Android - 長按 RecyclerView 項目和 ContextMenu

Question

問題：在回收視圖中長按某個項目時，無法顯示顯示“刪除”選項的上下文菜單

預期結果：見下圖

我快到了，但是我缺少一些東西來使 contextMenu 顯示在 longClick 上。

這是我放在 viewHolder 中的內容。 我不知道我應該添加什么以及在 onLongClick 事件中顯示上下文菜單的位置。

我跳過了一些代碼行並保留了與我的問題相關的代碼行。

非常感謝您的幫助，

我的界面來處理這兩種類型的點擊

public interface OnItemClickListener{
    void onItemClick(int position);
}

public interface OnItemLongClickListener{
    void onItemLongClick(int position);
}

觀看者代碼

public void bindLongClick(final int position, final OnItemLongClickListener onItemLongClickListener) {
        itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                onItemLongClickListener.onItemLongClick(position);
                return true;
            }
        });
    }

    @Override
    public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenu.ContextMenuInfo contextMenuInfo){
            //menuInfo is null
        Log.v(LOG_TAG, "grrr");
        contextMenu.setHeaderTitle("Select The Action");
        contextMenu.add(0, view.getId(), 0, "Supprimer");//groupId, itemId, order, title
    }

適配器代碼

@Override
    public void onBindViewHolder(CityListViewholder holder, int position) {
        holder.cityName.setText(cityArrayList.get(position).getCityName());
        holder.bindClick(position, onItemClickListener);
        holder.bindLongClick(position, onItemLongClickListener);
    }

然后，在活動中 - 我跳過了與我的問題無關的內容

mCityListAdapter = new CityListAdapter(mContext, cityArrayList, new CityListAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(int position) {
                mPager.setCurrentItem(position);
                mDrawerLayout.closeDrawers();
            }
        }, new CityListAdapter.OnItemLongClickListener() {
            @Override
            public void onItemLongClick(int position) {
                Log.v(LOG_TAG, "Position "+position);
            }
        });

        registerForContextMenu(mRecyclerView);

Answer 1

你需要的是顯示里面有列表的對話框。 像這樣：

    itemView.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View view) {
            final CharSequence[] items = {"Supprimer", "etc", "etc1"};

            AlertDialog.Builder builder = new AlertDialog.Builder(mContext);

            builder.setTitle("Select The Action");
            builder.setItems(items, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int item) {
                }
            });
            builder.show();
            return true;
        }
    });

Answer 2

編輯 1：要專門顯示對話框，請使用

 openContextMenu(v);

其中 v 指的是視圖。 和

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
                                ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.context_menu,menu);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
  int id = item.getItemId();
        default:
            return super.onContextItemSelected(item);
    }
}

Menu 文件夾中的context_menu文件中的代碼應如下所示：

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.example.MainActivity">

    <item
        android:id="@+id/item"
        android:orderInCategory="200"
        android:title="Item"
        android:icon="@drawable/faq"
        app:showAsAction="ifRoom"
        ></item>
</menu>

在過去，我太有一些問題RecyclerView的onClickListener和onLongClickListener 。 所以這是我正在使用的一個：

public class ItemClickSupport {
    private final RecyclerView mRecyclerView;
    private OnItemClickListener mOnItemClickListener;
    private OnItemLongClickListener mOnItemLongClickListener;
    private View.OnClickListener mOnClickListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (mOnItemClickListener != null) {
                RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
                mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v);
            }
        }
    };
    private View.OnLongClickListener mOnLongClickListener = new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            if (mOnItemLongClickListener != null) {
                RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
                return mOnItemLongClickListener.onItemLongClicked(mRecyclerView, holder.getAdapterPosition(), v);
            }
            return false;
        }
    };
    private RecyclerView.OnChildAttachStateChangeListener mAttachListener
            = new RecyclerView.OnChildAttachStateChangeListener() {
        @Override
        public void onChildViewAttachedToWindow(View view) {
            if (mOnItemClickListener != null) {
                view.setOnClickListener(mOnClickListener);
            }
            if (mOnItemLongClickListener != null) {
                view.setOnLongClickListener(mOnLongClickListener);
            }
        }

        @Override
        public void onChildViewDetachedFromWindow(View view) {

        }
    };

    private ItemClickSupport(RecyclerView recyclerView) {
        mRecyclerView = recyclerView;
        mRecyclerView.setTag(R.id.item_click_support, this);
        mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
    }

    public static ItemClickSupport addTo(RecyclerView view) {
        ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
        if (support == null) {
            support = new ItemClickSupport(view);
        }
        return support;
    }

    public static ItemClickSupport removeFrom(RecyclerView view) {
        ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
        if (support != null) {
            support.detach(view);
        }
        return support;
    }

    public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) {
        mOnItemClickListener = listener;
        return this;
    }

    public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) {
        mOnItemLongClickListener = listener;
        return this;
    }

    private void detach(RecyclerView view) {
        view.removeOnChildAttachStateChangeListener(mAttachListener);
        view.setTag(R.id.item_click_support, null);
    }

    public interface OnItemClickListener {

        void onItemClicked(RecyclerView recyclerView, int position, View v);
    }

    public interface OnItemLongClickListener {

        boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
    }
}

然后在活動中，使用以下內容：

ItemClickSupport.addTo(recyclerView).setOnItemLongClickListener(new ItemClickSupport.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClicked(RecyclerView recyclerView, int position, View v) {

                return true;
            }
    });

使用position來指定項目。 希望有幫助！

Answer 3

接受的答案在技術上不是“答案”，而是一種巧妙的解決方法，因為它創建了AlertDialog而不是 OP 要求的ContextMenu ，它確實“解決了需求”，但沒有創建ContextMenu 。

這是我發現的最短實現：

在 Activity 中，照常覆蓋：

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
    menu.add("do this");
    menu.add("do that");
}

@Override
public boolean onContextItemSelected(MenuItem item) {
    if (item.getTitle().equals("do this") {
        // do whatever this...
    }
    else if (item.getTitle().equals("do that") {
        // do whatever that...
    }
    return super.onContextItemSelected(item);
}

在 RecyclerView 的項目 ViewHolder 中：

private class ItemViewHolder extends RecyclerView.ViewHolder {
    ...
    private ItemViewHolder(@NonNull View pItemView) {
        super(pItemView);
        pItemView.setLongClickable(true); // <-- make long clickable
        ...
    }
}

在 onCreate 活動中：

registerForContextMenu(myRecyclerView);