import android.os.Bundle;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.TabLayout;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;

import com.blackcj.designsupportexample.adapters.RecyclerViewAdapter;

public class MainActivity extends AppCompatActivity implements AppBarLayout.OnOffsetChangedListener {

    private AppBarLayout appBarLayout;
    private TabLayout tabLayout;
    private SwipeRefreshLayout mSwipeRefreshLayout;

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

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler);
        recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
        RecyclerViewAdapter adapter = new RecyclerViewAdapter();
        recyclerView.setAdapter(adapter);

        mSwipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.contentView);
        mSwipeRefreshLayout.setColorSchemeResources(R.color.colorPrimary);
        mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                mSwipeRefreshLayout.setRefreshing(false);
            }
        });

        appBarLayout = (AppBarLayout) findViewById(R.id.appBarLayout);

    }

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int i) {
        if (i == 0) {
            mSwipeRefreshLayout.setEnabled(true);
        } else {
            mSwipeRefreshLayout.setEnabled(false);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        appBarLayout.addOnOffsetChangedListener(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        appBarLayout.removeOnOffsetChangedListener(this);
    }
}