RecyclerView滚动使用NestedScrollView

时间：2016-12-21 09:50:28

标签： android android-recyclerview android-nestedscrollview

我有一个布局，我有一个包含Image，多个按钮和RecycleView的NestedScrollView。

当我说 recycleView.smoothScrollToPosition 或 recycleView.scrollToPosition（）时，它目前没有做任何事情。拒绝滚动甚至像素。如果我删除NestedScrollView它工作正常，但万一我失去了对周围区域的滚动效果。

你们之前是否遇到过这个问题？ 

<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="world.the.rule.com.testtollbarstuff.ScrollingActivity">

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


    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        app:layout_collapseMode="none"
        app:popupTheme="@style/AppTheme.PopupOverlay" />


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

<android.support.design.widget.CollapsingToolbarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fitsSystemWindows="true"
    app:contentScrim="?attr/colorPrimary"
    app:layout_scrollFlags="scroll">

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

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

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:adjustViewBounds="true"
                android:clickable="true"
                android:src="@drawable/mock_image" />

            <include layout="@layout/content_scrolling" />

        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CollapsingToolbarLayout>

3 个答案:

答案 0 :(得分：3)

如果您只是想要平滑滚动，那么就不需要像我之前在其他帖子中提到的那样进行自定义滚动。

如果您想要开始平滑滚动

，请添加如下所示的行 
appBarLayout.setExpanded(false, /*true if animation required else false*/true);
recyclerView.smoothScrollToPosition(position);

其他信息

此外，我在您的布局中看不到任何RecyclerView，并且您可能已将其保留在LinearLayout中，这又是CollapsingToolbarLayout的一部分。我完全不知道为什么你将RecyclerView作为CollapsingToolbarLayout的一部分。我将给出一个我正在使用的布局（简化版）。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

        <android.support.design.widget.AppBarLayout
            android:id="@+id/app_bar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:expanded="true"
            app:layout_behavior="com.company.app.custom.CustomRecyclerScrollBehavior">

            <android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/collapsing_toolbar"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginEnd="64dp"
                app:expandedTitleMarginStart="48dp"
                app:layout_scrollFlags="scroll|exitUntilCollapsed">

                <FrameLayout
                    android:id="@+id/header_frame"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    app:layout_collapseMode="parallax"
                    app:layout_collapseParallaxMultiplier="0.8">

                    <com.company.app.custom.CustomViewPager
                        android:id="@+id/view_pager"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        app:calculation="height"
                        app:height_ratio="@integer/product_listitem_img_width_ratio"
                        app:width_ratio="@integer/product_listitem_img_height_ratio" />

                    <com.company.app.custom.CustomImageView
                        android:id="@+id/img_stock_layer"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:adjustViewBounds="true"
                        android:scaleType="fitXY"
                        android:src="@color/transparent_app_black"
                        android:visibility="gone"
                        app:calculation_type="height"
                        app:ratio_height="@integer/product_listitem_img_width_ratio"
                        app:ratio_width="@integer/product_listitem_img_height_ratio" />

                    <com.inneex.www.customfonts.FontTextView
                        android:id="@+id/lbl_out_of_stock"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="center"
                        android:text="@string/out_of_stock"
                        android:textColor="?android:attr/textColorPrimaryInverse"
                        android:textSize="13sp"
                        android:visibility="gone"
                        app:customFont="@string/font_ss_semibold" />

                    <LinearLayout
                        android:id="@+id/ll_page"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="bottom|center_horizontal"
                        android:orientation="horizontal"
                        android:paddingBottom="@dimen/inspire_detail_oval_margin_bottom" />

                </FrameLayout>

                <android.support.v7.widget.Toolbar
                    android:id="@+id/main_toolbar"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/toolbar_height"
                    android:background="?attr/colorPrimary"
                    app:layout_anchor="@id/header_frame"
                    app:layout_collapseMode="pin"
                    app:title="">

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

                        <com.inneex.www.customfonts.FontTextView
                            android:id="@+id/lbl_toolbar_product_name"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center"
                            android:layout_weight="1"
                            android:ellipsize="end"
                            android:lines="1"
                            android:maxLines="1"
                            android:minLines="1"
                            android:textColor="?android:attr/textColorPrimary"
                            android:textSize="18sp"
                            app:customFont="@string/font_ss_semibold" />

                    </LinearLayout>
                </android.support.v7.widget.Toolbar>
            </android.support.design.widget.CollapsingToolbarLayout>

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

        <ImageView
            android:id="@+id/img_back"
            android:layout_width="@dimen/toolbar_height"
            android:layout_height="@dimen/toolbar_height"
            android:layout_gravity="top|start"
            android:scaleType="fitXY"
            android:src="@drawable/back"
            app:layout_collapseMode="parallax" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@color/white"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

    <include
        layout="@layout/listitem_product_detail_buy_cheap"
        android:layout_width="match_parent"
        android:layout_height="@dimen/product_detail_button_buy_cheap_height"
        android:layout_alignParentBottom="true"
        android:layout_gravity="bottom" />

</RelativeLayout>
ID为FrameLayout的

header_frame负责大工具栏，滚动时会折叠。 ID为Toolbar的{​​{1}}负责工具栏的折叠视图。 main_toolbar位于以下RecyclerView。 AppBarLayout用于显示折叠后显示的后退按钮ImageView。

作为参考，为了使滚动顺利，我添加了Toolbar，我之前与您交谈。这就是它

CustomRecyclerScrollBehavior

此类用于在嵌套滚动条中保持import android.content.Context; import android.support.design.widget.AppBarLayout; import android.support.design.widget.CoordinatorLayout; import android.support.v7.widget.RecyclerView; import android.util.AttributeSet; import android.view.View; import java.lang.ref.WeakReference; import java.util.HashMap; import java.util.Map; /** * Created by jimitpatel on 13/12/16. */ public class CustomRecyclerScrollBehavior extends AppBarLayout.Behavior { private Map<RecyclerView, RecyclerViewScrollListener> scrollListenerMap = new HashMap<>(); //keep scroll listener map, the custom scroll listener also keep the current scroll Y position. public CustomRecyclerScrollBehavior() { } public CustomRecyclerScrollBehavior(Context context, AttributeSet attrs) { super(context, attrs); } /** * * @param coordinatorLayout * @param child The child that attached the behavior (AppBarLayout) * @param target The scrolling target e.g. a recyclerView or NestedScrollView * @param velocityX * @param velocityY * @param consumed The fling should be consumed by the scrolling target or not * @return */ @Override public boolean onNestedFling(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, float velocityX, float velocityY, boolean consumed) { if (target instanceof RecyclerView) { final RecyclerView recyclerView = (RecyclerView) target; if (scrollListenerMap.get(recyclerView) == null) { RecyclerViewScrollListener recyclerViewScrollListener = new RecyclerViewScrollListener(coordinatorLayout, child, this); scrollListenerMap.put(recyclerView, recyclerViewScrollListener); recyclerView.addOnScrollListener(recyclerViewScrollListener); } scrollListenerMap.get(recyclerView).setVelocity(velocityY); consumed = scrollListenerMap.get(recyclerView).getScrolledY() > 0; //recyclerView only consume the fling when it's not scrolled to the top } return super.onNestedFling(coordinatorLayout, child, target, velocityX, velocityY, consumed); } private static class RecyclerViewScrollListener extends RecyclerView.OnScrollListener { private int scrolledY; private boolean dragging; private float velocity; private WeakReference<CoordinatorLayout> coordinatorLayoutRef; private WeakReference<AppBarLayout> childRef; private WeakReference<CustomRecyclerScrollBehavior> behaviorWeakReference; public RecyclerViewScrollListener(CoordinatorLayout coordinatorLayout, AppBarLayout child, CustomRecyclerScrollBehavior barBehavior) { coordinatorLayoutRef = new WeakReference<>(coordinatorLayout); childRef = new WeakReference<>(child); behaviorWeakReference = new WeakReference<>(barBehavior); } @Override public void onScrollStateChanged(RecyclerView recyclerView, int newState) { dragging = newState == RecyclerView.SCROLL_STATE_DRAGGING; } public void setVelocity(float velocity) { this.velocity = velocity; } public int getScrolledY() { return scrolledY; } @Override public void onScrolled(RecyclerView recyclerView, int dx, int dy) { scrolledY += dy; if (scrolledY <= 0 && !dragging && childRef.get() != null && coordinatorLayoutRef.get() != null && behaviorWeakReference.get() != null) { //manually trigger the fling when it's scrolled at the top behaviorWeakReference.get().onNestedFling(coordinatorLayoutRef.get(), childRef.get(), recyclerView, 0, velocity, false); } } } } 的滚动速度。这里的改变已经改变了

希望这对你有用！

答案 1 :(得分：1)

这样做

recycleView.smoothScrollToPosition(80);

以后，不在onCreate方法中，使用延迟线程或使用其他覆盖方法。

示例： 

     new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
              recycleView.smoothScrollToPosition(80);
        }
     }, 150);

答案 2 :(得分：0)

给一些固定的高度而不是match_parent或wrap_content到recyclerview。因为当scrollview内的recyclerview，它的高度将是其项目的总高度，所以这将禁用recyclelerview的滚动并仅启用nestedscrollview。

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