A savegame editor and APK injection tool for Merge Dragons.

• SaveGameEditor: Python tool to analyze and edit Merge Dragons savegame databases
• APKInjection: Injects code into Merge Dragons APK to enable savegame export/import

• SQLite database analysis
• JSON mapping for data transformation
• Configurable data display

• Automated Java compilation and DEX creation
• APK decompilation/recompilation
• Permission patching
• Code injection into UnityPlayerActivity
• Automatic APK signing

MergeDragons-Save-Editor/
├── APKInjection/
│   ├── inject.py          # Main injection script
│   ├── Injector.java      # Java injector source
│   ├── tools/             # Android development tools
│   └── mergedragons.exe   # APK extraction tool
├── SaveGameEditor/
│   ├── editor.py          # Main editor script
│   ├── mapping.json       # Data mapping config
│   └── md_db.db          # Sample database
└── LICENSE

• Python 3.6+
• sqlite3, json (standard libraries)

• Java 8+ JDK
• Python 3.6+
• Windows (for .exe/.bat files)

cd SaveGameEditor
python editor.py md_db.db mapping.json

cd APKInjection
python inject.py

Process: APK extraction → Java compilation → DEX creation → APK manipulation → Code injection → Signing

Result: mergedragons_injected.apk with savegame export/import functionality

The injected code (Injector.java):

1. Shows toast notification on startup
2. Checks storage permissions
3. Exports savegame to /sdcard/MergeDragons/md_db_[timestamp].db
4. Imports from /sdcard/MergeDragons/md_db_import.db if present
5. Restarts app after import

mapping.json defines how internal data structures are displayed:

{
  "file_map": {
    "_playerData": "Player Data",
    "_homeStats": "Camp Stats"
  },
  "data_map": {
    "Player Data": {
      "0": "Gems",
      "1": "Dragon Eggs"
    }
  }
}

• For private use only
• Create backups before use
• Requires access to private app data
• Tested on Android 8+ (API 21+)

MIT License - see LICENSE file.

Use at your own risk. Author is not responsible for data loss or damage.

Contributions welcome! Open issues or pull requests for improvements.