Nagdroid - For ethical and conscientious Android crackers

Nagdroid is an add-on nagware for those Android app pirates who still have sympathy for the app developers.
It functions similarly to nagware in WinRAR, displaying a pop-up every time the app is opened after 30 days, with the hope that the user feels annoyed and eventually intends to purchase the app.

Installation (AndroidManifest Method)

TODO

Installation (DEX Method)

Make sure you have a basic understanding of reverse engineering and Smali. You can read this documentation to learn about Smali.

1. You need to decompile the target APK using apktool or a similar tool. Then, locate the smali file that serves as the main activity of the APK (refer to the activity in AndroidManifest.xml with the android.intent.action.MAIN action).
2. After you've found the smali file, add this code inside the onCreate method (replace the A with the register):

new-instance vA, Lid/aozora/nagdroid/Nagdroid;
invoke-direct {vA, p0}, Lid/aozora/nagdroid/Nagdroid;-><init>(Landroid/content/Context;)V
invoke-virtual {vA}, Lid/aozora/nagdroid/Nagdroid;->show()Landroid/app/AlertDialog;
move-result-object vA

3. Download the latest classes.dex, and then decompile it using baksmali.
4. Move all the contents of its output (usually inside the out folder) into the smali folder of the decompiled APK folder earlier.
5. Rebuild the APK using apktool and then sign it using jarsigner (using debug keystore is recommended).

Documentation

• showAppIcon(Z)Lid/aozora/nagdroid/Nagdroid; - Display the app icon within the dialog. 0x0 (default) will not displaying the app icon, 0x1 will displaying the app icon.
• showAppName(Z)Lid/aozora/nagdroid/Nagdroid; - Display the app label within the dialog. 0x0 will not displaying the app label. 0x1 (default) will displaying the app label.
• forceMessageLang(Ljava/lang/String;)Lid/aozora/nagdroid/Nagdroid; - Force the dialog to use message from the specific language. Only accept ISO-639 format. If the language is not available, the dialog will use English instead.
• show()Landroid/app/AlertDialog; - Show the dialog if the time has comes.

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.