RecycleView Android

activity_main layout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 

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

 android:layout_width="match_parent" 

 android:layout_height="match_parent"     

tools:context=".MainActivity">

    <android.support.v7.widget.RecyclerView 

 android:id="@+id/list" 

 android:layout_width="match_parent" 

 android:layout_height="match_parent" 

 android:clipToPadding="false" 

 android:paddingBottom="80dp" 

 android:scrollbars="vertical" />
</RelativeLayout>

content_main layout

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

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 

 android:layout_width="match_parent" 

 android:layout_height="wrap_content" 

 android:orientation="vertical">

    <TextView 

 android:id="@+id/textView" 

 android:layout_width="match_parent" 

 android:layout_height="wrap_content" 

 android:layout_marginBottom="8dp" 

 android:layout_marginLeft="12dp" 

 android:layout_marginRight="12dp" 

 android:layout_marginTop="8dp" 

 android:textSize="22sp" />
</LinearLayout>

RecyclerViewAdapter class 

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
    private Context mContext;
    private String[] mList;

    public RecyclerViewAdapter(Context contexts, String[] list) {
        this.mContext = contexts;
        this.mList = list;
    }

    @Override 

 public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View itemView = inflater.inflate(R.layout.content_main, parent, false);
        return new ViewHolder(itemView);
    }

    @Override 

 public void onBindViewHolder(ViewHolder holder, int position) {
        holder.titleTextView.setText(mList[position]);
        // setonclick here 

            holder.setClickListener(new ItemClickListener() {
            @Override 

              public void onClick(View view, int position, boolean isLongClick) {
                if (isLongClick)
                    Toast.makeText(mContext, "pos:" + position + " isLongClick", Toast.LENGTH_SHORT).show();
                else 

                    Toast.makeText(mContext, "pos:" + position, Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override 

 public int getItemCount() {
        return mList.length;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder
            implements View.OnClickListener, View.OnLongClickListener {
        private TextView titleTextView;
        private ItemClickListener clickListener;

        public ViewHolder(View itemView) {
            super(itemView);
            titleTextView = (TextView) itemView.findViewById(R.id.textView);
            itemView.setTag(itemView);
            itemView.setOnClickListener(this);
            itemView.setOnLongClickListener(this);
        }

        public void setClickListener(ItemClickListener itemClickListener) {
            this.clickListener = itemClickListener;
        }

        @Override 

 public void onClick(View view) {
            clickListener.onClick(view, getPosition(), false);
        }

        @Override 

 public boolean onLongClick(View view) {
            clickListener.onClick(view, getPosition(), true);
            return true;
        }
    }
}

ItemClickListener interface

public interface ItemClickListener {
    void onClick(View view, int position, boolean isLongClick);
} 

MainActivity class

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    private StaggeredGridLayoutManager mGridLayoutManager;
    private RecyclerViewAdapter mAdapter;
    private String[] mList = {"a", "b", "c", "d", "e", "f"};

    @Override 

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRecyclerView = (RecyclerView) findViewById(R.id.list);
        mGridLayoutManager = new StaggeredGridLayoutManager(1, StaggeredGridLayoutManager.VERTICAL);
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());
        mRecyclerView.setLayoutManager(mGridLayoutManager);
        mAdapter = new RecyclerViewAdapter(getApplicationContext(), mList);
        mRecyclerView.setAdapter(mAdapter);
    }

    @Override 

     public boolean onCreateOptionsMenu(Menu menu) {

     getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override 

    public boolean onOptionsItemSelected(MenuItem item) {

          int id = item.getItemId();

           if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}