bd09ll 表示百度經緯度坐標，
gcj02 表示經過國測局加密的坐標，
wgs84 表示gps獲取的坐標。
其中最坑的是百度的坐標，百度坐標在原有的基礎上自己做了一層加密，也就是bd0911，而且理論上來講這個加密的過程是不可逆的，
百度地圖api置提供了其他的坐標類型轉換成百度坐標的方法，但是這個過程並不可逆，但是確實被我找到一種辦法進行轉換，直接上代碼
/**
*
* 將百度坐標轉換成GPS坐標工具類
* @author fuys
*
*/
public class GlobalTool {
public final static double a = 6378245.0;
public final static double ee = 0.00669342162296594323;
// 判斷坐標是否在中國
public static boolean outOfChina(BDLocation bdLocation) {
double lat = bdLocation.getLatitude();
double lon = bdLocation.getLongitude();
if (lon < 72.004 || lon > 137.8347)
return true;
if (lat < 0.8293 || lat > 55.8271)
return true;
if ((119.962 < lon && lon < 121.750) && (21.586 < lat && lat < 25.463))
return true;
return false;
}
public final static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
public static BDLocation BAIDU_to_WGS84(BDLocation bdLocation) {
if (outOfChina(bdLocation)) {
return bdLocation;
}
double x = bdLocation.getLongitude() - 0.0065;
double y = bdLocation.getLatitude() - 0.006;
double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
bdLocation.setLongitude(z * Math.cos(theta));
bdLocation.setLatitude(z * Math.sin(theta));
return GCJ02_to_WGS84(bdLocation);
}
public static BDLocation GCJ02_to_WGS84(BDLocation bdLocation) {
if (outOfChina(bdLocation)) {
return bdLocation;
}
BDLocation tmpLocation = new BDLocation();
tmpLocation.setLatitude(bdLocation.getLatitude());
tmpLocation.setLongitude(bdLocation.getLongitude());
BDLocation tmpLatLng = WGS84_to_GCJ02(tmpLocation);
double tmpLat = 2 * bdLocation.getLatitude() - tmpLatLng.getLatitude();
double tmpLng = 2 * bdLocation.getLongitude()
- tmpLatLng.getLongitude();
for (int i = 0; i < 0; ++i) {
tmpLocation.setLatitude(bdLocation.getLatitude());
tmpLocation.setLongitude(bdLocation.getLongitude());
tmpLatLng = WGS84_to_GCJ02(tmpLocation);
tmpLat = 2 * tmpLat - tmpLatLng.getLatitude();
tmpLng = 2 * tmpLng - tmpLatLng.getLongitude();
}
bdLocation.setLatitude(tmpLat);
bdLocation.setLongitude(tmpLng);
return bdLocation;
}
public static BDLocation WGS84_to_GCJ02(BDLocation bdLocation) {
if (outOfChina(bdLocation)) {
return bdLocation;
}
double dLat = transformLat(bdLocation.getLongitude() - 105.0,
bdLocation.getLatitude() - 35.0);
double dLon = transformLon(bdLocation.getLongitude() - 105.0,
bdLocation.getLatitude() - 35.0);
double radLat = bdLocation.getLatitude() / 180.0 * Math.PI;
double magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
double sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0)
/ ((a * (1 - ee)) / (magic * sqrtMagic) * Math.PI);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * Math.PI);
bdLocation.setLatitude(bdLocation.getLatitude() + dLat);
bdLocation.setLongitude(bdLocation.getLongitude() + dLon);
return bdLocation;
}
public static double transformLat(double x, double y) {
double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
+ 0.2 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * Math.PI) + 20.0 * Math.sin(2.0 * x
* Math.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(y * Math.PI) + 40.0 * Math.sin(y / 3.0
* Math.PI)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(y / 12.0 * Math.PI) + 320 * Math.sin(y
* Math.PI / 30.0)) * 2.0 / 3.0;
return ret;
}
public static double transformLon(double x, double y) {
double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
* Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * Math.PI) + 20.0 * Math.sin(2.0 * x
* Math.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(x * Math.PI) + 40.0 * Math.sin(x / 3.0
* Math.PI)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(x / 12.0 * Math.PI) + 300.0 * Math.sin(x
/ 30.0 * Math.PI)) * 2.0 / 3.0;
return ret;
}
雖然理解起來很難，但是好用。
下面再講把GPS坐標轉換成百度坐標
// //GPS轉百度
// 將GPS設備采集的原始GPS坐標轉換成百度坐標
CoordinateConverter converter = new CoordinateConverter();
converter.from(CoordType.GPS);
// sourceLatLng待轉換坐標
converter.coord(desLatLng1);
LatLng desLatLng = converter.convert();
double la = desLatLng.latitude;
double ln = desLatLng.longitude;
LatLng ll = new LatLng(la, ln);
這個是百度api里面有的方法