Android get free size of internal/external memory

Question

I want to get the size of free memory on internal/external storage of my device programmatically. I\'m using this piece of code :

StatFs stat = new StatFs(En         


        

Answer 1

To get all available storage folders (including SD cards), you first get the storage files:

File internalStorageFile=getFilesDir();
File[] externalStorageFiles=ContextCompat.getExternalFilesDirs(this,null);

Then you can get the available size of each of those.

There are 3 ways to do it:

API 8 and below:

StatFs stat=new StatFs(file.getPath());
long availableSizeInBytes=stat.getBlockSize()*stat.getAvailableBlocks();

API 9 and above:

long availableSizeInBytes=file.getFreeSpace();

API 18 and above (not needed if previous one is ok) :

long availableSizeInBytes=new StatFs(file.getPath()).getAvailableBytes(); 

To get a nice formatted string of what you got now, you can use:

String formattedResult=android.text.format.Formatter.formatShortFileSize(this,availableSizeInBytes);

or you can use this in case you wish to see exact bytes number but nicely:

NumberFormat.getInstance().format(availableSizeInBytes);

Do note that I think the internal storage could be the same as the first external storage, since the first one is the emulated one.

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EDIT: Using StorageVolume on Android Q and above, I think it's possible to get the free space of each, using something like:

    val storageManager = getSystemService(Context.STORAGE_SERVICE) as StorageManager
    val storageVolumes = storageManager.storageVolumes
    AsyncTask.execute {
        for (storageVolume in storageVolumes) {
            val uuid: UUID = storageVolume.uuid?.let { UUID.fromString(it) } ?: StorageManager.UUID_DEFAULT
            val allocatableBytes = storageManager.getAllocatableBytes(uuid)
            Log.d("AppLog", "allocatableBytes:${android.text.format.Formatter.formatShortFileSize(this,allocatableBytes)}")
        }
    }

I'm not sure if this is correct, and I can't find a way to get the total size of each, so I wrote about it here, and asked about it here.