Set Map Spatial Reference

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# Set Map Spatial Reference
Create a map with a specific spatial reference.

![Set Map Spatial Reference App](set-map-spatial-reference.png)

## How to use the sample
Simply run the app.

## How it works
1. Create a `MapView`.
1. Create an `ArcGISMap` passing a specific `SpatialReference` as an argument.

NOTE: Not all layer types can be reprojected, like `ArcGISTiledLayer`, which will fail to draw if their spatial reference is not the same as the `ArcGISMap`'s spatial reference.

## Relevant API
* ArcGISMap
* ArcGISMapImageLayer
* MapView
* SpatialReference

#### Tags
Maps and Scenes

Code

/* Copyright 2016 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.sample.mapspatialreference;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import com.esri.arcgisruntime.geometry.SpatialReference;
import com.esri.arcgisruntime.layers.ArcGISMapImageLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
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);

    // get a reference to the map view
    mMapView = findViewById(R.id.mapView);

    // create a map with World_Bonne projection
    ArcGISMap map = new ArcGISMap(SpatialReference.create(54024));

    //Adding a map image layer which can re-project itself to the map's spatial reference
    ArcGISMapImageLayer mapImageLayer = new ArcGISMapImageLayer(getString(R.string.world_cities_service));

    // set the map image layer as basemap
    Basemap basemap = new Basemap(mapImageLayer);

    // add the basemap to the map
    map.setBasemap(basemap);

    // set the map to be displayed in this view
    mMapView.setMap(map);
  }

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

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

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