class Route {
    private ArrayList<Location> locations;
    @PropertyName("route")
    public ArrayList<Location> getLocations() {
       return locations;
    }
    @PropertyName("route")
    public void setLocations(ArrayList<Locations> locations) {
        this.locations = locations;
    }
}


class Location{ 
    private Double latitude;
    private Double longitude;

    //getter and setter for lat - long 
}

然后您可以将它们用作

public void onDataChange(DataSnapshot dataSnapshot) {
     Route route = dataSnapshot.getValue(Route.class);
}

现在，您可以根据需要使用检索到的数据.

Now you can use the data retrieved as you want.

工作代码:

public class RouteActivity extends AppCompatActivity {

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

    FirebaseDatabase.getInstance().getReference("Route").addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Route route = dataSnapshot.getValue(Route.class);

            for(Location location : route.getLocations() ) {
                Log.d("***", location.getLatitude()+","+location.getLongitude());
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

}

public static class Route {

    private ArrayList<Location> locations;

    public Route() {

    }

    @PropertyName("route")
    public ArrayList<Location> getLocations() {
        return locations;
    }
    @PropertyName("route")
    public void setLocations(ArrayList<Location> locations) {
        this.locations = locations;
    }
}


public static class Location{
    private Double latitude;
    private Double longitude;

    //getter and setter for lat - long

    public Location() {

    }

    public Double getLatitude() {
        return latitude;
    }

    public void setLatitude(Double latitude) {
        this.latitude = latitude;
    }

    public Double getLongitude() {
        return longitude;
    }

    public void setLongitude(Double longitude) {
        this.longitude = longitude;
    }
}
}

这是我正在查询的Firebase节点

This is firebase node I am querying

输出: D/***:55.39,10.33D/堆栈溢出:65.39,13.33D/堆栈溢出:35.39,16.33D/堆栈溢出:85.39,12.33D/堆栈溢出:25.39,17.33D/***:57.39,61.33