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What is RecyclerView?

RecyclerView is a ViewGroup in Android used to efficiently display large sets of data in the form of a list or grid.�It’s an improved version of ListView, offering better performance and more flexibility.
RecyclerView works together with Adapter and LayoutManager to display data efficiently.

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How RecyclerView Works�RecyclerView operates through three main components:

Component	Function
RecyclerView	The main container where data items are displayed.
Adapter	Binds the data to the individual views (items) in the RecyclerView.
ViewHolder	Holds the references to the item’s views for efficient reuse.

The term “Recycle” means that RecyclerView reuses the views that have scrolled off-screen instead of creating new ones, improving performance and reducing memory use.

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Steps to Create a RecyclerView� Step 1: Add RecyclerView to your layout

<androidx.recyclerview.widget.RecyclerView android:id="@+id/recyclerView" android:layout_width="match_parent" android:layout_height="match_parent" �android:padding="8dp"/>

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Step 2: Create a model class�You need a model class to represent the data to be displayed.

public class Student {

String name;

int age;

public Student(String name, int age) {

this.name = name;

this.age = age;

}

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Step 3: Create a Custom Adapter�The Adapter connects your data with the RecyclerView items using a ViewHolder.

public class StudentAdapter extends RecyclerView.Adapter<StudentAdapter.StudentViewHolder> {

private List<Student> studentList;

public StudentAdapter(List<Student> studentList) {

this.studentList = studentList;

}

static class StudentViewHolder extends RecyclerView.ViewHolder {

public StudentViewHolder(@NonNull View itemView) {

super(itemView);

}

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�

4. About the ViewHolder Class

ViewHolder is a class that stores references to the views for each item in the RecyclerView.�Its main purpose is to improve performance by reusing existing views instead of creating new ones each time.

For example:

Using findViewById() repeatedly is slow.
ViewHolder caches the views once and reuses them, making scrolling smooth and efficient.

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Type	Description
Default Adapter	Uses predefined data structures like ArrayAdapter or SimpleAdapter.
Custom Adapter	Designed by the developer for custom layouts, models, and logic. Provides full flexibility.

Difference Between Adapter and Custom Adapter

With a Custom Adapter, you can include Buttons, ImageViews, Switches, SeekBars, and attach onClick listeners for each item.

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4-bosqich: Item layout fayl yaratish (item_student.xml)�5-bosqich: MainActivity’da RecyclerView’ni sozlash

recyclerView = findViewById(R.id.recyclerView);

recyclerView.setLayoutManager(new LinearLayoutManager(this));

studentList = new ArrayList<>();

studentList.add(new Student("Ali", 20));

studentList.add(new Student("Laylo", 22));

studentList.add(new Student("Javohir", 19));

adapter = new StudentAdapter(studentList);

recyclerView.setAdapter(adapter);

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Types of LayoutManager

RecyclerView uses LayoutManager to define how items are arranged:

LayoutManager	Description
LinearLayoutManager	Displays items vertically or horizontally (like a list).
GridLayoutManager	Displays items in a grid layout (like a table).
StaggeredGridLayoutManager	Displays items in uneven grid style (like Pinterest).

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