如何将 JSON 转换为 DirectionsRoute
How to convert JSON to DirectionsRoute
我正在为 Android 使用 mapbox API 开发一个简单的导航器。
我正在使用 https://docs.mapbox.com/playground/directions/ 游乐场创建一些路线，我想使用生成的 JSON 生成一个 DirectionsRoute 对象。
所以我调用 DirectionsRoute.fromJson() 但是当我这样做时，应用程序崩溃并出现此错误：
E/Mbgl-MapChangeReceiver: Exception in onDidFinishLoadingStyle
java.lang.NullPointerException: Null distance
at com.mapbox.api.directions.v5.models.$AutoValue_DirectionsRoute.<init>($AutoValue_DirectionsRoute.java:45)
at com.mapbox.api.directions.v5.models.AutoValue_DirectionsRoute.<init>(AutoValue_DirectionsRoute.java:27)
at com.mapbox.api.directions.v5.models.AutoValue_DirectionsRoute$GsonTypeAdapter.read(AutoValue_DirectionsRoute.java:260)
at com.mapbox.api.directions.v5.models.AutoValue_DirectionsRoute$GsonTypeAdapter.read(AutoValue_DirectionsRoute.java:30)
at com.google.gson.Gson.fromJson(Gson.java:932)
at com.google.gson.Gson.fromJson(Gson.java:897)
at com.google.gson.Gson.fromJson(Gson.java:846)
at com.google.gson.Gson.fromJson(Gson.java:817)
at com.mapbox.api.directions.v5.models.DirectionsRoute.fromJson(DirectionsRoute.java:172)
at eu.mediator.hmi.cluster2.navigator.Nav.getDirectionsRoute(Nav.kt:108)
at eu.mediator.hmi.cluster2.navigator.Nav.access$getDirectionsRoute(Nav.kt:15)
at eu.mediator.hmi.cluster2.navigator.Nav$route.invoke(Nav.kt:19)
at eu.mediator.hmi.cluster2.navigator.Nav$route.invoke(Nav.kt:19)
at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
at eu.mediator.hmi.cluster2.navigator.Nav.getRoute(Nav.kt:19)
at eu.mediator.hmi.cluster2.navigator.Nav.onNavigationReady(Nav.kt:83)
at com.mapbox.navigation.ui.NavigationView.updateNavigationReadyListeners(NavigationView.java:701)
at com.mapbox.navigation.ui.NavigationView.lambda$onMapReady[=11=]$NavigationView(NavigationView.java:261)
at com.mapbox.navigation.ui.-$$Lambda$NavigationView$cQ4pEaxGsKIc0JZPsHECDoNZqgE.onStyleLoaded(Unknown Source:4)
at com.mapbox.mapboxsdk.maps.MapboxMap.notifyStyleLoaded(MapboxMap.java:963)
at com.mapbox.mapboxsdk.maps.MapboxMap.onFinishLoadingStyle(MapboxMap.java:225)
at com.mapbox.mapboxsdk.maps.MapView$MapCallback.onDidFinishLoadingStyle(MapView.java:1383)
at com.mapbox.mapboxsdk.maps.MapChangeReceiver.onDidFinishLoadingStyle(MapChangeReceiver.java:198)
at com.mapbox.mapboxsdk.maps.NativeMapView.onDidFinishLoadingStyle(NativeMapView.java:1166)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:326)
at android.os.Looper.loop(Looper.java:160)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
这是我要解析的 json 的示例：
{
"routes": [
{
"weight_name": "auto",
"weight": 296.434,
"duration": 220.762,
"distance": 706.383,
"legs": [
{
"admins": [{"iso_3166_1_alpha3": "USA", "iso_3166_1": "US"}],
"weight": 296.434,
"duration": 220.762,
"steps": [
{
"intersections": [
{
"entry": [true],
"bearings": [299],
"duration": 1.309,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 1.539,
"geometry_index": 0,
"location": [-73.992199, 40.734505]
},
{
"entry": [false, true],
"in": 0,
"bearings": [119, 299],
"duration": 58.966,
"turn_weight": 2,
"turn_duration": 2.021,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 68.911,
"geometry_index": 1,
"location": [-73.992255, 40.734529]
},
{
"bearings": [119, 299],
"entry": [false, true],
"in": 0,
"turn_weight": 2,
"turn_duration": 0.021,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"geometry_index": 2,
"location": [-73.994055, 40.735287]
}
],
"maneuver": {
"type": "depart",
"instruction": "Drive northwest on East 13th Street.",
"bearing_after": 299,
"bearing_before": 0,
"location": [-73.992199, 40.734505]
},
"name": "East 13th Street",
"duration": 62.26,
"distance": 185.82,
"driving_side": "right",
"weight": 74.757,
"mode": "driving",
"geometry": "qqfulAl_cclCo@nBkn@noBs@|B"
},
{
"intersections": [
{
"entry": [false, true],
"in": 0,
"bearings": [119, 210],
"duration": 8.377,
"turn_weight": 22.5,
"turn_duration": 7.395,
"mapbox_streets_v8": {"class": "secondary"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 23.654,
"geometry_index": 3,
"location": [-73.994118, 40.735313]
},
{
"entry": [false, true],
"in": 0,
"bearings": [30, 210],
"duration": 11.134,
"turn_weight": 2,
"turn_duration": 0.007,
"mapbox_streets_v8": {"class": "secondary"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 15.075,
"geometry_index": 4,
"location": [-73.994156, 40.735263]
},
{
"bearings": [30, 210],
"entry": [false, true],
"in": 0,
"turn_weight": 2,
"turn_duration": 0.007,
"mapbox_streets_v8": {"class": "secondary"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"geometry_index": 5,
"location": [-73.994562, 40.734732]
}
],
"maneuver": {
"type": "turn",
"instruction": "Turn left onto 5th Avenue.",
"modifier": "left",
"bearing_after": 210,
"bearing_before": 299,
"location": [-73.994118, 40.735313]
},
"name": "5th Avenue",
"duration": 20.663,
"distance": 81,
"driving_side": "right",
"weight": 42.074,
"mode": "driving",
"geometry": "adhulAjwfclCbBjAd`@jXdBlA"
},
{
"intersections": [
{
"entry": [false, true],
"in": 0,
"bearings": [30, 121],
"duration": 9.332,
"turn_weight": 12.5,
"turn_duration": 7.275,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 14.917,
"geometry_index": 6,
"location": [-73.994601, 40.734681]
},
{
"entry": [true, false],
"in": 1,
"bearings": [118, 301],
"duration": 1.051,
"turn_weight": 2,
"turn_duration": 0.022,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 3.209,
"geometry_index": 7,
"location": [-73.994524, 40.734646]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 298],
"duration": 39.865,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 48.832,
"geometry_index": 8,
"location": [-73.994484, 40.73463]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 2.065,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 4.417,
"geometry_index": 9,
"location": [-73.992878, 40.733958]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 4.626,
"turn_weight": 2,
"turn_duration": 2.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 5.076,
"geometry_index": 10,
"location": [-73.992792, 40.733922]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 47.135,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 57.375,
"geometry_index": 11,
"location": [-73.992714, 40.733889]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 3.608,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 6.23,
"geometry_index": 12,
"location": [-73.991224, 40.73326]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 4.5,
"turn_weight": 2,
"turn_duration": 2.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 4.928,
"geometry_index": 13,
"location": [-73.991114, 40.733214]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 14.962,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 19.571,
"geometry_index": 14,
"location": [-73.991019, 40.733174]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 7.762,
"turn_weight": 0.5,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 9.611,
"geometry_index": 15,
"location": [-73.990465, 40.732939]
},
{
"bearings": [119, 299],
"entry": [true, false],
"in": 1,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"geometry_index": 16,
"location": [-73.990173, 40.732817]
}
],
"maneuver": {
"type": "turn",
"instruction": "Turn left onto East 12th Street.",
"modifier": "left",
"bearing_after": 121,
"bearing_before": 210,
"location": [-73.994601, 40.734681]
},
"name": "East 12th Street",
"duration": 137.839,
"distance": 439.563,
"driving_side": "right",
"weight": 179.603,
"mode": "driving",
"geometry": "q|fulApugclCdAyC^oA~h@kcBfAkD`A{Chf@c|AzA{EnA}DtMsa@rFgQ`@oAx@kC"
},
{
"intersections": [
{
"bearings": [299],
"entry": [true],
"in": 0,
"admin_index": 0,
"geometry_index": 18,
"location": [-73.990063, 40.732771]
}
],
"maneuver": {
"type": "arrive",
"instruction": "Your destination is on the right.",
"modifier": "right",
"bearing_after": 0,
"bearing_before": 119,
"location": [-73.990063, 40.732771]
},
"name": "East 12th Street",
"duration": 0,
"distance": 0,
"driving_side": "right",
"weight": 0,
"mode": "driving",
"geometry": "eeculA|y~blC??"
}
],
"distance": 706.383,
"summary": "East 13th Street, East 12th Street"
}
],
"geometry": "qqfulAl_cclCoq@|vBnf@d]jvBszG"
}
],
"waypoints": [
{
"distance": 2.275,
"name": "East 13th Street",
"location": [-73.992199, 40.734505]
},
{
"distance": 4.846,
"name": "East 12th Street",
"location": [-73.990063, 40.732771]
}
],
"code": "Ok",
"uuid": "iN7DOXpeBlZLl3bHqiFcXZinCTs9_4miufia3aF9gVodZF3QZ-c0lQ=="
}
mapbox API 的响应不是 DirectionsRoute。它是 DirectionsResponse，一个看起来像这样的结构：
{
"routes":[ ... ],
"waypoints":[ ... ],
"code":"Ok",
"uuid":"iN7DOXpeBlZLl3bHqiFcXZinCTs9_4miufia3aF9gVodZF3QZ-c0lQ=="
}
所以你不能用DirectionsRoute.fromJson()
解析这个
响应包含 DirectionsRoute 的列表，在 "routes" 属性 中。通常第一个是被使用的那个。解析这个使用
directionsResponse = DirectionsResponse.fromJson();
然后你可以像这样在响应中得到第一条路线：
DirectionsRoute route = directionsResponse.routes().get(0);
我正在为 Android 使用 mapbox API 开发一个简单的导航器。
我正在使用 https://docs.mapbox.com/playground/directions/ 游乐场创建一些路线，我想使用生成的 JSON 生成一个 DirectionsRoute 对象。
所以我调用 DirectionsRoute.fromJson() 但是当我这样做时，应用程序崩溃并出现此错误：
E/Mbgl-MapChangeReceiver: Exception in onDidFinishLoadingStyle
java.lang.NullPointerException: Null distance
at com.mapbox.api.directions.v5.models.$AutoValue_DirectionsRoute.<init>($AutoValue_DirectionsRoute.java:45)
at com.mapbox.api.directions.v5.models.AutoValue_DirectionsRoute.<init>(AutoValue_DirectionsRoute.java:27)
at com.mapbox.api.directions.v5.models.AutoValue_DirectionsRoute$GsonTypeAdapter.read(AutoValue_DirectionsRoute.java:260)
at com.mapbox.api.directions.v5.models.AutoValue_DirectionsRoute$GsonTypeAdapter.read(AutoValue_DirectionsRoute.java:30)
at com.google.gson.Gson.fromJson(Gson.java:932)
at com.google.gson.Gson.fromJson(Gson.java:897)
at com.google.gson.Gson.fromJson(Gson.java:846)
at com.google.gson.Gson.fromJson(Gson.java:817)
at com.mapbox.api.directions.v5.models.DirectionsRoute.fromJson(DirectionsRoute.java:172)
at eu.mediator.hmi.cluster2.navigator.Nav.getDirectionsRoute(Nav.kt:108)
at eu.mediator.hmi.cluster2.navigator.Nav.access$getDirectionsRoute(Nav.kt:15)
at eu.mediator.hmi.cluster2.navigator.Nav$route.invoke(Nav.kt:19)
at eu.mediator.hmi.cluster2.navigator.Nav$route.invoke(Nav.kt:19)
at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
at eu.mediator.hmi.cluster2.navigator.Nav.getRoute(Nav.kt:19)
at eu.mediator.hmi.cluster2.navigator.Nav.onNavigationReady(Nav.kt:83)
at com.mapbox.navigation.ui.NavigationView.updateNavigationReadyListeners(NavigationView.java:701)
at com.mapbox.navigation.ui.NavigationView.lambda$onMapReady[=11=]$NavigationView(NavigationView.java:261)
at com.mapbox.navigation.ui.-$$Lambda$NavigationView$cQ4pEaxGsKIc0JZPsHECDoNZqgE.onStyleLoaded(Unknown Source:4)
at com.mapbox.mapboxsdk.maps.MapboxMap.notifyStyleLoaded(MapboxMap.java:963)
at com.mapbox.mapboxsdk.maps.MapboxMap.onFinishLoadingStyle(MapboxMap.java:225)
at com.mapbox.mapboxsdk.maps.MapView$MapCallback.onDidFinishLoadingStyle(MapView.java:1383)
at com.mapbox.mapboxsdk.maps.MapChangeReceiver.onDidFinishLoadingStyle(MapChangeReceiver.java:198)
at com.mapbox.mapboxsdk.maps.NativeMapView.onDidFinishLoadingStyle(NativeMapView.java:1166)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:326)
at android.os.Looper.loop(Looper.java:160)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
这是我要解析的 json 的示例：
{
"routes": [
{
"weight_name": "auto",
"weight": 296.434,
"duration": 220.762,
"distance": 706.383,
"legs": [
{
"admins": [{"iso_3166_1_alpha3": "USA", "iso_3166_1": "US"}],
"weight": 296.434,
"duration": 220.762,
"steps": [
{
"intersections": [
{
"entry": [true],
"bearings": [299],
"duration": 1.309,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 1.539,
"geometry_index": 0,
"location": [-73.992199, 40.734505]
},
{
"entry": [false, true],
"in": 0,
"bearings": [119, 299],
"duration": 58.966,
"turn_weight": 2,
"turn_duration": 2.021,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 68.911,
"geometry_index": 1,
"location": [-73.992255, 40.734529]
},
{
"bearings": [119, 299],
"entry": [false, true],
"in": 0,
"turn_weight": 2,
"turn_duration": 0.021,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"geometry_index": 2,
"location": [-73.994055, 40.735287]
}
],
"maneuver": {
"type": "depart",
"instruction": "Drive northwest on East 13th Street.",
"bearing_after": 299,
"bearing_before": 0,
"location": [-73.992199, 40.734505]
},
"name": "East 13th Street",
"duration": 62.26,
"distance": 185.82,
"driving_side": "right",
"weight": 74.757,
"mode": "driving",
"geometry": "qqfulAl_cclCo@nBkn@noBs@|B"
},
{
"intersections": [
{
"entry": [false, true],
"in": 0,
"bearings": [119, 210],
"duration": 8.377,
"turn_weight": 22.5,
"turn_duration": 7.395,
"mapbox_streets_v8": {"class": "secondary"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 23.654,
"geometry_index": 3,
"location": [-73.994118, 40.735313]
},
{
"entry": [false, true],
"in": 0,
"bearings": [30, 210],
"duration": 11.134,
"turn_weight": 2,
"turn_duration": 0.007,
"mapbox_streets_v8": {"class": "secondary"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 15.075,
"geometry_index": 4,
"location": [-73.994156, 40.735263]
},
{
"bearings": [30, 210],
"entry": [false, true],
"in": 0,
"turn_weight": 2,
"turn_duration": 0.007,
"mapbox_streets_v8": {"class": "secondary"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"geometry_index": 5,
"location": [-73.994562, 40.734732]
}
],
"maneuver": {
"type": "turn",
"instruction": "Turn left onto 5th Avenue.",
"modifier": "left",
"bearing_after": 210,
"bearing_before": 299,
"location": [-73.994118, 40.735313]
},
"name": "5th Avenue",
"duration": 20.663,
"distance": 81,
"driving_side": "right",
"weight": 42.074,
"mode": "driving",
"geometry": "adhulAjwfclCbBjAd`@jXdBlA"
},
{
"intersections": [
{
"entry": [false, true],
"in": 0,
"bearings": [30, 121],
"duration": 9.332,
"turn_weight": 12.5,
"turn_duration": 7.275,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 1,
"weight": 14.917,
"geometry_index": 6,
"location": [-73.994601, 40.734681]
},
{
"entry": [true, false],
"in": 1,
"bearings": [118, 301],
"duration": 1.051,
"turn_weight": 2,
"turn_duration": 0.022,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 3.209,
"geometry_index": 7,
"location": [-73.994524, 40.734646]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 298],
"duration": 39.865,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 48.832,
"geometry_index": 8,
"location": [-73.994484, 40.73463]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 2.065,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 4.417,
"geometry_index": 9,
"location": [-73.992878, 40.733958]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 4.626,
"turn_weight": 2,
"turn_duration": 2.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 5.076,
"geometry_index": 10,
"location": [-73.992792, 40.733922]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 47.135,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 57.375,
"geometry_index": 11,
"location": [-73.992714, 40.733889]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 3.608,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 6.23,
"geometry_index": 12,
"location": [-73.991224, 40.73326]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 4.5,
"turn_weight": 2,
"turn_duration": 2.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 4.928,
"geometry_index": 13,
"location": [-73.991114, 40.733214]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 14.962,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 19.571,
"geometry_index": 14,
"location": [-73.991019, 40.733174]
},
{
"entry": [true, false],
"in": 1,
"bearings": [119, 299],
"duration": 7.762,
"turn_weight": 0.5,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"weight": 9.611,
"geometry_index": 15,
"location": [-73.990465, 40.732939]
},
{
"bearings": [119, 299],
"entry": [true, false],
"in": 1,
"turn_weight": 2,
"turn_duration": 0.008,
"mapbox_streets_v8": {"class": "street"},
"is_urban": true,
"admin_index": 0,
"out": 0,
"geometry_index": 16,
"location": [-73.990173, 40.732817]
}
],
"maneuver": {
"type": "turn",
"instruction": "Turn left onto East 12th Street.",
"modifier": "left",
"bearing_after": 121,
"bearing_before": 210,
"location": [-73.994601, 40.734681]
},
"name": "East 12th Street",
"duration": 137.839,
"distance": 439.563,
"driving_side": "right",
"weight": 179.603,
"mode": "driving",
"geometry": "q|fulApugclCdAyC^oA~h@kcBfAkD`A{Chf@c|AzA{EnA}DtMsa@rFgQ`@oAx@kC"
},
{
"intersections": [
{
"bearings": [299],
"entry": [true],
"in": 0,
"admin_index": 0,
"geometry_index": 18,
"location": [-73.990063, 40.732771]
}
],
"maneuver": {
"type": "arrive",
"instruction": "Your destination is on the right.",
"modifier": "right",
"bearing_after": 0,
"bearing_before": 119,
"location": [-73.990063, 40.732771]
},
"name": "East 12th Street",
"duration": 0,
"distance": 0,
"driving_side": "right",
"weight": 0,
"mode": "driving",
"geometry": "eeculA|y~blC??"
}
],
"distance": 706.383,
"summary": "East 13th Street, East 12th Street"
}
],
"geometry": "qqfulAl_cclCoq@|vBnf@d]jvBszG"
}
],
"waypoints": [
{
"distance": 2.275,
"name": "East 13th Street",
"location": [-73.992199, 40.734505]
},
{
"distance": 4.846,
"name": "East 12th Street",
"location": [-73.990063, 40.732771]
}
],
"code": "Ok",
"uuid": "iN7DOXpeBlZLl3bHqiFcXZinCTs9_4miufia3aF9gVodZF3QZ-c0lQ=="
}
mapbox API 的响应不是 DirectionsRoute。它是 DirectionsResponse，一个看起来像这样的结构：
{
"routes":[ ... ],
"waypoints":[ ... ],
"code":"Ok",
"uuid":"iN7DOXpeBlZLl3bHqiFcXZinCTs9_4miufia3aF9gVodZF3QZ-c0lQ=="
}
所以你不能用DirectionsRoute.fromJson()
响应包含 DirectionsRoute 的列表，在 "routes" 属性 中。通常第一个是被使用的那个。解析这个使用
directionsResponse = DirectionsResponse.fromJson();
然后你可以像这样在响应中得到第一条路线：
DirectionsRoute route = directionsResponse.routes().get(0);