提问者:小点点

浮动操作按钮锚点


我需要在 android 中锚定浮动动作按钮,但遇到了麻烦:fab 将在导航视图中查看这是我的activity_main布局。它包括导航抽屉。

<android.support.v4.widget.DrawerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorBackground">
    <!-- The main content view -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <include
            layout="@layout/toolbar_main"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </LinearLayout>
    <!-- The navigation drawer -->
    <include
        layout="@layout/nav_drawer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="start"/>
</android.support.v4.widget.DrawerLayout>

导航抽屉布局:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    android:id="@+id/clDrawer"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary">

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

        <android.support.design.widget.NavigationView
            android:id="@+id/navView"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            app:menu="@menu/menu_drawer_view"
            app:headerLayout="@layout/anav_header"
            android:background="@color/colorPrimary2"
            app:itemIconTint="@color/colorIcon"
            app:itemTextColor="@color/colorIcon"/>
    </LinearLayout>


    <android.support.design.widget.FloatingActionButton
        android:id="@+id/navFAB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/activity_horizontal_margin"
        android:clickable="true"
        android:src="@drawable/plus_icon"
        app:backgroundTint="@color/colorIcon"
        app:layout_anchor="@id/headerLayout"
        app:layout_anchorGravity="bottom|right|end" />

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

我的导航视图anav_header只包含少数文本视图。我需要fab锚定到标题的botom,就在标题和ND的主要内容之间。问题是layout_anchor仅当标题和导航视图位于同一布局中时才有效。如果我使用导航视图属性标题布局layout_anchor不起作用。另外,如果我使用NavigationView.addHeaderView(),它也不起作用。如果我通过这种方式在导航视图布局中包含标题

<include
        layout="@layout/anav_header"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

它可以工作,但是标题和导航视图像不同的部分一样移动。我需要它们像一个导航抽屉一样。我需要导航抽屉来看起来像那样。


共1个答案

匿名用户

我找到了自己的路。首先,我删除了NavigationView并将其替换为drawer_header.xml带有标题图像的简单LinearLayout,并且紧随其后的drawer_list是带有静态菜单项的LinearLayout

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary2">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <LinearLayout
            android:background="@color/colorPrimary2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <!-- <android.support.design.widget.NavigationView
                 android:id="@+id/navView"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:background="@color/colorPrimary2"
                 app:headerLayout="@layout/drawer_header"
                 app:itemIconTint="@color/colorIcon"
                 app:itemTextColor="@color/colorIcon"
                 app:menu="@menu/menu_drawer_view" />-->
            <include
                layout="@layout/drawer_header"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="@dimen/activity_horizontal_margin"/>
            <include
                layout="@layout/layout_drawer_list"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

        </LinearLayout>
    </ScrollView>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/navFAB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/activity_horizontal_margin"
        android:clickable="true"
        android:src="@drawable/plus_icon"
        app:backgroundTint="@color/colorIcon"
        app:layout_anchor="@id/headerLayout"
        app:layout_anchorGravity="bottom|right|end" />

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

所以,我将标题和菜单制作为 LinearLayout,否则它们都滚动了,但我需要它们一起滚动。要在标题或菜单中添加元素,您可以使用addView(View v)。