Run custom javascript in android app webview

Question

Is there a way to manipulate the loaded HTML or just run custom JavaScript over a loaded webpage?

I do not have access to the server I am loading from so I do not have that option.

loadUrl("javascript:blahblah");

jyoonPro
– jyoonPro

2014-06-12 15:49:23 +00:00
Commented Jun 12, 2014 at 15:49 — jyoonPro
– jyoonPro, Commented Jun 12, 2014 at 15:49

tophyr · Accepted Answer · 2014-06-12 18:14:46Z

1

Call loadUrl("javascript:<your JS here>"); on the webview.

As of 4.4, you can also call the method evaluateJavascript(String script, ValueCallback<String> resultCallback) that will do a much nicer job. loadUrl will execute asynchronously with no return value (you have to jump through a lot of hoops in order to get a value back, including setting up a Java<->JS bridge and using thread synchronization in order to get a result). evaluateJavascript still executes asynchronously but the provided callback will be executed on the UI thread and is a much, much nicer way to go about things.

answered Jun 12, 2014 at 18:14

tophyr

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1 Comment

Leah Sapan Over a year ago

I didn't think getting a value back would even be possible. This is great, thanks!

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