hostage/src/de/tudarmstadt/informatik/hostage/ui2/fragment/ThreatMapFragment.java

package de.tudarmstadt.informatik.hostage.ui2.fragment;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.Fragment;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.view.InflateException;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import java.util.ArrayList;

import de.tudarmstadt.informatik.hostage.R;
import de.tudarmstadt.informatik.hostage.logging.Record;
import de.tudarmstadt.informatik.hostage.logging.UglyDbHelper;

import static com.google.android.gms.common.GooglePlayServicesUtil.*;

/**
 * Created by fabio on 10.02.14.
 */
public class ThreatMapFragment extends Fragment {
	private GoogleMap map = null;
	private static View view = null;

	private UglyDbHelper dbh;

	/**
	 * if google play services aren't available an error notification will be displayed
	 *
	 * @return true if the google play services are available
	 */
	private boolean isGooglePlay() {
		int status = isGooglePlayServicesAvailable(getActivity());
		boolean result = status == ConnectionResult.SUCCESS;
		if (result == false) {
			getErrorDialog(status, getActivity(), 10).show();
		}
		return result;
	}

	private void loadMapFragment() {
		// Get a handle to the Map Fragment
		MapFragment mapFragment = (MapFragment) getFragmentManager()
				.findFragmentById(R.id.threatmapfragment);
		map = mapFragment.getMap();

		dbh = new UglyDbHelper(getActivity());
		ArrayList<Record> records = dbh.getAllRecords();

		CircleOptions circleOptions = new CircleOptions().radius(200.0).fillColor(Color.argb(127, 240, 80, 60)).strokeWidth(0.0f);
		for (Record record : records) {
			LatLng location = new LatLng(record.getLatitude(), record.getLongitude());
			map.addCircle(circleOptions.center(location));
		}

		LatLng tudarmstadt = new LatLng(49.86923, 8.6632768);
		//LatLng mapCenter = new LatLng(41.889, -87.622);
		map.moveCamera(CameraUpdateFactory.newLatLngZoom(tudarmstadt, 13));
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	                         Bundle savedInstanceState) {
		super.onCreateView(inflater, container, savedInstanceState);
		if (view != null) {
			ViewGroup parent = (ViewGroup) view.getParent();
			if (parent != null)
				parent.removeView(view);
		}
		try {
			view = inflater.inflate(R.layout.fragment_threatmap, container, false);
		} catch (InflateException e) {
        /* map is already there, just return view as it is */
		}

		if (isGooglePlay()) {
			loadMapFragment();
		}

		return view;
	}
}