java代码调用js

1.webview.loadUrl

2.jsevaluator 内部实现也是webview.loadUrl
GitHub - codebymikey/js-evaluator-for-android: A library for running JavaScript in Android apps.

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3.JS in Android (Google V8)
J2V8就是对V8 JavaScript 引擎 的 Java 封装，所以在Java中如果引入了J2V8，我们就可以在Java中运行JavaScript代码。
implementation 'com.eclipsesource.j2v8:j2v8:5.0.103@aar'

https://gitee.com/huangxiaoguo/J2V8.git
test.js
var hisV1 = 0
function myFunction(p1, p2,callback) {
    callback(p1,p2)
    hisV1 = p1
    return p1 * p2;
}

V8 runtime = V8.createV8Runtime();
runtime.executeScript(loadJs("real_library/test.js"));
V8Function function = new V8Function(runtime, new JavaCallback() {
    @Override
    public Object invoke(V8Object v8Object, V8Array v8Array) {
      Log.e("RealLibrary",  v8Array.getInteger(0)+"" + v8Object);
      return null;
    }
});
V8Array push = new V8Array(runtime).push(10).push(20).push(function);
runtime.executeVoidFunction("myFunction",push);
function.close();
push.close();
runtime.close();