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Xposed - How to hook a method with primitive-type parameter

Xposed Framework is a great tool to take actions which Android SDK doesn't provide for developers. One of the great hacks that you can do is hooking a method. You can see parameters given to a method, with many other properties of it. There are some tutorials on Internet, but in this tutorials, they show hooking method without parameters or with class parameters. Its code is:

findAndHookMethod("com.android.settings.Settings", lpparam.classLoader, 
            "updateHeaderList", List.class, new XC_MethodHook() {
    @Override
    protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
        //your code
    }
});
If a parameter of method is primitive type, you cannot call it by its class type. For example; if the parameter is boolean, Boolean.class will not work and it will result NoSuchMethodError exception. The correct way is:

findAndHookMethod("android.net.wifi.WifiManager", lpparam.classLoader, 
            "setWifiEnabled", "boolean",  new XC_MethodHook() {
    @Override
    protected void beforeHookedMethod(MethodHookParam param) throws Throwable {
        param.args[0] = false;
        XposedBridge.log("isWifiEnabled method will keep state as disabled..");
    }
});
You need to pass a String to indicate parameter type. In this case, "boolean" will work. Thus, to point out primitive paramter type, we must pass a string with type name such as 'int', 'boolean' etc.

Comments

  1. Thank you for this! Not only did I need to learn how to hook a method with xposed but by coincidence the xposed module im planning on writing is actually needing to hook android.net.wifi.wifimanager ! what a wonderful and strange coincidence thats the one you choose for this example!

    ReplyDelete
  2. what would the string reference to a byte[] (byte array) be? Also, if multiple parameters, how are they delineated? e.x: "boolean", "bytearray"? or "boolean, bytearray"?

    ReplyDelete
  3. what about if it take string param ?!

    ReplyDelete
  4. So i don't know if you'll read this. But i have a method that is called vpn(); this method doesn't have any parameter and i need it to return false. How can i do this?

    ReplyDelete

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