Android CollapsingToolbarLayout setLayoutFlags里面的视图

Question

I'm trying to make a CollapsingToolbarLayout that is like GooglePlay .
All is fine except for one thing.
I can't make the toolbar inside CollapsingToolbarLayout to alwaysEnter

<android.support.design.widget.CollapsingToolbarLayout
                android:elevation="2dp"
                app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"
                app:contentScrim="@color/colorPrimaryDark"
                android:id="@+id/toolbar_layout"
                android:fitsSystemWindows="true"
                app:titleEnabled="false"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <ImageView
                    app:layout_collapseMode="parallax"
                    android:maxHeight="300dp"
                    android:id="@+id/profileFarmImage_loggedLO"
                    android:adjustViewBounds="true"
                    android:scaleType="centerCrop"
                    android:fitsSystemWindows="true"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    app:popupTheme="@style/AppTheme.PopupOverlay"/>

                <android.support.v7.widget.Toolbar
                    app:layout_scrollFlags="scroll|enterAlways|snap"
                    android:layout_width="match_parent"
                    app:layout_collapseMode="pin"
                    android:layout_height="?attr/actionBarSize"
                    app:popupTheme="@style/AppTheme.PopupOverlay" />

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

I know that setting scrollFlags inside CollapsingToolbarLayout won't have any effect, but if I set the scrollFlags of my CollapsingToolbarLayout as enterAlwaysCollapsed I get unwanted behavior in which when the screen is scrolled to bottom and when I scrollup again all the views inside CollapsingToolbarLayout is shown. That's not the behavior I want.

The behavior I want is when the screen is scrolled to bottom then when I scroll up I only want the toolbar to show and when the screen is scrolled to top only then it will show the remaining view inside CollapsingToolbarLayout .

I know that this behavior is possible since GooglePlay implements it.

Answer 1

我可以通过设置CollapsingToolbarLayout来修复它

android:minHeight="?attr/actionBarSize"