Android - 如何在选项卡操作中显示 mapFragment

Question

我有选项卡活动，我想在第一个选项卡中显示地图片段。 我的问题是我不知道该怎么做。 我有扩展 supportMapFragment 的地图片段，但我仍然不知道如何在选项卡中显示该片段。

这是主要的活动标签

   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();
        }
    }

编辑 地图活动

  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

试试这个

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;
    }
}