FloatingActionButton doesn't hide

问题:

I am trying to hide my FloatingActionButton fabLocation programmatically with :

fabLocation.setVisibility(View.GONE)

but it does not work.

If I add android:visibility="gone" in my XML layout, fabLocation is hidden when I run my activity but it reappears when I scroll.

Here is my layout:

<?xml version="1.0" encoding="utf-8"?>
<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.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        app:contentScrim="@color/colorOverlay"
        app:expandedTitleMarginEnd="64dp"
        app:expandedTitleMarginStart="48dp"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">

        <ImageView
            android:id="@+id/img_couverture"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            android:scaleType="centerCrop"
            android:src="@drawable/bg_navigation_drawer_header"
            app:layout_collapseMode="parallax" />

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:layout_collapseMode="pin"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

    </android.support.design.widget.CollapsingToolbarLayout>

</android.support.design.widget.AppBarLayout>

<android.support.v4.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <android.support.v7.widget.CardView
            android:layout_marginTop="8dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:padding="16dp">

                <TextView
                    android:id="@+id/tv_name"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:textSize="18sp" />

                <View
                    android:background="@drawable/separator_orange_gradient"
                    android:layout_marginTop="8dp"
                    android:layout_marginBottom="16dp"
                    android:layout_width="match_parent"
                    android:layout_height="2dp"/>

                <TextView
                    android:id="@+id/tv_history"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:textAppearance="@style/TextAppearance.RobotoLight" />

            </LinearLayout>

        </android.support.v7.widget.CardView>

    </LinearLayout>

</android.support.v4.widget.NestedScrollView>

<android.support.design.widget.FloatingActionButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="16dp"
    android:clickable="true"
    android:id="@+id/fab_location"
    android:src="@drawable/ic_fab_location_24dp"
    app:backgroundTint="@color/colorOrange"
    app:layout_anchor="@id/appbar"
    app:layout_anchorGravity="bottom|right|end" />

回答1:

It is due to the app:layout_anchor attribute. You must get rid of the anchor before changing visibility:

CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
p.setAnchorId(View.NO_ID);
fab.setLayoutParams(p);
fab.setVisibility(View.GONE);

回答2:

FloatingActionButtons anchored to AppBarLayouts have a special relationship where their visibility is controlled by the scroll position of the AppBarLayout.

You can turn this off via the behavior_autoHide attribute:

<android.support.design.widget.FloatingActionButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_anchor="..."
    app:behavior_autoHide="false"/>

You can also do this programmatically if you wish:

FloatingActionButton.Behavior b
    = (FloatingActionButton.Behavior) fab.getBehavior();
b.setAutoHideEnabled(false);

回答3:

If you want to show hidden FAB

    <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/coordinator"
        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:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            android:fitsSystemWindows="true">
    ...

    </android.support.design.widget.AppBarLayout>

    ...

    <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:visibility="gone"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:clickable="true"/>

</android.support.design.widget.CoordinatorLayout>

and

    CoordinatorLayout.LayoutParams p = new CoordinatorLayout.LayoutParams(CoordinatorLayout.LayoutParams.WRAP_CONTENT, CoordinatorLayout.LayoutParams.WRAP_CONTENT);
    p.anchorGravity = Gravity.BOTTOM | Gravity.END;
    p.setAnchorId(R.id.appbar);
    p.setMargins(...);
    fab.setLayoutParams(p);
    fab.setVisibility(View.VISIBLE);

回答4:

I wasn't completely happy with any of the solutions posted. Some only worked part of the time, while others only worked for fab.setVisibility(). While I know this is technically what the original question asked, a few responses expressed interest in using fab.hide(), and messing with the layout parameters doesn't exactly get to the root of the issue.

As pointed out by @ChrisBanes, the FloatingActionButton.Behavior being tied to the AppBarLayout is what causes the issue. So, as with his answer, you have to setAutoHideEnabled(false) to disable that functionality. But this solution doesn't help if you actually want the FloatingActionButton to hide automatically and when you call hide() manually.

So in order to do this; I simply disable the auto-hide functionality before I manually hide the Button, then re-enable the functionality after I manually show the Button:

private void hideFloatingActionButton(FloatingActionButton fab) {
    CoordinatorLayout.LayoutParams params =
            (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
    FloatingActionButton.Behavior behavior =
            (FloatingActionButton.Behavior) params.getBehavior();

    if (behavior != null) {
        behavior.setAutoHideEnabled(false);
    }

    fab.hide();
}

private void showFloatingActionButton(FloatingActionButton fab) {
    fab.show();
    CoordinatorLayout.LayoutParams params =
            (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
    FloatingActionButton.Behavior behavior =
            (FloatingActionButton.Behavior) params.getBehavior();

    if (behavior != null) {
        behavior.setAutoHideEnabled(true);
    }
}

回答5:

After some answers around, I founded the solution for my problem(also when the fab is hidden it can handle action!).

First of all I suggest you to replace .setVisibility(View.GONE) and .setVisibility(View.VISIBLE) with the methods .show() and .hide(). These last handle also actionMode.

The second problem for me was the action also handled when the fab was hidden, for resolve this I made it:

final CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams)floatingActionButton.getLayoutParams();
    if (show){
        p.setAnchorId(R.id.appBarLayout);
        p.width = CoordinatorLayout.LayoutParams.WRAP_CONTENT;
        p.height = CoordinatorLayout.LayoutParams.WRAP_CONTENT;
        floatingActionButton.setLayoutParams(p);
        floatingActionButton.show();
    }else{
        p.setAnchorId(View.NO_ID);
        p.width = 0;
        p.height = 0;
        floatingActionButton.setLayoutParams(p);
        floatingActionButton.hide();
    }

回答6:

The real solution for your problem is to subclass default FloatingActionButton.Behavior to call setAutoHide(false) in their constructors, so you can control it yourself.

Note that I talk about bottom sheets below, but it is exactly the same problem for all anchored Floating Action Buttons, and it does respond to the question and should solve the problem as expected.

Alternatively, you can override the boolean onDependentViewChanged(…) method from your custom Behavior, copy the isBottomSheet(…) static method present in the FloatingActionButton.Behavior class, and only call & return the value of the super method if it's not a bottom sheet.

You can further customize the default behavior this way, or by extending the vanilla CoordinatorLayout.Behavior class directly, and you can cherry pick code to copy paste from the FloatingActionButton.Behavior class if needed.

Here's the code I used to control back the FAB visibility:

/**
 * Allows controlling the FAB visibility manually.
 */
@SuppressWarnings("unused")
public class FabManualHideBehavior extends FloatingActionButton.Behavior {

    public FabManualHideBehavior() {
        super();
        setAutoHideEnabled(false);
    }

    public FabManualHideBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
        setAutoHideEnabled(false);
    }
}

And I applied it to my FAB in xml this way:

<android.support.design.widget.CoordinatorLayout
    ...>
    ...
    <android.support.design.widget.FloatingActionButton
        ...
        app:layout_anchor="@+id/bottom_sheet"
        app:layout_anchorGravity="top|end"
        app:layout_behavior="your.package.name.ui.behavior.FabManualHideBehavior"/>

</android.support.design.widget.CoordinatorLayout>

回答7:

None of these other solutions helped me 100%. I needed repeated, animated show and hide (like FAB.show() and hide()) all while anchored to the app bar when visible.

I ended up creating the FAB new every time I showed it, manually inserting and anchoring it, and animating it based on the support library implementation. It's gross, but it works perfectly.

private void hidePlayButton(final FloatingActionButton fab) {
    // Cancel any animation from the default behavior
    fab.animate().cancel();
    fab.animate()
               .scaleX(0f)
               .scaleY(0f)
               .alpha(0f)
               .setDuration(200)
               .setInterpolator(new FastOutLinearInInterpolator())
               .setListener(new Animator.AnimatorListener() {
                   @Override public void onAnimationStart(Animator animation) {}

                   @Override public void onAnimationEnd(Animator animation) {
                      coordinatorLayout.removeView(fab);
                   }

                   @Override public void onAnimationCancel(Animator animation) {}

                   @Override public void onAnimationRepeat(Animator animation) {}
               });
}

private void showPlayButton() {
    int fabSize = getResources().getDimensionPixelSize(R.dimen.fab_size);
    int margin = getResources().getDimensionPixelSize(R.dimen.fab_margin);
    final FloatingActionButton fab = new FloatingActionButton(getActivity());
    fab.setBackgroundTintList(ColorStateList.valueOf(ContextCompat.getColor(getActivity(), R.color.tint)));
    fab.setImageDrawable(ContextCompat.getDrawable(getActivity(), R.drawable.play));
    CoordinatorLayout.LayoutParams p = new CoordinatorLayout.LayoutParams(fabSize, fabSize);
    p.rightMargin = p.leftMargin = p.bottomMargin = p.topMargin = margin;
    p.anchorGravity = Gravity.BOTTOM | Gravity.END;
    p.setAnchorId(R.id.appbar);
    fab.setLayoutParams(p);
    // Start from 1 pixel
    fab.setAlpha(0f);
    fab.setScaleX(0f);
    fab.setScaleY(0f);
    binding.coordinatorLayout.addView(fab);
    fab.animate()
       .alpha(1f)
       .scaleX(1f)
       .scaleY(1f)
       .setDuration(200)
       .setInterpolator(new FastOutLinearInInterpolator());

    fab.setOnClickListener(new View.OnClickListener() {
        @Override public void onClick(View v) {
            hidePlayButton(fab);
            // do action
        }
    });
}

回答8:

Simple code :

   public static void setVisibilityFab(FloatingActionButton fab, int visibility)
  {

        CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
        p.setAnchorId(View.NO_ID);
        fab.setLayoutParams(p);
        if(visibility==View.GONE || visibility==View.INVISIBLE)
            fab.setVisibility(View.GONE);
        else
            fab.setVisibility(View.VISIBLE);
    }

回答9:

I know that you answer is about how to make it work for gone visibility but if you use invisible instead you will have no worries about that and is less code.

回答10:

I worked around the show()/hide() shortcoming by placing the FAB in or out of the screen using layout margins. example:

CoordinatorLayout.LayoutParams p =
   new CoordinatorLayout.LayoutParams(
      CoordinatorLayout.LayoutParams.WRAP_CONTENT,
      CoordinatorLayout.LayoutParams.WRAP_CONTENT);

p.gravity = Gravity.BOTTOM | Gravity.LEFT;
int fabMargin = (int)res.getDimension(R.dimen.fab_margin);

if( enabled ) {
   p.setMargins(fabMargin,0,0,fabMargin);
}
else {
   p.setMargins(-200,0,0,fabMargin);
}
mFab.setLayoutParams(p);

回答11:

I you use this code:

boolean mFabShouldBeShown;
FloatingActionButton.OnVisibilityChangedListener fabListener = new FloatingActionButton.OnVisibilityChangedListener() {
        @Override
        public void onShown(FloatingActionButton fab) {
            super.onShown(fab);
            if(!mFabShouldBeShown){
                fab.hide();
            }
        }

        @Override
        public void onHidden(FloatingActionButton fab) {
            super.onHidden(fab);
            if(mFabShouldBeShown){
                fab.show();
            }
        }
};

public void methodWhereFabIsHidden() {
    mFabShouldBeShown = false;
    mFloatingActionButton.hide(fabListener);
}

public void methodWhereFabIsShown() {
    mFabShouldBeShown = true;
    mFloatingActionButton.show(fabListener);
}

回答12:

here is simple solution

private var fabAnchorId: Int = View.NO_ID
private val fabParams: CoordinatorLayout.LayoutParams
        get() = (fab.layoutParams as CoordinatorLayout.LayoutParams)

fun showFab() {
    fabParams.anchorId = fabAnchorId
    fabParams.gravity = Gravity.NO_GRAVITY
    fab.show()
}

fun hideFab() {
    fabParams.anchorId = View.NO_ID
    fabParams.gravity = Gravity.END.or(Gravity.BOTTOM)
    fab.hide()
}

before show/hide we have to change anchor and gravity

回答13:

FloatingActionButton layers = (FloatingActionButton) findViewById(R.id.layers);

layers.hide();

回答14:

If you want to hide the fab, you can try this: fab.hide();

else try fab.show();

enjoy.