即时通讯使用我的应用程序的底部导航，但每次我用我的 Map 按下片段的按钮，它崩溃 . 我不知道从哪里开始寻找解决方案，因为没有错误 . 我已经拥有我的清单上的所有权限，我的gradle已更新 . 它可能是我的xml，但我尝试了一些组合，仍然没有工作

这是我的fragment_map.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
    android:id="@+id/map"
    android:name="com.example.kristopher.isalon.MainMenu.MapFragment"
    android:layout_width="match_parent"
    android:layout_height="399dp" />
</LinearLayout>

这是我的MapFragment.java

public class MapFragment extends  Fragment implements OnMapReadyCallback {
GoogleMap mGoogleMap;
MapView mMapView;
View mView;
private static final int MY_REQUEST_INT = 177;


private static final String TAG = "MapFragment";

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    mView = inflater.inflate(R.layout.fragment_map, container, false);
    mMapView = (MapView) mView.findViewById(R.id.map);
    if (mMapView != null) {
        mMapView.onCreate(null);
        mMapView.onResume();
        mMapView.getMapAsync(this);
    }
    return mView;

}


@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);


}

@Override
public void onMapReady(GoogleMap googleMap) {
    mGoogleMap = googleMap;



    /* check location's permission.*/

    if (ContextCompat.checkSelfPermission(getActivity(),
            Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
            && ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION)
            != PackageManager.PERMISSION_GRANTED)  {
        // TODO: Consider calling
        //code for permission not granted.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION,
                    Manifest.permission.ACCESS_FINE_LOCATION}, MY_REQUEST_INT);
        }
        return;
    } else {


        //code for permission granted.
        mGoogleMap.setMyLocationEnabled(true);
        mGoogleMap.getUiSettings().setZoomControlsEnabled(true);

    }


}


}
android google-maps