How to Request manage_external_storage Permission in Xamarin.Android

Question

Hello Everyone :)
Please I am looking for a way to request (Manage_External_Storage) Permission in Xamarin.Android because i need this permission in my app after android 11
I did not find it in Xamarin.Essentials.
thanks in advance :)

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

From Android Docs https://developer.android.com/training/data-storage/manage-all-files#all-files-access

An app can request All files access from the user by doing the following:

Declare the MANAGE_EXTERNAL_STORAGE permission in the manifest.

Use the ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION intent action to direct users to a system settings page where they can enable the following option for your app: Allow access to manage all files.

We can judge current version then use Snackbar to guide the users to open the system page to grand the MANAGE_EXTERNAL_STORAGE permission.

Firstly, use following code to judge current version and pop a Snackbar in OnCreate method of MainActivity.

   public class MainActivity : AppCompatActivity  
       {  
           protected override void OnCreate(Bundle savedInstanceState)  
           {  
               base.OnCreate(savedInstanceState);  
               Xamarin.Essentials.Platform.Init(this, savedInstanceState);  
               // Set our view from the "main" layout resource  
               SetContentView(Resource.Layout.activity_main);  


               if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.R)  
               {  
                   if (!Environment.IsExternalStorageManager)  
                   {  
                       Snackbar.Make(FindViewById(Android.Resource.Id.Content), "Permission needed!", Snackbar.LengthIndefinite)  
                               .SetAction("Settings", new MyClickHandler(this)).Show();  
                   }  

               }  
   }  

Then achieve the MyClickHandler( execute ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION intent action to direct users to a system settings page) to grand the Manage_External_Storage permission.

   internal class MyClickHandler:Java.Lang.Object ,View.IOnClickListener  
       {  
           private MainActivity mainActivity;  

           public MyClickHandler()  
           {  
           }  

           public MyClickHandler(MainActivity mainActivity)  
           {  
               this.mainActivity = mainActivity;  
           }  

           public void OnClick(View v)  
           {  
               try  
               {  

                   Uri uri = Uri.Parse("package:" + Application.Context.ApplicationInfo.PackageName);  
                   Intent intent = new Intent(Android.Provider.Settings.ActionManageAppAllFilesAccessPermission, uri);  
                   mainActivity.StartActivity(intent);  
               }  
               catch (Exception ex)  
               {  
                   Intent intent = new Intent();  
                   intent.SetAction(Android.Provider.Settings.ActionManageAppAllFilesAccessPermission);  
                   mainActivity.StartActivity(intent);  
               }  
           }  
       }  

And please do not forget to add MANAGE_EXTERNAL_STORAGE permission to your AndroidManifest.xml.

Best Regards,

Leon Lu

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