Simple login form in Java only. It will call native method for login check
This project is for experienced modders and programmers only and must be able to search on Google for help. We will not explain here
Keep in mind that it is mainly for APK modding and not for general app development purposes
Add login.php to your server that supports PHP. Repo based hosting such as Github does not support PHP
Change URL on public static String URL on LoginForm.java file
Build the project to APK file.
Build -> Build Bundle(s)/APK(s) -> Build APK(s)
If no errors occured, you did everything right and build will succeded. You will be notified that it build successfully
Click on locate to show you the location of build.apk. It is stored at (your-project)\app\build\outputs\apk\app-debug.apk
Now decompile your app-debug.apk.
Copy all your smali folders to the game's smali folder to the game's decompiled directory (game name)\smali. If the game have multidexes, add your smali to the last classes dex if possible to prevent compilation errors such as Unsigned short value out of range: xxxxx
Now, you must know the game's launch activity/main activity
You can either use APK Easy Tool to view main activity like screenshot below:
Or decompile your game APK using apktool.jar, or any 3rd party CLI or GUI tools, and open androidmanifest.xml and search after <action android:name="android.intent.action.MAIN"/>
In this case, my game's main activity was com.unity3d.player.UnityPlayerActivity
On the game's androidmanifest.xml, besure that <uses-permission android:name="android.permission.INTERNET"/> exist
Locate to the game's path of main activity and open the smali file.
Example if it was com.unity3d.player.UnityPlayerActivity, the path would be (decompiled game)/com/unity3d/player/UnityPlayerActivity.smali
If the game have multi dexes, it may be located in smali_classes2... please check all
Open the main acitivity's smali file, search for OnCreate method and paste this code inside (change the package name if you had changed it)
invoke-static {p0}, Lcom/example/androidloginjava/LoginForm;->Start(Landroid/content/Context;)V
Save the file
Now compile the game APK
It should launch the login screen and successfully launch the activity after login :)
See native-lib.cpp for example how to check if the user has logged in
There are the codes called Check() and System.loadLibrary("yourlib");. They are commented out
You may need to protect your dex and lib files for that