Question

加载MapFragment时出现问题。在手机的屏幕上，它什么都不显示。

公共类MapsActivity扩展了FragmentActivity {

private GoogleMap mMap; // Might be null if Google Play services APK is not available.
protected ArrayList<GPSPoint> coord = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    //setUpMapIfNeeded();
    mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
            .getMap();
    LatLng HAMBURG = new LatLng(53.558, 9.927);
    Marker hamburg = mMap.addMarker(new MarkerOptions().position(HAMBURG)
            .title("Hamburg"));
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));


}

Answer 1

mapFragment =（MapFragment）getFragmentManager（） .findFragmentById（R.id.map）;
mapFragment.getMapAsync（本）;
这对我有用

Answer 2

尝试类似的东西：

 public class MainActivity extends FragmentActivity {

 private final LatLng STARTING_POINT=new LatLng(45.464711, 9.188736);

 @Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   GoogleMap map=((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
   map.moveCamera(CameraUpdateFactory.newLatLngZoom(STARTING_POINT, 5));
 }
}

缩放地图：

map.animateCamera(CameraUpdateFactory.zoomTo(15), 2000, null);

添加图钉：

// Default pin
map.addMarker(new MarkerOptions().position(STARTING_POINT));

// Custom pin
map.addMarker(new MarkerOptions().position(STARTING_POINT).icon(BitmapDescriptorFactory.fromResource(R.drawable.ic_launcher)));

P.S。首先，您需要获取API密钥，在Google Developer Console中启用Google Maps API并修改您的应用的清单，设置相应的权限。 Yuo做到了，对吧？

如何使用Google Map API加载地图？

2 个答案: