NestedScrollview won't start from top

I had the same problem, and I fixed it the following way.

Add android:descendantFocusability="blocksDescendants" to the Linear Layout which is the only child of the Nested Scroll View.

This allows the Nested Scroll View to start from the top with minimal change to code.

It is a problem about focus. Try :

findViewById(R.id.recycler_view).setFocusable(false);
findViewById(R.id.temp).requestFocus();

---

<?xml version="1.0" encoding="utf-8"?>
    <android.support.v4.widget.NestedScrollView
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/home_layout_background">

    <LinearLayout
        android:id="@+id/temp"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

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

            <com.daimajia.slider.library.SliderLayout
                android:id="@+id/image_slider"
                android:layout_width="match_parent"
                android:layout_height="@dimen/image_slider_height"
                android:layout_marginTop="@dimen/image_slider_top_margin" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/popular_fragment_side_padding"
            android:layout_marginRight="@dimen/popular_fragment_side_padding"
            android:layout_marginTop="@dimen/popular_fragment_side_padding"
            android:orientation="horizontal"
            android:weightSum="4">

            <RelativeLayout
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1">

                <RelativeLayout
                    android:id="@+id/free_delivery"
                    android:layout_width="76dp"
                    android:layout_height="76dp"
                    android:layout_centerInParent="true"
                    android:background="@color/white">

                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_centerInParent="true">

                        <ImageView
                            android:id="@+id/btnImageViewFreeDelivery"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerHorizontal="true"
                            android:background="@drawable/icon_free_delivery" />

                        <TextView
                            android:id="@+id/btnTextFreeDelivery"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@+id/btnImageViewFreeDelivery"
                            android:layout_centerHorizontal="true"
                            android:layout_marginTop="2dp"
                            android:text="@string/free_delivery_txt"
                            android:textColor="@color/popular_fragment_four_btn_txt"
                            android:textSize="@dimen/popular_fragment_four_btn_txt_size" />
                    </RelativeLayout>

                </RelativeLayout>

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1">

                <RelativeLayout
                    android:id="@+id/flash_deals"
                    android:layout_width="76dp"
                    android:layout_height="76dp"
                    android:layout_centerInParent="true"
                    android:background="@color/white">


                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_centerInParent="true">

                        <ImageView
                            android:id="@+id/btnImageViewFlashDeals"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerHorizontal="true"
                            android:background="@drawable/icon_flash_deals" />

                        <TextView
                            android:id="@+id/btnTextFlashDeals"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@+id/btnImageViewFlashDeals"
                            android:layout_centerHorizontal="true"
                            android:layout_marginTop="2dp"
                            android:text="@string/flash_deals_txt"
                            android:textColor="@color/popular_fragment_four_btn_txt"
                            android:textSize="@dimen/popular_fragment_four_btn_txt_size" />
                    </RelativeLayout>

                </RelativeLayout>

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1">

                <RelativeLayout
                    android:id="@+id/for_you"
                    android:layout_width="76dp"
                    android:layout_height="76dp"
                    android:layout_centerInParent="true"
                    android:background="@color/white">

                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_centerInParent="true">

                        <ImageView
                            android:id="@+id/btnImageViewForYou"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerHorizontal="true"
                            android:background="@drawable/icon_for_you" />

                        <TextView
                            android:id="@+id/btnTextForYou"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@+id/btnImageViewForYou"
                            android:layout_centerHorizontal="true"
                            android:layout_marginTop="2dp"
                            android:text="@string/for_you_txt"
                            android:textColor="@color/popular_fragment_four_btn_txt"
                            android:textSize="@dimen/popular_fragment_four_btn_txt_size" />
                    </RelativeLayout>


                </RelativeLayout>
            </RelativeLayout>

            <RelativeLayout
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1">

                <RelativeLayout
                    android:id="@+id/shake_deals"
                    android:layout_width="76dp"
                    android:layout_height="76dp"
                    android:layout_centerInParent="true"
                    android:background="@color/white">

                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_centerInParent="true">

                        <ImageView
                            android:id="@+id/btnImageViewShakeDeals"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerHorizontal="true"
                            android:background="@drawable/icon_shake_deals" />

                        <TextView
                            android:id="@+id/btnTextShakeDeals"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_below="@+id/btnImageViewShakeDeals"
                            android:layout_centerHorizontal="true"
                            android:layout_marginTop="2dp"
                            android:text="@string/shake_deals"
                            android:textColor="@color/popular_fragment_four_btn_txt"
                            android:textSize="@dimen/popular_fragment_four_btn_txt_size" />
                    </RelativeLayout>

                </RelativeLayout>
            </RelativeLayout>
        </LinearLayout>

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:focusable="false"
            android:focusableInTouchMode="false"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="@dimen/popular_fragment_side_padding"
            android:layout_marginRight="@dimen/popular_fragment_side_padding"
            android:layout_marginTop="18dp"
            android:scrollbars="none" />

    </LinearLayout>

    </android.support.v4.widget.NestedScrollView>

Just add this line to child of NestedScrollView in xml:

android:focusableInTouchMode="true"