在 Arcgis for android 中，并没有直接将 wkt 字符转化为 geometry 的接口，所以我们需要先将 wkt 字符先转化为arcgis可用的 json 字符串，再将 json 字符串转化为我们需要的 Geometry图形。
1、Wkt → Json
1、图形种类：图形分为POINT、MULTIPOINT、LINESTRING、MULTILINESTRING、POLYGON、MULTIPOLYGON这几种类型。
POINT ---- 点
MULTIPOINT ---- 多个点
LINESTRING ---- 线
MULTILINESTRING ---- 多条线
POLYGON ---- 多边形
MULTIPOLYGON ---- 多个多边形
对应的ArcGis对于不同类型所需的JSON格式也不相同。
2、分别构建各种类型的实体类（根据实际需求）
PointObject类（对应POINT）：
public class PointObject {
private double x;
private double y;
private HashMap<String, Integer> spatialReference;
public double getX() {
return x;
}
public void setX(double x) {
this.x = x;
}
public double getY() {
return y;
}
public void setY(double y) {
this.y = y;
}
public HashMap<String, Integer> getSpatialReference() {
return spatialReference;
}
public void setSpatialReference(HashMap<String, Integer> spatialReference) {
this.spatialReference = spatialReference;
}
}
MultiIPointObject类（对应MultiIPoint）：
public class MultiIPointObject {
private List<Double[]> points;
private HashMap<String, Integer> spatialReference;
public List<Double[]> getPoints() {
return points;
}
public void setPoints(List<Double[]> points) {
this.points = points;
}
public HashMap<String, Integer> getSpatialReference() {
return spatialReference;
}
public void setSpatialReference(HashMap<String, Integer> spatialReference) {
this.spatialReference = spatialReference;
}
}
LineStringObject类（对应 LineString）：
public class LineStringObject {
private List<List<Double[]>> paths;
private HashMap<String, Integer> spatialReference;
public List<List<Double[]>> getPaths() {
return paths;
}
public void setPaths(List<List<Double[]>> paths) {
this.paths = paths;
}
public HashMap<String, Integer> getSpatialReference() {
return spatialReference;
}
public void setSpatialReference(HashMap<String, Integer> spatialReference) {
this.spatialReference = spatialReference;
}
}
MultLinesStringObject类（对应 MultLinesString）：
public class MultLinesStringObject {
private List<List<Double[]>> rings;
private HashMap<String, Integer> spatialReference;
public List<List<Double[]>> getRings() {
return rings;
}
public void setRings(List<List<Double[]>> rings) {
this.rings = rings;
}
public HashMap<String, Integer> getSpatialReference() {
return spatialReference;
}
public void setSpatialReference(HashMap<String, Integer> spatialReference) {
this.spatialReference = spatialReference;
}
}
PolygonObject类（对应 Polygon 和 MULTIPOLYGON）：
public class PolygonObject {
private List<List<Double[]>> rings;
private HashMap<String, Integer> spatialReference;
public List<List<Double[]>> getRings() {
return rings;
}
public void setRings(List<List<Double[]>> rings) {
this.rings = rings;
}
public HashMap<String, Integer> getSpatialReference() {
return spatialReference;
}
public void setSpatialReference(HashMap<String, Integer> spatialReference) {
this.spatialReference = spatialReference;
}
}
3、开始转换（通过 Google 提供的 Gson.jar 进行 JSON转换）
public class WKT {
/**
* 点 转换 JSON
* @param wkt
* @param wkid
* @return
*/
public String getPOINTWktToJson(String wkt, int wkid) {
String[] strHead = wkt.split("\\(");
String strContent = strHead[1].substring(0, strHead[1].length() - 1);
String[] strResult = strContent.split(" ");
PointObject pointObject = new PointObject();
pointObject.setX(Double.parseDouble(strResult[0]));
pointObject.setY(Double.parseDouble(strResult[1]));
HashMap<String, Integer> spatialReference = new HashMap<String, Integer>();
spatialReference.put("wkid", wkid);
pointObject.setSpatialReference(spatialReference);
Gson gson = new Gson();
return gson.toJson(pointObject);
}
/**
* 多点 转换 JSON
* @param wkt
* @param wkid
* @return
*/
public String getMULTIPOINTWktToJson(String wkt, int wkid) {
MultiIPointObject multiIPointObject = new MultiIPointObject();
String ToTailWkt = wkt.substring(0, wkt.length() - 1);
String[] strHead = ToTailWkt.split("\\(\\(");
String strMiddle = strHead[1].substring(0, strHead[1].length() - 1);
String[] strMiddles = strMiddle.split(",");
List<Double[]> list = new ArrayList<Double[]>();
for (int i = 0; i < strMiddles.length; i++) {
if (i == 0) {
String item = strMiddles[i].substring(0,
strMiddles[i].length() - 1);
String[] items = item.split(" ");
Double[] listResult = new Double[] {
Double.parseDouble(items[0]),
Double.parseDouble(items[1]) };
list.add(listResult);
} else if (i == strMiddles.length) {
String item = strMiddles[i]
.substring(1, strMiddles[i].length());
String[] items = item.split(" ");
Double[] listResult = new Double[] {
Double.parseDouble(items[0]),
Double.parseDouble(items[1]) };
list.add(listResult);
} else {
String strItem = strMiddles[i].trim();
String item = strItem.substring(1, strItem.length() - 1);
String[] items = item.split(" ");
Double[] listResult = new Double[] {
Double.parseDouble(items[0]),
Double.parseDouble(items[1]) };
list.add(listResult);
}
}
HashMap<String, Integer> spatialReference = new HashMap<String, Integer>();
spatialReference.put("wkid", wkid);
multiIPointObject.setPoints(list);
multiIPointObject.setSpatialReference(spatialReference);
Gson gson = new Gson();
return gson.toJson(multiIPointObject);
}
/**
* 线 转换 JSON
* @param wkt
* @param wkid
* @return
*/
public String getLINESTRINGWktToJson(String wkt, int wkid) {
LineStringObject lineStringObject = new LineStringObject();
List<List<Double[]>> lists = new ArrayList<List<Double[]>>();
List<Double[]> list = new ArrayList<Double[]>();
String[] strHead = wkt.split("\\(");
String strContent = strHead[1].substring(0, strHead[1].length() - 1);
String[] strResult = strContent.split(",");
for (int i = 0; i < strResult.length; i++) {
String itme = strResult[i].trim();
String[] items = itme.split(" ");
Double[] listResult = new Double[] { Double.parseDouble(items[0]),
Double.parseDouble(items[1]) };
list.add(listResult);
}
lists.add(list);
HashMap<String, Integer> spatialReference = new HashMap<String, Integer>();
spatialReference.put("wkid", wkid);
lineStringObject.setPaths(lists);
lineStringObject.setSpatialReference(spatialReference);
Gson gson = new Gson();
return gson.toJson(lineStringObject);
}
/**
* 多线 转换 JSON
* @param wkt
* @param wkid
* @return
*/
public String getMULTILINESTRINGWktToJson(String wkt, int wkid) {
MultLinesStringObject lineStringObject = new MultLinesStringObject();
List<List<Double[]>> lists = new ArrayList<List<Double[]>>();
String ToTailWkt = wkt.substring(0, wkt.length() - 1);
String[] strHead = ToTailWkt.split("\\(", 2);
String[] strList = strHead[1].split("\\),\\(");
for (int i = 0; i < strList.length; i++) {
String item = strList[i].trim();
item = item.substring(1, item.length() - 1);
String[] items = item.split(",");
List<Double[]> list = new ArrayList<Double[]>();
for (int j = 0; j < items.length; j++) {
String jItem = items[j].trim();
String[] jItems = jItem.split(" ");
Double[] listResult = new Double[] {
Double.parseDouble(jItems[0]),
Double.parseDouble(jItems[1]) };
list.add(listResult);
}
lists.add(list);
}
HashMap<String, Integer> spatialReference = new HashMap<String, Integer>();
spatialReference.put("wkid", wkid);
lineStringObject.setRings(lists);
lineStringObject.setSpatialReference(spatialReference);
Gson gson = new Gson();
return gson.toJson(lineStringObject);
}
/**
* 多边形 转换 JSON
* @param wkt
* @param wkid
* @return
*/
public String getPOLYGONWktToJson(String wkt, int wkid) {
PolygonObject polygonObject = new PolygonObject();
List<List<Double[]>> lists = new ArrayList<List<Double[]>>();
String ToTailWkt = wkt.substring(0, wkt.length() - 1);
String[] strHead = ToTailWkt.split("\\(", 2);
String[] strList = strHead[1].split("\\), \\(");
for (int i = 0; i < strList.length; i++) {
String item = strList[i].trim();
item = item.substring(1, item.length() - 1);
String[] items = item.split(",");
List<Double[]> list = new ArrayList<Double[]>();
for (int j = 0; j < items.length; j++) {
String jItem = items[j].trim();
String[] jItems = jItem.split(" ");
Double[] listResult = new Double[] {
Double.parseDouble(jItems[0]),
Double.parseDouble(jItems[1]) };
list.add(listResult);
}
lists.add(list);
}
HashMap<String, Integer> spatialReference = new HashMap<String, Integer>();
spatialReference.put("wkid", wkid);
polygonObject.setRings(lists);
polygonObject.setSpatialReference(spatialReference);
Gson gson = new Gson();
return gson.toJson(polygonObject);
}
/**
* 多个多边形 转换 JSON
* @param wkt
* @param wkid
* @return
*/
public String getMULTIPOLYGONWktToJson(String wkt, int wkid) {
PolygonObject polygonObject = new PolygonObject();
List<List<Double[]>> lists = new ArrayList<List<Double[]>>();
String ToTailWkt = wkt.substring(0, wkt.length() - 1);
String[] strHead = ToTailWkt.split("\\(", 2);
ToTailWkt = strHead[1].substring(0, strHead[1].length() - 1);
String[] strHeads = ToTailWkt.split("\\(", 2);
String[] strList = strHeads[1].split("\\), \\(");
if (strList.length == 1) {
for (int i = 0; i < strList.length; i++) {
String item = strList[i].trim();
item = item.substring(1, item.length() - 1);
String[] items = item.split(",");
List<Double[]> list = new ArrayList<Double[]>();
for (int j = 0; j < items.length; j++) {
String jItem = items[j].trim();
String[] jItems = jItem.split(" ");
Double[] listResult = new Double[] {
Double.parseDouble(jItems[0]),
Double.parseDouble(jItems[1]) };
list.add(listResult);
}
lists.add(list);
}
} else {
for (int i = 0; i < strList.length; i++) {
String item = strList[i].trim();
item = item.substring(1, item.length() - 1);
String[] items = item.split(",");
List<Double[]> list = new ArrayList<Double[]>();
for (int j = 1; j < items.length; j++) {
String jItem = items[j].trim();
String[] jItems = jItem.split(" ");
Double[] listResult = new Double[] {
Double.parseDouble(jItems[0]),
Double.parseDouble(jItems[1]) };
list.add(listResult);
}
lists.add(list);
}
}
HashMap<String, Integer> spatialReference = new HashMap<String, Integer>();
spatialReference.put("wkid", wkid);
polygonObject.setRings(lists);
polygonObject.setSpatialReference(spatialReference);
Gson gson = new Gson();
return gson.toJson(polygonObject);
}
}
4、在代码中使用，将获取到的 Json 转换为我们需要的图形。
String geoJson = WKT.getLINESTRINGWktToJson(prjShapeStr, wkid);
JsonFactory jsonFactory = new JsonFactory();
JsonParser jsonParser = jsonFactory.createJsonParser(geoJson);
MapGeometry mapGeometry = GeometryEngine.jsonToGeometry(jsonParser);
Geometry geometry = mapGeometry.getGeometry();
5、转换完毕，获取到的 geometry 可以直接添加到 arcgis 动态图层中显示了。
参考文章：http://blog.csdn.net/u014014578/article/details/21453727
