![]() ![]() The NDK is not designed for use on its own.įor general NDK information common to all cpu targets, see Google’s top Android NDK page. The NDK works with the basic stand-alone “SDK Tools”, and also with the Android Studio IDE or with the older Eclipse ADT IDE. The fundamental Android application model does not change. The whole app runs inside a Java virtual machine on the Android device. Most or all of your native source code will be target independent. A separate native library is included for each cpu architecture you target. The compiled native library gets embedded within your application’s. Those native parts are structured as a library that you call from your Java code. The ‘SuperMath.The Android NDK (Native Development Kit) is a companion toolset to the Android SDK that lets you implement parts of your app using native-compiled languages such as C or C++ instead of Java. The easiest way to do this is to navigate to the ‘/sdk/extras/saurikit/cydia_substrate/’ directory and copy ‘substrate.h’ and navigate to the ‘/sdk/extras/saurikit/cydia_substrate/lib//’ directory and copy ‘libsubstrate-dvm.so’ file into the jni folder of the project. Next, we need to include the Substrate libraries. cpp: This file will contain the code for the Substrate hookĪndroid.mk: This is a Makefile file which contains make commands used to build our hook Once you click Finish, the ADT plugin will process the provided information and generate a new directory ‘jni’ under the project directory and create following two new files – However, it is a good practice to append suffix ‘.cy’ to help one identify it is a Cydia extension. You can specify whatever name that pleases you. Once you click the menu item, Eclipse will show you a dialog box and will ask you for the name of your library. In order to add NDK/JNI support, Right Click on project, navigate to the ‘Android Tools’ context menu, and click ‘Add Native Support…’. This will allow us to use NDK functions to interact with the Android system and applications. ![]() Next, we will need to add support for NDK/JNI to our project. ![]() Navigate to the ‘Preferences’ menu item, expand ‘Android’ preferences, select ‘NDK’ preferences, and set NDK path Navigate to the ‘Preferences’ menu item, select ‘Android’ preferences, and set SDK path.Once the plugin has been installed successfully, ensure that SDK and NDK paths have been properly set in Eclipse Properties. If an entry for ‘Android Native Development Tools’ is missing then we are missing NDK support and NDK support can be installed from the ADT Plugin Update Site. To ensure that we have NDK support available, we will navigate to the ‘About Eclipse’ menu item, click the ‘Installation Details’ button and check for ‘Android Native Development Tools’ under ‘Installed Software’. ![]() You can also read the following documentation on how to download the Mobile Substrate APIs here: Preparing NDK/JNI SupportĪfter following steps “Setting Up the IDE” and “Adding Permissions to AndroidManifest.xml” from Part 1 of our tutorial, we need to make sure that we have installed and enabled NDK support for the ADT plugin and that the environment variables are set properly. In case you haven’t done so yet, you can download the Mobile Substrate APK here: Note: This guide assumes you have a rooted device, have already installed Mobile Substrate onto the device, and have already downloaded the Mobile Substrate API. The focus of this post will be hooking into private functions of a class, accessing and modifying the function parameters, and viewing and modifying the function’s return values. This application will perform various mathematical operations within private functions and display the results to the user. The application we will be using in this demonstration is a demo application called SuperMath and can be downloaded here. This post will discuss an option for hooking non-public methods by utilizing Mobile Substrate from NDK code. Then you come to the realization that your hook can’t access non-public methods. One day, you decide to put on the security ninja gloves, open your laptop, plug your android phone and take apart your dear Android application using Part 1 of our tutorial on Android Hooking using Mobile Substrate and you realize there is something wrong – something is not working. ![]()
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