Raster layer (file)

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Sample viewer app

Create and use a raster layer made from a local raster file.

Image of raster layer file

Use case

Rasters can be digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps. An end-user will frequently need to import raster files acquired through various data-collection methods into their map to view and analyze the data.

How to use the sample

When the sample starts, a raster will be loaded from a file and displayed in the map view.

How it works

  1. Create a Raster from a raster file.
  2. Create a RasterLayer from the raster.
  3. Add it as an operational layer with map.operationalLayers.add(rasterLayer).

Relevant API

  • Raster
  • RasterLayer

Additional information

See the topic What is raster data? in the ArcMap documentation for more information about raster images.

Offline Data

  1. Download the data from ArcGIS Online.
  2. Extract the contents of the downloaded zip file to disk.
  3. Open your command prompt and navigate to the folder where you extracted the contents of the data from step 1.
  4. Push the data into the scoped storage of the sample app:

adb push raster-file /Android/data/com.esri.arcgisruntime.sample.rasterlayerfile/files/raster-file

Tags

data, image, import, layer, raster, visualization

Sample Code

MainActivity.kt
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/* Copyright 2020 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.rasterlayerfile

import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
import com.esri.arcgisruntime.layers.RasterLayer
import com.esri.arcgisruntime.loadable.LoadStatus
import com.esri.arcgisruntime.mapping.ArcGISMap
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.view.MapView
import com.esri.arcgisruntime.raster.Raster
import com.esri.arcgisruntime.sample.rasterlayerfile.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private val TAG = MainActivity::class.java.simpleName

    private val activityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    private val mapView: MapView by lazy {
        activityMainBinding.mapView
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(activityMainBinding.root)

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

        // create a map with imagery basemap
        val map = ArcGISMap(BasemapStyle.ARCGIS_IMAGERY)
        // add the map to a map view
        mapView.map = map
        // create a raster from a local raster filepath
        val raster = Raster(getExternalFilesDir(null)?.path + getString(R.string.raster_file_path))
        // create a raster layer
        val rasterLayer = RasterLayer(raster)
        // add the raster as an operational layer
        map.operationalLayers.add(rasterLayer)
        // set viewpoint on the raster
        rasterLayer.addDoneLoadingListener {
            if (rasterLayer.loadStatus == LoadStatus.LOADED) {
                mapView.setViewpointGeometryAsync(
                    rasterLayer.fullExtent,
                    50.0
                )
            } else {
                Log.e(TAG, "Error loading raster layer: ${rasterLayer.loadError.message}")
                Toast.makeText(this, "Failed to load raster file from storage", Toast.LENGTH_LONG)
                    .show()
            }
        }
    }

    override fun onPause() {
        mapView.pause()
        super.onPause()
    }

    override fun onResume() {
        super.onResume()
        mapView.resume()
    }

    override fun onDestroy() {
        mapView.dispose()
        super.onDestroy()
    }
}

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