android - 谷歌地图 Android Studio 不显示我的折线

Question

我不知道为什么这条折线不会显示，我已经放置了谷歌地图API并启用了路线API

PolylineOptions rectOptions = new PolylineOptions();

    rectOptions.add(new LatLng(24.009115, -104.699933));
    rectOptions.add(new LatLng(24.009115, -104.699933));
    rectOptions.width(5);
    rectOptions.color(Color.RED);  

   Polyline polyline = mMap.addPolyline(rectOptions);

Answer 1

Add()、width() 和 color() 均返回带有新设置的 PolylineOptions添加。

PolylineOptions rectOptions = new PolylineOptions();

rectOptions =rectOptions.add(new LatLng(24.009115, -104.699933));
rectOptions =rectOptions.add(new LatLng(24.009115, -104.699933));
rectOptions =rectOptions.width(5);
rectOptions =rectOptions.color(Color.RED);  
Polyline polyline = mMap.addPolyline(rectOptions);

或

PolylineOptions rectOptions = new PolylineOptions()
.add(new LatLng(24.009115,-104.699933),
new latlang(24.009115,-104.699933))
.width(5)
.color(Color.red);
Polyline polyline = mMap.addPolyline(rectOptions);

来源:https://developers.google.com/android/reference/com/google/android/gms/maps/model/PolylineOptions