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Conceptually, internal storage and external storage are very similar — they are both places at which a Xamarin. Android app may save files. This similarity may be confusing for developers who are not familiar with Android as it is not clear when an app should use internal storage vs external storage.

Internal storage refers to the non-volatile memory that Android allocates to the operating system, APKs, and for individual apps. This space is not accessible except by the operating system or apps. Android will allocate a directory in the internal storage partition for each app. When the app is uninstalled, all the files that are kept on internal storage in that directory will also be deleted.

Internal storage is best suited for files that are only accessible to the app and that will not be shared with other apps or will have very little value once the app is uninstalled. On Android 6. Internal storage has the following disadvantages:. External storage refers to file storage that is not internal storage and not exclusively accessible to an app. The primary purpose of external storage is to provide a place to put files that are meant to be shared between apps or that are too large to fit on the internal storage.

The advantage of external storage is that it typically has much more space for files than internal storage. However, external storage is not always guaranteed to be present on a device and may require special permission from the user to access it. For devices that support multiple users, Android will provide each user their own directory on both internal and external storage.

This directory is inaccessible to other users on the device. This separation is invisible to apps as long as they do not hardcode paths to files on internal or external storage. As a rule of thumb, Xamarin. Android apps should prefer saving their files on internal storage when it is reasonable, and rely on external storage when files need to be shared with other apps, are very large, or should be retained even if the app is uninstalled. For example, a configuration file is best suited for a internal storage as it has no importance except to the app that creates it.

In contrast, photos are a good candidate for external storage. They can be very large and in many cases the user may want to share them or access them even if the app is uninstalled. This guide will focus on internal storage. Please see the guide External storage for details on using external storage in a Xamarin.

Android application. The internal storage directory for an application is determined by the operating system, and is exposed to Android apps by the Android. FilesDir property. This will return a Java. File object representing the directory that Android has dedicated exclusively for the app. For example, an app with the package name com. The exact path to the internal storage directory can vary from device to device and between versions of Android.

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