I need behavior similar to this implementation But NestedScrollView would be the parent and RecyclerView would be the child of would NestedScrollView .
I am not sure whether it can be achieved.Tried disabling the of parent(NSV) while child(RV)is scrolling But scroll on child scrolls the entire view including parent.
I'v implemented Marc Knaup solution and all works correct event if NestedScrollView would be the parent and the result was shown below
btw, i put what i'v done
CustomRecycleView
package com.example.nested_scroll_test;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import androidx.core.view.NestedScrollingParent;
import androidx.recyclerview.widget.RecyclerView;
public class CustomRecycleView extends RecyclerView implements NestedScrollingParent {
private View nestedScrollTarget = null;
private boolean nestedScrollTargetIsBeingDragged = false;
private boolean nestedScrollTargetWasUnableToScroll = false;
private boolean skipsTouchInterception = false;
public CustomRecycleView(Context context) {
super(context);
}
public CustomRecycleView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CustomRecycleView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
boolean temporarilySkipsInterception = nestedScrollTarget != null;
if (temporarilySkipsInterception) {
// If a descendent view is scrolling we set a flag to temporarily skip our onInterceptTouchEvent implementation
skipsTouchInterception = true;
}
// First dispatch, potentially skipping our onInterceptTouchEvent
boolean handled = super.dispatchTouchEvent(ev);
if (temporarilySkipsInterception) {
skipsTouchInterception = false;
// If the first dispatch yielded no result or we noticed that the descendent view is unable to scroll in the
// direction the user is scrolling, we dispatch once more but without skipping our onInterceptTouchEvent.
// Note that RecyclerView automatically cancels active touches of all its descendents once it starts scrolling
// so we don't have to do that.
if (!handled || nestedScrollTargetWasUnableToScroll) {
handled = super.dispatchTouchEvent(ev);
}
}
return handled;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
return !skipsTouchInterception && super.onInterceptTouchEvent(e);
}
@Override
public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed) {
if (dyConsumed != 0) {
// The descendent was actually scrolled, so we won't bother it any longer.
// It will receive all future events until it finished scrolling.
nestedScrollTargetIsBeingDragged = true;
nestedScrollTargetWasUnableToScroll = false;
} else if (dyConsumed == 0 && dyUnconsumed != 0) {
// The descendent tried scrolling in response to touch movements but was not able to do so.
// We remember that in order to allow RecyclerView to take over scrolling.
nestedScrollTargetWasUnableToScroll = true;
if (target.getParent() != null)
target.getParent().requestDisallowInterceptTouchEvent(false);
}
}
@Override
public void onNestedScrollAccepted(View child, View target, int axes) {
if (axes != 0 && View.SCROLL_AXIS_VERTICAL != 0) {
// A descendent started scrolling, so we'll observe it.
nestedScrollTarget = target;
nestedScrollTargetIsBeingDragged = false;
nestedScrollTargetWasUnableToScroll = false;
}
super.onNestedScrollAccepted(child, target, axes);
}
@Override
public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
return nestedScrollAxes != 0 && View.SCROLL_AXIS_VERTICAL != 0;
}
@Override
public void onStopNestedScroll(View child) {
nestedScrollTarget = null;
nestedScrollTargetIsBeingDragged = false;
nestedScrollTargetWasUnableToScroll = false;
}
}
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="@layout/activity_main">
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorAccent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:background="#FFFFFF"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textAlignment="center"
android:text="Top Section"/>
</LinearLayout>
<com.example.nested_scroll_test.CustomRecycleView
android:id="@+id/rw"
android:layout_width="match_parent"
android:layout_height="300dp"
android:background="@color/colorPrimary"
android:nestedScrollingEnabled="true"
android:orientation="vertical">
</com.example.nested_scroll_test.CustomRecycleView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:background="#FFFFFF"
android:orientation="vertical" >
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textAlignment="center"
android:text="Bottom Section"/>
</LinearLayout>
</LinearLayout>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
RecycleViewItem.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/nsw"
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="vertical">
<TextView
android:id="@+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:background="#CCCC"
android:gravity="center"
android:nestedScrollingEnabled="false"
android:orientation="vertical"
android:padding="2dp"
android:textColor="#FFFFFF" />
</androidx.core.widget.NestedScrollView>
post entire thing what you have tried so far.
your xml should be ,
<android.support.v4.widget.NestedScrollView
android:id="@+id/nestedScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<View > <!-- upper content -->
<!-- set recycler view with with wrap_content -->
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
set scrolling behaviour inside onCreateView() / onCreate() method. requires Api 21+ .
RecyclerView v = (RecyclerView) findViewById(...);
v.setNestedScrollingEnabled(false);
or
android:nestedScrollingEnabled="false" // inside recycler view in xml file
@Rockin use overscrollmode bro:)
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:fillViewport="true"
android:overScrollMode="always"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/color_white"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/activity_insight_recyclerview_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="@dimen/_20sdp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:listitem="@layout/raw_insight" />
This is demo for what you want look, In MainActivity.xml file :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="MainActivity">
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusableInTouchMode="true"
android:orientation="vertical">
<ImageView
android:id="@+id/top_seller"
android:layout_width="match_parent"
android:layout_height="200sp"
android:background="@color/colorAccent"
android:contentDescription="@string/app_name"
android:adjustViewBounds="true"
android:src="@drawable/background"
android:scaleType="fitXY"/>
<ImageView
android:id="@+id/top_seller1"
android:layout_width="match_parent"
android:layout_height="200sp"
android:background="@color/colorAccent"
android:contentDescription="@string/app_name"
android:adjustViewBounds="true"
android:src="@drawable/background"
android:scaleType="fitXY"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/product_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:scrollbars="none" />
<ImageView
android:id="@+id/top_seller2"
android:layout_width="match_parent"
android:layout_height="200sp"
android:background="@color/colorAccent"
android:contentDescription="@string/app_name"
android:adjustViewBounds="true"
android:src="@drawable/background"
android:scaleType="fitXY"/>
<ImageView
android:id="@+id/top_seller3"
android:layout_width="match_parent"
android:layout_height="200sp"
android:background="@color/colorAccent"
android:contentDescription="@string/app_name"
android:adjustViewBounds="true"
android:src="@drawable/background"
android:scaleType="fitXY"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
In your MainActivity.java class onCreate method:
RecyclerView bestRecyclerView = findViewById(R.id.product_list);
GridLayoutManager mGrid = new GridLayoutManager(this, 2);
bestRecyclerView.setLayoutManager(mGrid);
bestRecyclerView.setHasFixedSize(true);
bestRecyclerView.setNestedScrollingEnabled(false);
// Create ProductAdapter for RecyclerView data
ProductAdapter mAdapter = new ProductAdapter(MainActivity4.this,getProductTestData());
bestRecyclerView.setAdapter(mAdapter);
I hope It'll help you...!
Have you try subclass the RV and override onInterceptTouchEvent?
override fun onInterceptTouchEvent(event: MotionEvent?): Boolean {
when (event!!.action and MotionEvent.ACTION_MASK) {
MotionEvent.ACTION_DOWN -> {
// WE INTERACT WITH THIS RV. PREVENT PARENT TO INTERCEPT
parent.requestDisallowInterceptTouchEvent(true)
}
MotionEvent.ACTION_MOVE, MotionEvent.ACTION_CANCEL, MotionEvent.ACTION_UP -> {
// THIS SEEMS LIKE IT WILL HAVE "DEFAULT" BEHAVIOUR BUT SINCE WE CURRENTLY DRAGGING THE RV THEN IT WONT SCROLL THE PARENT
parent.requestDisallowInterceptTouchEvent(false)
}
}
return false
}
