ArcGIS Runtime SDK for Android

Raster Layer File

Screenshot of Raster Layer File App

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Code

/* Copyright 2017 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 java.io.File;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

import com.esri.arcgisruntime.layers.RasterLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.raster.Raster;

/**
 * A sample class which demonstrates loading a Raster from the local device.
 */
public class MainActivity extends AppCompatActivity {

  private MapView mMapView;

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

    // retrieve the MapView from layout
    mMapView = (MapView) findViewById(R.id.mapView);

    // define permission to request
    String[] reqPermission = new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE };
    int requestCode = 2;
    // For API level 23+ request permission at runtime
    if (ContextCompat.checkSelfPermission(MainActivity.this,
        reqPermission[0]) == PackageManager.PERMISSION_GRANTED) {
      loadRaster();
    } else {
      // request permission
      ActivityCompat.requestPermissions(MainActivity.this, reqPermission, requestCode);
    }
  }

  /**
   * Using values stored in strings.xml, builds path to Shasta.tif.
   *
   * @return the path to raster file
   */
  private String buildRasterPath() {
    // get sdcard resource name
    File extStorDir = Environment.getExternalStorageDirectory();
    // get the directory
    String extSDCardDirName =
        this.getResources().getString(R.string.raster_folder);
    // get raster filename
    String filename = this.getString(R.string.shasta);
    // create the full path to the raster file
    return extStorDir.getAbsolutePath()
        + File.separator
        + extSDCardDirName
        + File.separator
        + filename
        + ".tif";
  }

  /**
   * Loads Shasta.tif as a Raster and adds it to a new RasterLayer. The RasterLayer is then added
   * to the map as an operational layer. Map viewpoint is then set based on the Raster's geometry.
   */
  private void loadRaster() {
    // create a raster from a local raster file
    Raster raster = new Raster(buildRasterPath());
    // create a raster layer
    final RasterLayer rasterLayer = new RasterLayer(raster);
    // create a Map with imagery basemap
    ArcGISMap map = new ArcGISMap(Basemap.createImagery());
    // add the map to a map view
    mMapView.setMap(map);
    // add the raster as an operational layer
    map.getOperationalLayers().add(rasterLayer);
    // set viewpoint on the raster
    rasterLayer.addDoneLoadingListener(new Runnable() {
      @Override
      public void run() {
        mMapView.setViewpointGeometryAsync(rasterLayer.getFullExtent(), 50);
      }
    });
  }

  /**
   * Handle the permissions request response.
   */
  public void onRequestPermissionsResult(int requestCode,
      @NonNull String[] permissions,
      @NonNull int[] grantResults) {
    if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
      loadRaster();
    } else {
      // report to user that permission was denied
      Toast.makeText(MainActivity.this,
          getResources().getString(R.string.raster_write_permission_denied),
          Toast.LENGTH_SHORT).show();
    }
  }

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

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

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


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