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问题:
I can't hide my FloatingActionButton. Here is my code:
XML:
<CoordinatorLayout> <AppBarLayout android:id="@+id/appbar"> <CollapsingToolbarLayout> <ImageView/> <android.support.v7.widget.Toolbar /> </CollapsingToolbarLayout> </AppBarLayout> <NestedScrollView /> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" app:layout_anchor="@id/appbar" app:layout_anchorGravity="bottom|right|end"/> </CoordinatorLayout>
And I'm calling:
fab.clearAnimation(); fab.setVisibility(View.GONE);
I'm trying to hide the FAB, but it seems that setVisibility + clearAnimation does not work if the FAB is in a CoordinatorLayout.
Even if I call fab.clearAnimation, the animation is still triggered. Can anyone help me?
回答1:
If your issue is the animation, you could try invalidating the FAB Behavior. As for the visibility, you should null the anchor you have set in your layout:
CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams(); p.setBehavior(null); //should disable default animations p.setAnchorId(View.NO_ID); //should let you set visibility fab.setLayoutParams(p); fab.setVisibility(View.GONE); // View.INVISIBLE might also be worth trying //to bring things back to normal state CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams(); p.setBehavior(new FloatingActionButton.Behavior()); p.setAnchorId(R.id.appbar); fab.setLayoutParams(p);
回答2:
I ran into exactly the same issue. It would seem that Google's Android team doesn't want you to have control of the visibility when the FloatingActionButton is anchored to an AppBarLayout, as discussed in this issue - FloatingActionButton Ignores View Visibility
It looks like a viable fix is wrapping the FAB in a FrameLayout and setting the visibility on the wrapper instead, like this:
<android.support.design.widget.FrameLayout android:id="@+id/fab_container" android:layout_height="wrap_content" android:layout_width="wrap_content" android:visibility="invisible"> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/fab_icon"/> </android.support.design.widget.FrameLayout>
You may however wish to consider whether this is the ideal behaviour. Google advocates recommend that the FAB be visible as soon as the screen is created. If you're hiding it for longer than required to animate it in, consider showing a disabled state instead.
