Stretch Renderer

Demonstrates how to use a StretchRenderer on a RasterLayer. A StretchRenderer can be used to stretch tightly grouped values across the available value spectrum, creating more contrast between objects. This is useful for identifying objects in dark images.

How to use the sample

Choose one of the stretch parameter types. The other options will adjust based on the chosen type.

How it works

To apply a StretchRenderer to a RasterLayer:

1. Create a Raster from a raster file.
2. Create a RasterLayer from the Raster.
3. Create a Basemap from the RasterLayer and set it to the map.
4. Create a StretchRenderer, specifying the stretch parameters and other properties.
5. Set the Renderer on the RasterLayer with rasterLayer.setRenderer(renderer).

Features

• ArcGISMap
• Basemap
• MapView
• Raster
• RasterLayer
• StretchParameters
• StretchRenderer

Provision your device

1. Download the raster-file.zip data from ArcGIS Online.
2. Extract the contents of the downloaded zip file to disk.
3. Create an ArcGIS/samples/raster folder on your device. You can use the Android Debug Bridge (adb) tool found in /platform-tools.
4. Open up a command prompt and execute the adb shell command to start a remote shell on your target device.
5. Navigate to your sdcard directory, e.g. cd /sdcard/.
6. Create the ArcGIS/samples directory, mkdir ArcGIS/samples/raster.
7. You should now have the following directory on your target device, /sdcard/ArcGIS/samples/raster. We will copy the contents of the downloaded data into this directory. Note: Directory may be slightly different on your device.
8. Exit the shell with the, exit command.
9. While still in your command prompt, navigate to the root folder where you extracted the contents of the data from step 1 and execute the following command:
   • adb push raster-file/. /sdcard/ArcGIS/samples/raster

Link	Local Location
raster-file.zip	<sdcard>/ArcGIS/samples/raster/Shasta.tif