Android 如何在 Fragment 中获取 Google Maps 对象
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How to get Google Maps object inside a Fragment
提问by Salman Khan
I am using fragments in my application and I am new for this. There is a fragment in which I want to display Google Map and want to get its object, for this I have a fragment in my XML and I want to inflate it in the Fragment itself. When I am trying to inflate the map view its showing me error for getSupportFragmentManager().
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它的对象，为此我在我的 XML 中有一个片段，我想在片段本身中对其进行膨胀。当我尝试给地图视图充气时，它会显示 getSupportFragmentManager() 错误。
How do I get the map object then that is the main issue. My XML is like this :-
我如何获得地图对象，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" />
And my Fragment in which I want to get the Google Map object is like that :-
我想在其中获取 Google Map 对象的 Fragment 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);
}
Can someone help me to get the object for my map so that I can show current location and draw the marker there.
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。
Any help would be appreciable. Thanks in advance.
任何帮助将是可观的。提前致谢。
回答by Mohd Mufiz
Try this
尝试这个
GoogleMap map = ((SupportMapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
and in your xml
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" />
回答by Dharmbir Singh
getMap() method is depricated
getMap() 方法被弃用
getMap()method is depreciated but after the play-services 9.2it is removed, so better use getMapAsync(). You can still use getMap() only if you are not willing to update the play-services 9.2for your app.
getMap()方法已折旧但在play-services 9.2删除后，因此最好使用 getMapAsync()。仅当您不愿意play-services 9.2为您的应用程序更新时，您仍然可以使用 getMap() 。
To use getMapAsync(), implement the OnMapReadyCallbackinterface on your activity or fragment:
要使用getMapAsync()，请OnMapReadyCallback在您的活动或片段上实现接口：
For fragment
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
}
For Activity
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
}
Fragment in xml
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"/>
回答by abozaid
Try this it works for me How to put Google Maps V2 on a Fragment Using ViewPager
试试这个对我 有用 How to put Google Maps V2 on a Fragment Using ViewPager
<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();
回答by Michel
Try this i have made this as a sample according to your need
试试这个我已经根据您的需要将其作为样本
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"));
}
}
回答by Lam M?nh Hùng
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;
}
You can use this to making map but it will return map object is null because you don't find solution with getMapAsync to create a new object mMap. It only background task with return null
您可以使用它来制作地图，但它会返回地图对象为空，因为您找不到使用 getMapAsync 的解决方案来创建新对象 mMap。它只返回 null 的后台任务
回答by My God
Revised code:
修改后的代码：
Your xml file-
您的 xml 文件-
<fragment
android:name="com.google.android.gms.maps.SupportMapFragment"
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
Your java file (only relevant code)-
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);
