問題描述

我有一個應用程序，單擊列表中的項目會顯示注入了 javascript 的 webview.我需要保存 webview 對象，以便當用戶再次按下相同的項目時，會顯示現有的 webview，而不是重新加載它并注入再次使用javascript.我可以將webview對象保存在應用程序類中webview的Arraylist中.

I have an application where clicking on an item in a list shows webview with javascript injected.I need to save the webview object so that when the user presses the same item again the existing webview is shown instead of reloading it and injecting the javascript again.I am able to save the webview object in Arraylist of webview inside the application class.

我檢查該項目是否已存在于 Arraylist 中，如果存在，則獲取相應的對象并將該對象設置為活動的內容，如下所示.

I check whether the item already exists in the Arraylist and if it do exists take the corresponding object and set the object as the content of the activity as shown below.

     temp_WebView=new WebView(this);                
     temp_WebView=(WebView)application.getWebview(j);
     ViewGroup parent = (ViewGroup) application.getWebview(j).getParent();
     parent.removeView(application.getWebview(j));  
     setContentView(temp_WebView);

This works fine but when clicking on any of the select box inside the webview where a dialog is populated it gets crashed  with the following error,


WARN/WindowManager(60): Attempted to add application window with unknown token HistoryRecord{4506d1e8 tabviewapp.com/.Webresults}.  Aborting.

 DEBUG/AndroidRuntime(500): Shutting down VM

 WARN/dalvikvm(500): threadid=1: thread exiting with uncaught exception (group=0x4001d800)    
 ERROR/AndroidRuntime(500): FATAL EXCEPTION: main    
 ERROR/AndroidRuntime(500): android.view.WindowManager$BadTokenException: Unable to  add window -- token android.os.BinderProxy@45034510 is not valid; is your activity running?
 ERROR/AndroidRuntime(500): at android.view.ViewRoot.setView(ViewRoot.java:505)
 ERROR/AndroidRuntime(500): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)

 ERROR/AndroidRuntime(500):  at      android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)

 ERROR/AndroidRuntime(500):     at android.view.Window$LocalWindowManager.addView(Window.java:424)

 ERROR/AndroidRuntime(500):     at android.app.Dialog.show(Dialog.java:241)

 ERROR/AndroidRuntime(500):     at android.webkit.WebView$InvokeListBox.run(WebView.java:7095)

 ERROR/AndroidRuntime(500):     at android.os.Handler.handleCallback(Handler.java:587)

 ERROR/AndroidRuntime(500):     at android.os.Handler.dispatchMessage(Handler.java:92)

 ERROR/AndroidRuntime(500):     at android.os.Looper.loop(Looper.java:123)

 ERROR/AndroidRuntime(500):     at android.app.ActivityThread.main(ActivityThread.java:4627)

 ERROR/AndroidRuntime(500):     at java.lang.reflect.Method.invokeNative(Native Method)

 ERROR/AndroidRuntime(500):     at java.lang.reflect.Method.invoke(Method.java:521)

 ERROR/AndroidRuntime(500):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)

 ERROR/AndroidRuntime(500):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

 ERROR/AndroidRuntime(500):     at dalvik.system.NativeStart.main(Native Method)

 WARN/ActivityManager(60):   Force finishing activity tabviewapp.com/.Webresults

我認為問題在于 webview 的上下文，但無法弄清楚如何為現有對象設置上下文或將上下文傳遞給 webview 內部生成的對話框.

I think the problem is with the context of the webview but not able to figure out how to set the context for the existing object or pass context to dialog generated inside the webview.

提前致謝.

推薦答案

我遇到了類似的問題.在我的例子中，webview 在一個 ActivityGroup 中.ActivityGroups 和對話框不能開箱即用.在我的情況下，我必須不使用它作為上下文，而是使用 getParent().

I had a similar problem. In my case the webview was in an ActivityGroup. ActivityGroups and dialogs don't work out of the box. In my case I had to not use this as context, instead use getParent().

temp_WebView=new WebView(getParent());

這篇關于Webview 在選擇框或任何對話框上崩潰的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！