求大神--->百度地图自定义坐标不显示

LatLng p = new LatLng(118.514198,31.676828);
MapStatus mMapStatus = new MapStatus.Builder()
.target(p)
.zoom(12.0f)
.build();
mMapView = new MapView(this,
new BaiduMapOptions().mapStatus(mMapStatus));
setContentView(mMapView);