关键代码快速定位-StringBuilder

Java.perform(function () {
    console.log("start hooking...");
    function showstack() {
        var log = Java.use("android.util.Log");
        var Throwable = Java.use("java.lang.Throwable");
        console.log(log.getStackTraceString(Throwable.$new()))
    }
    var stringBuilder = Java.use("java.lang.StringBuilder");
    stringBuilder.toString.implementation = function () {
        var result = this.toString.apply(this, arguments);
     //   if(result == "username=18888888888"){
        showstack();
            console.log("stringBuilder.toString is called!", result);
    //    }
        return result;
    }
})

值得注意的是，我们打印堆栈的时候，不能一上来就直接打印，Frida容易挂掉；
需要过滤再进行打印