Snippet for parsing KML file and then converting to polygon shapes of Android Google Maps V2

kml-to-android-maps-v2.php

<?php
/**
 * Dirty way to parse the KML file and create equivalent polygons for android maps V2
 * 
 * What it does:
 *  - Reads local KML file and looks for "Polygon" data, and converts them
 *    to equivalent simple polygon data for Android Maps V2
 * 
 * What it does NOT do / Limitations:
 *  - Consider all possible DOM tree structure 
 *    (manually need to update selector for placemark,
 *    eg. "$kml->Document->Placemark as $pm")
 *  - use altitude values 
 *  - Create complex Polygon with hole
 *  - Style polygon based on KML style document
 *  - and many more
 * 
 * Why create this?
 *  - I needed quick way to generate tons of polygon data from KML.
 *    Since, android maps v2 does not support KML data, needed something like this script  
 * 
 * References:
 *  - KML Reference: https://developers.google.com/kml/documentation/kmlreference
 *  - POLYGON on KML: https://developers.google.com/kml/documentation/kmlreference#polygon
 */

// enable error reporting - helpful when working on this script
error_reporting(E_ALL);
ini_set('display_errors', 1);
echo 'Begin Script <br/><hr/>';


$polygonDataArray = array();

$kml = simplexml_load_file('data.kml');
//print_r($kml->Document); // debug the whole document data

/* You MUST update this selector to math your KML document tree */
foreach($kml->Document->Placemark as $pm){
  if(isset($pm->Polygon)){
		// Process polygon datas

		// Get coordinates for 'outerBoundaryIs', other possible data not considered is 'innerBoundaryIs'
		$coordinates = $pm->Polygon->outerBoundaryIs->LinearRing->coordinates;
		$cordsData = trim(((string) $coordinates));

                // check if coordinate data is available
                if(isset($cordsData) && !empty($cordsData)){
                    
                    $explodedData = explode("\n", $cordsData);
                    $explodedData = array_map('trim', $explodedData);
                    
                    // next for each of the points build the polygon data
                    $points = "";
                    foreach ($explodedData as $index => $coordinateString) {
                        $coordinateSet = array_map('trim', explode(',', $coordinateString));
                        if(count($coordinateSet) == 3){
                            // lon,lat[,alt] | Index 0 = lon, index 1 = lat, index 2 = alt [optional] 
                            $points .= " new LatLng({$coordinateSet[1]}, {$coordinateSet[0]}),";
                        } else {
                            echo '<br/>Unhandled case for data set : ' . print_r($coordinateSet, true);
                        }
                    }
                    // at the end, remove the last ','
                    $polygonDataArray[] = "new PolygonOptions().add(" . substr($points, 0, -1) . ")";
                    
                    
                }
                
	} else {
		echo '<br/>Not a polygon - skipping';
	}
}

$androidMapJava = "
private static List<PolygonOptions> polygonOptionsList = new ArrayList<PolygonOptions>();
static {
";
foreach ($polygonDataArray as $polyDataSet) {
    // add polygon to list - add a
    $androidMapJava.= "\tpolygonOptionsList.add({$polyDataSet}.strokeColor(Color.BLACK));\n";
}
$androidMapJava .= "}";
        
echo "
<pre>
{$androidMapJava}
</pre>
";


?>