…bject, the Android "handle" method will get an "undefined" String.

…N String to JavaScript because _dispatchMessageFromJava function fails to parse the JSON String.

Create a convenience interface for injecting data(initialising WebView with pre-fetched data) when the page loads completely to avoid adding another WebViewClient.
Example:
````java
        bridge.setLoadFinishedCallback(new WebViewJavascriptBridge.LoadFinishedCallback() {
            @OverRide
            public void onLoadFinished() {
                bridge.send("Test data to send", new WebViewJavascriptBridge.WVJBResponseCallback() {
                    @OverRide
                    public void callback(String data) {
                        Log.d("test", "Got response! " + data);
                    }
                });
            }
        });
````

Update WebViewJavascriptBridge.java

BugFix: When JavaScript calls a registered Android method with JSON Obje...

Update for API > 19

Replacing LoadingFinishedCallback with custom WebViewClient