java - fab.setVisibility(View.GONE) 不工作

Question

我没有使用 anchor ，它应该可以工作。最初，可见性消失了(由 XML 设置)。当我按下一个按钮时，它变得可见(直到这里，工作)。然后，当我按下另一个按钮时，它应该消失了，但没有任何反应。减少 XML:

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        android:id="@+id/tbTela3"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/ToolBar"
        app:titleTextColor="#757575"
        app:subtitleTextColor="#757575" />

    <android.support.design.widget.CoordinatorLayout
        android:id="@+id/cLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/tbTela3">

        <ScrollView>
            [...]
        </ScrollView>

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:elevation="8dp"
            android:src="@drawable/replay"
            android:visibility="gone"/>

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

减少主要 Activity :

public void ZoomIn() {

    [...]

    zoomIn.setAnimationListener(new Animation.AnimationListener() {
        public void onAnimationStart(Animation anim) {}
        public void onAnimationRepeat(Animation anim) {}

        public void onAnimationEnd(Animation anim) {
            fab.setVisibility(View.VISIBLE); // WORKS FINE
        }
    });

    fab.startAnimation(zoomIn);
}

[...]

public void Clear() {

    [...]

    anim.addListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {
            super.onAnimationEnd(animation);
            readX.requestFocus();
            cardII.setVisibility(View.GONE); // WORKS FINE TOO
            fab.setVisibility(View.GONE); // BUT THIS DON'T

            fadeOut.setAnimationListener(new Animation.AnimationListener() {
                public void onAnimationStart(Animation anim) {}
                public void onAnimationRepeat(Animation anim) {}

                public void onAnimationEnd(Animation anim) {
                    clear.setVisibility(View.INVISIBLE); 
                }
            });

            clear.startAnimation(fadeOut);
        }
    });

    anim.start();

}

fab.setVisibility(View.GONE) 无法独立于它在 Clear 上的位置工作...我减少了代码以提高可读性，希望这不是问题。

Answer 1

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

或者试试

    fab.show(); //show
    fab.hide(); //hide