AndroidGeoJson
GeoJSONを扱うAndroid用のライブラリです
Using in your projects
Gradle
implementation 'com.kiyosuke:androidgeojson:0.1.1'
How to use
JSONObjectからGeoJSONの取得
val json = JSONObject(/* GeoJSONの文字列 */)
val line = json.getGeoLineString("lineString")
val point = json.getGeoPoint("point")
val polygon = json.getGeoPolygon("polygon")
GeoJSONをJSONObjectに変換
val geoJson = GeoJson.parse(
"""
{
"type": "LineString",
"coordinates": [ [100.0, 0.0], [101.0, 1.0] ]
}
"""
)
val json = geoJson.toJson()
GeoJSON生成
GeoJSONの生成は、各GeoJSONのコンストラクタに値を渡して生成します。
val line = GeoLineString(listOf(GeoPosition(10.0, 100.0), GeoPosition(11.0, 110.0), GeoPosition(12.0, 120.0)))
val point = GeoPoint(GeoPosition(10.0, 100.0))
DSLを使うことで生成することもできます。
val line = geoLine {
+point(100.0, 10.0)
+point(110.0, 11.0)
+point(120.0, 12.0)
}
val multiLine = geoMultiLine {
+geoLine {
+point(100.0, 10.0)
+point(110.0, 11.0)
+point(120.0, 12.0)
}
+geoLine {
+point(100.0, 10.0)
+point(110.0, 11.0)
+point(120.0, 12.0)
}
}
val point = geoPoint(100.0, 10.0)
val multiPoint = geoMultiPoint {
+geoPoint(100.0, 10.0)
+geoPoint(110.0, 11.0)
}
val geoPolygon = geoPolygon {
outline {
+point(100.0, 10.0)
+point(110.0, 11.0)
+point(120.0, 12.0)
+point(130.0, 13.0)
}
innerline {
+point(100.0, 10.0)
+point(110.0, 11.0)
+point(120.0, 12.0)
+point(130.0, 13.0)
}
}
val geoMultiPolygon = geoMultiPolygon {
+geoPolygon {
outline {
+point(100.0, 10.0)
+point(110.0, 11.0)
+point(120.0, 12.0)
+point(130.0, 13.0)
}
}
+geoPolygon {
outline {
+point(100.0, 10.0)
+point(110.0, 11.0)
+point(120.0, 12.0)
+point(130.0, 13.0)
}
}
}
val feature = geoFeature {
+geoLine {
+point(100.0, 10.0)
+point(110.0, 20.0)
+point(120.0, 30.0)
}
+prop("key", "value")
}
val featureCollection = geoFeatureCollection {
+geoFeature {
+geoLine {
+point(100.0, 10.0)
+point(110.0, 20.0)
+point(120.0, 30.0)
}
+prop("key", "value")
}
+geoFeature {
+geoLine {
+point(120.0, 20.0)
+point(130.0, 30.0)
+point(140.0, 40.0)
}
+prop("id", 1)
}
}
val geometryCollection = geometryCollection {
+geoLine {
+point(100.0, 10.0)
+point(100.0, 10.0)
+point(100.0, 10.0)
}
+geoPolygon {
outline {
+point(100.0, 10.0)
+point(100.0, 10.0)
+point(100.0, 10.0)
}
}
+geoLine {
+point(100.0, 10.0)
+point(100.0, 10.0)
+point(100.0, 10.0)
}
}
参考
GeoJSON フォーマット仕様 https://s.kitazaki.name/docs/geojson-spec-ja.html#id12