FragmentTransaction.replace 不工作

Question

我试图通过单击 recyclerview 中的 ImageView 打开一个新片段...但没有输出

recyclerview 屏幕保持原样，我想显示的片段没有显示

这是我的适配器 class，其中包含 fragmentTransaction

 public class RecyclerViewDataAdapter extends RecyclerView.Adapter<RecyclerViewDataAdapter.ViewHolder> {
    private Context context;
    public ImageLoader mImageLoader;

    //List of superHeroes
    List<ListOfData> superHeroes;

    public RecyclerViewDataAdapter(List<ListOfData> superHeroes, Context context) {
        super();
        //Getting all the superheroes
        this.superHeroes = superHeroes;
        this.context = context;

    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.recyclerview_row, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }


    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        ListOfData superHero = superHeroes.get(position);


        mImageLoader = MyApplication.getInstance().getImageLoader();
        mImageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView1, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
        holder.imageView1.setImageUrl(superHero.getImageUrl(), mImageLoader);
        holder.textViewName1.setText(superHero.getName());
        //holder.textViewName2.setText(superHero.getName());
        //holder.textViewRank.setText(String.valueOf(superHero.getRank()));
        //holder.textViewRealName.setText(superHero.getRealName());
        //holder.textViewCreatedBy.setText(superHero.getCreatedBy());
        //holder.textViewFirstAppearance.setText(superHero.getFirstAppearance());

        //String powers = "";

       /* for(int i = 0; i<superHero.getPowers().size(); i++){
            powers+= superHero.getPowers().get(i);
        }*/

        //holder.textViewPowers.setText(powers);


        holder.imageView1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                BehindTheLayoutFragment fragment = new BehindTheLayoutFragment();
                FragmentTransaction ft = ((AppCompatActivity)context).getFragmentManager().beginTransaction();
               ft.replace(R.id.behind_the_layout_fragment, fragment);
                ft.addToBackStack(null);
                ft.commit();
                //((AppCompatActivity)context).getFragmentManager().beginTransaction().replace(R.id.behind_the_layout_fragment, fragment).commit();

            }
        });

    }

    @Override
    public int getItemCount() {
        return superHeroes.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder {
        public NetworkImageView imageView1;
        public TextView textViewName1;
        public TextView textViewName2;
        public TextView textViewRank;
        public TextView textViewRealName;
        public TextView textViewCreatedBy;
        public TextView textViewFirstAppearance;
        public TextView textViewPowers;

        public ViewHolder(View itemView) {
            super(itemView);
            imageView1 = (NetworkImageView) itemView.findViewById(R.id.thumbnail);
            textViewName1 = (TextView) itemView.findViewById(R.id.category_title_one);
            /* textViewRank= (TextView) itemView.findViewById(R.id.textViewRank);
            textViewRealName= (TextView) itemView.findViewById(R.id.textViewRealName);
            textViewCreatedBy= (TextView) itemView.findViewById(R.id.textViewCreatedBy);
            textViewFirstAppearance= (TextView) itemView.findViewById(R.id.textViewFirstAppearance);
            textViewPowers= (TextView) itemView.findViewById(R.id.textViewPowers);
            */
        }

    }
}

以及我想通过 onclicklistner 打开的片段

  public class BehindTheLayoutFragment extends android.app.Fragment {
    private ImageLoader mImageLoader ;
    private String imgUrl = "https://upload.wikimedia.org/wikipedia/commons/2/24/Blue_Tshirt.jpg";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.behind_the_layout_fragment, container, false);

        mImageLoader = MyApplication.getInstance().getImageLoader();

        NetworkImageView imageView = (NetworkImageView)view.findViewById(R.id.thumbnail);
        imageView.setImageUrl(imgUrl, mImageLoader);

        return view;
    }
}

这是显示为弹出窗口的布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
>

<com.android.volley.toolbox.NetworkImageView
    android:id="@+id/thumbnail"
    android:layout_width="250dp"
    android:layout_height="300dp"
    android:layout_marginLeft="12dp"
    android:layout_marginRight="12dp"
    android:layout_marginTop="20dp"
    android:layout_centerHorizontal="true"
    android:scaleType="fitXY">

</com.android.volley.toolbox.NetworkImageView>

Answer 1

这样做

在您的适配器中，您应该像这样传递一个片段实例。将构造函数更改为

RecyclerViewDataAdapter(List<ListOfData> superHeroes, Context context, Fragment fragment){
    fragmentInstance = fragment; // Declare Fragment fragmentInstance in adapter
    ....
}

并在您的片段中执行此操作

RecyclerViewDataAdapter(superHeroes, getActivity(), FragmentName.this)

现在在事务中调用这个

FragmentTransaction ft = fragmentInstance.getChildFragmentManager().beginTransaction();

同时将 LinearLayout 更改为 FrameLayout。

另请注意，FragmentName 是您从中调用适配器的片段的名称。

这应该行得通！！

FragmentTransaction.replace 不工作

FragmentTransaction.replace not working

android

fragmenttransaction