Feature/database file export

[EcZww]

4.2.1.beta

Support exporting files to a specified directory #37

• For Android API Level < 28
  • Export Directory : Downloads/AWARE
  • Method: Uses Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) to access the common Downloads directory, ensuring easy user access and compatibility with multiple file manager apps.
  • Devices running Android versions before API Level 28 do not enforce Scoped Storage, allowing apps to freely write to shared storage directories after obtaining the necessary permissions.
• For Android API Level >= 28
  • Export Directory: User decide
  • For devices on Android API Level 28 and above, the implementation ensures compatibility with Android’s Scoped Storage model introduced in Android 10 (API Level 29). This model limits access to external storage to protect user privacy and system integrity.
  • Scoped Storage Compliance: Utilizes the Storage Access Framework (SAF) for API levels where Scoped Storage is enforced. This allows users to select directories via a system file picker, granting the app temporary access to the chosen location.

[tinazhang128]

LGTM