Hiding the middle view first in terms of the coordinator

Question

I have a layout as follows

• Layout1
• Layout2
• Scrollview

When scrolling, I need to cancel Layout2 first and then Layout1. For example, first look at the next view of the gif, and then the top view disappears. I suspect that I need some kind of custom behavior code, but I don’t know where to start.

Here is my current xml

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="com.example.chamoda.coordinatelayoutdemo.ScrollingActivity">

<android.support.design.widget.AppBarLayout
    android:id="@+id/app_bar"
    android:layout_width="match_parent"
    android:layout_height="180dp"
    android:fitsSystemWindows="true"
    android:theme="@style/AppTheme.AppBarOverlay">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:background="@color/colorAccent"
        app:layout_scrollFlags="scroll" >

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:background="@color/colorPrimary"
        app:layout_scrollFlags="scroll" >

    </LinearLayout>

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

<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.chamoda.coordinatelayoutdemo.ScrollingActivity"
    tools:showIn="@layout/activity_scrolling">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/text_margin"
        android:text="@string/large_text" />

</android.support.v4.widget.NestedScrollView>

How to archive this animation using coordinate layout?

Answer 1

You can use CollapsingToolbarLayoutand Toolbarto do this. See this great tutorial for more information:

https://inthecheesefactory.com/blog/android-design-support-library-codelab/en