public static void SetContentView([NotNull] this ViewGroup frameLayout, object content,
FragmentTransaction transaction = null, Action <ViewGroup, Fragment, FragmentTransaction> updateAction = null)
{
Should.NotBeNull(frameLayout, "frameLayout");
if (content == null)
{
bool hasFragment = false;
var fragmentManager = frameLayout.GetFragmentManager();
if (fragmentManager != null)
{
var fragment = fragmentManager.FindFragmentById(frameLayout.Id);
hasFragment = fragment != null;
if (hasFragment && !fragmentManager.IsDestroyed)
{
fragmentManager.BeginTransaction().Remove(fragment).CommitAllowingStateLoss();
fragmentManager.ExecutePendingTransactions();
}
}
if (!hasFragment)
{
frameLayout.RemoveAllViews();
}
return;
}
var view = content as View;
if (view == null)
{
var fragment = (Fragment)content;
ValidateViewIdFragment(frameLayout, fragment);
var addToBackStack = PlatformDataBindingModule.AddToBackStackMember.GetValue(frameLayout, null);
FragmentManager manager = null;
if (transaction == null)
{
manager = frameLayout.GetFragmentManager();
if (manager == null)
{
return;
}
transaction = manager.BeginTransaction();
}
if (addToBackStack && fragment.Arguments != null)
{
addToBackStack = !fragment.Arguments.GetBoolean(AddedToBackStackKey);
}
if (updateAction == null)
{
if (fragment.IsDetached)
{
transaction.Attach(fragment);
}
else
{
if (addToBackStack)
{
if (fragment.Arguments == null)
{
fragment.Arguments = new Bundle();
}
fragment.Arguments.PutBoolean(AddedToBackStackKey, true);
}
transaction.Replace(frameLayout.Id, fragment);
}
}
else
{
updateAction(frameLayout, fragment, transaction);
}
if (addToBackStack)
{
transaction.AddToBackStack(null);
}
if (manager != null)
{
transaction.Commit();
manager.ExecutePendingTransactions();
}
}
else
{
if (frameLayout.ChildCount == 1 && frameLayout.GetChildAt(0) == view)
{
return;
}
frameLayout.RemoveAllViews();
frameLayout.AddView(view);
}
}