Android - 如何在標籤動作中顯示mapFragment

Question

我有選項卡活動，並在第一個標籤中我想顯示地圖片段。 我的問題是，我不知道該怎麼做。 我有地圖片段，它擴展了supportMapFragment，但我仍然不知道如何在選項卡中顯示該片段。

這是主要的活動標籤

public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     // getItem is called to instantiate the fragment for the given page. 
     // Return a PlaceholderFragment (defined as a static inner class below). 
     switch (position) { 
      case 0: 
       // here i want to show the mapFragment. how should i do that? 
       return new Maps(); 
      case 1: 
       return new GroupsFragment(); 
      default: 
       return new Fragment(); 
     } 
    } 

編輯 MapActivity

public class MapsActivity extends SupportMapFragment implements OnMapReadyCallback { 

private static final int RC_LOCATION = 1; 
private GoogleMap mMap; 

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



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

    addMyLocation(); 

} 

private boolean checkLocationPermission(){ 
    String[] permissions = new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}; 
    //If No Permission-> Request the permission and return false. 
    if (ActivityCompat.checkSelfPermission(getContext(), 
      android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 

     ActivityCompat.requestPermissions(getActivity(), permissions, RC_LOCATION); 
     return false; 
    } 
    return true;//return true if we have a permission 
} 

private void addMyLocation(){ 
    if (!checkLocationPermission())return; 
    mMap.setMyLocationEnabled(true); 
    mMap.setOnMyLocationButtonClickListener(new GoogleMap.OnMyLocationButtonClickListener() { 
     @Override 
     public boolean onMyLocationButtonClick() { 
      if (mMap.getMyLocation()!=null) { 
       Location myLocation = mMap.getMyLocation(); 
       Toast.makeText(getActivity(), "" + myLocation.getLatitude(), Toast.LENGTH_SHORT).show(); 
      } 
      return false; 
     } 
    }); 
} 
@Override 
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { 
    super.onRequestPermissionsResult(requestCode, permissions, grantResults); 
    if (grantResults[0] == PackageManager.PERMISSION_GRANTED){ 
     //noinspection MissingPermission 
     addMyLocation(); 
    } 
} 

}

Answer 1

試試這個

public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     // getItem is called to instantiate the fragment for the given page. 
     // Return a PlaceholderFragment (defined as a static inner class below). 
     switch (position) { 
      case 0: 
       SupportMapFragment mapFragment = SupportMapFragment.newInstance(); 
       mapFragment.getMapAsync(new OnMapReadyCallback() { 
        @Override 
        public void onMapReady(GoogleMap googleMap) { 

        } 
       }); 

       return mapFragment; 
      case 1: 
       return new GroupsFragment(); 
      default: 
       return new Fragment(); 
     } 
    } 

    @Override 
    public int getCount() { 
     return 3; 
    } 
}