I have defined a basic Coordinator layout for my view:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabIndicatorColor="@color/white"
app:tabMode="fixed"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
There are multiple tabs in my view pager. I am posting one of my simple fragments:
<ListView
android:id="@+id/transferList"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="@dimen/activity_vertical_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:layout_alignParentRight="true"
android:src="@drawable/ic_add_white" />
What happens is that the FAB goes out of screen. It's just not the FAB, but other fragments with cardviews/listviews are getting cut off at the bottom of the screen. I looked around for a solution, and came up with a hacky solution: Removing the property app:layout_scrollFlags="scroll|enterAlways" from the Toolbar.
I can't understand what might be causing this to happen, and how removing the above solved the problem. Is it some bug in the support library? Is there a better way to solve this? Another solution I had come across is from here - to keep the FAB button directly under a Coordinator layout in the activity, and make it visible only in the fragment you need. Did not seem like a good solution to me. Also, other views in my fragments were also getting cut off.
I have fixed this problem by changing the Toolbar's app:layout_scrollFlags="scroll|enterAlways"
attribute to just app:layout_scrollFlags="enterAlways"
.
I have a layout similar to yours: activity with a toolbar going off the top and tabs. And the requirement for fragments is to have their own independent FABs.
I couldn't cope with it directly in the xml, so then I nailed it that way:
Activity layout
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_marginBottom="20dp"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabContentStart="72dp"
app:tabMode="scrollable" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
Fragment layout:
<FrameLayout 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:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="@+id/scroll"
layout="@layout/content_activity_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right|end"
android:src="@android:drawable/ic_input_add"
app:borderWidth="0dp"
app:fabSize="mini"
app:useCompatPadding="true" />
And a bit of code to make the FAB stay where it intended to be. Fragment onCreateView:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.fragment_tabs2, container, false);
final FloatingActionButton fab = (FloatingActionButton) rootView.findViewById(R.id.fab);
final TabLayout tabLayout = (TabLayout) getActivity().findViewById(R.id.tabs);
final AppBarLayout appBarLayout = (AppBarLayout) getActivity().findViewById(R.id.appbar);
appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
int maxAbsOffset = appBarLayout.getMeasuredHeight() - tabLayout.getMeasuredHeight();
fab.setTranslationY(-maxAbsOffset - verticalOffset);
}
});
return rootView;
}
This is because you are using CoordinatorLayout
with ListView
. You can change your implementation to RecyclerView
to achieve correct scroll.
check my answer here. This may help you.
There are 2 solutions to this problem:
scroll
from app:layout_scrollFlags
(e.g app:layout_scrollFlags="enterAlways"
) or remove entire app:layout_scrollFlags
scroll
attribute, the main layout content/fragment must use RecyclerView
or NestedScrollView
.https://code.luasoftware.com/tutorials/android/bottom-of-fragment-in-viewpager-out-of-screen/
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