Android Question How to create directory and read and write files in File.DirRootExternal?

[KIM jihoon]

sdk version 30
File.MakeDir(File.DirRootExternal, "TestFolder")

How is this code executed?
If run succeeds, "TestFolder" will be created
Someone please help. . .

 

[DonManfred]

How is this code executed?

you can´t. You do not have access to this folder with higher androids.

android.jar / targetSdkVersion / minSdkVersion

There are several versioned components that affect the compilation process and the runtime behavior of our apps. The purpose of this tutorial is to explain the differences between them and help you choose which version to use. Each Android version is mapped to an api level. You can see this...

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ExternalStorage - Access SD cards and USB sticks

Before we start: External storage means a real sd card or a connected mass storage USB device. This class can also be used to access the secondary storage (File.DirRootExternal). This becomes relevant with newer versions of Android that restrict direct access. It has nothing to do with runtime...

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[KIM jihoon]

? DonManfred thanks for the help.

If the user deletes the app and reinstalls it, the data stored (DirDefaultExternal) is deleted.
How is the data not deleted?

 

[agraham]

SaveAs - Let the user select a target folder + list of other related methods

B4A + B4i example: https://www.b4x.com/android/forum/threads/b4x-texteditor-save-and-load-external-files.132731/#post-838166 List of classes or libraries that can be used to access secondary storages: ContentChooser (Phone libray) - allows the user to select a resource or file using external...

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