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Prevent Fragment Added Exception #243

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Prevent Fragment Added Exception #243

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12 changes: 12 additions & 0 deletions MvvmCross.Droid.Support.V4/MvxCachingFragmentActivity.cs
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Expand Up @@ -32,6 +32,7 @@ public class MvxCachingFragmentActivity : MvxFragmentActivity, IFragmentCacheabl
public const string ViewModelRequestBundleKey = "__mvxViewModelRequest";
private const string SavedFragmentTypesKey = "__mvxSavedFragmentTypes";
private IFragmentCacheConfiguration _fragmentCacheConfiguration;
private string _firstFragmentTag;

protected enum FragmentReplaceMode
{
Expand Down Expand Up @@ -241,6 +242,17 @@ protected virtual void ShowFragment(string tag, int contentId, Bundle bundle, bo
cache.GetAndClear(fragInfo.ViewModelType, GetTagFromFragment(fragInfo.CachedFragment as Fragment));
}

// Prevent to add the "same first" fragment twice
if (fragInfo.Tag == _firstFragmentTag)
{
SupportFragmentManager.PopBackStack(null, (int)PopBackStackFlags.Inclusive);
}

if (string.IsNullOrEmpty(_firstFragmentTag))
{
_firstFragmentTag = fragInfo.Tag;
}

if ((currentFragment != null && fragInfo.AddToBackStack) || forceAddToBackStack)
{
ft.AddToBackStack(fragInfo.Tag);
Expand Down