处理项目长按回收站视图

Question

我有一个自定义recyclerView 的适配器，我想在recyclerView 的项目上的长按事件上打开一个弹出菜单。 我该怎么做？

Answer 1

这已经回答here。无论如何，你可以这样做：

class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
    private Article article;

    private TextView nameTextView;

    public ViewHolder(View itemView) {
        super(itemView);
        itemView.setOnClickListener(this);
        itemView.setOnLongClickListener(this);
        nameTextView = (TextView) itemView.findViewById(R.id.grid_item_article_name_textView);
    }

    public void bind(Article article) {
        this.article = article;
        nameTextView.setText(article.getName());
    }

    @Override
    public void onClick(View view) {
        // Context context = view.getContext();
        // article.getName()
    }

    @Override
    public boolean onLongClick(View view) {
        // Handle long click
        // Return true to indicate the click was handled
        return true;
    }
}

更新：如果您使用的是 Kotlin，请执行以下操作：

inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView), 
    View.OnClickListener, View.OnLongClickListener {

    init {
        itemView.setOnClickListener(this)
        itemView.setOnLongClickListener(this)
    }

    private lateinit var article: Article

    private val titleTextView: TextView = itemView.findViewById(R.id.item_article_title_textView)

    fun bind(article: Article) {
        this.article = article
        titleTextView.text = article.title
    }

    override fun onClick(view: View) {
        listener.onItemClick(article)
    }

    override fun onLongClick(view: View): Boolean {
        Toast.makeText(view.context, "long click", Toast.LENGTH_SHORT).show()
        // Return true to indicate the click was handled
        return true
    }
}

Answer 2

我是这样做的：

static class ViewHolder extends RecyclerView.ViewHolder {
    TextView tvName;

    ViewHolder(View v) {
        super(v);
        tvName = (TextView) v.findViewById(R.id.textView_Username);
        //Single Tapup
        v.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(v.getContext(), "Position is " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
            }
        });

        //Long Press
        v.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                Toast.makeText(v.getContext(), "Position is " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
                return false;
            }
        });
    }
}

Answer 3

首先，您必须注册 Activity 以监听来自 recyclerView 的 longClick 事件（因此您不必使用任何类型的 onLongClickListener...）：

registerForContextMenu(recyclerView);

然后你创建一个菜单资源（context_menu.xml）：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:title="Mostra documento" android:id="@+id/context_menu_documents_fragment_view"></item>
    <item android:title="Aggiungi ad un contenitore" android:id="@+id/context_menu_documents_fragment_add_to_box"></item>
    <item android:title="Elimina documento" android:id="@+id/context_menu_documents_fragment_delete"></item>
</menu>

在您为上下文菜单注册的活动中，您会覆盖此方法：

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        // Inflate Menu from xml resource
        MenuInflater menuInflater = getActivity().getMenuInflater();
        menuInflater.inflate(R.menu.context_menu_documents_fragment, menu);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {

        Toast.makeText(getActivity(), " User selected something ", Toast.LENGTH_LONG).show();


        return false;
    }

这很重要，你必须像这样修改RecyclerView适配器中的代码：

@Override
    public void onBindViewHolder(final DocumentViewHolder viewHolder, int position) {

        ...
        viewHolder.itemView.setLongClickable(true);
        ...
    }

现在您可以显示上下文菜单并拦截用户选择！ 但是您无法知道用户单击了哪个项目，为此您必须使用这样的自定义 RecyclerView（来自 Renaud Cerrato 的原始代码）：

public class ContextMenuRecyclerView extends RecyclerView {

    private RecyclerContextMenuInfo mContextMenuInfo;



    public ContextMenuRecyclerView(Context context) {
        super(context);
    }

    public ContextMenuRecyclerView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ContextMenuRecyclerView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected ContextMenu.ContextMenuInfo getContextMenuInfo() {
        return mContextMenuInfo;
    }

    @Override
    public boolean showContextMenuForChild(View originalView) {
        final int longPressPosition = getChildAdapterPosition(originalView);
        if (longPressPosition >= 0) {
            final long longPressId = getAdapter().getItemId(longPressPosition);
            mContextMenuInfo = new RecyclerContextMenuInfo(longPressPosition, longPressId);
            return super.showContextMenuForChild(originalView);
        }
        return false;
    }

    public static class RecyclerContextMenuInfo implements ContextMenu.ContextMenuInfo {

        public RecyclerContextMenuInfo(int position, long id) {
            this.position = position;
            this.id = id;
        }

        final public int position;
        final public long id;
    }

}

在前面的onContextItemSelected() 方法中，您可以使用以下代码知道recyclerView 项目的id 和位置：

ContextMenuRecyclerView.RecyclerContextMenuInfo info = (ContextMenuRecyclerView.RecyclerContextMenuInfo) item.getMenuInfo();

最后，您必须修改 recyclerView 适配器和布局文件中的 getItemId() 方法，以确保您使用的是您的 recyclerView 而不是 android 的！

Answer 4

我一直在努力获取点击时项目的位置，这对我有用：

public void onClick(View view) {
    ViewHolder holder =(ViewHolder)view.getTag();
    int position = holder.getLayoutPosition();
    Log.d("testing ","pos" +position);
}