Question

我在活动中有两个片段。基于categoryFragment.java中选择的类别，子类别将显示在另一个片段中（SubcategoryFragment.java）

截至目前，当在categoryfragment中单击textview时，我正在显示子类别。而不是被替换，文本视图附加在点击上。

我甚至尝试过复制片段。但是无法两次提交片段事务。请告诉我哪里出错了。

MainActivity

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        itemsList.add(new Items(1,"Drinks","Coca Cola",10,1,"image.jpg"));
        itemsList.add(new Items(2,"Drinks","Pepsi",30,1,"image.jpg"));
        itemsList.add(new Items(3,"Food","Briyani",30,1,"image.jpg"));
        itemsList.add(new Items(4,"Food","meals",30,1,"image.jpg"));

        bundle.putParcelableArrayList("itemsList",  itemsList);
        bundle.putString("category","none");
        frg.setArguments(bundle);
       frg1.setArguments(bundle);
        transaction.add(R.id.My_Container_1_ID, frg, "Frag_Top_tag");
       transaction.add(R.id.My_Container_2_ID, frg1, "Frag_Middle_tag");
        transaction.commit();
    }

    @Override
    public void onFragmentInteraction(Integer id) {
        String category = "";
        itemsList.add(new Items(1,"Drinks","Coca Cola",10,1,"image.jpg"));
        itemsList.add(new Items(2,"Drinks","Pepsi",30,1,"image.jpg"));
        itemsList.add(new Items(3,"Food","Briyani",30,1,"image.jpg"));
        itemsList.add(new Items(4,"Food","meals",30,1,"image.jpg"));
        for(int i=0; i<itemsList.size();i++)
        {
            if( i == itemsList.get(id).getItemId() - 1)
               category = itemsList.get(i).getCategory();
        }

        ((SubCategoryFragment)getSupportFragmentManager().findFragmentById(R.id.My_Container_2_ID)).getSelectedCategory(category);

    }

CategoryFragmnet.java

@Override
 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View view;
        view = inflater.inflate(R.layout.fragment_category, container, false);

        Bundle bundle = this.getArguments();
        ArrayList<Items> myValue;
        myValue = bundle.getParcelableArrayList("itemsList");

        TextView textView = (TextView) view.findViewById(hello);
        textView.setOnClickListener(this);

        String cat="";
        for(int i=0; i<myValue.size();i++)
        {
            cat = cat + myValue.get(i).getCategory() +" ";
        }
        textView.setText(cat);
        return view;
    }
    OnFragmentInteractionListener dataPasser;
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }

        dataPasser = (OnFragmentInteractionListener) context;
    }

    @Override
    public void onClick(View v) {
        switch (v.getId())
        {
            case R.id.hello:
                mListener.onFragmentInteraction(1);
                break;
        }
    }

      public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Integer id);
    }

SubCategoryFragment.java

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view;
        view = inflater.inflate(R.layout.fragment_sub_category, container, false);
        return view;
    }

    public void onViewCreated(View v, Bundle savedInstanceState) {
        super.onViewCreated(v, savedInstanceState);
        Bundle bundle = this.getArguments();
        myValue = bundle.getParcelableArrayList("itemsList");
        String category = bundle.getString("category");
        textView = (TextView) v.findViewById(R.id.subh);
    }

    @Override
    public void onResume(){
        super.onResume();
    }
    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.OnSubFragmentInteractionListener(uri);
        }
    }

    OnSubFragmentInteractionListener dataPasser;
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnSubFragmentInteractionListener) {
            mListener = (OnSubFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }

        dataPasser = (OnSubFragmentInteractionListener) context;
    }

    public interface OnSubFragmentInteractionListener {
        void OnSubFragmentInteractionListener(Uri uri);
    }

    public void getSelectedCategory(String str)
    {
        textView = (TextView) getView().findViewById(R.id.subh);
        textView.setText(" ");
       String cat="";
        for(int i=0; i<myValue.size();i++)
        {
            if(str.equals(myValue.get(i).getCategory()))
                cat = cat + myValue.get(i).getSubCategory() +" ";
        }
        textView.setText(cat);
    }

Answer 1

Mayb您可以尝试使用接口在片段之间传递数据在第一个片段中创建一个接口MainActivity实现该接口和相应的方法，然后调用第二个fragent中定义的方法第二个片段通过该方法接收数据。由于2个片段不能直接进行，所以必须使用这种简单的方法希望这有帮助。

onClick在一个片段中，通过相同的主机活动更改另一个片段中的textview

1 个答案: