I have created one activity and 2 fragments. Fragment B is inside Fragment A. When I click on back button on my phone it doesn't go to Fragment A from Fragment B. But it crashes the app. I am maintaining a Stack.
public void ShowFragment(SupportFragment fragment)
if (fragment.IsVisible)
return;
Android.Support.V4.App.FragmentTransaction trans = SupportFragmentManager.BeginTransaction();
fragment.View.BringToFront();
trans.Hide(mCurrentFragment);
Console.WriteLine("Hiding fragemnt current " + mCurrentFragment.Tag+" fragment "+fragment.Tag);
trans.Show(fragment);
if (mStackFragments.Count != 0)
SupportFragment sf = mStackFragments.Pop();
if (fragment != sf)
mStackFragments.Push(sf);
mStackFragments.Push(fragment);
mStackFragments.Push(sf);
mStackFragments.Push(fragment);
mCurrentFragment = fragment;
trans.Commit();
LoadFragmentTitleTxtView();
LoadActionBarSpinner();
above method is used to show the fragment/main screen, whereas the following code is for OnBackPressed.
public override void OnBackPressed()
if (mDrawerLayout.IsDrawerOpen((int)GravityFlags.Left))
mDrawerLayout.CloseDrawer((int)GravityFlags.Left);
if (mStackFragments.Count > 1)
//mStackFragments.Pop();
Console.WriteLine("Popping 1st " + mStackFragments.Pop().Tag+" Count "+mStackFragments.Count);
SupportFragment frag = mStackFragments.Pop();
Console.WriteLine("Poppoing 2nd " + frag.Tag+" Count "+mStackFragments.Count);
if (frag == chaptersFragment)
if (chapterfiltertext != "")
item.ExpandActionView();
sssearchview.SetQuery(chapterfiltertext, false);
mainview.Animate().Alpha(1f).SetListener(null);
Console.WriteLine("In back method.. "+frag.Tag);
ShowFragment(frag);
Finish();
its working fine for the fragments which doesn't have any nested fragments within them.
This is the code for the nested fragment B to load it on main screen from fragment A.
FragmentTransaction tx = context.SupportFragmentManager.BeginTransaction();
FragmentB fragmentB = new FragmentB();
Bundle args = new Bundle();
args.PutString("letter", tmp1);
fragmentB.Arguments = args;
tx.Replace(Resource.Id.main, fragmentB, "innerDictFrag");
tx.AddToBackStack(null);
context.mStackFragments.Push(fragmentB);
tx.Commit();
Hello,
Welcome to our Microsoft Q&A platform!
If you want to transfer fragment1 to fragment2, please use the following code, do not change code order. For example, current is fragment1, then I navigate to fragment2
public class Fragment1 : Fragment
public override void OnCreate(Bundle savedInstanceState)
base.OnCreate(savedInstanceState);
// Create your fragment here
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view= inflater.Inflate(Resource.Layout.layout1, container, false);
Button button1 = view.FindViewById<Button>(Resource.Id.button1);
button1.Click += Button1_Click;
return view;
private void Button1_Click(object sender, EventArgs e)
FragmentTransaction transaction = this.FragmentManager.BeginTransaction();
Fragment2 fragment = new Fragment2();
transaction.AddToBackStack(null);
transaction.Replace(Resource.Id.FramePage, fragment);
transaction.Commit();
In the fragment2, you can click the back button to back the fragment1, or click button execute this.FragmentManager.PopBackStack();
public class Fragment2 : Fragment
public override void OnCreate(Bundle savedInstanceState)
base.OnCreate(savedInstanceState);
// Create your fragment here
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view= inflater.Inflate(Resource.Layout.layout2, container, false);
Button popBtn = view.FindViewById<Button>(Resource.Id.popBtn);
popBtn.Click += PopBtn_Click;
return view;
private void PopBtn_Click(object sender, EventArgs e)
this.FragmentManager.PopBackStack();
Best Regards,
Leon Lu
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