Android JInputStream wrapper?

[TurboMagic 92]

Hello,

 

since Android 10 we've got this nasty problem of no longer having direct file access

to such folders like TPath.GetSharedDownloadsDir.

 

Now I have managed via some intent call to either ACTION_OPEN_DOCUMENT or ACTION_GET_CONTENT
to display some file chooser and when the user selects one I get the Uri of the selected file.

With that I can get at an JInputStream and could read out the individual bytes of that stream.

 

But: how to get at the file size properly to know when to stop reading?

The Available method should, as per Android's documentation

https://developer.android.com/reference/java/io/InputStream#available() rather not be used.

Is there any "wraper" available which properly/nicely wrapt this in a TFileStream or something similar?

A quick search didn't turn up anything yet.

TurboMagic

[Remy Lebeau 1396]

3 hours ago, TurboMagic said:

With that I can get at an JInputStream and could read out the individual bytes of that stream.

 

But: how to get at the file size properly to know when to stop reading?

You don't need to know the file size for that.  Simply stop reading when the stream's various read() methods return -1 indicating EOF has been reached.

 

But, if you absolutely did need to know a file's size, then use the provided Uri to open a JFile to the file, and then you can call its length() method.  You can create a JInputStream for a JFile using Android's FileInputStream class.

Edited January 28, 2021 by Remy Lebeau