android - Recyclerview inside nested scroll view loading all datas instead of calling one by one image when scroll

Question

In my application, I'm using tabHost Activiy.In the tabhost first tab,I'm using TabActivity,I'm loading more than 500 images.

Using Nested SCroll view:

I have used nested scroll view inside recyclerview.When loading the home page, it is loading all 500 images initially, then showing the home page.So that it cause memory out of error.

Without using nested SCroll view:

If I remove nested scroll view, everything is working good.it loads image one by one when scrolling.it doesn't cause out of memory error.

My Requirement:

I need to scroll the relative layout placed top of the recyclerview.So that I used nested scroll view.But it doesn't worked for me.

tab_home_layout:

<?xml version="1.0" encoding="utf-8"?>

<android.support.v4.widget.NestedScrollView
        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"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
     >

<LinearLayout
    android:id="@+id/tab_home_activity"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

        <RelativeLayout
            android:id="@+id/home_layout_top_2_recycler"
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:background="@drawable/layout_border"
            >

            <ImageView
                android:id="@+id/img_user_home_tab_recycler"
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:paddingLeft="5dp"
                android:paddingRight="5dp"
                android:layout_centerVertical="true"
                android:contentDescription="@string/cont_desc"
                android:src="@drawable/profile_pic_blue" />

            <TextView
                android:id="@+id/tv_user_mind_home_tab_recycler"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="5dp"
                android:layout_toRightOf="@+id/img_user_home_tab_recycler"
                android:hint="@string/whats_on"
                android:textColor="@color/Black"
                android:textSize="@dimen/txt_size" />
        </RelativeLayout>

    <android.support.v7.widget.RecyclerView
            android:id="@+id/rv_list_tab_home_recycler"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scrollbars="none"
            android:visibility="visible" />

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

Below I'm willing to share what I have tried so far.

• I tried this SO Post.But I'm using home page inside tabActivity.So I can't use toolbar + coordinator layout.So this solution wasn't worked for me.

• Then I tried to use multiple layout for recyclerview.But that doesn't worked for me.Because that relativelayout is a static one.If I'm getting any condition from webservice means, I can use multiple layout recyclerview.But I need to just scroll the views.

• I planned to set the static relativelayout in 0th position of adapter.But my webservices images were loading from 0th position.So I can't set the static relativelayout in adapter at 0th position.

is there any alternate solution to solve this issue.Thank You.

Answer 1

You can use CoordinatorLayout just about anywhere you like similar to other layouts like LinearLayout or even RelativeLayout. If you want your RelativeLayout to scroll in response to your RecyclerView, simply place them inside a CoordinatorLayout with an AppBarLayout. Here's your layout modified:

<android.support.design.widget.CoordinatorLayout
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <RelativeLayout
            android:id="@+id/home_layout_top_2_recycler"
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:background="@drawable/layout_border"
            app:layout_scrollFlags="scroll">

            <ImageView
                android:id="@+id/img_user_home_tab_recycler"
                android:layout_width="40dp"
                android:layout_height="40dp"
                android:paddingLeft="5dp"
                android:paddingRight="5dp"
                android:layout_centerVertical="true"
                android:contentDescription="@string/cont_desc"
                android:src="@drawable/profile_pic_blue" />

            <TextView
                android:id="@+id/tv_user_mind_home_tab_recycler"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginLeft="5dp"
                android:layout_toRightOf="@+id/img_user_home_tab_recycler"
                android:hint="@string/whats_on"
                android:textColor="@color/Black"
                android:textSize="@dimen/txt_size" />
            </RelativeLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_list_tab_home_recycler"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="none"
        android:visibility="visible"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

</android.support.design.widget.CoordinatorLayout>

Change it to your preference but be sure to set the layout_height of the RelativeLayout to something other than wrap_content.

If this CoordinatorLayout is inside another CoordinatorLayout, use the NestedCoordinatorLayout from this answer as your inside CoordinatorLayout.