RecyclerView滚动不适用于NestedScrollView [英] RecyclerView scroll dosen't work with NestedScrollView
本文介绍了RecyclerView滚动不适用于NestedScrollView的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个布局，其中有一个NestedScrollView，其中包含一个Image，多个按钮和一个RecycleView.
I have a layout where I have a NestedScrollView containing an Image, multiple buttons and a RecycleView.
当我说 recycleView.smoothScrollToPosition 或 recycleView.scrollToPosition()时，它目前什么也不做.拒绝滚动甚至一个像素.如果我删除NestedScrollView，它可以正常工作，但是如果我失去了对周围区域的滚动效果.
When I say recycleView.smoothScrollToPosition or recycleView.scrollToPosition() it doesn't do anything at the moment. Refuse to scroll even a pixel. If I remove the NestedScrollView it works fine, but in case I lose the scrolling effect on the surrounding areas.
你们中的任何人以前遇到过这个问题吗?
Does any of you met with this problem before?
<?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>
推荐答案
如果您只想平滑滚动，那么就不需要我在其他一些线程中提到的自定义滚动.
If you just want smooth scroll then no custom scrolling required as I mentioned earlier in some other thread.
要开始平滑滚动时，请如下添加行
Add lines as below when ever you want to start smooth scroll
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，并且您很有可能将其保存在LinearLayout中，而这又是CollapsingToolbarLayout的一部分.我完全不知道为什么您将RecyclerView保留为CollapsingToolbarLayout的一部分.我将给出一个正在使用的布局(简化的布局).
Additionally, I don't see any RecyclerView in your layout and chances are there you have kept it in LinearLayout which is again part of CollapsingToolbarLayout. I have absolutely no idea why you have kept RecyclerView as part of CollapsingToolbarLayout. I will give a layout (simplified one) which I am using.
<?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header_frame的
FrameLayout负责大型工具栏，该工具栏在滚动时会折叠. ID为main_toolbar的Toolbar负责工具栏的折叠视图. RecyclerView是下面的AppBarLayout. ImageView用于后退按钮，显示折叠的Toolbar后将显示该按钮.
FrameLayout with id header_frame is responsible for big toolbar which will collapse on scrolling. Toolbar with id main_toolbar is responsible for collapsed view of toolbar. RecyclerView is the below AppBarLayout. ImageView is for back button that will be displayed once collapsed Toolbar is displayed.
作为参考，为使滚动平滑，我添加了CustomRecyclerScrollBehavior，我之前已经与您交谈过.这就是它
For reference, to make scroll smooth I have added CustomRecyclerScrollBehavior which I talked earlier with you. This is what it is
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);
}
}
}
}
此类用于维护嵌套滚动中RecyclerView的滚动速度.逃跑已经改变了这里
This class is used for maintaining scroll speed for RecyclerView in nested scrolls. It's fling has been changed over here
希望这对您有用！
这篇关于RecyclerView滚动不适用于NestedScrollView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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