Android 如何从JSON文件中获取lng和lat
我想从JSON文件中获取“lat”和“lng”,并将其添加到保留GeoPoint的数组中。我试图这样做,但对我来说不起作用:Android 如何从JSON文件中获取lng和lat,android,json,google-maps,Android,Json,Google Maps,我想从JSON文件中获取“lat”和“lng”,并将其添加到保留GeoPoint的数组中。我试图这样做,但对我来说不起作用: protected List<GeoPoint> JsonArray(){ List<GeoPoint> endp = new ArrayList<GeoPoint>(); try{ JSONObject obj = new JSONObject(json); JSONA
protected List<GeoPoint> JsonArray(){
List<GeoPoint> endp = new ArrayList<GeoPoint>();
try{
JSONObject obj = new JSONObject(json);
JSONArray steps = obj.getJSONArray("routes");
for(int i=0;i<steps.length();i++){
JSONObject temp = steps.getJSONObject(i);
JSONObject ele = temp.optJSONObject("steps").optJSONObject("end_location");
ele.getJSONObject("lat");
ele.getJSONObject("lng");
double lat = Double.parseDouble(ele.getJSONObject("lat").toString());
double lng = Double.parseDouble(ele.getJSONObject("lng").toString());
endp.add(new GeoPoint((int)(lat *1E6),(int)(lng * 1E6)));
}
}catch (JSONException e) {
// TODO: handle exception
}
return endp;
}
有人知道我如何以其他方式完成吗?您的变量
JSONArray steps=obj.getJSONArray(“routes”)
不表示JSON对象的“步骤”部分,而是“路由”部分
此外,您还跳过了JSON层次结构中的一些级别。对于给定的JSON,您将需要以下步骤来遍历JSON(除了routes数组之外,我省略了在不同数组上的循环)
JSONArray routes=obj.getJSONArray(“routes”);
对于(int i=0;i
引用:您的变量
JSONArray steps=obj.getJSONArray(“routes”);
不表示JSON对象的“steps”部分,而是“routes”部分
此外,您还跳过了JSON层次结构中的一些级别
JSONArray routes=obj.getJSONArray(“routes”);
对于(int i=0;i
参考:解析当前json字符串以获取lat和lng:
JSONObject obj = new JSONObject(json);
JSONArray steps = obj.getJSONArray("routes");
for(int i=0;i<steps.length();i++){
JSONObject temp = steps.getJSONObject(i);
// get bounds JSONObject
JSONObject boundsjsonobj = temp.getJSONObject("bounds");
// get northeast JSONObject
JSONObject jsonboj_bounds_northeast= boundsjsonobj.getJSONObject("northeast");
// get northeast lng and lat
String str_northeast_lat=jsonboj_bounds_northeast.getString("lat");
String str_northeast_lng=jsonboj_bounds_northeast.getString("lng");
// get southwest JSONObject
JSONObject jsonboj_bounds_southwest= boundsjsonobj.getJSONObject("southwest");
// get northeast lng and lat
String str_southwest_lat=jsonboj_bounds_southwest.getString("lat");
String str_southwest_lng=jsonboj_bounds_southwest.getString("lng");
//get legs JsonArray from routes
JSONArray jsonarray_legs = temp.getJSONArray("legs");
for(int j=0;j<jsonarray_legs.length();j++){
JSONObject jobjlegs = jsonarray_legs.getJSONObject(j);
// get end_location json object
JSONObject jobjlegs_end_location = jobjlegs.getJSONObject("end_location");
String str_end_location_lat==jobjlegs_end_location.getString("lat");
String str_end_location_lng==jobjlegs_end_location.getString("lng");
// get start_address object
JSONObject jobjlegs_start_address = jobjlegs.getJSONObject("start_address");
String str_start_address_lat==jobjlegs_start_address.getString("lat");
String str_start_address_lng==jobjlegs_start_address.getString("lng");
// get steps jsonArray
JSONArray jsonarray_steps = jobjlegs.getJSONArray("steps");
for(int k=0;k<jsonarray_steps.length();k++){
JSONObject jobjsteps = jsonarray_steps.getJSONObject(k);
// get end_location jsonobject
JSONObject jobjsteps_end_location = jobjsteps.getJSONObject("end_location");
double latend = Double.parseDouble(jobjsteps_end_location.getString("lat"));
double lngend = Double.parseDouble(jobjsteps_end_location.getString("lng"));
endp.add(new GeoPoint((int)(latend *1E6),(int)(lngend * 1E6)));
// get start_location jsonobject
JSONObject jobjsteps_start_location = jobjsteps.getJSONObject("start_location");
double latstart = Double.parseDouble(jobjsteps_start_location.getString("lat"));
double lngstart = Double.parseDouble(jobjsteps_start_location.getString("lng"));
}
}
}
JSONObject obj=新的JSONObject(json);
JSONArray steps=obj.getJSONArray(“路由”);
对于(int i=0;i解析当前json字符串以获取lat和lng:
JSONObject obj = new JSONObject(json);
JSONArray steps = obj.getJSONArray("routes");
for(int i=0;i<steps.length();i++){
JSONObject temp = steps.getJSONObject(i);
// get bounds JSONObject
JSONObject boundsjsonobj = temp.getJSONObject("bounds");
// get northeast JSONObject
JSONObject jsonboj_bounds_northeast= boundsjsonobj.getJSONObject("northeast");
// get northeast lng and lat
String str_northeast_lat=jsonboj_bounds_northeast.getString("lat");
String str_northeast_lng=jsonboj_bounds_northeast.getString("lng");
// get southwest JSONObject
JSONObject jsonboj_bounds_southwest= boundsjsonobj.getJSONObject("southwest");
// get northeast lng and lat
String str_southwest_lat=jsonboj_bounds_southwest.getString("lat");
String str_southwest_lng=jsonboj_bounds_southwest.getString("lng");
//get legs JsonArray from routes
JSONArray jsonarray_legs = temp.getJSONArray("legs");
for(int j=0;j<jsonarray_legs.length();j++){
JSONObject jobjlegs = jsonarray_legs.getJSONObject(j);
// get end_location json object
JSONObject jobjlegs_end_location = jobjlegs.getJSONObject("end_location");
String str_end_location_lat==jobjlegs_end_location.getString("lat");
String str_end_location_lng==jobjlegs_end_location.getString("lng");
// get start_address object
JSONObject jobjlegs_start_address = jobjlegs.getJSONObject("start_address");
String str_start_address_lat==jobjlegs_start_address.getString("lat");
String str_start_address_lng==jobjlegs_start_address.getString("lng");
// get steps jsonArray
JSONArray jsonarray_steps = jobjlegs.getJSONArray("steps");
for(int k=0;k<jsonarray_steps.length();k++){
JSONObject jobjsteps = jsonarray_steps.getJSONObject(k);
// get end_location jsonobject
JSONObject jobjsteps_end_location = jobjsteps.getJSONObject("end_location");
double latend = Double.parseDouble(jobjsteps_end_location.getString("lat"));
double lngend = Double.parseDouble(jobjsteps_end_location.getString("lng"));
endp.add(new GeoPoint((int)(latend *1E6),(int)(lngend * 1E6)));
// get start_location jsonobject
JSONObject jobjsteps_start_location = jobjsteps.getJSONObject("start_location");
double latstart = Double.parseDouble(jobjsteps_start_location.getString("lat"));
double lngstart = Double.parseDouble(jobjsteps_start_location.getString("lng"));
}
}
}
JSONObject obj=新的JSONObject(json);
JSONArray steps=obj.getJSONArray(“路由”);
对于(int i=0;iplz post)您的完整有效jsonI无法在此处添加所有内容,但此处有指向我的json文件的链接Android MapView未使用Google Maps API V3。(标记已删除)plz post您的完整有效jsonI无法在此处添加所有内容,但此处有指向我的json文件的链接Android MapView未使用Google Maps API V3。(标记已删除)我做错了这部分JSONObject obj=new JSONObject(json);因为当我调试时,它会从这里直接进入异常。我需要以任何特殊的方式将链接放到我的json文件中吗?打开这个或什么?@carolajnn:给我你的json的url,因为解析是正确的,这里是新的JSONObject(json);您需要传递从google place api检索到的字符串,而不是json这里您有我的URL我已经弄明白了。我使用了错误的JSONParser,但我改变了,现在工作正常:)我做错了这部分JSONObject obj=新的JSONObject(json);因为当我进行调试时,它会从这里直接进入异常。我需要以任何特殊方式将链接放到我的JSON文件中吗?打开这个或其他吗?@carolajnn:给我你的JSON的url,因为解析是正确的,这里是新的JSONObject(JSON);您需要传递从google place api检索到的字符串,而不是json这里您有我的URL我已经弄明白了。我使用了错误的JSONParser,但我更改了,现在工作正常:)
JSONObject obj = new JSONObject(json);
JSONArray steps = obj.getJSONArray("routes");
for(int i=0;i<steps.length();i++){
JSONObject temp = steps.getJSONObject(i);
// get bounds JSONObject
JSONObject boundsjsonobj = temp.getJSONObject("bounds");
// get northeast JSONObject
JSONObject jsonboj_bounds_northeast= boundsjsonobj.getJSONObject("northeast");
// get northeast lng and lat
String str_northeast_lat=jsonboj_bounds_northeast.getString("lat");
String str_northeast_lng=jsonboj_bounds_northeast.getString("lng");
// get southwest JSONObject
JSONObject jsonboj_bounds_southwest= boundsjsonobj.getJSONObject("southwest");
// get northeast lng and lat
String str_southwest_lat=jsonboj_bounds_southwest.getString("lat");
String str_southwest_lng=jsonboj_bounds_southwest.getString("lng");
//get legs JsonArray from routes
JSONArray jsonarray_legs = temp.getJSONArray("legs");
for(int j=0;j<jsonarray_legs.length();j++){
JSONObject jobjlegs = jsonarray_legs.getJSONObject(j);
// get end_location json object
JSONObject jobjlegs_end_location = jobjlegs.getJSONObject("end_location");
String str_end_location_lat==jobjlegs_end_location.getString("lat");
String str_end_location_lng==jobjlegs_end_location.getString("lng");
// get start_address object
JSONObject jobjlegs_start_address = jobjlegs.getJSONObject("start_address");
String str_start_address_lat==jobjlegs_start_address.getString("lat");
String str_start_address_lng==jobjlegs_start_address.getString("lng");
// get steps jsonArray
JSONArray jsonarray_steps = jobjlegs.getJSONArray("steps");
for(int k=0;k<jsonarray_steps.length();k++){
JSONObject jobjsteps = jsonarray_steps.getJSONObject(k);
// get end_location jsonobject
JSONObject jobjsteps_end_location = jobjsteps.getJSONObject("end_location");
double latend = Double.parseDouble(jobjsteps_end_location.getString("lat"));
double lngend = Double.parseDouble(jobjsteps_end_location.getString("lng"));
endp.add(new GeoPoint((int)(latend *1E6),(int)(lngend * 1E6)));
// get start_location jsonobject
JSONObject jobjsteps_start_location = jobjsteps.getJSONObject("start_location");
double latstart = Double.parseDouble(jobjsteps_start_location.getString("lat"));
double lngstart = Double.parseDouble(jobjsteps_start_location.getString("lng"));
}
}
}