将Firebase中的数据从一个片段传递到另一个片段

Question

我正在尝试将Firebase中的CategoryID从一个片段传递到另一个片段 使用ImageView单击，但单击ImageView时我的应用程序崩溃。

这是我的代码;

MenuFragment.java

FirebaseRecyclerAdapter<Category, MenuViewHolder> adapter;

viewHolder.setItemClickListener(new ItemClickListener() {
                @Override
                public void onClick(View view, int position, boolean isLongClick) {

                   CarListFragment cfragment= new CarListFragment ();
                    Bundle bundle = new Bundle();
                    bundle.putString("CategoryID",adapter.getRef(position).getKey());
                    cfragment.setArguments(bundle);

                    getFragmentManager().beginTransaction()
                            .replace(R.id.frame_main, cfragment, cfragment.getTag())
                            .addToBackStack(null)
                            .commit();
                }
            });

CarListFragment.java

String CategoryID="";

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v= inflater.inflate(R.layout.fragment_car_list, container, false);


    Bundle bundle = this.getArguments();
    if (bundle != null) {
        CategoryID=getActivity().getIntent().getStringExtra("CategoryID");
    }


    if(!CategoryID.isEmpty()&& CategoryID!=null){
        loadCarList(CategoryID);
    }


    return v;
}

logcat的

Answer 1

使用bundle因为它有数据

Bundle bundle = this.getArguments();
if (bundle != null) {
    CategoryID = bundle.getString("CategoryID");
    //           ^^^^^^
}

而不是

CategoryID=getActivity().getIntent().getStringExtra("CategoryID");

因为getActivity().getIntent()会为您提供之前用于开展活动的Intent对象

Answer 2

使用它：

    CarListFragment cfragment= new CarListFragment ();
                    Bundle bundle = new Bundle();
                    bundle.putString("CategoryID", adapter.getRef(position));
                    cfragment.setArguments(bundle);

                    getFragmentManager().beginTransaction()
                            .replace(R.id.frame_main, cfragment, cfragment.getTag())
                            .addToBackStack(null)
                            .commit();

获取字符串：

    String str = getArguments().getString("my_string");