Xamarin Android app storage

Question

First question, when an app is on a device, what is the max storage that it can take up. I have an app that writes a lot of files and at some point I can no longer save files to the device, but if I look on the device there is plenty of space available (3+ GB), so does Xamarin or Android tell the app you only have x amount of space to store data? What is x and is it configurable? Second question, how can I programmatically determine in my app how much of that space is available to let the user know what is free and how close they are to the max? Thanks!

Answer 1

There are minimum sizes of the data partition defined by Google:

Device implementations MUST have at least 512MB of non-volatile storage available for user data. That is, the /data partition MUST be at least 512MB.

For API details see this SO: https://stackoverflow.com/a/9198511/4984832

OEMs apply what the maximum of the data partition and you can use StatFs to see what is currently available at runtime:

using (var dataPath = Android.OS.Environment.DataDirectory)
using (var stat = new StatFs(dataPath.AbsolutePath))
{
    Log.Debug(TAG, $" Bytes: {stat.TotalBytes} : {stat.AvailableBytes}");
    Log.Debug(TAG, $"Blocks: {stat.BlockCountLong} : {stat.AvailableBlocksLong}");
}

Example output:

[SushiDrive]  Bytes: 2080194560 : 1900834816
[SushiDrive] Blocks: 507860 : 464071

Re: https://developer.android.com/reference/android/os/StatFs.html