Menu
I just implemented a bottom navigation (AS's default - File -> New -> Activity -> Bottom Navigation Activity) Everything is fine except for a space on the top of the nav_host_fragment.
Since it was generated in a ConstraintLayout, I tried to clean the constraints and set the top constraint with parent, setting margin to '0dp' and set height to match_constraint.
I unsuccessfully deleted the constraints and tried over and over again.
I used Clean Project.
I changed to RelativeLayout and set arguments like this:
<fragment android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_above="@+id/nav_view" app:defaultNavHost="true" app:navGraph="@navigation/mobile_navigation" /> But the space between nav_host_fragment and the top is still there.
Here's the lyout file:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingTop="?attr/actionBarSize"> <com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/nav_view" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:background="?android:attr/windowBackground" app:menu="@menu/bottom_nav_menu" /> <fragment android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_above="@+id/nav_view" app:defaultNavHost="true" app:navGraph="@navigation/mobile_navigation" /> </RelativeLayout> 
590
Calling addToBackStack() commits the transaction to the back stack. The user can later reverse the transaction and bring back the previous fragment by pressing the Back button. If you added or removed multiple fragments within a single transaction, all of those operations are undone when the back stack is popped.
FragmentManager which is used to create transactions for adding, removing or replacing fragments. fragmentManager. beginTransaction(); Start a series of edit operations on the Fragments associated with this FragmentManager. The FragmentTransaction object which will be used.
popUpTo and popUpToInclusive For example, if your app has an initial login flow, once a user has logged in, you should pop all of the login-related destinations off of the back stack so that the Back button doesn't take users back into the login flow.
Remove this line from your Relative Layout.
android:paddingTop="?attr/actionBarSize" Answer from @Mike
That looks like the android:paddingTop="?attr/actionBarSize" on the
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" > <com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/nav_view" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:background="?android:attr/windowBackground" app:menu="@menu/bottom_nav_menu" /> <fragment android:id="@+id/nav_host_fragment" android:name="androidx.navigation.fragment.NavHostFragment" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_above="@+id/nav_view" app:defaultNavHost="true" app:navGraph="@navigation/mobile_navigation" /> </RelativeLayout> If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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