MainActivity.java

package com.android.recyclerviewdemo;

import android.graphics.drawable.GradientDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.OrientationHelper;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;

public class MainActivity extends AppCompatActivity {
    RecyclerView mRecyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setLayoutManager(new GridLayoutManager(this,2));
        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, OrientationHelper.VERTICAL));

        mRecyclerView.setAdapter(new NormalReyclerViewAdapter(this));
    }
}