Recyclerview decoration in android

Hello friends

If you want add decoration in your recyclerview so follow below steps

Decoration

public class MarginDecoration extends RecyclerView.ItemDecoration {

  private int margin;

  public MarginDecoration(Context context) {

    margin = context.getResources().getDimensionPixelSize(R.dimen.item_margin);

  }

  @Override

  public void getItemOffsets(

      Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {

     outRect.set(margin, margin, margin, margin);

  }

}

Above decoration add margin 

Mainactivity.java

package com.samset.recyclerviewmargindecoration;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.support.v7.widget.AppCompatCheckBox;

import android.support.v7.widget.LinearLayoutManager;

import android.support.v7.widget.RecyclerView;

import android.util.Log;

import android.view.View;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import com.samset.recyclerviewmargindecoration.decoration.ColorFullDecoration;

import com.samset.recyclerviewmargindecoration.decoration.MarginDecoration;

import com.samset.recyclerviewmargindecoration.decoration.VerticalDecoration;

import java.util.ArrayList;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;

    private RadioGroup radioGroup;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        initView();

        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            @Override

            public void onCheckedChanged(RadioGroup radioGroup, int i) {

                View radioButton = radioGroup.findViewById(i);

                int index = radioGroup.indexOfChild(radioButton);

                RadioButton r = (RadioButton) radioGroup.getChildAt(index);

                if (r.getText().toString().equalsIgnoreCase("Simple")) {

                    recyclerView.addItemDecoration(new MarginDecoration(MainActivity.this));

                } else if (r.getText().toString().equalsIgnoreCase("Vertical")) {

                    recyclerView.addItemDecoration(new VerticalDecoration(MainActivity.this));

                } else if (r.getText().toString().equalsIgnoreCase("With Border")) {

                    recyclerView.addItemDecoration(new ColorFullDecoration());

                }

            }

        });

        setRecyclerView();

    }

    private void setRecyclerView() {

        recyclerView.setHasFixedSize(true);

        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        recyclerView.setAdapter(new DecorateAdapter(getList()));

    }

    private List<String> getList() {

        List<String> lists = new ArrayList<String>();

        for (int i = 0; i < 50; ++i) {

            lists.add("Item " + String.valueOf(i));

        }

        return lists;

    }

    private void initView() {

        radioGroup = findViewById(R.id.rg);

        recyclerView = (RecyclerView) findViewById(R.id.recyclerview);

    }

}

activitymain.xml

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

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context="com.samset.recyclerviewmargindecoration.MainActivity">

    <LinearLayout

        android:id="@+id/parent"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal"

        android:padding="5dp"

        app:layout_constraintLeft_toLeftOf="parent"

        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent">

        <RadioGroup

            android:id="@+id/rg"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content">

            <RadioButton

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="Simple" />

            <RadioButton

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="Vertical" />

            <RadioButton

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="With Border" />

        </RadioGroup>

    </LinearLayout>

    <android.support.v7.widget.RecyclerView

        android:id="@+id/recyclerview"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        app:layout_constraintTop_toBottomOf="@+id/parent" />

</android.support.constraint.ConstraintLayout>

Thank you 

Enjoy 

See full sorce code

See live sample