FloatingActionButton不隐藏

Question

我试图以fabLocation编程方式隐藏我的FloatingActionButton :

fabLocation.setVisibility(View.GONE)

但它不起作用.

如果我添加android:visibility="gone"我的XML布局,fabLocation当我运行我的活动时会隐藏它,但是当我滚动时它会重新出现.

这是我的布局:

<?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" />

Answer 1

这是由于app:layout_anchor属性.在更改可见性之前,您必须摆脱锚点:

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

Answer 2

锚定到AppBarLayouts的FloatingActionButtons具有特殊关系,其可见性由AppBarLayout的滚动位置控制.

您可以通过以下behavior_autoHide属性将其关闭:

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

如果您愿意,也可以以编程方式执行此操作:

CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
FloatingActionButton.Behavior behavior = (FloatingActionButton.Behavior) lp.getBehavior();
if (behavior != null) {
    behavior.setAutoHideEnabled(false);
} else {
    behavior = new FloatingActionButton.Behavior();
    behavior.setAutoHideEnabled(false);
    lp.setBehavior(behavior);
}

Answer 3

我对发布的任何解决方案都不满意.有些人只在部分时间工作,而其他人只工作fab.setVisibility().虽然我知道这在技术上是原始问题所要求的,但是一些回复表示对使用感兴趣fab.hide(),并且弄乱布局参数并没有完全找到问题的根源.

正如@ChrisBanes所指出的,与之FloatingActionButton.Behavior相关的AppBarLayout是导致问题的原因.因此,正如他的回答一样,您必须setAutoHideEnabled(false)禁用该功能.但是,如果您确实希望FloatingActionButton自动隐藏以及hide()手动调用时,此解决方案无效.

所以为了做到这一点; 我只是在手动隐藏之前禁用自动隐藏功能Button,然后在我手动显示后重新启用功能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);
    }
}

Answer 4

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

它对我有用，对它setVisibility不起作用，FloatingActionButton因为它属于另一个viewGroup没有setVisibility方法的东西。

Answer 5

如果要显示隐藏的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>

和

    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);

Answer 6

隐藏和显示浮动操作栏的最简单方法是在您的活动中调用它。

隐藏：

nameOfYourFAB.Hide();

显示：

nameOfYourFAB.Show();