protected bool ChooseFile(IValueCallback filePathCallback, Intent intent, string title)
{
if (_activity == null)
{
return(false);
}
Action <Result, Intent> callback = (resultCode, intentData) =>
{
if (filePathCallback == null)
{
return;
}
Java.Lang.Object result = ParseResult(resultCode, intentData);
filePathCallback.OnReceiveValue(result);
};
_requestCodes = _requestCodes ?? new List <int>();
int newRequestCode = ActivityResultCallbackRegistry.RegisterActivityResultCallback(callback);
_requestCodes.Add(newRequestCode);
_activity.StartActivityForResult(Intent.CreateChooser(intent, title), newRequestCode);
return(true);
}
public void UnregisterCallbacks()
{
if (_requestCodes == null || _requestCodes.Count == 0 || _activity == null)
{
return;
}
foreach (int requestCode in _requestCodes)
{
ActivityResultCallbackRegistry.UnregisterActivityResultCallback(requestCode);
}
_requestCodes = null;
}
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
ActivityResultCallbackRegistry.InvokeCallback(requestCode, resultCode, data);
}