指南针通常情况下在旋转地图以后才会出现，为了初始化地图就显示，可以通过代码来模拟地图旋转一定的角度，并且onResume()设置mapView.onResume();

private MapView mapView;

private BaiduMap baiduMap;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_overlay);

mapView = (MapView) findViewById(R.id.mapView);

baiduMap = mapView.getMap();

//指南针图标默认的是打开的

baiduMap.getUiSettings().setCompassEnabled(true);

float rotate = -1.0f;

MapStatus mapStatus = new MapStatus.Builder(baiduMap.getMapStatus()).rotate(rotate).build();

MapStatusUpdate mapStatusUpdate = MapStatusUpdateFactory.newMapStatus(mapStatus);

baiduMap.setMapStatus(mapStatusUpdate);

}

@Override

protected void onPostResume() {

super.onPostResume();

mapView.onResume();

}

@Override

protected void onDestroy() {

super.onDestroy();

mapView.onDestroy();

}

转载自：https://blog.csdn.net/niuba123456/article/details/81124719