Can't replace return values with setResult

I'm not able to change the return values of a method. The hook is working. Even the logs are correct - but when i actually call the method in another app the real information is shown.

Code:

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findAndHookMethod("android.net.wifi.WifiInfo", lpparam.classLoader, "getSSID",new XC_MethodHook() {
    @Override
    protected void afterHookedMethod(MethodHookParam param) throws Throwable {
        XposedBridge.log("getSSID1 "+(String) param.getResult());                       
        param.setResult("\"Changed\"");
        XposedBridge.log("getSSID2 "+(String) param.getResult());
    }

    @Override
    protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
    }
});

---

Output:

Code:

---

getSSID1 "realSSID"
getSSID2 "Changed"

In app the call actually produces: "realSSID"

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Can you help me with that?

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