通过滚动 recyclerview 折叠 header 图像

Question

我有这样的 XML 布局：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="realup.ir.teacher.MainActivity">

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

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/app_bar_head">
        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|enterAlways"
            android:id="@+id/collapse_toolbar">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:src="@drawable/realup"
                android:id="@+id/header_image"/>


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

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

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



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

</RelativeLayout>

如您所见，我有一个 recyclerview，我希望当 recyclerview 向下滚动时，图像视图随着滚动 recyclerview 一起折叠。你能帮助我吗？提前谢谢你:)

Answer 1

以CoordinatorLayout为父布局，将RecyclerView放在FrameLayout中；

 <android.support.design.widget.CoordinatorLayout
    android:id="@+id/coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:background="#e7e5e5"
        android:layout_marginLeft="-20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

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

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:adjustViewBounds="true"
            android:scaleType="centerCrop"
            android:src="@drawable/realup"
            android:id="@+id/header_image"/>


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

    <FrameLayout
        android:id="@+id/dashboard_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/task_list"
            android:scrollbars="vertical"
            android:paddingBottom="85dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            android:layout_marginTop="10dp"
            android:clipToPadding="false"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

        </android.support.v7.widget.RecyclerView>

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

Answer 2

您的 RecyclerView 应该在 Coordinatorlayout 中以执行动画并使用 NestedScrollView 作为您的 RecyclerView 的父级：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="realup.ir.teacher.MainActivity">

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

    <android.support.design.widget.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/app_bar_head">
        <android.support.design.widget.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|enterAlways"
            android:id="@+id/collapse_toolbar">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:scaleType="centerCrop"
                android:src="@drawable/realup"
                android:id="@+id/header_image"/>


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

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

    <android.support.v4.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

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

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

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

要获得平滑的滚动效果，请在您的代码中添加：

RecyclerView recyclerView = (RecyclerView)findViewById(R.id.recycle);
recyclerView.setNestedScrollingEnabled(false);

希望对您有所帮助。

对不起我的英语。

通过滚动 recyclerview 折叠 header 图像

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