Doesn't work with cordova-plugin-crosswalk-webview

[jfrumar]

This plugin appears to be working on Android with the system WebView, however fails when using a Crosswalk webview.

It looks like casting a CordovaWebViewEngine.EngineView to a WebView is not possible and results in an exception.

02-09 12:38:24.063 16211 16288 W System.err: java.lang.ClassCastException: org.crosswalk.engine.XWalkCordovaView cannot be cast to android.webkit.WebView 02-09 12:38:24.064 16211 16288 W System.err: at com.phonegap.plugin.mobileaccessibility.DonutMobileAccessibilityHelper.initialize(DonutMobileAccessibilityHelper.java:51) 02-09 12:38:24.064 16211 16288 W System.err: at com.phonegap.plugin.mobileaccessibility.JellyBeanMobileAccessibilityHelper.initialize(JellyBeanMobileAccessibilityHelper.java:42) 02-09 12:38:24.064 16211 16288 W System.err: at com.phonegap.plugin.mobileaccessibility.KitKatMobileAccessibilityHelper.initialize(KitKatMobileAccessibilityHelper.java:40) 02-09 12:38:24.064 16211 16288 W System.err: at com.phonegap.plugin.mobileaccessibility.MobileAccessibility.initialize(MobileAccessibility.java:64) 02-09 12:38:24.064 16211 16288 W System.err: at org.apache.cordova.CordovaPlugin.privateInitialize(CordovaPlugin.java:54) 02-09 12:38:24.064 16211 16288 W System.err: at org.apache.cordova.PluginManager.getPlugin(PluginManager.java:169) 02-09 12:38:24.065 16211 16288 W System.err: at org.apache.cordova.PluginManager.exec(PluginManager.java:120) 02-09 12:38:24.065 16211 16288 W System.err: at org.apache.cordova.CordovaBridge.jsExec(CordovaBridge.java:59) 02-09 12:38:24.065 16211 16288 W System.err: at org.crosswalk.engine.XWalkExposedJsApi.exec(XWalkExposedJsApi.java:40) 02-09 12:38:24.065 16211 16288 W System.err: at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method) 02-09 12:38:24.065 16211 16288 W System.err: at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:53) 02-09 12:38:24.065 16211 16288 W System.err: at android.os.Handler.dispatchMessage(Handler.java:102) 02-09 12:38:24.065 16211 16288 W System.err: at android.os.Looper.loop(Looper.java:148) 02-09 12:38:24.065 16211 16288 W System.err: at android.os.HandlerThread.run(HandlerThread.java:61)

[majornista]

@jfrumar Give it a try now to see if using reflection for getView, getSettings, getTextSize/getTextZoom, and setTextSize/setTextZoom so that the View does not need to be cast as an android.webkit.WebView allows plugin to be compatible with XWalkView and XWalkSettingsInternal.

[hkvstore]

Have the same problem with CrossWalk, It seems that the changes still do not solve the problem.

[majornista]

@hkvstore and @jfrumar Is my change still causing an uncaught exception or is it a problem of CrossWalk not supporting getTextZoom and setTextZoom methods. If it's the later, I may need to refactor the getTextZoom and setTextZoom methods to use getResources().getConfiguration().fontScale.

[hkvstore]

is it a problem of CrossWalk not supporting getTextZoom and setTextZoom methods.

I cannot say for sure, I tested on a real Android phone only, there is no error when calling setTextZoom(), but I suspect the CrossWalk plugin does not support getSettings().

[majornista]

Looks like getSettings() has been added in Version 6 - Crosswalk 17, however it doesn't seem to do anything to the text zoom setting within Crosswalk's Chromium instance.

[JeremyColton]

Hi,
I'm using Cordova 5.0,0, Android 6, CrossWalk 2.0.0, running on Samsung S4 and I get this related error when the app starts up:

09-27 23:40:10.951: E/AndroidRuntime(13802): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myup/com.myup.MobileApp500_Android}: java.lang.ClassCastException: org.crosswalk.engine.XWalkCordovaView cannot be cast to android.webkit.WebView

I don't see errors in my project in Eclipse since I use the command line to build the project via:

cordova android run

The cast complaint is on line 49 which is the 1st line below in my main java class:

WebView webview = (WebView)appView.getView(); 
WebSettings ws = webview.getSettings();
ws.setMediaPlaybackRequiresUserGesture(false);

webview.setHorizontalScrollBarEnabled(false);
webview.setVerticalScrollBarEnabled(true);
webview.setVerticalScrollbarOverlay(true);
webview.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);

BigDecimal scale = new BigDecimal(width).divide(new BigDecimal(320)).multiply(new BigDecimal(100));
double globalScale = scale.setScale(3, RoundingMode.CEILING).doubleValue();
webview.getSettings().setRenderPriority( RenderPriority.HIGH );
webview.setInitialScale( (int)globalScale );

So how can I fix this (many thanks) ?

Also, since I am running Android 5.0 which has a new Chrome/53.0.2785.124 Mobile, does the browser that comes with CrossWalk offer any javascript speed advantages?

[majornista]

@JeremyColton I don't think that you can cast the org.crosswalk.engine.XWalkCordovaView as a android.webkit.WebView. You can see how I work around this here: https://github.com/phonegap/phonegap-mobile-accessibility/blob/master/src/android/com/phonegap/plugin/mobileaccessibility/MobileAccessibility.java#L139