Frida动态加载Dex

Frida加载Dex用​​Java.openClassFile​​​方法。
使用dex方法之前，需要加载一下：​​​load()​​​。
创建实例（​​​$new()​​​），需要在主线程里运行：​​Java.scheduleOnMainThread​​。

function load_dex() {
    var DecodeUtilsDex = Java.openClassFile("/data/local/tmp/DecodeUtils.dex");
    console.log("DecodeUtilsDex:", DecodeUtilsDex);
    Java.perform(function() {
        DecodeUtilsDex.load();
        var DecodeUtils = Java.use("com.example.androiddemo.DecodeUtils");
        console.log(DecodeUtils);
        var FridaActivity = Java.use("com.github.androiddemo.Activity.FridaActivity");
        Java.scheduleOnMainThread(function() {
            console.log(DecodeUtils.$new().decode(FridaActivity.$new().password.value));
        })
    });
}

参考：https://frida.re/docs/javascript-api/
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Java.openClassFile(filePath): open the .dex file at filePath,
returning an object with the following methods:

load(): load the contained classes into the VM.

getClassNames(): obtain an array of available class names.