public class MainActivity extends AppCompatActivity {

    List<WaterDataModel> dbList;
    RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;

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

        // Setting ViewPager for each Tabs
        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
        setupViewPager(viewPager);
        // Set Tabs inside Toolbar
        TabLayout tabs = (TabLayout) findViewById(R.id.tabs);
        tabs.setupWithViewPager(viewPager);


        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Array items = getCachedWaterDataModelItems();


                Intent intent = new Intent(MainActivity.this, WaterActivity.class);
                startActivity(intent);
            }
        });

//        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view_water);


    }

    @Override
    protected void onStart() {
        super.onStart();
        Array items = getCachedWaterDataModelItems();

    }

    Array getCachedWaterDataModelItems() {

//    WaterDataModel getCachedWaterDataModelItem(){
        SharedPreferences appSharedPrefs = PreferenceManager
                .getDefaultSharedPreferences(this.getApplicationContext());
        Gson gson = new Gson();
        String json = appSharedPrefs.getString("cachedWaterDataModelItems", "");
        Array items = gson.fromJson(json, Array.class);
        return  items;
    }



    // Add Fragments to Tabs
    private void setupViewPager(ViewPager viewPager) {
        Adapter adapter = new Adapter(getSupportFragmentManager());
        adapter.addFragment(new GazFile(), "GAZ");
        adapter.addFragment(new ElectricityFile(), "ELECTRICITY");
        adapter.addFragment(new WaterFile(), "WATER");
        viewPager.setAdapter(adapter);
    }

    static class Adapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();

        public Adapter(FragmentManager manager) {
            super(manager);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        }

        @Override
        public int getCount() {
            return mFragmentList.size();
        }

        public void addFragment(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }
    }


}