FloatingActionButton片段中的隐藏工具栏上的崩溃 [英] FloatingActionButton in Fragment hidden on Toolbar collapsing

问题描述

我有一个有3个标签的活动。每个标签页是显示RecyclerView片段。一片段的具有FloatingActionButton在它。我实施这个按钮在片段的布局。我也使得静态的片段的右下角。

I have an activity that has 3 tabs. Each tabs page is a fragment which displays a RecyclerView. One of the fragment has FloatingActionButton in it. I'm implementing this Button in the Fragment's layout. I'm also making it static at the bottom right of the Fragment.

片段布局：

- CoordinatorLayout
    - RecyclerView
    - FAB (without any behavior)

在活动的布局，我有：

- CoordinatorLayout
    - AppBarLayout
        - Toolbar
        - TabLayout (SmartTabLayout)
    - ViewPager

现在的问题是FAB从视图半隐藏工具栏时展开，但是当工具栏被折叠尽显。但如果我在活动实施FAB按钮本身不会发生这种情况。但我不希望在所有片段的按钮。我只是把它在第一个片段。

The problem now is the FAB is half-hidden from the view when Toolbar is expanded, but fully shown when Toolbar is collapsed. Though this does not happen if I implement the FAB button in Activity itself. But I don't want to have the button in all of the Fragments. I'm only putting it in first Fragment.

下面是我做出了解释得更为清晰的GIF。

Here is a gif I made to explain this clearer.

XML的活动布局：

<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/coordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar 
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:minHeight="?attr/actionBarSize"
            android:background="@color/color_primary"
            app:layout_scrollFlags="scroll|enterAlways" />

        <com.ogaclejapan.smarttablayout.SmartTabLayout
            android:id="@+id/viewpagertab"
            android:layout_width="match_parent"
            android:layout_height="@dimen/tab_height"
            android:background="@color/color_primary" />

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

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

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

XML片段为布局：

XML for Fragment layout:

<?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/coordinatorLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/card_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_plus_white_48dp"
        app:layout_anchor="@id/card_list"
        app:layout_anchorGravity="bottom|right|end" />

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

我的问题是我怎么做，这样，当recyclerview滚动按钮仍然显示？

My question is how do I make so that the button stays visible when recyclerview is scrolled?

推荐答案

最好的办法是干脆把FloatingActionButton的活动，并呼吁显示（）和隐藏（）在 ViewPager.OnPageChangeListener 。这样，你得到很好的<一个href=\"https://material-design.storage.googleapis.com/publish/material_v_4/material_ext_publish/0B6Okdz75tqQsVlhxNGJCNTEzNFU/components-buttons-fab-behavior_04_xhdpi_009.webm\"符合相对=nofollow>进入/退出动画以<一个href=\"https://www.google.com/design/spec/components/buttons-floating-action-button.html#buttons-floating-action-button-floating-action-button\"相对=nofollow>材料设计准则。

The best option would be to just put the FloatingActionButton in the Activity, and call show() and hide() in a ViewPager.OnPageChangeListener. This way you get nice enter/exit animations that conform to Material Design guidelines.

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

    }

    @Override
    public void onPageSelected(int position) {
        if (position == 0) {
            fabAdd.show();
        } else {
            fabAdd.hide();
        }
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }
});

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