Question

我已经研究了一个星期，但仍然一无所获。当我准备用于MainActivity的相同示例时，RecyclerView放在Fragment上时根本不会加载任何内容。已经做了很多研究，没有找到答案。最糟糕的部分是，一个示例正在运行并且遵循相同的协议（以某种方式表示），而其他示例则无法运行。

应该存在的所有XML文件都可以...那么，这不是问题...任何线索吗？

ExpandableListView存在一个非常相似的问题（它可用于常规活动，并且在处于片段状态时无法加载数据）

我放置这段代码是因为它应该是最简单的一个...

public class RecyclerFragment extends Fragment {

RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
RecyclerAdapterDroids adapter;

public RecyclerFragment() {
    // Required empty public constructor
}


@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.fragment_recycler, container, false);

    recyclerView = (RecyclerView) view.findViewById(R.id.reciclerview_in_fragment);
    layoutManager = new LinearLayoutManager(view.getContext());
    adapter = new RecyclerAdapterDroids();
            //RecyclerAdapterDroids(); Inner Class
    recyclerView.setAdapter(adapter);

    return view;
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState){

}





public class RecyclerAdapterDroids extends RecyclerView.Adapter<RecyclerAdapterDroids.ViewHolder>{

    private String[] droidNames = {"Beep boop beep","Twing Tweeng", "Bap Beep Bop", "Bep Beep Bite", "Boop Bing Beep"};
    private  String[] details = {"high_qualified", "stupid_friendly_lazy_bot","hard_work_doer", "strong_hyperactive","crappy_lazy_bot"};
    private  int[] images = {R.drawable.android_image_1, R.drawable.android_image_2, R.drawable.android_image_3, R.drawable.android_image_4, R.drawable.android_image_5};

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

    @Override
    public void onBindViewHolder(@NonNull ViewHolder viewHolder, int position) {
        viewHolder.itemName.setText(droidNames[position]);
        viewHolder.itemDetail.setText(details[position]);
        viewHolder.itemImage.setImageResource(images[position]);
    }

    @Override
    public int getItemCount() {
        return droidNames.length;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        public ImageView itemImage;
        public TextView itemName;
        public TextView itemDetail;

        public ViewHolder(View itemView) {
            super(itemView);

            itemImage = (ImageView) itemView.findViewById(R.id.item_image);
            itemName = (TextView) itemView.findViewById(R.id.item_title);
            itemDetail = (TextView) itemView.findViewById(R.id.item_detail);

        }
    }
}
}

Answer 1

您尚未将布局管理器设置为您的回收站视图，这就是为什么它不显示。

recyclerView.setLayoutManager(layoutManager)

这应该解决它。

适配器无法与片段上的Android窗口小部件一起正常使用（RecyclerView，ExpandableListView）

1 个答案: