import org.osgeo.proj4j.CRSFactory; //导入依赖的package包/类
private static Pair<Double, Double> fromHK80toWGS84(Pair<Double, Double> pair) {
    try {
        // reference: blog.tiger-workshop.com/hk1980-grid-to-wgs84/
        CoordinateTransformFactory ctFactory = new CoordinateTransformFactory();
        CRSFactory csFactory = new CRSFactory();
        CoordinateReferenceSystem HK80 = csFactory.createFromParameters("EPSG:2326", "+proj=tmerc +lat_0=22.31213333333334 +lon_0=114.1785555555556 +k=1 +x_0=836694.05 +y_0=819069.8 +ellps=intl +towgs84=-162.619,-276.959,-161.764,0.067753,-2.24365,-1.15883,-1.09425 +units=m +no_defs");
        CoordinateReferenceSystem WGS84 = csFactory.createFromParameters("WGS84", "+proj=longlat +datum=WGS84 +no_defs");
        CoordinateTransform trans = ctFactory.createTransform(HK80, WGS84);
        ProjCoordinate p = new ProjCoordinate();
        ProjCoordinate p2 = new ProjCoordinate();
        p.x = pair.first;
        p.y = pair.second;
        trans.transform(p, p2);
        return new Pair<>(p2.x, p2.y);
    } catch (IllegalStateException e) {
        Timber.e(e);
    }
    return null;
}
 

import org.osgeo.proj4j.CRSFactory; //导入依赖的package包/类
/**
 * Convert geometry to different coordinate system given the source/target
 * proj4 parameters. Presumably these were pulled from SPATIAL_REF_SYS.
 *
 * @param geom
 * @param srcParams
 * @param tgtParams
 * @return
 * @throws FunctionExecutionException
 */
public static Geometry transform(Geometry geom, 
                                 String srcParams, 
                                 String tgtParams) 
        throws FunctionExecutionException {
    
    CoordinateTransformFactory ctFactory = new CoordinateTransformFactory();
    CRSFactory crsFactory = new CRSFactory();
    
    CoordinateReferenceSystem srcCrs = crsFactory.createFromParameters(null, srcParams);
    CoordinateReferenceSystem tgtCrs = crsFactory.createFromParameters(null, tgtParams);
    
    CoordinateTransform coordTransform = ctFactory.createTransform(srcCrs, tgtCrs);

    return transformGeometry(coordTransform, geom);
}
 

import org.osgeo.proj4j.CRSFactory; //导入依赖的package包/类
public static ProjCoordinate latlon2twd67(LatLng latLng) {

        CoordinateTransformFactory ctFactory = new CoordinateTransformFactory();
        CRSFactory csFactory = new CRSFactory();
        CoordinateReferenceSystem crs1 = csFactory.createFromParameters(EPSG_WGS84, FUNC_WGS84);
        CoordinateReferenceSystem crs2 = csFactory.createFromParameters(EPSG_TWD67, FUNC_TWD67);
        CoordinateTransform trans = ctFactory.createTransform(crs1, crs2);
        ProjCoordinate p1 = new ProjCoordinate();
        ProjCoordinate p2 = new ProjCoordinate();
        p1.x = latLng.longitude;
        p1.y = latLng.latitude;
        trans.transform(p1, p2);

        return p2;
    }
 

import org.osgeo.proj4j.CRSFactory; //导入依赖的package包/类
public void setup() {
  int sridSrc = sridSrcParam.value;
  sridTgt = sridTgtParam.value;

  org.osgeo.proj4j.CoordinateReferenceSystem srcCrs =
      new org.osgeo.proj4j.CRSFactory().createFromName("EPSG:" + sridSrc);

  org.osgeo.proj4j.CoordinateReferenceSystem tgtCrs =
      new org.osgeo.proj4j.CRSFactory().createFromName("EPSG:" + sridTgt);

  transform = new org.osgeo.proj4j.BasicCoordinateTransform(srcCrs, tgtCrs);
}