MainActivity.java

package com.example.testrecycleview;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SimpleAdapter;



public class MainActivity extends Activity {
	private RecyclerView rv;
	
	private List<String> mDatas ;
	
	private MyAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initDatas();
        initViews();
        adapter = new MyAdapter(this,mDatas);
        rv.setAdapter(adapter);
        LinearLayoutManager manager =new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
        rv.setLayoutManager(manager);
        
    }


    private void initViews() {
		rv = (RecyclerView) findViewById(R.id.rv);
		
	}


	private void initDatas() {
		mDatas = new ArrayList<String>();
		for (int i = 'A'; i <='z'; i++) {
			mDatas.add(""+(char)i);
		}
		
	}


	@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {
    	
        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;
        }
        
        
        
    }
}