platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/activity/style/GridSourceActivity.java


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package com.mapbox.mapboxsdk.testapp.activity.style;

import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;

import com.mapbox.mapboxsdk.geometry.LatLngBounds;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.style.layers.LineLayer;
import com.mapbox.mapboxsdk.style.sources.CustomVectorSource;
import com.mapbox.mapboxsdk.style.sources.TileProvider;
import com.mapbox.mapboxsdk.testapp.R;
import com.mapbox.services.commons.geojson.Feature;
import com.mapbox.services.commons.geojson.FeatureCollection;
import com.mapbox.services.commons.geojson.GeoJSON;
import com.mapbox.services.commons.geojson.LineString;

import java.util.ArrayList;
import java.util.List;

import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineColor;
import static com.mapbox.mapboxsdk.testapp.R.string.zoom;

public class GridSourceActivity extends AppCompatActivity implements OnMapReadyCallback {

  private static final String ID_GRID_SOURCE = "grid_source";
  private static final String ID_GRID_LAYER = "grid_layer";

  private MapView mapView;
  private MapboxMap mapboxMap;
  private CustomVectorSource source;

  class GridProvider implements TileProvider {
    public FeatureCollection getFeaturesForBounds(LatLngBounds bounds, int zoom) {
      List<Feature> features = new ArrayList<>();
      double gridSpacing;
      if(zoom >= 13) {
        gridSpacing = 0.01;
      } else if(zoom >= 11) {
        gridSpacing = 0.05;
      } else if(zoom == 10) {
        gridSpacing = .1;
      } else if(zoom == 9) {
        gridSpacing = 0.25;
      } else if(zoom == 8) {
        gridSpacing = 0.5;
      } else if (zoom >= 6) {
        gridSpacing = 1;
      } else if(zoom == 5) {
        gridSpacing = 2;
      } else if(zoom >= 4) {
        gridSpacing = 5;
      } else if(zoom == 2) {
        gridSpacing = 10;
      } else {
        gridSpacing = 20;
      }
      for (double y = Math.ceil(bounds.getLatNorth() / gridSpacing) * gridSpacing; y >= Math.floor(bounds.getLatSouth() / gridSpacing) * gridSpacing; y -= gridSpacing) {
        LineString gridLine = LineString.fromCoordinates(new double[][]{ new double []{bounds.getLonWest(), y}, new double[]{bounds.getLonEast(), y}});
        features.add(Feature.fromGeometry(gridLine));
      }

      for (double x = Math.floor(bounds.getLonWest() / gridSpacing) * gridSpacing; x <= Math.ceil(bounds.getLonEast() / gridSpacing) * gridSpacing; x += gridSpacing) {
        LineString gridLine = LineString.fromCoordinates(new double[][]{new double[]{x, bounds.getLatSouth()}, new double[] {x, bounds.getLatNorth()}});
        features.add(Feature.fromGeometry(gridLine));
      }
      return FeatureCollection.fromFeatures(features);
    }
  }
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_grid_source);

    mapView = (MapView) findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(this);
  }

  @Override
  public void onMapReady(@NonNull final MapboxMap map) {
    mapboxMap = map;
    map.setDebugActive(true);
    new Handler(getMainLooper()).post(new Runnable() {
      @Override
      public void run() {
        // add source
        source = new CustomVectorSource(ID_GRID_SOURCE, new GridProvider());
        mapboxMap.addSource(source);

        // add layer
        LineLayer layer = new LineLayer(ID_GRID_LAYER, ID_GRID_SOURCE);
        layer.setProperties(
            lineColor(Color.parseColor("#000000"))
        );

        mapboxMap.addLayer(layer);
      }
    });

  }

  @Override
  protected void onStart() {
    super.onStart();
    mapView.onStart();
  }

  @Override
  public void onResume() {
    super.onResume();
    mapView.onResume();
  }

  @Override
  public void onPause() {
    super.onPause();
    mapView.onPause();
  }

  @Override
  protected void onStop() {
    super.onStop();
    mapView.onStop();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mapView.onSaveInstanceState(outState);
  }

}