Android中的速度更快：使用loadUrl将数据发送到WebView或使用JavascriptInterface从WebView检索数据？

Question

I'm writing an Android app where I have to transfer many integers from my app's Java code to the Javascript in a WebView , so that they are displayed to the user.

I see two ways of transferring this string:

• Using loadUrl on the WebView:

With an array data containing ints, I would use this code to transfer them to my webview.

webView.loadUrl("javascript:loadData(" + data[0] + ");"); // data[0] is an int
webView.loadUrl("javascript:loadData(" + data[1] + ");"); // data[1] is an int
// etc.

• Using JavascriptInterface :

I have a Java class that holds the data array and exposes a method named getData(int x) , which just returns the value of data[x] . I can declare a JavascriptInterface so that method is visible to my Javascript code, which can then call it and get the data:

webView.addJavascriptInterface(backend, "dataBackend");

My question is this: which approach is faster? I imagine that if I have many elements in data , executing a lot of loadUrl() calls would be slow and buggy. But does the alternative work faster?

Answer 1

In general both loadUrl and jsInterface are not supposed to transfer large amounts of data. But you can try building one large string from those integers and using it instead.