Android Open Source - iLitIt_Android Heat Map Fragment

From Project

Back to project page iLitIt_Android.
License

The source code is released under:
GNU General Public License
If you think the Android project iLitIt_Android listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package de.unifreiburg.es.iLitIt;
// w  w  w  . j  a v  a2s . c  o  m
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.maps.model.TileOverlay;
import com.google.android.gms.maps.model.TileOverlayOptions;
import com.google.maps.android.heatmaps.HeatmapTileProvider;

import java.util.ArrayList;

/**
 * Created by phil on 11/26/14.
 */
public class HeatMapFragment extends SupportMapFragment implements MainActivity.MyFragment {
    private static final String TAG = HeatMapFragment.class.getCanonicalName();
    private static GoogleMap mMap;
    private HeatmapTileProvider mProvider;
    private TileOverlay mOverlay;
    private ObservableLinkedList<CigaretteEvent> mModel;

    DelayedObserver rUpdateView = new DelayedObserver(500, new Runnable() {
        @Override
        public void run() {
            ArrayList<LatLng> latlng = new ArrayList<LatLng>();
            for (CigaretteEvent e : mModel)
                if (e.where != null)
                    latlng.add(new LatLng(e.where.getLatitude(), e.where.getLongitude()));

            if (latlng.size() == 0) {
                if (mProvider!=null) {
                    mOverlay.remove();
                    mProvider=null;
                }

                return;
            }

            if (mMap == null)
                return;

            if (mProvider == null) {
                mProvider = new HeatmapTileProvider.Builder().data(latlng).build();
                mOverlay = mMap.addTileOverlay(new TileOverlayOptions().tileProvider(mProvider));
            } else {
                mProvider.setData(latlng);
            }

            mOverlay.clearTileCache();
        }
    });

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = super.onCreateView(inflater, container, savedInstanceState);

        if (getMap()!=null)
            mMap = getMap();

        mMap.setPadding(40, 0, 40, 0);
        mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
            @Override
            public void onMapLongClick(LatLng latLng) {
                focusOnModel();
            }
        });
        mMap.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {
            @Override
            public void onMapLoaded() {
                focusOnModel();
                rUpdateView.mAction.run();
            }
        });
        return v;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mModel != null) mModel.unregister(rUpdateView);
    }

    public void focusOnModel() {
        double max_lat = Double.NEGATIVE_INFINITY, max_lon = Double.NEGATIVE_INFINITY,
               min_lat = Double.POSITIVE_INFINITY, min_lon = Double.POSITIVE_INFINITY;

        if (mModel == null)
            return;

        for (CigaretteEvent e : mModel) {
            if (e.where == null)
                continue;

            double lat = e.where.getLatitude(),
                   lon = e.where.getLongitude();

            Log.d(TAG, "lat: " + lat + " lon: " + lon);

            if (lat > max_lat) max_lat = lat;
            if (lat < min_lat) min_lat = lat;
            if (lon > max_lon) max_lon = lon;
            if (lon < min_lon) min_lon = lon;
        }

        try {
            LatLng sw = new LatLng(min_lat, min_lon),
                    ne = new LatLng(max_lat, max_lon);

            Log.d(TAG, "sw: " + sw.toString() + " ne: " + ne.toString());

            mMap.animateCamera(
                    CameraUpdateFactory.newLatLngBounds(new LatLngBounds(sw, ne), 150));
        } catch(IllegalArgumentException e) {
            Log.d(TAG, "positions for events not known yet");
        }
    }

    @Override
    public void setModel(ObservableLinkedList<CigaretteEvent> cigaretteEvents) {
        if (mModel != null) {
            mModel.unregister(rUpdateView);
        }

        mModel = cigaretteEvents;
        mModel.register(rUpdateView);
    }

    @Override
    public void setBluetoothService(LighterBluetoothService service) {

    }
}
Java Source Code List
