OfflineBannerFragment.java

package mil.nga.giat.asam.connectivity;

import mil.nga.giat.asam.R;
import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class OfflineBannerFragment extends Fragment implements View.OnClickListener, NetworkChangeReceiver.ConnectivityEventListener {

    public interface OnOfflineBannerClick {
        public void onOfflineBannerClick();
    }
    
	private View alertBanner;
	private Button alertBannerButton;
	private OnOfflineBannerClick onOfflineBannerClickListener;
   
	@Override
	public void onResume() {
		super.onResume();
		
		NetworkChangeReceiver.getInstance().addListener(this);
	}
	
	@Override
	public void onPause() {
		super.onPause();
		
        NetworkChangeReceiver.getInstance().removeListener(this);
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
	    boolean isTablet = getResources().getBoolean(R.bool.is_tablet);
	    int layout = isTablet ? R.layout.fragment_alert_banner_top : R.layout.fragment_alert_banner_bottom;
		return inflater.inflate(layout, container, false);
	}

   @Override
   public void onAttach(Activity activity) {
       super.onAttach(activity);
       try {
           onOfflineBannerClickListener = (OnOfflineBannerClick) activity;
       }
       catch (ClassCastException caught) {
           throw new ClassCastException(activity.toString() + " must implement OnOfflineBannerClick");
       }
   }
   
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		alertBanner = getActivity().findViewById(R.id.alert_banner);
		alertBannerButton = (Button) getActivity().findViewById(R.id.alert_banner_button);
		alertBannerButton.setOnClickListener(this);

		if (isOnline(getActivity().getApplicationContext())) {
	          alertBanner.setVisibility(View.GONE);
		} else {
	          alertBanner.setVisibility(View.VISIBLE);
		}

		super.onActivityCreated(savedInstanceState);
	}
	
    @Override
    public void onClick(View v) {
        onOfflineBannerClickListener.onOfflineBannerClick();
    }

    @Override
    public void onAllDisconnected() {
        getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                alertBanner.setVisibility(View.VISIBLE);
            }
        });
    }

    @Override
    public void onAnyConnected() {
        getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                alertBanner.setVisibility(View.GONE);
            }
        });
    }
    
    private boolean isOnline(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netInfo = cm.getActiveNetworkInfo();
        if (netInfo != null && netInfo.isConnectedOrConnecting()) {
            return true;
        }
        return false;
    }
}