Importing photos from the Android photo gallery

Now that we have created an implementation for iOS, we will do the same for Android:

1. Create a new interface named PhotoImporter in the GalleryApp.Android project.
2. Import all the members from the IPhotoImporter interface.
3. Resolve all the references.
4. Create a new method named ContinueWithPermission, which we will call when we get permission from the user to get photos from the photo gallery.
5. Use ContentResolver to get the photos (as in the following code block).
6. Loop through the result and add it to a class-level field with a string[] type named result:

public class PhotoImporter : IPhotoImporter
{
    private bool hasCheckedPermission;
    private string[] result;

    public bool ContinueWithPermission(bool granted)
    {
        if (!granted)
        {
            return false;
        }

        Android.Net.Uri imageUri = 
         MediaStore.Images.Media.ExternalContentUri;
        var cursor = 
 ...