private async Task <StorageFile?> PickSaveFileTaskAsync(CancellationToken token)
{
if (!(ContextHelper.Current is Activity appActivity))
{
throw new InvalidOperationException("Application activity is not yet set, API called too early.");
}
var action = Intent.ActionCreateDocument;
var intent = new Intent(action);
intent.SetType("*/*");
intent.AddCategory(Intent.CategoryOpenable);
var mimeTypes = GetMimeTypes();
this.ParseMimeTypeForXml(mimeTypes);
foreach (var mime in mimeTypes)
{
intent.PutExtra(Intent.ExtraMimeTypes, mime);
}
if (!string.IsNullOrEmpty(SuggestedFileName))
{
intent.PutExtra(Intent.ExtraTitle, SuggestedFileName);
}
var activity = await AwaitableResultActivity.StartAsync();
var result = await activity.StartActivityForResultAsync(intent, cacellationToken : token);
var resultIntent = result?.Intent;
if (resultIntent?.Data != null)
{
return(StorageFile.GetFromSafUri(resultIntent.Data));
}
else if (resultIntent?.ClipData != null && resultIntent.ClipData.ItemCount > 0)
{
for (int itemIndex = 0; itemIndex < resultIntent.ClipData.ItemCount; itemIndex++)
{
var uri = resultIntent.ClipData.GetItemAt(itemIndex)?.Uri;
if (uri != null)
{
return(StorageFile.GetFromSafUri(uri));
}
}
}
return(null);
}
private static async Task <ComponentName> ResolveEmailComponent()
{
var packageManager = Application.Context.PackageManager;
var emailDummyIntent = new Intent(Intent.ActionSendto);
emailDummyIntent.SetData(Android.Net.Uri.Parse("mailto:[email protected]"));
var emailActivities = packageManager.QueryIntentActivities(emailDummyIntent, 0);
if (emailActivities == null)
{
return(null);
}
if (emailActivities.Count == 1)
{
return(GetComponentName(emailActivities[0]));
}
var defaultHandler = emailActivities.FirstOrDefault(e => e.IsDefault);
if (defaultHandler != null)
{
return(GetComponentName(defaultHandler));
}
var intentPick = new Intent();
intentPick.SetAction(Intent.ActionPickActivity);
intentPick.PutExtra(Intent.ExtraIntent, emailDummyIntent);
var awaitableResultActivity = await AwaitableResultActivity.StartAsync();
var result = await awaitableResultActivity.StartActivityForResultAsync(intentPick, HandlerPickerResultCode);
if (result.Result == Result.Ok)
{
return(result.Intent.Component);
}
return(null);
}
