Set min max scale

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Restrict zooming between specific scale ranges.

Image of min max scale

Use case

Data may only appear at a certain scale on a map, and may be visually lost if zooming too far in or out. Setting the minimum and maximum scales ensures the zoom extents are appropriately limited for the purposes of the map.

How to use the sample

Zoom in and out of the map. The zoom extents of the map are limited between the given minimum and maximum scales.

How it works

  1. Instantiate an ArcGISMap object.
  2. Set min and max scales of map with setMaxScale() and setMinScale().
  3. Set the map to a MapView object.

Relevant API

  • ArcGISMap
  • BasemapStyle
  • MapView
  • ViewPoint

Tags

area of interest, level of detail, maximum, minimum, scale, viewpoint

Sample Code

MainActivity.java
                                                                             
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/*
 * Copyright 2019 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgisruntime.samples.setminxmaxscale;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;

public class MainActivity extends AppCompatActivity {

  private MapView mMapView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // authentication with an API key or named user is required to access basemaps and other
    // location services
    ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);

    mMapView = findViewById(R.id.mapView);

    // create a ArcGISMap with basemap streets
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_STREETS);

    // set the scale at which this layer can be viewed
    map.setMinScale(8000);
    map.setMaxScale(2000);

    // create a view for this ArcGISMap and set ArcGISMap to it
    mMapView.setMap(map);
    // a point where the map view will focus and zoom to
    mMapView.setViewpoint(new Viewpoint(new Point(-355453, 7548720, SpatialReferences.getWebMercator()), 3000));
  }

  @Override
  protected void onPause() {
    mMapView.pause();
    super.onPause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

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

}

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