NestedScrolling with NestedScrollView, RecyclerView (Horizontal), inside a CoordinatorLayout

Question

I have a UI design with CollapsingToolbarLayout, like following.

Answer 1

Hey if you're interested I created a LayoutManager that should solve your problem.

public class ExpansiveLayoutManager extends LinearLayoutManager {

private int[] mMeasuredDimension = new int[2];

public ExpansiveLayoutManager(Context context) {
    super(context);
}

public ExpansiveLayoutManager(Context context, int orientation, boolean reverseLayout) {
    super(context, orientation, reverseLayout);
}

public ExpansiveLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
}

@Override
public boolean canScrollVertically() {
    return false;
}

@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
                      int widthSpec, int heightSpec) {
    final int widthMode = View.MeasureSpec.getMode(widthSpec);
    final int heightMode = View.MeasureSpec.getMode(heightSpec);
    final int widthSize = View.MeasureSpec.getSize(widthSpec);
    final int heightSize = View.MeasureSpec.getSize(heightSpec);

    int width = 0;
    int height = 0;
    for (int i = 0; i < getItemCount(); i++) {
        measureScrapChild(recycler, i,
                View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                mMeasuredDimension);

        if (getOrientation() == HORIZONTAL) {
            width = width + mMeasuredDimension[0];
            if (i == 0) {
                height = mMeasuredDimension[1];
            }
        } else {
            height = height + mMeasuredDimension[1];
            if (i == 0) {
                width = mMeasuredDimension[0];
            }
        }
    }
    switch (widthMode) {
        case View.MeasureSpec.EXACTLY:
            width = widthSize;
        case View.MeasureSpec.AT_MOST:
        case View.MeasureSpec.UNSPECIFIED:
    }

    switch (heightMode) {
        case View.MeasureSpec.EXACTLY:
            height = heightSize;
        case View.MeasureSpec.AT_MOST:
        case View.MeasureSpec.UNSPECIFIED:
    }

    setMeasuredDimension(width, height);
}

private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                               int heightSpec, int[] measuredDimension) {
    View view = recycler.getViewForPosition(position);
    if (view != null) {
        RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
        int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
                getPaddingLeft() + getPaddingRight(), p.width);
        int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
                getPaddingTop() + getPaddingBottom(), p.height);
        view.measure(childWidthSpec, childHeightSpec);
        measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
        measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
        recycler.recycleView(view);
    }
}
}

https://github.com/emanuelet/LayoutManagers/blob/master/ExpansiveLayoutManager.java

Answer 2

You don't have to use NestedScrollView. Just leave LinearLayout there.

Answer 3

You do not need to put your recyclerView inside NestedScrollView.

<android.support.v7.widget.RecyclerView
     android:id="@+id/recycler_movie_suggestion"
     app:layout_behavior="@string/appbar_scrolling_view_behavior"
     android:layout_width="match_parent"
     android:layout_height="170dp" />

Answer 4

This is most common issue while using recyclerview inside nestedscrollview.

I have fixed this by adding following lines into xml.

<android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view_comments"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:nestedScrollingEnabled="false"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />

Answer 5

You need to disable nested scrolling programatically. It doesn't seem to work correctly if done in xml.

recyclerView.setNestedScrollingEnabled(false);