/* Checks if external storage is available for read and write */
public bool IsExternalStorageWritable(File file)
{
var state = Environment.GetExternalStorageState(file);
if (Environment.MediaMounted.Equals(state))
{
return(true);
}
return(false);
}
internal static Java.IO.File GetTemporaryRootDirectory()
{
// If we specifically want the internal storage, no extra checks are needed, we have permission
if (TemporaryLocation == FileProviderLocation.Internal)
{
return(Platform.AppContext.CacheDir);
}
// If we explicitly want only external locations we need to do some permissions checking
var externalOnly = TemporaryLocation == FileProviderLocation.External;
// Check to see if we are >= API Level 19 (KitKat) since we don't need to declare the permission on these API levels to save to the external cache/storage
// If we're not on 19 or higher we do need to check for permissions, but if we aren't limiting to external only, don't throw an exception if the
// permission wasn't declared because we can always fall back to internal cache
var hasPermission = Platform.HasApiLevel(BuildVersionCodes.Kitkat);
if (!hasPermission)
{
hasPermission = Permissions.IsDeclaredInManifest(global::Android.Manifest.Permission.WriteExternalStorage);
if (!hasPermission && externalOnly)
{
throw new PermissionException("Cannot access external storage, the explicitly chosen FileProviderLocation.");
}
}
// make sure the external storage is available
var hasExternalMedia = Platform.HasApiLevel(BuildVersionCodes.Lollipop)
? AndroidEnvironment.GetExternalStorageState(Platform.AppContext.ExternalCacheDir) == AndroidEnvironment.MediaMounted
#pragma warning disable CS0618 // Type or member is obsolete
: AndroidEnvironment.GetStorageState(Platform.AppContext.ExternalCacheDir) == AndroidEnvironment.MediaMounted;
#pragma warning restore CS0618 // Type or member is obsolete
// undo all the work if we have requested a fail (mainly for testing)
if (AlwaysFailExternalMediaAccess)
{
hasExternalMedia = false;
}
// fail if we need the external storage, but there is none
if (externalOnly && !hasExternalMedia)
{
throw new InvalidOperationException("Unable to access the external storage, the media is not mounted.");
}
// based on permssions, return the correct directory
// if permission were required, then it would have already thrown
return(hasPermission && hasExternalMedia
? Platform.AppContext.ExternalCacheDir
: Platform.AppContext.CacheDir);
}
static bool IsMediaMounted(Java.IO.File location) => AndroidEnvironment.GetExternalStorageState(location) == AndroidEnvironment.MediaMounted;
static bool IsMediaMounted(Java.IO.File location) =>
Platform.HasApiLevel(BuildVersionCodes.Lollipop)
? AndroidEnvironment.GetExternalStorageState(location) == AndroidEnvironment.MediaMounted
#pragma warning disable CS0618 // Type or member is obsolete
: AndroidEnvironment.GetStorageState(location) == AndroidEnvironment.MediaMounted;
