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NestedScrollView in Android with Example

NestedScrollView is a version of ScrollView that's designed to work with other nested scrolling views (such as RecyclerView or ViewPager) by coordinating the scroll actions between the children and parent views. This becomes particularly useful in situations where you have content that needs to scroll and contain a scrolling component inside it, e.g., a long description text above a RecyclerView.

Steps to Use `NestedScrollView`:

1. Setup Dependencies:

Ensure you have the AndroidX Core library added to your app's dependencies:

implementation 'androidx.core:core-ktx:1.X.X'

2. Create the Layout with `NestedScrollView`:

Here's an example layout with a NestedScrollView that contains a TextView and a RecyclerView:

activity_nested_scroll.xml

<androidx.core.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Long description here..."
            android:padding="16dp" />

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:nestedScrollingEnabled="false" />

    </LinearLayout>

</androidx.core.widget.NestedScrollView>

Here, android:nestedScrollingEnabled="false" on the RecyclerView is essential to make the entire content scroll smoothly.

3. Set up the Activity:

In your activity or fragment, populate the RecyclerView as you typically would:

class NestedScrollActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_nested_scroll)

        val recyclerView: RecyclerView = findViewById(R.id.recyclerView)
        recyclerView.layoutManager = LinearLayoutManager(this)
        recyclerView.adapter = MyAdapter()  // Assume you have a RecyclerView.Adapter named MyAdapter
    }
}

Things to Note:

Performance: Using a RecyclerView inside a NestedScrollView can be less efficient because RecyclerView's recycling mechanism might be hampered. Ensure to test performance, especially with long lists.
Smooth Scrolling: The primary benefit of NestedScrollView is to achieve smooth scrolling and coordinated collapse/expand actions (especially when used with CoordinatorLayout and CollapsingToolbarLayout).
NestedScrollingChild and NestedScrollingParent: These interfaces provided by Android make the nested scrolling magic possible. NestedScrollView implements NestedScrollingParent, and views like RecyclerView implement NestedScrollingChild.

In conclusion, NestedScrollView is a powerful UI component when you need to nest scrolling components. However, always be cautious of its impact on performance, especially with complex layouts.

NestedScrollView Example Code Android:

Description: Demonstrating the use of NestedScrollView in Android to create a scrollable container that can host other scrollable views.

Code:

<!-- activity_main.xml -->
<androidx.core.widget.NestedScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <!-- Your scrollable content goes here -->
</androidx.core.widget.NestedScrollView>

Android NestedScrollView with RecyclerView Example:

Description: Using NestedScrollView to host a RecyclerView for a vertically scrollable list.