Geek Answers Handbook

Android - How can I bind a WebView to an Activity after creating it using the application context?

I am creating an Android WebView in the background using the Application Context so that it is loaded and ready when I need to display it. I attach it to my work using addView when necessary. This basically works fine, however, when I try to open the HTML dropdown, I get a crash:

android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
  at android.view.ViewRootImpl.setView(ViewRootImpl.java:540)
  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:259)
  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
  at android.app.Dialog.show(Dialog.java:286)
  at com.android.org.chromium.content.browser.input.SelectPopupDialog.show(SelectPopupDialog.java:217)
  at com.android.org.chromium.content.browser.ContentViewCore.showSelectPopup(ContentViewCore.java:2413)
  at com.android.org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
  at com.android.org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:27)
  at android.os.Handler.dispatchMessage(Handler.java:102)
  at android.os.Looper.loop(Looper.java:136)
  at android.app.ActivityThread.main(ActivityThread.java:5017)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:515)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
  at dalvik.system.NativeStart.main(Native Method)

I assume this is because I created a WebView with ApplicationContext. My question is: is there a way around this problem? Is there a way to “link” an existing WebView to another Control or Window to create a dialog? Is there a way to “hack” this together using Reflection by changing the context at runtime?

EDIT: , MutableContextWrapper, , , !

+4
1

, ( WebView Fragment, , Activity), , . WebView, Activity WebView, .

, , :

public static boolean setContext(View v, Context ctx) {
    try {
        final Field contextField = View.class.getDeclaredField("mContext");
        contextField.setAccessible(true);
        contextField.set(v, ctx);
        return (v.getContext() == ctx);
    } catch (IllegalAccessException | NoSuchFieldException e) {
        Log.e(TAG, String.valueOf(e), e);
        return false;
    }
}

mContext View true, . ( , YMMV) MutableContextWrapper. , WebView Activity Context, MutableContextWrapper. , , , WebView Context MutableContextWrapper, Context Activity. , - , :

MutableContextWrapper contextWrapper = new MutableContextWrapper(activity);

WebView webView = (WebView) LayoutInflater.from(contextWrapper)
        .inflate(R.layout.your_webview_layout, theParent, false);

, Activity:

if (webView.getContext() instanceof MutableContextWrapper) {
    ((MutableContextWrapper) webView.getContext()).setBaseContext(newActivity);
}
+3

More articles:


All Articles