高德 android 红绿灯 倒计时

在 Android 平台上使用高德地图 SDK 实现红绿灯倒计时可以通过以下步骤完成：

1. 在项目的 `build.gradle` 文件中添加高德地图 SDK 的依赖：

   implementation 'com.amap.api:maps:5.5.0'

2. 在布局文件中添加地图控件：

   <com.amap.api.maps.MapView
       android:id="@+id/map_view"
       android:layout_width="match_parent"
       android:layout_height="match_parent" />

3. 在 Activity 中初始化地图控件和 AMap 对象：

   private MapView mMapView;
   private AMap mAMap;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       mMapView = findViewById(R.id.map_view);
       mMapView.onCreate(savedInstanceState);

       mAMap = mMapView.getMap();
   }

   @Override
   protected void onResume() {
       super.onResume();
       mMapView.onResume();
   }

   @Override
   protected void onPause() {
       super.onPause();
       mMapView.onPause();
   }

   @Override
   protected void onDestroy() {
       super.onDestroy();
       mMapView.onDestroy();
   }

4. 在地图加载完成后获取当前位置的红绿灯倒计时信息：

   mAMap.setOnMapLoadedListener(new AMap.OnMapLoadedListener() {
       @Override
       public void onMapLoaded() {
           LatLng latLng = mAMap.getCameraPosition().target;
           getTrafficInfo(latLng);
       }
   });

   private void getTrafficInfo(LatLng latLng) {
       TrafficSearch search = new TrafficSearch(this);
       search.setTrafficSearchListener(new TrafficSearch.OnTrafficSearchListener() {
           @Override
           public void onRoadTrafficSearched(TrafficStatusResult trafficStatusResult, int errorCode) {
               if (errorCode == AMapException.CODE_AMAP_SUCCESS) {
                   List<TrafficStatus> trafficStatusList = trafficStatusResult.getRoadTrafficStatuses();

                   if (trafficStatusList != null && trafficStatusList.size() > 0) {
                       TrafficStatus trafficStatus = trafficStatusList.get(0);
                       List<TrafficStatusInfo> lightInfos = trafficStatus.getTrafficStatusInfo();

                       if (lightInfos != null && lightInfos.size() > 0) {
                           TrafficStatusInfo lightInfo = lightInfos.get(0);
                           String status = lightInfo.getStatusDesc();
                           int remainTime = lightInfo.getRemainTime();

                           Log.i("TAG", "状态：" + status + "，倒计时：" + remainTime + "秒");
                       }
                   }
               }
           }

           @Override
           public void onBusTrafficSearched(BusTrafficStatusResult busTrafficStatusResult, int i) {

           }

           @Override
           public void onDriveRouteTrafficSearched(DriveRouteTrafficStatusResult driveRouteTrafficStatusResult, int i) {

           }

           @Override
           public void onWalkRouteTrafficSearched(WalkRouteTrafficStatusResult walkRouteTrafficStatusResult, int i) {

           }
       });

       TrafficStatusQuery query = new TrafficStatusQuery(latLng, TrafficStatusQuery.RoadLevel.ROAD_LEVEL_ALL);
       search.queryTrafficStatus(query);
   }

通过以上步骤，就可以在 Android 平台上使用高德地图 SDK 实现红绿灯倒计时了。