单击后隐藏/显示 ListView 项目中的元素

Question

我有一个Fragment，其中包含一个ListView。 ListView 项目包含 TextView 和 Button 元素。当我在列表视图中按下按钮时，我想更新单击按钮以隐藏按钮并显示TextView 的行（TextView 内的文本也需要每秒更新一次）。

这可能吗？如何实现？

MyFragment

public class MyFragment extends Fragment implements ClickedListener {
    private static final String TAG = MyFragment.class.getSimpleName();

    private MyListAdapter myListAdapter;

    public MyFragment() {
        // Required empty public constructor
        Log.e(TAG, "MyFragmment");
    }

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

        ListView myListView = view.findViewById(R.id.listView);

        myListAdapter = new MyListAdapter(getActivity(), MyFragment.this);
        myListView.setAdapter(myListAdapter);

        getList();

        return view;
    }

    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser && isResumed()) {
            getList();
        }
    }

    private void getList() { //This part works no need to discuss this.
        List<Items> items = myItemsContent.getItems();
                    myListAdapter.setItems(items);
    }

    @Override
    public void buttonClicked(Item item) {
        doSomeStuff();
        myListAdapter.displayTextView();
    }
}

MyListAdapter

public class MyListAdapter extends ArrayAdapter<Item> {
    private static final String TAG = MyListAdapter.class.getSimpleName();

    private Button myButton;
    private TextView status;

    private final Context context;

    public interface ClickedListener {
        void buttonClicked(Item item);
    }

    private final ClickedListener clickedListener;

    public MyListAdapter(@NonNull Context context, ClickedListener clickedListener) {
        super(context, R.layout.list_item);

        this.context = context;
        this.clickedListener = clickedListener;
    }

    public void setItems(List<Items> items) {
        super.addAll(items);
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        View row = convertView;

        if (row == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            row = inflater.inflate(R.layout.list_item, parent, false);
        }

        TextView itemName = row.findViewById(R.id.list_item_name);
        myButton = row.findViewById(R.id.myButton);
        status = row.findViewById(R.id.status);

        Item item = getItem(position);
        if (item != null) {
            itemName.setText(item.getName());

            myButton.setOnClickListener(v -> clickedListener.buttonClicked(item));
        }

        return row;
    }

    public void displayTextView() {
        myButton.setVisibility(View.INVISIBLE);
        status.setVisibility(View.VISIBLE);
    }
}

Answer 1

我会以更可靠的方式来做。我想你知道 Listview 和适配器的工作原理。

因此，您有要传递给适配器的项目列表。我将通过以下方式更改我的 Item 类。请在我认为是模型的 Item 类中添加这两个字段

public boolean isButtonVisible = true;
public boolean isTextViewVisible = false;

去头创建header和setter。或者更改任何默认值

现在在 Adapter 的 getView 方法中最后这样做 //或者只是复制替换

    @NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
    View row = convertView;

    if (row == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row = inflater.inflate(R.layout.list_item, parent, false);
    }

    TextView itemName = row.findViewById(R.id.list_item_name);
    myButton = row.findViewById(R.id.myButton);
    status = row.findViewById(R.id.status);

    Item item = getItem(position);
    if (item != null) {
        itemName.setText(item.getName());

        myButton.setOnClickListener(v -> clickedListener.buttonClicked(item));

       if(item.isButtonVisible){
        myButton.setVisiblity(View.VISIBLE);
       }else{
       myButton.setVisibilty(View.GONE)        
       }

       if(item.isTextViewVisible){
        myTextView.setVisiblity(View.VISIBLE);
       }else{
       myTextView.setVisibilty(View.GONE)        
       }

    }

    return row;
    }

最后在下面的方法中的片段中执行此操作

 @Override
   public void buttonClicked(Item item) {
    doSomeStuff();
    item.setButtonVisibility (Whatever you want to do true or false)
    ite.setTextViewVisible  (Whatever you want to do true or false)
    myListAdapter.notifyDataSetChanged(); 
    }

重要提示：您需要调用 myListAdapter.notifyDataSetChanged() 结束。你不需要调用 myListAdapter.displayTextView();作为 这行不通

Answer 2

您可以在片段中获取按钮单击事件，然后将布尔变量设置为模型并根据适配器中的显示/隐藏文本视图。