beans.property.ReadOnlyObjectWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(ReadOnlyObjectWrapper.java:176)

E/AndroidRuntime(  809):    at javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:142)

E/AndroidRuntime(  809):    at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)

E/AndroidRuntime(  809):    at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)

E/AndroidRuntime(  809):    at javafx.scene.web.WebEngine$LoadWorker.updateState(WebEngine.java:1023)

E/AndroidRuntime(  809):    at javafx.scene.web.WebEngine$LoadWorker.dispatchLoadEvent(WebEngine.java:1134)

E/AndroidRuntime(  809):    at javafx.scene.web.WebEngine$LoadWorker.access$1000(WebEngine.java:1016)

E/AndroidRuntime(  809):    at javafx.scene.web.WebEngine$PageLoadListener.dispatchLoadEvent(WebEngine.java:1003)

E/AndroidRuntime(  809):    at com.sun.webkit.WebPage.fireLoadEvent(WebPage.java:251)

E/AndroidRuntime(  809):    at com.sun.webkit.NativeWebView$1.run(NativeWebView.java:100)

E/AndroidRuntime(  809):    at com.sun.javafx.application.PlatformImpl.lambda$null$155(PlatformImpl.java:295)

E/AndroidRuntime(  809):    at com.sun.javafx.application.PlatformImpl.access$lambda$18(PlatformImpl.java)

E/AndroidRuntime(  809):    at com.sun.javafx.application.PlatformImpl$$Lambda$19.run(Unknown Source)

E/AndroidRuntime(  809):    at java.security.AccessController.doPrivileged(AccessController.java:52)

E/AndroidRuntime(  809):    at com.sun.javafx.application.PlatformImpl.lambda$runLater$156(PlatformImpl.java:294)

E/AndroidRuntime(  809):    at com.sun.javafx.application.PlatformImpl.access$lambda$5(PlatformImpl.java)

E/AndroidRuntime(  809):    at com.sun.javafx.application.PlatformImpl$$Lambda$6.run(Unknown Source)

E/AndroidRuntime(  809):    at com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)

E/AndroidRuntime(  809):    at com.sun.glass.ui.monocle.RunnableProcessor.run(RunnableProcessor.java:51)

E/AndroidRuntime(  809):    at java.lang.Thread.run(Thread.java:818)

V/ApplicationPolicy( 3468): isApplicationStateBlocked userId 0 pkgname com.SundaeThePugApp

V/ApplicationPolicy( 3468): isApplicationStateBlocked userId 0 pkgname com.SundaeThePugApp

V/ApplicationPolicy( 3468): isApplicationStateBlocked userId 0 pkgname com.sec.android.app.launcher

欢迎所有反馈:)

推荐答案

好的，经过多次试验和错误，我得出的结论是 JavaFXPorts 总体上非常好，但它们有一些警告:

OK after much trial and errors I have come to the conclusion that JavaFXPorts on the whole is damn good, but their are some caveats:

1) 您的应用目前无法使用媒体和音频功能，因为它会引发致命异常.

1) Media and Audio capabilities are not possible with your app at present as it throws a Fatal Exception.

2) Webview 仅限于呈现非 javascript 网站.

2) Webview is limited to rendering non javascript websites.

我会解释，如果我使用:

I'll explain, if I use:

googleMapEngine.load("http://fxexperience.com/");

完美，一切正常，页面呈现正确.

但是如果我这样做:

googleMapEngine.setJavaScriptEnabled(true);    
googleMapEngine.load("https://www.openstreetmap.org/");

我得到NO地图，我在我的应用程序中只能看到打开的街道地图徽标和菜单按钮，否则网络视图的其余部分是白色的！同样在 JavaFX 中启用 JavaScript 似乎对 Android 网页视图没有影响，将 Android 默认设置 设为 false！

I get NO map and all I can see in my app is the open street map logo and a menu button, otherwise the rest of the webview is white! Also enabling JavaScript in JavaFX seems to have no effect on Androids webview leaving Androids default setting to false!

如果我尽可能使用最简单的 Google 地图网址呢:

What about if I do the most simplest Google Map url possible:

googleMapEngine.setJavaScriptEnabled(true);    
googleMapEngine.load("https://www.google.com/maps/");

我什么也没有，只有白屏！同样在 JavaFX 中启用 JavaScript 似乎对 Android 网页视图没有影响，将 Android 默认设置 设为 false！

I get nothing but a white screen! Also enabling JavaScript in JavaFX seems to have no effect on Androids webview leaving Androids default setting to false!

如果我创建了一个路径正确的本地 html 文件:

if I do a local html file with its path correctly made:

googleMapEngine.setJavaScriptEnabled(true);
googleMapEngine.load(getClass().getClassLoader().getResource("googleLondonMap.html").toExternalForm());

我在 Android 网络视图中收到一个 net::ERR_UNKNOWN_URL_SCHEME.

I receive a net::ERR_UNKNOWN_URL_SCHEME in the Android webview.

最后，由于 Android 的 Webview 默认 javascript 设置设置为 false.这意味着如果您尝试使用 JavaFX 语句:

Finally, as Androids Webview default javascript setting is set to false. This means if ever you try to use JavaFX statement:

googleMapEngine.executeScript(foo());

这会导致您的 Android 应用出现致命异常.如果 Johan Vos 和 Co 能够克服这些 Android WebView 移植问题，并在未来更新他们在 JavaFXPorts 上的出色工作，那就太好了！

It will cause a FATAL EXCEPTION in your android app. It would be sweet if Johan Vos and Co can overcome these Android WebView porting issues with future updates to their excellent work on JavaFXPorts!

这篇关于JavaFX Webview 与 Android 的 Webview 的兼容性如何?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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