React Native auto height WebView doesn't work on android

I'm implementing a WebView with dynamic height. I found the solution that works like a charm on iOS and doesn't work on android. The solution uses JS inside the WV to set the title to the value of the content height. Here's the code:

...
this.state = {webViewHeight: 0};
...
<WebView
    source={{html: this.wrapWevViewHtml(this.state.content)}}
    style={{width: Dimensions.get('window').width - 20, height: this.state.webViewHeight}}
    scrollEnabled={false}
    javaScriptEnabled={true}
    injectedJavaScript="window.location.hash = 1;document.title = document.height;"
    onNavigationStateChange={this.onWebViewNavigationStateChange.bind(this)}
/>
...
onWebViewNavigationStateChange(navState) {
    // navState.title == height on iOS and html content on android
    if (navState.title) {
        this.setState({
            webViewHeight: Number(navState.title)
        });
    }
}
...

But on android the value of the title inside onWebViewNavigationStateChange is equal to page content.

What am I doing wrong?