How can I make React Native in Android aware of a

问题:

I have a React Native application built with Expo. On How can I add links in a Highcharts tooltip that will open on mobile's browser? I was able to pass a URL to Highcharts so that when a tooltip is clicked, that URL is opened:

return(
    <View style={styles.container}>
        <ChartView
            onMessage={m => this.onMessage(m)}
            config={config}
        />
    </View>

This triggers this method to open the URL:

onMessage = (m) => {
    let data = JSON.parse(m.nativeEvent.data);
    Linking.openURL(data.url)
};

And the URL gets populated through a global variable window.myURL and sending the message with postMessage():

render() {
    let Highcharts = "Highcharts";
    let config ={
        ...
        plotOptions: {
            series: {
                stickyTracking: false,
                point: {
                    events: {
                        click: function(e) {
                            window.postMessage(JSON.stringify({'url': window.myUrl}));
                        }
                    }
                }
            },
        },
        tooltip: {
            useHTML: true,
            formatter: function () {
                window.myUrl = extras.url;
                return `<div class="text">some text</div>`;
            }
    };

This works well on iOS (both physical and emulator), but does not on Android (neither physical nor emulator).

I have gone through different Github issues such as onMessage not called in native code even though sent from webview( android) and react native html postMessage can not reach to WebView and they tend to suggest using some timeout on window.postMessage(). However, I see that even this does not work:

plotOptions: {
    series: {
        point: {
            events: {
                click: function(e) {
                    setTimeout(function() {
                        console.log('bla');
                        window.postMessage(JSON.stringify({'url': window.myUrl}));
                    }, 200);
                }
            }
        }
    },
},

Since even console.log() does not work, it looks to me as if the click event is not being caught by Android.

How can I make Android aware of this event so that I can go through the message and then open the URL?

回答1:

The "click" event is fine. Problem is that, RN core's <WebView> implementation for Android is flawed at polyfilling window.postMessage(). This issue has been well discussed in this github issue.

So it seems the nature of problem, is RN has to polyfill the native window.postMessage for some reason, but the override didn't take place timely, causing window.postMessage calls still made to the native one.

One solution (for Android) proposed in that github issue, is simply stop using the native window.postMessage, and directly use the internal interface, which is the actual polyfill function.

// in place of `window.postMessage(data)`, use:
window.__REACT_WEB_VIEW_BRIDGE.postMessage(String(data))

One heads-up though, this API is not public and might be subject to change in future.