Question

我想在recyclerview的cardview项目上有一个上下文菜单。

How to create context menu for RecyclerView并没有真正为此提供解决方案。

我可以在ViewHolder上创建OnClickListener和OnLongClickListener。我也可以输入OnCreateContextMenu，但是永远不会调用onCreateContextMenu。

任何人都可以提供一个例子吗？

Answer 1

如果您未设置长按监听器，菜单将在长按事件中打开，并显示：

public static class MyViewHolder extends RecyclerView.ViewHolder
      implements View.OnCreateContextMenuListener, View.OnClickListener,
      MenuItem.OnMenuItemClickListener {

    MyViewHolder(View itemView) {
      super(itemView);
      itemView.setOnClickListener(this);
      itemView.setOnCreateContextMenuListener(this);
    }


    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
        ContextMenu.ContextMenuInfo menuInfo) {
        MenuItem myActionItem = menu.add("Some menu item");
        myActionItem.setOnMenuItemClickListener(this);
    }

    @Override
    public boolean onMenuItemClick(MenuItem item) {
      // Menu Item Clicked!
      return true;
    }
}

Answer 2

你好，伙计们，你不能像 onClickListener 那样直接实现这些方法， OnContextMenuListener 等，因为 RecycleView 扩展 android.view.ViewGroup 所以我们不能直接使用这些方法。我们可以在 ViewHolder 适配器类中实现这些方法。我们可以像这样使用RecycleView中的上下文菜单

public static class ViewHolder extends RecyclerView.ViewHolder implements OnCreateContextMenuListener {
TextView tvTitle;
ImageView ivImage;
    public ViewHolder(View v) {
        super(v);
        tvTitle =(TextView)v.findViewById(R.id.item_title);
        v.setOnCreateContextMenuListener(this);


    }

现在我们在实现上下文菜单时遵循相同的过程。

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

        menu.setHeaderTitle("Select The Action");    
        menu.add(0, v.getId(), 0, "Call");//groupId, itemId, order, title   
        menu.add(0, v.getId(), 0, "SMS"); 

    }

如果您遇到任何困难，请在评论中提问。

Answer 3

我可能迟到了派对，但我有一个有效的解决方案。我已经为它做了一个要点。

将上下文菜单添加到RecyclerView

<强> ActivityName.java

//Import Statements

public class ActivityName extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_view_birthdays);


        //Recycle View
        mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
        mLayoutManager = new LinearLayoutManager(getApplicationContext());
        mRecyclerView.setLayoutManager(mLayoutManager);
        mAdapter = new BirthdaysListAdapter(data, this);
        mRecyclerView.setAdapter(mAdapter);


    }

<强> RecyclerAdapter.java

//Import Statements


public class BirthdaysListAdapter extends RecyclerView.Adapter<BirthdaysListAdapter.ViewHolder> {
    static Context ctx;

    private List<typeOfData> Data;


    public BirthdaysListAdapter(List<typeOfData> list, Context context) {
        Data = list;
        this.ctx = context;

    }

    BirthdaysListAdapter() {
    }

    public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnCreateContextMenuListener {
        public TextView name;
        public TextView Birthday;
        public ImageView colorAlphabet;
        public TextView textInImg;


        public ViewHolder(View v) {
            super(v);
            name = (TextView) v.findViewById(R.id.name);
            Birthday = (TextView) v.findViewById(R.id.Birthday);
            colorAlphabet = (ImageView) v.findViewById(R.id.colorAlphabet);
            textInImg = (TextView) v.findViewById(R.id.textInImg);


            v.setOnCreateContextMenuListener(this); //REGISTER ONCREATE MENU LISTENER
        }

        @Override
        public void onCreateContextMenu(ContextMenu menu, View v                         //CREATE MENU BY THIS METHOD
                                        ContextMenu.ContextMenuInfo menuInfo) {
            new BirthdaysListAdapter().info = (AdapterView.AdapterContextMenuInfo) menuInfo;
            MenuItem Edit = menu.add(Menu.NONE, 1, 1, "Edit");
            MenuItem Delete = menu.add(Menu.NONE, 2, 2, "Delete");
            Edit.setOnMenuItemClickListener(onEditMenu);
            Delete.setOnMenuItemClickListener(onEditMenu);


        }
//ADD AN ONMENUITEM LISTENER TO EXECUTE COMMANDS ONCLICK OF CONTEXT MENU TASK
        private final MenuItem.OnMenuItemClickListener onEditMenu = new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {


                DBHandler dbHandler = new DBHandler(ctx);
                List<WishMen> data = dbHandler.getWishmen();

                switch (item.getItemId()) {
                    case 1:
                        //Do stuff
                        break;

                    case 2:
                       //Do stuff

                        break;
                }
                return true;
            }
        };


    }


    public List<ViewBirthdayModel> getData() {
        return Data;
    }


    @Override
    public long getItemId(int position) {

        return super.getItemId(position);
    }


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

    @Override
    public void onBindViewHolder(final ViewHolder holder, int position) {
        holder.name.setText(Data.get(position).getMan().getName());
        holder.Birthday.setText(Data.get(position).getMan().getBday());
        holder.colorAlphabet.setBackgroundColor(Color.parseColor(Data.get(position).getColor()));
        holder.textInImg.setText(String.valueOf(Data.get(position).getMan().getName().toUpperCase().charAt(0)));
           }


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

    private int position;

    public int getPosition() {

        return position;
    }

    public void setPosition(int position) {
        this.position = position;
    }

}

Answer 4

如果您想避免以编程方式手动编程定义适配器内的上下文菜单，那么您可以使用PopupMenu代替并从适当的menu.xml中对其进行充气

下面的示例正是如此，并允许您传入一个侦听器，该侦听器将在您的Activity或Fragment中首先接收选择和菜单项，然后首先设置此RecyclerView。

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

private List<CustomObject> objects;
private OnItemSelectedListener listener;
private final boolean withContextMenu;

class ViewHolder extends RecyclerView.ViewHolder
        implements View.OnClickListener, View.OnCreateContextMenuListener, PopupMenu.OnMenuItemClickListener {

    @BindView(R.id.custom_name)
    TextView name;

    @BindView(R.id.custom_value)
    TextView value;

    ViewHolder(View view) {
        super(view);
        ButterKnife.bind(this, view);
        view.setOnClickListener(this);
        if (withContextMenu) {
            view.setOnCreateContextMenuListener(this);
        }
    }

    @Override
    public void onClick(View v) {
        int position = getAdapterPosition();
        if (listener != null) {
            listener.onCustomerSelected(objects.get(position));
        }
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        PopupMenu popup = new PopupMenu(v.getContext(), v);
        popup.getMenuInflater().inflate(R.menu.custom_menu, popup.getMenu());
        popup.setOnMenuItemClickListener(this);
        popup.show();
    }

    @Override
    public boolean onMenuItemClick(MenuItem item) {
        if (listener != null) {
            CustomObject object = objects.get(getAdapterPosition());
            listener.onCustomerMenuAction(object, item);
        }
        return false;
    }
}

public CustomerAdapter(List<CustomObject> objects, OnItemSelectedListener listener, boolean withContextMenu) {
    this.listener = listener;
    this.objects = objects;
    this.withContextMenu = withContextMenu;
}

public interface OnItemSelectedListener {

    void onSelected(CustomObject object);

    void onMenuAction(CustomObject object, MenuItem item);
}

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

@Override
public void onBindViewHolder(CustomAdapter.ViewHolder holder, int position) {
    CustomObject object = objects.get(position);
    holder.name.setText(object.getName());
    holder.value.setText(object.getValue());
}

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

这里有完整的要点 https://gist.github.com/brettwold/45039b7f02ce752ae0d32522a8e2ad9c

ContextMenu中包含RecyclerView和Cardview

4 个答案: