Question

在我的应用中，我使用底部导航视图。在第三个片段中必须是map。而且我不知道该如何发送数据。

ActivityBotom.class

中的方法

     @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        Fragment fragment = null;
        switch (item.getItemId()) {
            case R.id.nav_home:
                fragment = new FragmentMarker();
                break;
            case R.id.nav_bookmark:
                fragment = new FragmentBookmark();
                break;
            case R.id.nav_blog:
                fragment = new FragmentMap();
                break;
        }
        getSupportFragmentManager().beginTransaction().replace(R.id.frame_container, fragment).commit();
        return true;

    }

这是我的 FragmentMap.class

public class FragmentMap extends Fragment  {

      @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_map, container, false);
        mMapView = getArguments().getParcelable(EXTRA_MARKER_LIST);
        mMapView =  rootView.findViewById(R.id.mapView);
        mMapView.onCreate(savedInstanceState);
        mMapView.onResume(); 
        try {
            MapsInitializer.initialize(getActivity().getApplicationContext());
        } catch (Exception e) {
            e.printStackTrace();
        }

        mMapView.getMapAsync(new OnMapReadyCallback() {
            @RequiresApi(api = Build.VERSION_CODES.M)
            @Override
            public void onMapReady(GoogleMap mMap) {
                googleMap = mMap;
              ...
              Log.d("debug", "problem"); 
                }

                List<Marker> markerList = getActivity().getIntent().getParcelableArrayListExtra(EXTRA_MARKER_LIST);
                for (int i = 0; i < markerList.size(); i++) {
                    Marker marker = markerList.get(i);
                    Location location = marker.getLocation();
                    clusterManager.setItems(markerList);
                }
            }

        });

而且我不断收到此错误 java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Parcelable android.os.Bundle.getParcelable(java.lang.String)' on a null object reference

我认为万一map myst是Bundle。但是我不知道如何实现它。我希望有人能帮助我。谢谢

Answer 1

您可以使用参数发送数据

Bundle bundle = new Bundle();
bundle.putSerializable(EXTRA_MARKER_LIST, ________);
fragment = new FragmentMap();
fragment.setArguments(bundle);

这将解决问题

在底部导航抽屉中加载带有标记列表的地图片段

1 个答案: