我在我的应用程序中使用片段，我是新手。有一个片段，我想在其中显示谷歌地图并想要获取其对象，为此，我的 XML 中有一个片段，我想在片段本身中膨胀它。当我尝试膨胀地图视图时，它向我显示错误 getSupportFragmentManager（）。
我如何获取地图对象，那么这是主要问题。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" />
我想在其中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。
任何帮助都是可观的。提前谢谢。
getMap（） 方法已弃用
getMap()方法已被弃用，但在play-services 9.2后将其删除，因此最好使用 getMapAsync（）。仅当您不愿意更新应用程序的play-services 9.2时，您仍然可以使用 getMap（）。
要使用 getMapAsync() ，请在活动或片段上实现 OnMapReadyCallback 接口：
对于片段：
public class MapFragment extends android.support.v4.app.Fragment
implements OnMapReadyCallback { /* ... */ }
然后，在初始化映射时，使用 getMapAsync() 而不是 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 中的片段：
<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"/>
试试这个
GoogleMap map = ((SupportMapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
并在您的 XML 中
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
试试这个它对我有用如何使用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();
试试这个 我根据您的需要将其作为示例
public class LocationMapActivity extends FragmentActivity {
private GoogleMap mMap;
static boolean Iscamera = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.locatio_map);
setUpMapIfNeeded();
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
mMap.setMyLocationEnabled(true);
if (mMap != null) {
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setCompassEnabled(true);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.getMaxZoomLevel();
mMap.getMinZoomLevel();
mMap.getUiSettings();
mMap.animateCamera(CameraUpdateFactory.zoomIn());
mMap.animateCamera(CameraUpdateFactory.zoomOut());
mMap.animateCamera(CameraUpdateFactory.zoomTo(20));
mMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
@Override
public void onMyLocationChange(Location arg0) {
// TODO Auto-generated method stub
mMap.clear();
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(arg0.getLatitude(), arg0
.getLongitude()))
.title("I am Here!!")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.map_icon)));
if (!Iscamera) {
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(arg0.getLatitude(), arg0
.getLongitude()), 14));
Iscamera = true;
}
try {
if (Constant.FORTNAME.equals("Arad Fort")) {
mMap.addMarker(new MarkerOptions()
.position(new LatLng(26.2525, 50.6269))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
} else if (Constant.FORTNAME.equals("Bahrain Fort")) {
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(26.2333598,
50.52035139))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
} else if (Constant.FORTNAME
.equals("International Circuit")) {
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(26.0303251,
50.51121409))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
} else if (Constant.FORTNAME
.equals("Khamis Mousque")) {
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(26.158719, 50.516426))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
} else if (Constant.FORTNAME
.equals("king fahad causeway")) {
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(26.1723987,
50.4579942))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
} else if (Constant.FORTNAME.equals("Riffa Fort")) {
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(26.11771965026855,
50.56298065185547))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
} else if (Constant.FORTNAME
.equals("Royal Golf Club")) {
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(26.13000, 50.55500))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
} else if (Constant.FORTNAME.equals("Tree of life")) {
mMap.addMarker(new MarkerOptions()
.position(
new LatLng(25.9940396,
50.583135500000026))
.title(Constant.FORTNAME)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.greenicon)));
}
} catch (Exception e) {
Toast.makeText(getApplicationContext(),
e.getMessage(), Toast.LENGTH_LONG).show();
Log.e(e.getClass().getName(), e.getMessage(), e);
}
}
});
}
}
}
// ********************************************************************************************
@SuppressWarnings("unused")
private void setUpMap() {
mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title(
"Marker"));
}
}
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;
}
您可以使用它来制作地图，但它将返回地图对象为空，因为您找不到使用 getMapAsync 创建新对象 mMap 的解决方案。它只有返回 null
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:id="@+id/location_map"
android:layout_above="@id/atmLocation_recyclerView"
/>
View root= inflater.inflate(R.layout.fragment_a_t_m_locations, container, false);
SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.location_map);
mapFragment.getMapAsync(googleMap -> {
mMap=googleMap;
if(mMap!=null){
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
}
});
您的java文件（仅相关代码）-
View view = null, mapView = null;
private GoogleMap mMap;
view = inflater.inflate(R.layout.findmycar, container,false);
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
SupportMapFragment supportMapFragment = (SupportMapFragment) fragmentManager
.findFragmentById(R.id.map);
mMap = supportMapFragment.getMap();
mapView = (View) view.findViewById(R.id.map);