Advanced Recycler View - 处理项目点击和长按拖动操作

Question

我正在使用 advanced recycler view 创建拖放网格视图。我的代码基于库作者提供的示例。一切似乎都工作得很好，拖放很好地保存了它的状态、交换位置等，但我无法附加到这个简单的项目点击监听器上。就像 RecyclerViewDragDropManager 包装的适配器只能执行那些拖放操作。在这种情况下，我很困惑点击监听器应该去哪里，因为通常在 RecyclerView 中你可以在 bindView 中附加到你的适配器，但我的适配器只有在长按后才会启动并且只处理拖放。

我尝试了堆栈中关于如何将点击侦听器附加到 RecyclerView 的所有解释，似乎没有任何效果。

我需要的是如果长按没有启动并知道它发生在哪个项目上，则拦截操作。

这是设置回收视图和适配器的片段代码：

private void setLayout() {
    mRecyclerView = (RecyclerView) mView.findViewById(R.id.recycler_view);
    mLayoutManager = new GridLayoutManager(mContext, Const.GRID_ROW_SIZE, GridLayoutManager.VERTICAL, false);

    //drag & drop manager
    mRecyclerViewDragDropManager = new RecyclerViewDragDropManager();
    mRecyclerViewDragDropManager.setDraggingItemShadowDrawable(
            (NinePatchDrawable) ContextCompat.getDrawable(mContext, R.drawable.material_shadow_z3));

    //start dragging after long press
    mRecyclerViewDragDropManager.setInitiateOnLongPress(true);
    mRecyclerViewDragDropManager.setInitiateOnMove(false);
    mRecyclerViewDragDropManager.setLongPressTimeout(Const.LONG_PRESS_DRAG_TIMEOUT);
}

private void setWrappedAdapter(DraggableGridAdapter draggableGridAdapter) {
    mAdapter = draggableGridAdapter;

    mWrappedAdapter = mRecyclerViewDragDropManager.createWrappedAdapter(draggableGridAdapter); //wrap for dragging

    final GeneralItemAnimator animator = new RefactoredDefaultItemAnimator();

    mRecyclerView.setLayoutManager(mLayoutManager);
    mRecyclerView.setAdapter(mWrappedAdapter); // requires *wrapped* adapter
    mRecyclerView.setItemAnimator(animator);

    if (supportsViewElevation()) {
        // Lollipop or later has native drop shadow feature. ItemShadowDecorator is not required.
    } else {
        mRecyclerView.addItemDecoration(new ItemShadowDecorator((NinePatchDrawable)
                ContextCompat.getDrawable(mContext, R.drawable.material_shadow_z1)));
    }

    mRecyclerViewDragDropManager.attachRecyclerView(mRecyclerView);

    mRecyclerViewDragDropManager.setItemMoveMode(RecyclerViewDragDropManager.ITEM_MOVE_MODE_DEFAULT);
    mAdapter.setItemMoveMode(RecyclerViewDragDropManager.ITEM_MOVE_MODE_DEFAULT);
}

适配器代码：

public class DraggableGridAdapter extends RecyclerView.Adapter<DraggableGridAdapter.MyViewHolder>
    implements DraggableItemAdapter<DraggableGridAdapter.MyViewHolder> {

private static final String TAG = "MyDraggableItemAdapter";
private int mItemMoveMode = RecyclerViewDragDropManager.ITEM_MOVE_MODE_DEFAULT;

// NOTE: Make accessible with short name
private interface Draggable extends DraggableItemConstants {
}

private AbstractDataProvider mProvider;

public static class MyViewHolder extends AbstractDraggableItemViewHolder {
    public FrameLayout mContainer;
    public View mDragHandle;
    public TextView mTextView;

    public MyViewHolder(View v) {
        super(v);
        mContainer = (FrameLayout) v.findViewById(R.id.container);
        mDragHandle = v.findViewById(R.id.drag_handle);
        mTextView = (TextView) v.findViewById(android.R.id.text1);
    }
}

public DraggableGridAdapter(AbstractDataProvider dataProvider) {
    mProvider = dataProvider;

    // DraggableItemAdapter requires stable ID, and also
    // have to implement the getItemId() method appropriately.
    // Ids must be unique not changing with position.
    setHasStableIds(true);
}

public void setItemMoveMode(int itemMoveMode) {
    mItemMoveMode = itemMoveMode;
}

@Override
public long getItemId(int position) {
    return mProvider.getItem(position).getId();
}

@Override
public int getItemViewType(int position) {
    return mProvider.getItem(position).getViewType();
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    final View v = inflater.inflate(R.layout.list_grid_item, parent, false);
    return new MyViewHolder(v);
}

@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
    final AbstractDataProvider.Data item = mProvider.getItem(position);

    // TODO: 2016-09-09 Add switch for checklist items

    //set text
    holder.mTextView.setText(item.getPlainText());

    final int dragState = holder.getDragStateFlags();

    if (((dragState & Draggable.STATE_FLAG_IS_UPDATED) != 0)) {
        int bgResId;

        if ((dragState & Draggable.STATE_FLAG_IS_ACTIVE) != 0) {
            bgResId = R.drawable.bg_item_dragging_active_state;
            com.example.Utilities.DrawableUtils.clearState(holder.mContainer.getForeground());
        } else if ((dragState & Draggable.STATE_FLAG_DRAGGING) != 0) {
            bgResId = R.drawable.bg_item_dragging_state;
        } else {
            bgResId = R.drawable.bg_item_normal_state;
        }
        holder.mContainer.setBackgroundResource(bgResId);
    }

}


@Override
public int getItemCount() {
    return mProvider.getCount();
}

@Override
public void onMoveItem(int fromPosition, int toPosition) {
    Log.d(TAG, "onMoveItem(fromPosition = " + fromPosition + ", toPosition = " + toPosition + ")");

    if (fromPosition == toPosition) {
        return;
    }

    if (mItemMoveMode == RecyclerViewDragDropManager.ITEM_MOVE_MODE_DEFAULT) {
        mProvider.moveItem(fromPosition, toPosition);
        notifyItemMoved(fromPosition, toPosition);
    } else {
        mProvider.swapItem(fromPosition, toPosition);
        notifyDataSetChanged();
    }
}

@Override
public boolean onCheckCanStartDrag(MyViewHolder holder, int position, int x, int y) {
    return true;
}

@Override
public ItemDraggableRange onGetItemDraggableRange(MyViewHolder holder, int position) {
    // no drag-sortable range specified
    return null;
}

@Override
public boolean onCheckCanDrop(int draggingPosition, int dropPosition) {
    return true;
}

这是我试过但没有成功的示例代码，来自 onBindViewHolder 方法中的适配器：

public void onBindViewHolder(MyViewHolder holder, final int position) {

    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Log.d(TAG, "Clicked " + position);
        }
    });
}

Answer 1

好的，所以，我的问题的解决方案是 将 onBindViewHolder 中的侦听器分配给 mContainer 而不是 itemView。

public void onBindViewHolder(MyViewHolder holder, final int position) {

holder.mContainer.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Log.d(TAG, "Clicked " + position);
    }
});
}

由于布局 xml.

中的 clickable="true" 语句，mContainer framelayout 消耗了所有点击次数

<FrameLayout
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clickable="true"
    android:foreground="?attr/selectableItemBackground"
    tools:ignore="UselessParent">

    <TextView
        android:id="@android:id/text1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="top|left"
        android:gravity="center"
        tools:ignore="RtlHardcoded"/>

</FrameLayout>

Advanced Recycler View - 处理项目点击和长按拖动操作

Advanced Recycler View - Handling on item click and long click drag operations

android

drag-and-drop

android-recyclerview

onitemclicklistener