[TIMOB-5824] Android: WebView.evalJS Causes Form Input Fields to Lost/Not Retain Focus

Problem Description

I'm using the WebView's evalJS function in a setInterval() to act as a bridge between Titanium and a web app from a remote web server. However, form fields in the web app on Android do not work -- I can tap into the form field, but the keyboard never comes up, or if it does, it disappears immediately.

Actual Results

The keyboard never comes up, with an error like this: ERROR: Error: Only the original thread that created a view hierarchy can touch its views.

Expected Results

The keyboard working just fine.

Test Case

1. Create new mobile project 2. Drop the following in app.js and run it on a simulator or actual device. Tap into the Google search box, and the keyboard may briefly appear before disappearing; either way you won't be able to type into the box.

var window = Titanium.UI.createWindow({
    title: "WebView.evalJS Focus Problem!"
});

var webViewOptions = {
  url: "http://www.google.com"
};

var webView = Ti.UI.createWebView(webViewOptions);
webView.addEventListener("load", function(e) {
	setInterval(doSomething, 1000);
});

window.add(webView);
window.open();

function doSomething() {
	try {
		var result = webView.evalJS("doSomethingOnTheWebView();");
	}
	catch(e) {
		Ti.API.info("\n\n\n\nERROR: " + e);
	}
}

Extra info

I have noticed that removing the try/catch block in the "doSomething" method causes the entire app to crash with a Java error, something about "JavaException: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views." To get around that error, I tried creating the WebView in the doSomething() method so that the WebView was created in the same thread in which it was used. This seemed to fix the error in the example given above, but in the app I'm building (which I unfortunately can't share in this public setting) the input boxes still lost focus. This same problem was reported on the Q&A several months ago, with no apparent resolution: http://developer.appcelerator.com/question/119845/using-webviewevaljs-and-lost-focus-android#comment-100385 I should add that the "lost focus" problem does not appear on the iOS simulator, using the app.js listed here.