/**	 * 坐标转换，腾讯地图转换成百度地图坐标	 * @param lat 腾讯纬度	 * @param lon 腾讯经度	 * @return 返回结果：经度,纬度	 */	public String map_tx2bd(double lat, double lon){		double bd_lat;		double bd_lon;		double x_pi=3.14159265358979324;	    double x = lon, y = lat;	    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);	    bd_lon = z * Math.cos(theta) + 0.0065;	    bd_lat = z * Math.sin(theta) + 0.006;	    	    System.out.println("bd_lat:"+bd_lat);	    System.out.println("bd_lon:"+bd_lon);	    return bd_lon+","+bd_lat;	}	 	/**	 * 坐标转换，百度地图坐标转换成腾讯地图坐标	 * @param lat  百度坐标纬度	 * @param lon  百度坐标经度	 * @return 返回结果：纬度,经度	 */	public String map_bd2tx(double lat, double lon){		double tx_lat;		double tx_lon;		double x_pi=3.14159265358979324;		double x = lon - 0.0065, y = lat - 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);	    tx_lon = z * Math.cos(theta);	    tx_lat = z * Math.sin(theta);	    return tx_lat+","+tx_lon;	}

http://blog.csdn.net/myfmyfmyfmyf/article/details/45717797

http://www.jb51.net/article/71671.htm