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I am having trouble calling basic JavaScript functions from within Android. When I cloned the repository from this tutorial, and then stripped it down I was able to get the code to function correctly. However, when trying to create my own fresh project I have been unsuccessful.
I have referenced the following posts and appear to be doing the same, but to no avail. There is no noticeable different between the approaches, so I feel like there may be dependencies outside of these files that I am missing?
Android Calling JavaScript functions in WebView
Run javascript code in Webview
I'm wondering if I am missing something subtle somewhere.
Basically I am just trying to get any output to the console by calling a JavaScript function that is defined in its own file. The project structure is as follows:
main
- assets
- index.html
- sketch.js
- java
- com.mypackage
- MainActivity.java
I have a file sketch.js with the following function inside
function hello() {
console.log("hello world");
}
And an index.html file with the following code
<!DOCTYPE html>
<html>
<head>
<script src="sketch.js" type="text/javascript"></script>
</head>
<body>
<canvas></canvas>
</body>
</html>
Then from my activity class I have the following Java code
webView = (WebView) findViewById(R.id.webView);
webView.setWebChromeClient(new WebChromeClient());
webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("file:///android_asset/index.html");
webView.evaluateJavascript("javascript:hello();", null);
webView.evaluateJavascript("console.log('Hello world 2');", null);
In the console in Android Studio I see
[INFO:CONSOLE(1)] "Uncaught ReferenceError: hello is not defined", source: (1)
I/chromium: [INFO:CONSOLE(1)] "Hello world 2", source: (1)
How can I fix this code to be able to call the simple JavaScript function hello() that is in a separate file?
259
According to CW answer,
You need to wait until your page is loaded
private void helloJs(){
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
webView.evaluateJavascript("javascript:hello();", null);
} else {
webView.loadUrl("javascript:hello();");
}
}
webView.setWebViewClient(new WebViewClient() {
public void onPageFinished(WebView view, String url) {
helloJs();
}
});
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