footer scrolls off screen when used in CoordinatorLayout

问题

I have HomeActivity which contains fragment and at the bottom it has custom navigation view as shown below.

By clicking on profile pic, it replaces the fragment with UserProfileView fragment. userProfileView fragment has Collapsing toolbar inside coordinatorLayout.

userprofileview.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:bind="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <data>

        <variable
            name="resource"
            type="com.example.app.model.ResourceData" />


        <import type="android.view.View" />

    </data>

    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/bg_home"
        android:fitsSystemWindows="true">

        <android.support.design.widget.AppBarLayout
            android:id="@+id/app_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/bg_home">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/toolbar_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">

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


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

        <LinearLayout
            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:layout_marginTop="@dimen/_10sdp"
                android:orientation="horizontal">

                <ImageView
                    android:id="@+id/ic_list"
                    android:layout_width="@dimen/_17sdp"
                    android:layout_height="@dimen/_17sdp"
                    android:layout_gravity="center"
                    android:layout_marginLeft="@dimen/_10sdp"
                    android:background="@drawable/ic_list_selected" />

                <ImageView
                    android:id="@+id/ic_grid_view"
                    android:layout_width="@dimen/_15sdp"
                    android:layout_height="@dimen/_15sdp"
                    android:layout_gravity="center"
                    android:layout_marginLeft="@dimen/_10sdp"
                    android:background="@drawable/ic_grid_unselected" />
            </LinearLayout>

            <android.support.v7.widget.RecyclerView
                android:visibility="gone"
                android:id="@+id/rv_post"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:resource="@{resource}" />

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

The problem is when i click to any other menu from bottom navigation menu, it scrolls off the screen as shown below.

This issue is occurring after adding CoordinatorLayout in UserProfileView framgment.

If i replace CoordinatorLayout with LinearLayout then it works fine but doesn't get the functionality of collapsing toolbar.

Thank you!

回答1:

android:fitsSystemWindows="true" in your fragment_user_profile.xml causes problem. Simply... it makes your drawer layout looks fullscreen.

Roughly, user screen maintains top indicator margin and home screen doesn't. So home screen moved up as indicator size. (Actually it isn't, Details about fitsSystemWindows: Why would I want to fitsSystemWindows)

So, remove fitsSystemWindows from fragment_user_profile.xml will fix your problem.

And I suggest you add fitsSystemWindows to your container_body in activity_main.xml, but I'm not sure that what is the actual code, so it is your call.

来源：https://stackoverflow.com/questions/47221647/footer-scrolls-off-screen-when-used-in-coordinatorlayout