Animate

View refreshButton = tb.findViewById(R.id.action_refresh);
refreshButton.animate().rotation(100f).setDuration(2000);
RotateAnimation rotate = new RotateAnimation(180, 360, Animation.RELATIVE_TO_SELF,
0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
rotate.setDuration(1000);
rotate.setRepeatCount(Animation.INFINITE);
refreshButton.startAnimation(rotate);

AppDatabase

package com.example.android.rssfeedlibrary;


import android.arch.persistence.room.Database;
import android.arch.persistence.room.Room;
import android.arch.persistence.room.RoomDatabase;
import android.content.Context;

@Database(entities = {RssItem.class
}, version = 1, exportSchema = false)
public abstract class AppDatabase extends RoomDatabase {

    private static AppDatabase INSTANCE;

    public abstract RssItemDao rssItemDao();

    public static AppDatabase getDatabase(Context context) {
        if (INSTANCE == null) {
            INSTANCE =
                    Room.databaseBuilder(context, AppDatabase.class, "rssitems")
//Room.inMemoryDatabaseBuilder(context.getApplicationContext(), AppDatabase.class)
                            // To simplify the exercise, allow queries on the main thread.
                            // Don't do this on a real app!
                            .allowMainThreadQueries()
                            // recreate the database if necessary
                            .fallbackToDestructiveMigration()
                            .build();
        }
        return INSTANCE;
    }

    public static void destroyInstance() {
        INSTANCE = null;
    }
}

Gradle

api 'android.arch.lifecycle:extensions:1.0.0-alpha9'
    api 'android.arch.persistence.room:runtime:1.0.0-alpha9'
    annotationProcessor 'android.arch.lifecycle:compiler:1.0.0-alpha9'
    annotationProcessor 'android.arch.persistence.room:compiler:1.0.0-alpha9'
 

MyListFragment

// ADJUST THE FRAGMENT

public class MyListFragment extends Fragment implements LifecycleRegistryOwner {

    LifecycleRegistry lifecycleRegistry = new LifecycleRegistry(this);

    @Override
    public LifecycleRegistry getLifecycle() {
        return lifecycleRegistry;
    }

RssItemDao

package com.example.android.rssfeedlibrary;

import android.arch.lifecycle.LiveData;
import android.arch.persistence.room.Dao;
import android.arch.persistence.room.Insert;
import android.arch.persistence.room.OnConflictStrategy;
import android.arch.persistence.room.Query;

import java.util.List;

@Dao
public interface RssItemDao {
	@Insert(onConflict = OnConflictStrategy.REPLACE)
	void addItem(RssItem item);

	@Insert(onConflict = OnConflictStrategy.REPLACE)
	void addItems(List<RssItem> item);

	@Query("select * from rssitem")
	public LiveData<List<RssItem>> getAllRssItems();

	@Query("select * from rssitem where id =:id")
	public LiveData<RssItem> getRssItems(long id);

	@Query("delete from rssitem")
	void removeAllRssItems();
}