问题
I am having a FAB (FloatingActionButton) in my LinearLayout. I want the LinearLayout to be hidden i.e. visibility set to gone at first and on clicking menu button it should get visible. Everything is working fine but FAB remains visible for sometime before hiding itself. I tried everything from changing visibility of FAB and using hide() and show() but nothing works.
I got the following links but for some reason they don't work for me.
- FloatingActionButton always visible
- Gone FAB becames visible for a while
- FloatingActionButton doesn't hide
My activity_main.xml:
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.wolfarts.checklist2.MainActivity">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="0dp"
android:paddingTop="24dp"
android:theme="@style/MyToolbarStyle">
<Spinner
android:id="@+id/spinner_nav"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/Base.TextAppearance.AppCompat.Title"
android:visibility="gone"/>
</android.support.v7.widget.Toolbar>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/emptyStateView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center">
<ImageView
android:src="@drawable/emptystatebag"
android:layout_marginTop="-30dp"
android:layout_gravity = "center"
android:layout_height="170dp"
android:layout_width="300dp"/>
<TextView
android:paddingTop="8dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:gravity = "center"
android:text="Nothing here. Try Adding Something."
android:textColor="#B8B8B8"
android:textSize="18sp"/>
</LinearLayout>
<android.support.design.widget.CoordinatorLayout
android:id="@+id/maincontainer"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:animateLayoutChanges="true">
<LinearLayout
android:id="@+id/toolbarContent"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="72dp"
android:paddingStart="72dp"
android:paddingRight="18dp"
android:paddingEnd="18dp"
android:paddingBottom="80dp"
android:visibility="gone"
android:elevation="4dp"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true">
<android.support.design.widget.TextInputLayout
android:id="@+id/username_text_input_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColorHint="#B3FFFFFF"
android:layout_gravity="center_vertical">
<EditText
android:id="@+id/taskName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="35sp"
android:maxLines="1"
android:hint="Item Name"/>
</android.support.design.widget.TextInputLayout>
</LinearLayout>
<com.wolfarts.checklist2.CustomRecyclerView
android:id="@+id/taskListRecyclerView"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
</LinearLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:paddingLeft="16dp"
android:clickable="true"
android:src="@drawable/ic_done_white_24dp"
app:layout_anchor="@id/toolbarContent"
app:layout_anchorGravity="bottom|right|end"
app:backgroundTint="@color/orange"
android:visibility="gone"
app:elevation="8dp"/>
</android.support.design.widget.CoordinatorLayout>
</FrameLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/navDrawer"
android:layout_width="280dp"
android:layout_height="match_parent"
android:layout_gravity="left|start">
<ListView
android:id="@+id/navList"
android:paddingTop="24dp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#ffeeeeee"/>
</LinearLayout>
Is this a bug in FAB?
回答1:
CoordinatorLayout.LayoutParams p = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
p.setAnchorId(View.NO_ID);
p.width = 0;
p.height = 0;
fab.setLayoutParams(p);
fab.setVisibility(View.GONE);
回答2:
Have you tried this?: FloatingActionButton doesn't hide Removing the anchor seems to affect the setVisibility of the FAB.
回答3:
I was facing the same issue , floating action button shows up for sometime before hiding . First thing you should do is remove the anchor gravity , anchor and set its height and width to 0 in layout.
When you want to make it visible , set the height ,width , anchor , anchor gravity programitically like this :
CoordinatorLayout.LayoutParams p = new CoordinatorLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
p.setAnchorId(R.id.appbar);
p.anchorGravity = Gravity.BOTTOM|Gravity.END|Gravity.RIGHT;
fab.setLayoutParams(p);
fab.setVisibility(View.VISIBLE);
来源：https://stackoverflow.com/questions/32732932/floatingactionbutton-visible-for-sometime-even-if-visibility-is-set-to-gone