SampleFollowMe.java

package org.osmdroid.samplefragments.location;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;

import org.osmdroid.R;
import org.osmdroid.samplefragments.BaseSampleFragment;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapView;
import org.osmdroid.views.overlay.ScaleBarOverlay;
import org.osmdroid.views.overlay.compass.CompassOverlay;
import org.osmdroid.views.overlay.compass.InternalCompassOrientationProvider;
import org.osmdroid.views.overlay.gestures.RotationGestureOverlay;
import org.osmdroid.views.overlay.mylocation.GpsMyLocationProvider;
import org.osmdroid.views.overlay.mylocation.MyLocationNewOverlay;

/**
 * Based off the submission from https://github.com/2ndGAB
 *
 * Source: https://github.com/2ndGAB/OSMCenterToMyPosition
 * Created by alex on 6/6/16.
 */
public class SampleFollowMe extends BaseSampleFragment implements LocationListener {


    private MyLocationNewOverlay mLocationOverlay;
    private CompassOverlay mCompassOverlay;
    private ScaleBarOverlay mScaleBarOverlay;
    private RotationGestureOverlay mRotationGestureOverlay;
    protected ImageButton btCenterMap;
    protected ImageButton btFollowMe;
    private LocationManager lm;
    private Location currentLocation = null;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.sample_followme, null);
        mMapView = (MapView) v.findViewById(org.osmdroid.R.id.mapview);

        return v;

    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        //super.onViewCreated(view, savedInstanceState);

        final Context context = this.getActivity();
        final DisplayMetrics dm = context.getResources().getDisplayMetrics();

        this.mCompassOverlay = new CompassOverlay(context, new InternalCompassOrientationProvider(context),
                mMapView);
        this.mLocationOverlay = new MyLocationNewOverlay(new GpsMyLocationProvider(context),
                mMapView);

        mScaleBarOverlay = new ScaleBarOverlay(mMapView);
        mScaleBarOverlay.setCentred(true);
        mScaleBarOverlay.setScaleBarOffset(dm.widthPixels / 2, 10);

        mRotationGestureOverlay = new RotationGestureOverlay(mMapView);
        mRotationGestureOverlay.setEnabled(true);

        mMapView.getController().setZoom(15);
        mMapView.setTilesScaledToDpi(true);
        mMapView.setBuiltInZoomControls(true);
        mMapView.setMultiTouchControls(true);
        mMapView.setFlingEnabled(true);
        mMapView.getOverlays().add(this.mLocationOverlay);
        mMapView.getOverlays().add(this.mCompassOverlay);
        mMapView.getOverlays().add(this.mScaleBarOverlay);

        mLocationOverlay.enableMyLocation();
        mLocationOverlay.enableFollowLocation();
        mLocationOverlay.setOptionsMenuEnabled(true);
        mCompassOverlay.enableCompass();

        btCenterMap = (ImageButton) view.findViewById(R.id.ic_center_map);

        btCenterMap.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i(TAG, "centerMap clicked ");
                if (currentLocation != null) {
                    GeoPoint myPosition = new GeoPoint(currentLocation.getLatitude(), currentLocation.getLongitude());
                    mMapView.getController().animateTo(myPosition);
                }
            }
        });

        btFollowMe = (ImageButton) view.findViewById(R.id.ic_follow_me);

        btFollowMe.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i(TAG, "btFollowMe clicked ");
                if (!mLocationOverlay.isFollowLocationEnabled()) {
                    mLocationOverlay.enableFollowLocation();
                    btFollowMe.setImageResource(R.drawable.ic_follow_me_on);
                } else {
                    mLocationOverlay.disableFollowLocation();
                    btFollowMe.setImageResource(R.drawable.ic_follow_me);
                }
            }
        });

    }

    @Override
    public void onPause() {
        super.onPause();
        try{
            lm.removeUpdates(this);
        }catch (Exception ex){}

        mCompassOverlay.disableCompass();
        mLocationOverlay.disableFollowLocation();
        mLocationOverlay.disableMyLocation();
        mScaleBarOverlay.enableScaleBar();
    }
    @Override
    public void onResume(){
        super.onResume();
        lm = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
        try{
            //this fails on AVD 19s, even with the appcompat check, says no provided named gps is available
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER,0l,0f,this);
        }catch (Exception ex){}

        try{
            lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,0l,0f,this);
        }catch (Exception ex){}

        mLocationOverlay.enableFollowLocation();
        mLocationOverlay.enableMyLocation();
        mScaleBarOverlay.disableScaleBar();
    }
    @Override
    public String getSampleTitle() {
        return "Follow Me";
    }

    @Override
    public void onLocationChanged(Location location) {
        currentLocation=location;
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
    @Override
    public void onDestroyView(){
        super.onDestroyView();
        lm=null;
        currentLocation=null;

        mLocationOverlay=null;
        mCompassOverlay=null;
        mScaleBarOverlay=null;
        mRotationGestureOverlay=null;
        btCenterMap=null;
        btFollowMe=null;
    }
}