Fix 1053: Storage location not created and setting not honored

[KOISHI-CHEN]

Description

Please include a summary of the change and which issue is fixed. List any dependencies that are required for this change. If there are any UI change, please include the screenshots also.

• let defaultstorage path will be created with the mainActivity start
• create a unified entrance to get the default path
• let user can modify the storage path (use the original code,I why don't why it is commented out). I test it on api 26 and api 30 ,it works well.

Fixes #1053

Type of change

Just put an x in the [] which are valid.

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

• [ ] ./gradlew assembleDebug assembleRelease
• [x] ./gradlew checkstyle

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

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