Try to probably Toast the file. And try if you could edit your question to show how you are saving the file — Oluwatumbi. This answer is deprecated in API 29 — eri0o.
Here's how to do it in API stackoverflow. Show 4 more comments. Here is an example of how you can start a download: DownloadManager. Request uri ; request. For API 28, this solution worked: stackoverflow. Axel 3, 10 10 gold badges 34 34 silver badges 53 53 bronze badges.
Thiago Prochnow Thiago Prochnow 1 1 silver badge 4 4 bronze badges. What is context? Combine Android. AbsolutePath, Android. Create filePath ; streamWriter. Close ; File. FromContext Android. Context ; downloadManager. ReadAllBytes filePath.
Length, true ; Now your local file is "downloaded" to your Android device, the user gets a notification, and a reference to the file is being added to the downloads folder. This will be discussed in the next section. 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. Android app has obtained the full path to a file, it should utilize any of the standard. This maximizes the amount of cross platform compatible code for an app. However, before attempting to access a file a Xamarin. Android app must ensure that is it possible to access that file. The first step before writing to external storage is to check that it is readable or writeable.
The Android. ExternalStorageState property holds a string that identifies the state of the external storage. This property will return a string that represents the state. This table is a list of the ExternalStorageState values that might be returned by Environment.
ExternalStorageState :. Most Android apps will only need to check if external storage is mounted. The following code snippet shows how to verify that external storage is mounted for read-only access or read-write access:. Android considers accessing external storage to be a dangerous permission , which typically requires the user to grant their permission to access the resource.
The user may revoke this permission at any time. This means that a run time permission request should be performed prior to any file access. Apps are automatically granted permissions to read and write their own private files. It is possible for apps to read and write the private files that belong to other apps after being granted permission by the user. All Android apps must declare one of the two permissions for external storage in the AndroidManifest.
To identify the permissions, one of the following two uses-permission elements must be add to AndroidManifest. It is not necessary to request both permissions in AndroidManifest.
The permissions may also be added using the Android Manifest tab of the solution properties :. The permissions may also be added using the Android Manifest tab of the solution properties pad :. Generally speaking, all dangerous permissions must be approved by the user. The permissions for external storage are an anomaly in that there are exceptions to this rule, depending on the version of Android that the app is running:.
For more information on performing runtime permission requests, please consult the guide Permissions In Xamarin. The monodroid-sample LocalFiles also demonstrates one way of performing runtime permission checks. It is similar to UWP with slight changes.
Forms allows developers to define behavior in platform-specific projects. DependencyService then finds the right platform implementation, allowing shared code to access the native functionality.
To know more about DependencyService Click Here. I have explained the method to create DependencyService with the steps as shown in the following.
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