com.esri.arcgisruntime.sample.colormaprenderer.MainActivity.java Source code

Introduction

Here is the source code for com.esri.arcgisruntime.sample.colormaprenderer.MainActivity.java

Source

/* 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.colormaprenderer;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Color;
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.util.Log;
import android.widget.Toast;

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

/**
 * A sample class which demonstrates the ColorMapRenderer.
 */
public class MainActivity extends AppCompatActivity {

    private final static String TAG = MainActivity.class.getSimpleName();

    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 ShastaBW.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_b_w);
        // create the full path to the raster file
        return extStorDir.getAbsolutePath() + File.separator + extSDCardDirName + File.separator + filename
                + ".tif";
    }

    /**
     * Loads ShastaBW.tif as a Raster and adds it to a new RasterLayer. RasterLayer is then added to the map as an
     * operational layer. A List of color values is created (0-149: red) (150-250: yellow). The List is passed to a new
     * ColorMapRenderer, which is then set to the RasterLayer Rendererer. Map viewpoint is then set based on Raster
     * 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);
        // create a color map where values 0-149 are red (Color.RED) and 150-250 are yellow (Color.Yellow)
        List<Integer> colors = new ArrayList<>();
        for (int i = 0; i <= 250; i++) {
            if (i < 150) {
                colors.add(i, Color.RED);
            } else {
                colors.add(i, Color.YELLOW);
            }
        }
        // create a colormap renderer
        ColormapRenderer colormapRenderer = new ColormapRenderer(colors);
        // set the ColormapRenderer on the RasterLayer
        rasterLayer.setRasterRenderer(colormapRenderer);
        // set Viewpoint on the Raster
        rasterLayer.addDoneLoadingListener(new Runnable() {
            @Override
            public void run() {
                if (rasterLayer.getLoadStatus() == LoadStatus.LOADED) {
                    mMapView.setViewpointGeometryAsync(rasterLayer.getFullExtent(), 50);
                } else {
                    String error = "RasterLayer failed to load: " + rasterLayer.getLoadError().getMessage();
                    Log.e(TAG, error);
                    Toast.makeText(MainActivity.this, error, Toast.LENGTH_LONG).show();
                }
            }
        });
    }

    /**
     * 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.colormap_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();
    }
}