这个事情分两步走

1. 拿到行政区划的地理围栏数据

2. 根据GPS定位判断一个点是否落在地理围栏的多边形区域里。

1. 获取行政区划的地理围栏数据可以利用百度API。打开以前我的一个例子在chrome console里输入 
var bdary = new BMap.Boundary();

bdary.get("北京市延庆区", function(res){ //获取行政区域
//这里是用户自己的函数。
var count = res.boundaries.length;
console.debug("length of bounds ="+count)
console.debug(res.boundaries[0])
});

地理围栏信息会被打印在chrome的控制台里， 注意一下， 一般length of bounds是1， 但是也有例外， 比如北京首都国际机场虽然位于顺义区内和朝阳区不交接， 但却是属于朝阳区的行政区划， 这个时候 length of bound就是2

把打印在屏幕上的GPS数组拷贝下来。 接下来找一个判断点是否位于多边形内的算法实现。 组合一下， 功能就实现出来了。

_{package com.didi.data.dataDocking.service;}

_{import java.util.HashMap;}

_{import java.util.Map;}

_{public class BeiJinDistrictMap {}

_{static final Map<String, String> mapMap = new HashMap<String, String>();}

_{static final Map<String, double[][]> mapPoints = new HashMap<String, double[][]>();}

_{static {}

_{mapMap.put("110108_haidian_bj", "116.341137, 39.923964;116.339679, 39.94356;116.334715, 39.948162;116.357253, 39.948746;116.358141, 39.956251;116.362253, 39.957521;116.362998, 39.949865;116.378502, 39.954835;116.37692, 39.973552;116.389736, 39.974387;116.387287, 39.993956;116.362761, 40.026109;116.363069, 40.02954;116.357718, 40.032531;116.401464, 40.039194;116.396604, 40.04379;116.397325, 40.047524;116.378543, 40.050829;116.37375, 40.057042;116.379802, 40.060106;116.378836, 40.063911;116.389051, 40.066847;116.386902, 40.07159;116.379795, 40.071643;116.376853, 40.075298;116.369691, 40.074844;116.369768, 40.07191;116.353507, 40.069364;116.349949, 40.061113;116.346675, 40.060861;116.34552, 40.064731;116.335378, 40.06064;116.325006, 40.067249;116.313008, 40.068525;116.310228, 40.066449;116.296905, 40.089609;116.286401, 40.086145;116.280513, 40.097876;116.265798, 40.10745;116.271527, 40.110243;116.269771, 40.117429;116.264818, 40.118596;116.263369, 40.110845;116.246619, 40.114369;116.251428, 40.118582;116.254817, 40.141222;116.239751, 40.142021;116.223719, 40.147867;116.214447, 40.146781;116.209906, 40.167109;116.201798, 40.166439;116.197998, 40.161694;116.190154, 40.164269;116.188151, 40.153554;116.181289, 40.148843;116.176081, 40.148902;116.176031, 40.145915;116.171412, 40.146314;116.176745, 40.143174;116.179721, 40.13387;116.174848, 40.134699;116.177839, 40.130436;116.141183, 40.127954;116.137391, 40.121312;116.120823, 40.121343;116.113567, 40.124048;116.108368, 40.122302;116.10376, 40.127436;116.081711, 40.121954;116.077221, 40.111653;116.063592, 40.103311;116.056474, 40.092332;116.063413, 40.083336;116.071468, 40.079457;116.072308, 40.073843;116.078539, 40.068341;116.075555, 40.058363;116.0821, 40.043526;116.085314, 40.039136;116.092141, 40.037016;116.107208, 40.039888;116.144993, 40.035981;116.155357, 40.028917;116.164319, 40.027556;116.182703, 40.012638;116.179676, 40.007247;116.167804, 40.006381;116.157626, 39.999989;116.16467, 39.990209;116.174553, 39.993657;116.175724, 39.983666;116.185043, 39.988499;116.185431, 39.994544;116.191454, 39.992044;116.192751, 39.976711;116.208046, 39.967038;116.209915, 39.962145;116.225593, 39.94995;116.220405, 39.939699;116.222384, 39.933733;116.213491, 39.930676;116.213391, 39.923814;116.238498, 39.922;116.259497, 39.927929;116.259612, 39.9237;116.25575, 39.921998;116.259455, 39.921458;116.25952, 39.903235;116.301619, 39.90306;116.302701, 39.892937;116.305624, 39.895923;116.313912, 39.896884;116.310609, 39.898681;116.319901, 39.902635;116.341152, 39.902656;116.341137, 39.923964");}

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_{mapMap.put("110105_chaoyang2_bj", "116.585946, 40.108489;116.580796, 40.114407;116.588382, 40.070354;116.589296, 40.07539;116.594003, 40.075123;116.599209, 40.04918;116.608066, 40.04793;116.611527, 40.05258;116.606683, 40.056851;116.610901, 40.057342;116.613176, 40.052734;116.615113, 40.06689;116.610807, 40.099895;116.605559, 40.10916;116.606215, 40.099813;116.587888, 40.09704;116.585946, 40.108489");}

_{mapMap.put("110106_fengtai_bj","116.256504, 39.901832;116.247435, 39.900952;116.240275, 39.897855;116.240775, 39.895463;116.234411, 39.89479;116.234483, 39.889278;116.226217, 39.887366;116.224868, 39.882421;116.217259, 39.884172;116.218901, 39.880592;116.214799, 39.880066;116.206242, 39.889109;116.190577, 39.886765;116.173838, 39.895537;116.169036, 39.893538;116.161725, 39.895637;116.157161, 39.890453;116.146718, 39.890631;116.117558, 39.878682;116.11003, 39.879466;116.107895, 39.873363;116.102273, 39.874836;116.093556, 39.871985;116.084896, 39.876347;116.076807, 39.874628;116.073513, 39.872018;116.076684, 39.859606;116.071776, 39.860556;116.06999, 39.857209;116.066515, 39.85984;116.060452, 39.852314;116.064312, 39.848731;116.078763, 39.844895;116.089112, 39.833674;116.091293, 39.838849;116.090487, 39.832231;116.093187, 39.836506;116.095644, 39.835118;116.0946, 39.82529;116.090663, 39.825264;116.095381, 39.823038;116.091005, 39.818077;116.09173, 39.801737;116.097615, 39.788216;116.107431, 39.78888;116.108873, 39.792459;116.110369, 39.78959;116.110568, 39.792665;116.115718, 39.792642;116.115005, 39.795307;116.121125, 39.795265;116.122399, 39.797641;116.126981, 39.796911;116.127687, 39.791932;116.138923, 39.790363;116.137427, 39.788825;116.141971, 39.78709;116.131317, 39.783576;116.129824, 39.786123;116.123971, 39.780286;116.127152, 39.779628;116.127281, 39.776305;116.124423, 39.777118;116.12792, 39.768454;116.128509, 39.772494;116.131038, 39.768706;116.144619, 39.774184;116.145812, 39.770833;116.153328, 39.77254;116.152942, 39.776116;116.166792, 39.77348;116.172405, 39.780018;116.175093, 39.791002;116.190438, 39.790366;116.190902, 39.786516;116.194623, 39.788074;116.206846, 39.783949;116.208419, 39.805525;116.215719, 39.812206;116.214865, 39.817114;116.222484, 39.822667;116.220145, 39.829412;116.234878, 39.831177;116.247313, 39.821725;116.25883, 39.799165;116.265202, 39.803607;116.268574, 39.799022;116.29357, 39.805137;116.29561, 39.8028;116.300383, 39.80406;116.30255, 39.801777;116.297442, 39.799567;116.299128, 39.79707;116.304814, 39.797705;116.313532, 39.776071;116.316446, 39.775618;116.324301, 39.789189;116.328358, 39.789516;116.329653, 39.803931;116.333171, 39.803811;116.334793, 39.80701;116.346976, 39.807642;116.350569, 39.81346;116.36231, 39.811396;116.363526, 39.806492;116.373788, 39.805579;116.373981, 39.790829;116.385112, 39.791699;116.385589, 39.784822;116.397113, 39.787789;116.398612, 39.771406;116.404908, 39.772039;116.402776, 39.793023;116.426144, 39.793452;116.428264, 39.798983;116.435831, 39.800279;116.435096, 39.80971;116.430595, 39.80969;116.42899, 39.815918;116.424621, 39.81538;116.421719, 39.818672;116.416209, 39.817351;116.416286, 39.8225;116.425879, 39.821073;116.424287, 39.828389;116.420636, 39.830117;116.422414, 39.835591;116.426128, 39.832878;116.431615, 39.838691;116.437902, 39.83852;116.442984, 39.847021;116.447524, 39.845285;116.453684, 39.847044;116.453186, 39.854005;116.46466, 39.856262;116.467119, 39.854165;116.471752, 39.856764;116.472532, 39.861387;116.45754, 39.868812;116.451866, 39.868396;116.450089, 39.878013;116.419873, 39.878168;116.423156, 39.873252;116.420505, 39.865369;116.402273, 39.865175;116.397662, 39.871581;116.387944, 39.87347;116.3877, 39.877337;116.358673, 39.87466;116.356864, 39.879846;116.350725, 39.879437;116.349776, 39.881578;116.327912, 39.880918;116.332493, 39.902619;116.319901, 39.902635;116.310609, 39.898681;116.313912, 39.896884;116.305624, 39.895923;116.302701, 39.892937;116.301619, 39.90306;116.256504, 39.901832");}

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40.54366;117.259649, 40.547985;117.256124, 40.554638;117.272602, 40.564079;117.302711, 40.572713;117.317146, 40.582207;117.340905, 40.582418;117.356706, 40.586185;117.372601, 40.582034;117.382658, 40.572888;117.395929, 40.567374;117.410574, 40.579774;117.426571, 40.574504;117.436606, 40.584657;117.42995, 40.58783;117.420328, 40.612091;117.429118, 40.643382;117.478347, 40.653361;117.485398, 40.64184;117.507621, 40.642461;117.509516, 40.659031;117.513171, 40.660949;117.512283, 40.673448");}

_{for ( String key : mapMap.keySet())}

_{

_{String points = mapMap.get(key);}

_{String []poss = points.split(";");}

_{double [][]results = new double [poss.length][2];}

_{int i=0;}

_{for (String pos :poss)}

_{

_{String []temp = pos.split("\\,");}

_{results[i][0] =Double.valueOf(temp[0]);}

_{results[i][1] =Double.valueOf(temp[1]);}

_i++;

_}

_{mapPoints.put(key, results);}

_}

_}

_{public static boolean IsPtInPoly(double ALon, double ALat ,double [][]APoints)}

_{

_{boolean bRet=false;}

_{int iSum = 0;}

_{double dLon1, dLon2, dLat1, dLat2, dLon;}

_{int iCount = APoints.length;}

_{for (int i = 0; i < iCount; i++) {}

_{if (i == iCount - 1) {}

_{dLon1 = APoints[i][0];}

_{dLat1 = APoints[i][1];}

_{dLon2 = APoints[0][0];} 

_{dLat2 = APoints[0][1];} 

_{} else {} 

_{dLon1 = APoints[i][0];}

_{dLat1 = APoints[i][1];}

_{dLon2 = APoints[i + 1][0];}

_{dLat2 = APoints[i + 1][1];}

_}

_{if (((ALat >= dLat1) && (ALat < dLat2)) || ((ALat >= dLat2) && (ALat < dLat1))) {}  

_{if (Math.abs(dLat1 - dLat2) > 0) {}  

_{dLon = dLon1 - ((dLon1 - dLon2) * (dLat1 - ALat)) / (dLat1 - dLat2);}

_{if (dLon < ALon) iSum++;}

_}

_}

_}

_{if (iSum % 2 != 0)}

_bRet=true;

_{return bRet;}

_}

_{public static String getDistrict(double ln, double la)}

_{

_{String sRet="";}

_{for ( String key : mapPoints.keySet())}

_{

_{if (IsPtInPoly(ln, la, mapPoints.get(key)))}

_{

_{sRet=key.substring(0, key.indexOf("_"));}

_break;

_}

_}

_{return sRet;}

_}

_{public static void main(String args[])}

_{

_{System.out.println("从百度地图中随机选取坐标， 测试");}

_{System.out.println("顺义， " +getDistrict(116.649269,40.154532));}

_{System.out.println("海淀， " +getDistrict( 116.309207,39.973302));}

_{System.out.println("石景山， "+getDistrict(116.181576,39.919314));}

_{System.out.println("西城， "+getDistrict(116.387395,39.9202));}

_{System.out.println("通州， "+getDistrict(116.689801,39.804115));}

_{System.out.println("丰台， "+getDistrict(116.280461,39.864397));}

_{System.out.println("密云， "+getDistrict(116.935002,40.387062));}

_{System.out.println("大兴,  "+getDistrict(116.360949,39.756206));}

_{System.out.println("从北京数据对接日志中随机选取坐标， 测试");}

_{System.out.println("海淀区.西三旗,  "+getDistrict(116.33561,40.04739));}

_{System.out.println("丰台区万泉寺北路10号院,  "+getDistrict(116.34218,39.86652));}

_{System.out.println("车公庄-H口,  "+getDistrict(116.353271,39.931912));}

_}

_}

根据GPS经纬度判断当前所属的市区