实现将谷歌的方向解析为Java模型类。
HttpRequest request = requestFactory.buildGetRequest(url);
HttpResponse httpResponse = request.execute();
DirectionsResult directionsResult=httpResponse.parseAs(DirectionsResult.class);
...
public static class DirectionsResult {
@Key
public List<Route> routes;
}
public static class Route {
@Key
public List<Leg> legs;
}
public static class Leg {
@Key
public Distance distance;
@Key
public Duration duration;
}
public static class Distance
{
@Key
public String text;
}
public static class Duration
{
@Key
public String text;
}
...
对于访问数据，我可以使用：
Log.d(TAG,"directions result distance text: "+directionsResult.routes.get(0).legs.get(0).distance.text);
我的问题是如何创建名为DirectionsResult的单独顶级类并访问其成员变量？
我尝试模仿顶级类的静态类行为但没有成功，却出现错误......
答案 0 :(得分：0)
您创建一个新的Java文件DirectionResults.java。您完全按原样复制类，从声明该类的行中删除关键字static。添加正常的包行和任何所需的导入。这就是你应该做的所有事情。
public class DirectionsResult {
@Key
public List<Route> routes;
}
答案 1 :(得分：0)
@Gabe Sechan：我已经尝试过了，我得到了以下错误：
03-12 20:04:14.159 12525-12917/com.rootcave.roadpal W/System.err: java.lang.IllegalArgumentException: key value
03-12 20:04:14.159 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:880)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parse(JsonParser.java:381)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parse(JsonParser.java:354)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:87)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:81)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.http.HttpResponse.parseAs(HttpResponse.java:459)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.rootcave.roadpal.ride.createRide.CreateRideInteractorImpl$DirectionsFetcher.doInBackground(CreateRideInteractorImpl.java:231)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.rootcave.roadpal.ride.createRide.CreateRideInteractorImpl$DirectionsFetcher.doInBackground(CreateRideInteractorImpl.java:189)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at java.lang.Thread.run(Thread.java:856)
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: Caused by: java.lang.IllegalArgumentException: key value, field public java.util.List com.rootcave.roadpal.ride.createRide.DirectionsResultModel.routes
03-12 20:04:14.163 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:880)
03-12 20:04:14.167 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parse(JsonParser.java:471)
03-12 20:04:14.167 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:780)
03-12 20:04:14.167 12525-12917/com.rootcave.roadpal W/System.err: ... 14 more
03-12 20:04:14.167 12525-12917/com.rootcave.roadpal W/System.err: Caused by: java.lang.IllegalArgumentException: key value, field public java.util.List com.rootcave.roadpal.ride.createRide.DirectionsResultModel.routes
03-12 20:04:14.171 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:880)
03-12 20:04:14.171 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseArray(JsonParser.java:647)
03-12 20:04:14.171 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:739)
03-12 20:04:14.171 12525-12917/com.rootcave.roadpal W/System.err: ... 16 more
03-12 20:04:14.171 12525-12917/com.rootcave.roadpal W/System.err: Caused by: java.lang.IllegalArgumentException: key value, field public java.util.List com.rootcave.roadpal.ride.createRide.DirectionsResultModel$Route.legs
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:880)
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parse(JsonParser.java:471)
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:780)
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: ... 18 more
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: Caused by: java.lang.IllegalArgumentException: key value, field public java.util.List com.rootcave.roadpal.ride.createRide.DirectionsResultModel$Route.legs
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:880)
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseArray(JsonParser.java:647)
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:739)
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: ... 20 more
03-12 20:04:14.175 12525-12917/com.rootcave.roadpal W/System.err: Caused by: java.lang.IllegalArgumentException: key value, field public com.rootcave.roadpal.ride.createRide.DirectionsResultModel$Distance com.rootcave.roadpal.ride.createRide.DirectionsResultModel$Leg.distance
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:880)
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parse(JsonParser.java:471)
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:780)
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: ... 22 more
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: Caused by: java.lang.IllegalArgumentException: key value, field public java.lang.String com.rootcave.roadpal.ride.createRide.DirectionsResultModel$Distance.value
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:880)
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parse(JsonParser.java:471)
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:780)
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: ... 24 more
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: Caused by: java.lang.IllegalArgumentException: expected numeric type but got class java.lang.String
03-12 20:04:14.179 12525-12917/com.rootcave.roadpal W/System.err: at com.google.api.client.json.JsonParser.parseValue(JsonParser.java:843)
03-12 20:04:14.183 12525-12917/com.rootcave.roadpal W/System.err: ... 26 more
此行发生错误：
DirectionsResultModel directionsResultModel = httpResponse.parseAs(DirectionsResultModel.class);
这是我试图解析的json响应，我对旅行距离和旅行持续时间字段感兴趣：
http response parse as string: {
"geocoded_waypoints" : [
{
"geocoder_status" : "OK",
"place_id" : "ChIJhQEXk8ZXY0cRUnc0gzfpLX0",
"types" : [ "locality", "political" ]
},
{
"geocoder_status" : "OK",
"place_id" : "ChIJj7jA0mL6YUcRhAf0Exw-MhI",
"types" : [ "locality", "political" ]
}
],
"routes" : [
{
"bounds" : {
"northeast" : {
"lat" : 45.3581754,
"lng" : 15.543227
},
"southwest" : {
"lat" : 44.118924,
"lng" : 14.2724169
}
},
"copyrights" : "Map data ©2016 Google",
"legs" : [
{
"distance" : {
"text" : "243 km",
"value" : 243413
},
"duration" : {
"text" : "4 hours 2 mins",
"value" : 14529
},
"end_address" : "Zadar, Croatia",
"end_location" : {
"lat" : 44.117578,
"lng" : 15.219711
},
"start_address" : "Lovran, Croatia",
"start_location" : {
"lat" : 45.2969573,
"lng" : 14.2724169
},
"steps" : [
{
"distance" : {
"text" : "0.1 km",
"value" : 136
},
"duration" : {
"text" : "1 min",
"value" : 28
},
"end_location" : {
"lat" : 45.2961227,
"lng" : 14.2724438
},
"html_instructions" : "Head \u003cb\u003esoutheast\u003c/b\u003e on \u003cb\u003eLokva ul.\u003c/b\u003e",
"polyline" : {
"points" : "_ansGsqbvADGb@i@P[DYBE?AHGH?LBHDXp@Zv@"
},
"start_location" : {
"lat" : 45.2969573,
"lng" : 14.2724169
},
"travel_mode" : "DRIVING"
},
{
"distance" : {
"text" : "66 m",
"value" : 66
},
"duration" : {
"text" : "1 min",
"value" : 18
},
"end_location" : {
"lat" : 45.2956534,
"lng" : 14.2729462
},
"html_instructions" : "Turn \u003cb\u003eleft\u003c/b\u003e toward \u003cb\u003eUl. dr. Nilo cara\u003c/b\u003e",
"maneuver" : "turn-left",
"polyline" : {
"points" : "w{msGwqbvA@CTYXc@RQVQ"
},
"start_location" : {
"lat" : 45.2961227,
"lng" : 14.2724438
},
"travel_mode" : "DRIVING"
},
{
"distance" : {
"text" : "0.7 km",
"value" : 671
},
"duration" : {
"text" : "2 mins",
"value" : 144
},
"end_location" : {
"lat" : 45.2968208,
"lng" : 14.2758713
},
"html_instructions" : "Turn \u003cb\u003eleft\u003c/b\u003e onto \u003cb\u003eUl. dr. Nilo cara\u003c/b\u003e",
"maneuver" : "turn-left",
"polyline" : {
"points" : "yxmsG}tbvAE]AO@[BW?SAYCQCIIOOOOEaAGUCsACi@EUEKIGKCKAO?OBSHMHKPKp@MdAOdB]|A[LKBK@E?KAIQ
编辑：即时通讯使用android studio
编辑： 这是一个非常简单的错误，这是班级的最终结果：
public class DirectionsResultModel {
@Key("routes")
private List<Route> routes;
public List<Route> getRoutes() {
return routes;
}
public static class Route {
@Key("legs")
private List<Leg> legs;
public List<Leg> getLegs() {return legs;}
}
public static class Leg {
@Key("distance")
private Distance distance;
@Key("duration")
private Duration duration;
public Distance getDistance() {
return distance;
}
public Duration getDuration() {
return duration;
}
}
public static class Distance {
@Key
private String text;
@Key
private int value;
public int getValue() {return value;}
public String getText() {return text;}
}
public static class Duration {
@Key
private String text;
@Key
private int value;
public String getText() {return text;}
public int getValue() {return value;}
}
}
谢谢大家！