在 RecyclerView 的一行内单击处理按钮

Question

我正在使用以下代码来处理行点击。 (source)

static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {

    private GestureDetector gestureDetector;
    private ClickListener clickListener;

    public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener clickListener) {
        this.clickListener = clickListener;
        gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;
            }

            @Override
            public void onLongPress(MotionEvent e) {
                View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
                if (child != null && clickListener != null) {
                    clickListener.onLongClick(child, recyclerView.getChildPosition(child));
                }
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {

        View child = rv.findChildViewUnder(e.getX(), e.getY());
        if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
            clickListener.onClick(child, rv.getChildPosition(child));
        }
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
    }
}

但是，如果我想在每一行上说一个删除按钮，这会起作用。我不确定如何用它来实现它。

我将 OnClick 侦听器附加到有效的删除按钮（删除行），但它也会在整行上触发 onclick。

任何人都可以帮助我如何在单击单个按钮时避免整行单击。

谢谢。

Answer 1

当您处理点击事件时，您需要在 onInterceptTouchEvent() 中 return 为真。

Answer 2

这是我在 recyclerView 中处理多个 onClick 事件的方式：

编辑： 已更新以包含回调（如其他评论中所述）。我在 ViewHolder 中使用了 WeakReference 来消除潜在的内存泄漏。

定义接口：

public interface ClickListener {

    void onPositionClicked(int position);
    
    void onLongClicked(int position);
}

然后是适配器：

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    
    private final ClickListener listener;
    private final List<MyItems> itemsList;

    public MyAdapter(List<MyItems> itemsList, ClickListener listener) {
        this.listener = listener;
        this.itemsList = itemsList;
    }

    @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return new MyViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.my_row_layout), parent, false), listener);
    }

    @Override public void onBindViewHolder(MyViewHolder holder, int position) {
        // bind layout and data etc..
    }

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

    public static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {

        private ImageView iconImageView;
        private TextView iconTextView;
        private WeakReference<ClickListener> listenerRef;

        public MyViewHolder(final View itemView, ClickListener listener) {
            super(itemView);

            listenerRef = new WeakReference<>(listener);
            iconImageView = (ImageView) itemView.findViewById(R.id.myRecyclerImageView);
            iconTextView = (TextView) itemView.findViewById(R.id.myRecyclerTextView);

            itemView.setOnClickListener(this);
            iconTextView.setOnClickListener(this);
            iconImageView.setOnLongClickListener(this);
        }

        // onClick Listener for view
        @Override
        public void onClick(View v) {

            if (v.getId() == iconTextView.getId()) {
                Toast.makeText(v.getContext(), "ITEM PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
            }
            
            listenerRef.get().onPositionClicked(getAdapterPosition());
        }


        //onLongClickListener for view
        @Override
        public boolean onLongClick(View v) {

            final AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
            builder.setTitle("Hello Dialog")
                    .setMessage("LONG CLICK DIALOG WINDOW FOR ICON " + String.valueOf(getAdapterPosition()))
                    .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    });

            builder.create().show();
            listenerRef.get().onLongClicked(getAdapterPosition());
            return true;
        }
    }
}

然后在你的 activity/fragment - 无论你能实现什么：Clicklistener - 或者匿名 class 如果你愿意的话：

MyAdapter adapter = new MyAdapter(myItems, new ClickListener() {
            @Override public void onPositionClicked(int position) {
                // callback performed on click
            }

            @Override public void onLongClicked(int position) {
                // callback performed on click
            }
        });

要获得点击的项目，您需要匹配视图 ID，即 v.getId() == whateverItem.getId()

希望此方法有所帮助！

Answer 3

我发现通常：

我需要使用多个监听器，因为我有几个按钮。
我希望我的逻辑在 activity 而不是适配器或查看器中。

所以@mark-keen 的答案很有效，但是有一个接口提供了更大的灵活性：

public static class MyViewHolder extends RecyclerView.ViewHolder {

    public ImageView iconImageView;
    public TextView iconTextView;

    public MyViewHolder(final View itemView) {
        super(itemView);

        iconImageView = (ImageView) itemView.findViewById(R.id.myRecyclerImageView);
        iconTextView = (TextView) itemView.findViewById(R.id.myRecyclerTextView);

        iconTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onClickListener.iconTextViewOnClick(v, getAdapterPosition());
            }
        });
        iconImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onClickListener.iconImageViewOnClick(v, getAdapterPosition());
            }
        });
    }
}

在您的适配器中定义 onClickListener 的位置：

public MyAdapterListener onClickListener;

public interface MyAdapterListener {

    void iconTextViewOnClick(View v, int position);
    void iconImageViewOnClick(View v, int position);
}

并且可能通过您的构造函数设置：

public MyAdapter(ArrayList<MyListItems> newRows, MyAdapterListener listener) {

    rows = newRows;
    onClickListener = listener;
}

然后你可以在你的 Activity 或任何使用你的 RecyclerView 的地方处理事件：

mAdapter = new MyAdapter(mRows, new MyAdapter.MyAdapterListener() {
                    @Override
                    public void iconTextViewOnClick(View v, int position) {
                        Log.d(TAG, "iconTextViewOnClick at position "+position);
                    }

                    @Override
                    public void iconImageViewOnClick(View v, int position) {
                        Log.d(TAG, "iconImageViewOnClick at position "+position);
                    }
                });
mRecycler.setAdapter(mAdapter);

Answer 4

我想要一个不创建任何 extra 对象（即侦听器）的解决方案，这些对象稍后必须被垃圾收集，并且不需要在适配器中嵌套视图持有者class.

在ViewHolderclass

private static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        private final TextView ....// declare the fields in your view
        private ClickHandler ClickHandler;

        public MyHolder(final View itemView) {
            super(itemView);
            nameField = (TextView) itemView.findViewById(R.id.name);
            //find other fields here...
            Button myButton = (Button) itemView.findViewById(R.id.my_button);
            myButton.setOnClickListener(this);
        }
        ...
        @Override
        public void onClick(final View view) {
            if (clickHandler != null) {
                clickHandler.onMyButtonClicked(getAdapterPosition());
            }
        }

注意事项：ClickHandler 接口已定义，但未在此处初始化，因此在 onClick 方法中没有假设它曾经被初始化。

ClickHandler 界面如下所示：

private interface ClickHandler {
    void onMyButtonClicked(final int position);
}

在适配器中，在构造函数中设置 'ClickHandler' 的实例，并覆盖 onBindViewHolder，以在视图持有者上初始化 `clickHandler'：

private class MyAdapter extends ...{

    private final ClickHandler clickHandler;

    public MyAdapter(final ClickHandler clickHandler) {
        super(...);
        this.clickHandler = clickHandler;
    }

    @Override
    public void onBindViewHolder(final MyViewHolder viewHolder, final int position) {
        super.onBindViewHolder(viewHolder, position);
        viewHolder.clickHandler = this.clickHandler;
    }

注意：我知道 viewHolder.clickHandler 可能会多次设置完全相同的值，但这比检查 null 和分支要便宜，而且没有内存成本，只是一个额外的说明。

最后，当您创建适配器时，您被迫将一个 ClickHandler 实例传递给构造函数，如下所示：

adapter = new MyAdapter(new ClickHandler() {
    @Override
    public void onMyButtonClicked(final int position) {
        final MyModel model = adapter.getItem(position);
        //do something with the model where the button was clicked
    }
});

注意这里adapter是成员变量，不是局部变量

Answer 5

如果您已经有一个回收站触摸侦听器并且想要处理其中的所有触摸事件而不是在视图持有者中单独处理按钮触摸事件，那么只想添加另一个解决方案。 class 的这个改编版本所做的关键事情是 return onItemClick() 回调中的按钮视图，当它被点击时，而不是项目容器。然后，您可以测试视图是否为按钮，并执行不同的操作。请注意，长按按钮仍被解释为长按整行。

public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener
{
    public static interface OnItemClickListener
    {
        public void onItemClick(View view, int position);
        public void onItemLongClick(View view, int position);
    }

    private OnItemClickListener mListener;
    private GestureDetector mGestureDetector;

    public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener)
    {
        mListener = listener;

        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener()
        {
            @Override
            public boolean onSingleTapUp(MotionEvent e)
            {
                // Important: x and y are translated coordinates here
                final ViewGroup childViewGroup = (ViewGroup) recyclerView.findChildViewUnder(e.getX(), e.getY());

                if (childViewGroup != null && mListener != null) {
                    final List<View> viewHierarchy = new ArrayList<View>();
                    // Important: x and y are raw screen coordinates here
                    getViewHierarchyUnderChild(childViewGroup, e.getRawX(), e.getRawY(), viewHierarchy);

                    View touchedView = childViewGroup;
                    if (viewHierarchy.size() > 0) {
                        touchedView = viewHierarchy.get(0);
                    }
                    mListener.onItemClick(touchedView, recyclerView.getChildPosition(childViewGroup));
                    return true;
                }

                return false;
            }

            @Override
            public void onLongPress(MotionEvent e)
            {
                View childView = recyclerView.findChildViewUnder(e.getX(), e.getY());

                if(childView != null && mListener != null)
                {
                    mListener.onItemLongClick(childView, recyclerView.getChildPosition(childView));
                }
            }
        });
    }

    public void getViewHierarchyUnderChild(ViewGroup root, float x, float y, List<View> viewHierarchy) {
        int[] location = new int[2];
        final int childCount = root.getChildCount();

        for (int i = 0; i < childCount; ++i) {
            final View child = root.getChildAt(i);
            child.getLocationOnScreen(location);
            final int childLeft = location[0], childRight = childLeft + child.getWidth();
            final int childTop = location[1], childBottom = childTop + child.getHeight();

            if (child.isShown() && x >= childLeft && x <= childRight && y >= childTop && y <= childBottom) {
                viewHierarchy.add(0, child);
            }
            if (child instanceof ViewGroup) {
                getViewHierarchyUnderChild((ViewGroup) child, x, y, viewHierarchy);
            }
        }
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e)
    {
        mGestureDetector.onTouchEvent(e);

        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView view, MotionEvent motionEvent){}

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }
}

然后从activity/片段中使用它：

recyclerView.addOnItemTouchListener(createItemClickListener(recyclerView));

    public RecyclerItemClickListener createItemClickListener(final RecyclerView recyclerView) {
        return new RecyclerItemClickListener (context, recyclerView, new RecyclerItemClickListener.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                if (view instanceof AppCompatButton) {
                    // ... tapped on the button, so go do something
                } else {
                    // ... tapped on the item container (row), so do something different
                }
            }

            @Override
            public void onItemLongClick(View view, int position) {
            }
        });
    }

Answer 6

您可以先检查是否有类似的条目，如果您得到大小为0的集合，请重新开始查询以保存。

或

更专业、更快捷的方式。创建云触发器（保存前）

查看此答案

Answer 7

只需放置一个名为 getItemId 的覆盖方法通过右键单击>生成>覆盖方法>getItemId获取把这个方法放在 Adapter class

在 RecyclerView 的一行内单击处理按钮

Handle Button click inside a row in RecyclerView

android

android-recyclerview