Android WebView loadUrl JavaScript无法使用API​​ <= 18（但可以在API> = 19中使用）

Question

QUESTION:
What do I have to do to make webView.loadUrl(javaScript) work in API 18 or lower (in comparison to API 19 or higher)?

DESCRIPTION OF PROBLEM:
I am using WebView to make a chat.

1. First I load the HTML like so:
2. Then I use loadUrl again to send in the chat message like so:

Chat messages do still get received from other devices but the other devices do not get a single message from the device with API 18 or lower.

I've searched a lot and will continue to search. If you have the answer, any idea that I could test or could redirect me to relevant information please do share. Thank you in advance.

The JavaScript tag in the string is set to lower case (with the same problem):

Answer 1

SOLUTION

I found the problem which was that the (encoded) message parameter sent in the JavaScript function had a line break [ ] in it. Removing that using the split function made it work.

Answer 2

I can't be sure this is what's causing your problem, but try using

webView.loadUrl("javascript:" + theJavaScriptCode);

with lowercase "javascript:" .

API 19+ doesn't care about the case of the JavaScript protocol in loadUrl (though you can use evaluateJavascript() instead anyway in API 19+), but API 18 and down doesn't recognize it unless it's written in lower case.