如何在Fragment中获取Google Maps对象

Question

我在我的应用程序中使用片段,我是新手.有一个片段,我想要显示谷歌地图,并希望得到它的对象,为此,我有一个XML片段,我想在片段本身膨胀它.当我试图给地图视图充气时,它会向我显示getSupportFragmentManager()的错误.

如何获取地图对象然后这是主要问题.我的XML是这样的: -

 <fragment
                android:id="@+id/map"
                android:layout_width="match_parent"
                android:layout_height="250dp"
                class="com.google.android.gms.maps.SupportMapFragment" />

而我想要获取谷歌地图对象的片段是这样的: -

public class FindMyCar extends Fragment {

    private TextView mTvFind;
    private TextView mTvPark;
    private EditText mEtParkHint;

    private GoogleMap map;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View view = inflater.inflate(R.layout.findmycar, null);

        initViews(view);

        Typeface type = Typeface.createFromAsset(getActivity().getResources().getAssets(),"Multicolore.otf"); 
        mTvFind.setTypeface(type);
        mTvPark.setTypeface(type);
        mEtParkHint.setTypeface(type);

        SupportMapFragment fm = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);


        return view;
    }


    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }


    @Override
    public void onDestroy() {
        super.onDestroy();
    }


    private void initViews(View view){


        mTvPark = (TextView) view.findViewById(R.id.tvFindCarPark);
        mTvFind = (TextView) view.findViewById(R.id.tvFindCar);
        mEtParkHint = (EditText) view.findViewById(R.id.etParkHint);
    }

有人可以帮助我获取地图的对象,以便我可以显示当前位置并在那里绘制标记.

任何帮助都会很明显.提前致谢.

Answer 1

试试这个

 GoogleMap map = ((SupportMapFragment) getFragmentManager()
                .findFragmentById(R.id.map)).getMap();

并在你的xml中

<fragment
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    class="com.google.android.gms.maps.SupportMapFragment" />

Answer 2

getMap()方法被删除

getMap()方法是折旧的,但在play-services 9.2删除之后,最好使用getMapAsync().只有在您不愿意play-services 9.2为应用程序更新时,您仍然可以使用getMap().

要使用getMapAsync(),请OnMapReadyCallback在您的活动或片段上实现接口:

对于片段

public class MapFragment extends android.support.v4.app.Fragment
      implements OnMapReadyCallback { }
Then, while initializing the map, use getMapAsync() instead of getMap():


//call this method in your onCreateMethod
 private void initializeMap() {
  if (mMap == null) {
    SupportMapFragment mapFrag = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.fragment_map);
    mapFrag.getMapAsync(this);
  }
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    setUpMap();// do your map stuff here
}

对于活动

public class MapActivity extends FragmentActivity
      implements OnMapReadyCallback { }
Then, while initializing the map, use getMapAsync() instead of getMap():


//call this method in your onCreateMethod
 private void initializeMap() {
  if (mMap == null) {
    SupportMapFragment mapFrag = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_map);
    mapFrag.getMapAsync(this);
  }
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    setUpMap();// do your map stuff here
}

xml片段

   <fragment  xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

Answer 3

试试这个适用于我的方法 如何使用ViewPager将Google Maps V2放在片段上

<Fragment
            android:id="@+id/map"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            class="com.google.android.gms.maps.SupportMapFragment" />

GoogleMap mGoogleMap = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map)).getMap();