BaseMainFragment.java

package org.rudirect.android.fragment;

import android.app.Fragment;
import android.os.Bundle;
import android.support.design.widget.AppBarLayout;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.View;

import org.rudirect.android.R;
import org.rudirect.android.activity.MainActivity;

public class BaseMainFragment extends Fragment implements AppBarLayout.OnOffsetChangedListener {

    protected SwipeRefreshLayout mSwipeRefreshLayout;
    protected AppBarLayout appBarLayout;
    protected MainActivity mainActivity;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mainActivity = (MainActivity) getActivity();
        setHasOptionsMenu(true);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        appBarLayout = (AppBarLayout) mainActivity.findViewById(R.id.appbar);
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.menu_settings, menu);
    }

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

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

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