Error calling method on NPObject! in Android 2.2

Question

I\'m using addJavascriptInterface within my Android application to allow JavaScript to invoke functions I\'ve created in my native Java application.

This worked well

Answer 1

I had the same problem with Javascript-to-Java interface (WebView.addJavascriptInterface).

In Android 2.1 everything worked just fine but in Android 2.2 Javascript failed to call methods from this interface. It returned an error: Uncaught Error: Error calling method on NPObject!

It seems that on Android 2.2, the WebView has problem with Boolean data type returned from interface functions.

Changing:

public Boolean test_func() { return true; }

... to:

public int test_func() { return 1; }

... solved the problem.