TreeDisplay.java

package org.azavea.otm.ui;

import android.app.Activity;
import android.app.FragmentManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

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.OnMapReadyCallback;
import com.google.android.gms.maps.UiSettings;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

import org.azavea.helpers.GoogleMapsListeners;
import org.azavea.helpers.Logger;
import org.azavea.otm.R;
import org.azavea.otm.data.Geometry;
import org.azavea.otm.data.Plot;
import org.json.JSONException;
import org.json.JSONObject;

public class TreeDisplay extends UpEnabledActionBarActivity {
    protected LatLng plotLocation;
    protected Plot plot;
    public static int RESULT_PLOT_DELETED = Activity.RESULT_FIRST_USER + 1;
    public static int RESULT_PLOT_EDITED = Activity.RESULT_FIRST_USER + 2;
    protected static final int DEFAULT_TREE_ZOOM_LEVEL = 18;
    private GoogleMap mMap;
    protected Marker plotMarker;
    protected int mapFragmentId;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        try {
            plot = new Plot(new JSONObject(getIntent().getStringExtra("plot")));
            plotLocation = getPlotLocation(plot);
        } catch (JSONException e) {
            Toast.makeText(this, "Could not retrieve Tree information", Toast.LENGTH_SHORT).show();
            Logger.error("Failed to create tree view", e);
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        MapHelper.checkGooglePlay(this);
    }

    protected LatLng getPlotLocation(Plot plot) {
        try {
            Geometry geom = plot.getGeometry();
            double lon = geom.getX();
            double lat = geom.getY();
            return new LatLng(lat, lon);
        } catch (Exception e) {
            Logger.error("Unable to get plot geometry", e);
            return null;
        }
    }

    protected void showPositionOnMap() {
        onMapLoad(map -> {
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(plotLocation, DEFAULT_TREE_ZOOM_LEVEL));
            if (plotMarker != null) {
                plotMarker.remove();
            }
            plotMarker = map.addMarker(new MarkerOptions().position(plotLocation).title("")
                    .icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_mapmarker)));
        });
    }

    protected void setUpMapIfNeeded() {
        // Do a null check to confirm that we have not already instantiated the
        // map.
        if (mMap == null) {
            onMapLoad(map -> {
                if (map != null) {
                    mMap = map;
                    setUpMap();
                } else {
                    Log.e("VIN", "map was null.");
                }
            });
        }
    }

    protected void onMapLoad(OnMapReadyCallback cb) {
        if (mMap != null) {
            cb.onMapReady(mMap);
        }
        // Try to obtain the map from the MapFragment.
        // we have to try for 2 different fragment id's, using the reasonable
        // assumption that the base classes are going to be instantiated one
        // at a time.
        FragmentManager fragmentManager = getFragmentManager();
        MapFragment fragment = (MapFragment) fragmentManager.findFragmentById(mapFragmentId);
        fragment.getMapAsync(cb);
    }

    private void setUpMap() {
        UiSettings mUiSettings = mMap.getUiSettings();
        mUiSettings.setZoomControlsEnabled(false);
        mUiSettings.setScrollGesturesEnabled(false);
        mUiSettings.setZoomGesturesEnabled(false);
        mUiSettings.setTiltGesturesEnabled(false);
        mUiSettings.setRotateGesturesEnabled(false);
        mMap.setOnMarkerDragListener(new GoogleMapsListeners.NoopDragListener());
    }

    protected void setText(int resourceId, String text) {
        // Only set the text if it exists, letting the layout define default text
        if (text != null && !"".equals(text)) {
            ((TextView) findViewById(resourceId)).setText(text);
        }
    }

}