问题
I have a layout where I have a NestedScrollView containing an Image, multiple buttons and a RecycleView.
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.
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>
回答1:
If you just want smooth scroll then no custom scrolling required as I mentioned earlier in some other thread.
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);
Additional Info
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>
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.
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);
}
}
}
}
This class is used for maintaining scroll speed for RecyclerView in nested scrolls. It's fling has been changed over here
Hope this works out for you!
回答2:
do this
recycleView.smoothScrollToPosition(80);
later , not inside onCreate method , either use delayed thread or in another overide method.
example :
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
recycleView.smoothScrollToPosition(80);
}
}, 150);
回答3:
Give some fixed height instead of match_parent or wrap_content to recyclerview.Because when recyclerview inside scrollview , Its height wll be the total height of its items , So this will disable the scroll of recyclerview and enable the nestedscrollview only.
来源：https://stackoverflow.com/questions/41259756/recyclerview-scroll-dosent-work-with-nestedscrollview