Android Question CalledFromWrongThreadException Error

hanyelmehy · Jun 29, 2017

i use this code

B4X:

Private Wve As WebViewExtras
Private MyWeb As WebView
Wve.addJavascriptInterface(MyWeb, "B4A")
Wve.addWebChromeClient(MyWeb,"")
Sub MyWeb_PageFinished (Url As String)
    Dim Javascript As String
    Javascript="B4A.CallSub('Process_HTML', false, document.documentElement.outerHTML)"
    Wve.executeJavascript(MyWeb, Javascript)
End Sub

every thing work fine in debug mode ,in release mode i get this error

B4X:

(CalledFromWrongThreadException) android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
texttrnaslate_process_html (java line: 841)
android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
    at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6823)
    at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:975)
    at android.view.ViewGroup.invalidateChild(ViewGroup.java:5125)
    at android.view.View.invalidateInternal(View.java:12774)
    at android.view.View.invalidate(View.java:12710)
    at android.widget.TextView.invalidateRegion(TextView.java:5405)
    at android.widget.TextView.invalidateCursor(TextView.java:5348)
    at android.widget.TextView.spanChange(TextView.java:8351)
    at android.widget.TextView$ChangeWatcher.onSpanAdded(TextView.java:10557)
    at android.text.SpannableStringBuilder.sendSpanAdded(SpannableStringBuilder.java:1053)
    at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:759)
    at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:658)
    at android.text.Selection.setSelection(Selection.java:76)
    at android.text.Selection.setSelection(Selection.java:87)
    at android.text.method.ArrowKeyMovementMethod.initialize(ArrowKeyMovementMethod.java:336)
    at android.widget.TextView.setText(TextView.java:4555)
    at android.widget.TextView.setText(TextView.java:4424)
    at android.widget.EditText.setText(EditText.java:84)
    at android.widget.TextView.setText(TextView.java:4379)
    at anywheresoftware.b4a.objects.TextViewWrapper.setText(TextViewWrapper.java:43)
    at anywheresoftware.b4a.objects.EditTextWrapper.setText(EditTextWrapper.java:214)
    at dic.test.texttrnaslate._process_html(texttrnaslate.java:841)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:169)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:157)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:153)
    at uk.co.martinpearman.b4a.webviewextras.WebViewExtras$1B4AJavascriptInterface.CallSub(WebViewExtras.java:73)
    at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
    at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:41)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.os.HandlerThread.run(HandlerThread.java:61)

any idea how to solve this error ,Thank you

JordiCP · Jun 30, 2017

Not sure since I am not used to webviews, but the cause could be that the event (_PageFinished) is called from another thread (the one that was in charge of the task) and what you execute directly from it is not allowed to touch the UI thread (in debug mode the behavior will be different)

If this is the case, you could execute what is inside the 'MyWeb_PageFinished' in another Sub and invoke it with CallSubDelayed

B4X:

Private Wve AsWebViewExtrasPrivate MyWeb AsWebView
Wve.addJavascriptInterface(MyWeb, "B4A")
Wve.addWebChromeClient(MyWeb,"")

Sub WhatWillBeExecuted(Url as String)
   Dim Javascript AsString
   Javascript="B4A.CallSub('Process_HTML', false, document.documentElement.outerHTML)"
   Wve.executeJavascript(MyWeb, Javascript)
End Sub

Sub MyWeb_PageFinished (Url AsString)
   CallSubDelayed2(Me,"WhatWillBeExecuted",Url)
End Sub

hanyelmehy · Jun 30, 2017

JordiCP said:
Not sure since I am not used to webviews, but the cause could be that the event (_PageFinished) is called from another thread (the one that was in charge of the task) and what you execute directly from it is not allowed to touch the UI thread (in debug mode the behavior will be different)

If this is the case, you could execute what is inside the 'MyWeb_PageFinished' in another Sub and invoke it with CallSubDelayed

B4X:

Private Wve AsWebViewExtrasPrivate MyWeb AsWebView Wve.addJavascriptInterface(MyWeb, "B4A") Wve.addWebChromeClient(MyWeb,"") Sub WhatWillBeExecuted(Url as String) Dim Javascript AsString Javascript="B4A.CallSub('Process_HTML', false, document.documentElement.outerHTML)" Wve.executeJavascript(MyWeb, Javascript) End Sub Sub MyWeb_PageFinished (Url AsString) CallSubDelayed2(Me,"WhatWillBeExecuted",Url) End Sub

Thank you for your help ,but still have same error

JordiCP · Jun 30, 2017

Are you using threads?

--EDIT--
Seems that @mangojack suggested a solution HERE. Have you tried changing the parameter from false to true?

hanyelmehy · Jun 30, 2017

JordiCP said:
Are you using threads?

--EDIT--
Seems that @mangojack suggested a solution HERE. Have you tried changing the parameter from false to true?

This Work ,Thank you

Android Question CalledFromWrongThreadException Error

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hanyelmehy

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