java - float 操作按钮和 View 寻呼机

Question

ViewPager 叠加在 fab 之上。如何将 fab 放在首位？

xml:

<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.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="@dimen/fab_margin"
    android:clickable="true"
    android:src="@drawable/ic_add"
    android:visibility="visible" />

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:contextClickable="true">

    <android.support.design.widget.TabLayout
        android:id="@+id/personal_tasks_tabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabSelectedTextColor="#deFFFFFF"
        app:tabTextColor="#81ffffff"
        app:tabGravity="fill" />
</android.support.design.widget.AppBarLayout>

<android.support.v4.view.ViewPager
    android:id="@+id/personal_tasks_viewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

或者也许这不是原因？当我在上面时，只是没有按下按钮，但选项卡被翻转。

Answer 1

CoordinatorLayout 就像一个 super FrameLayout，所以如果你在顶部放置一个 FAB，然后添加一个 ViewPager 时，ViewPager 将覆盖/叠加之前的 View。您可以尝试将 FAB 移至底部。

<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.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    android:contextClickable="true">

<android.support.design.widget.TabLayout
    android:id="@+id/personal_tasks_tabLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabSelectedTextColor="#deFFFFFF"
    app:tabTextColor="#81ffffff"
    app:tabGravity="fill" />
</android.support.design.widget.AppBarLayout>

<android.support.v4.view.ViewPager
    android:id="@+id/personal_tasks_viewpager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<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="@dimen/fab_margin"
    android:clickable="true"
    android:src="@drawable/ic_add"
    android:visibility="visible" />

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

您还可以尝试将 FAB 锚定到您的 ViewPager

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    app:layout_anchor="@id/personal_tasks_viewpager"
    app:layout_anchorGravity="bottom|end"
</android.support.design.widget.CoordinatorLayout>