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，这是有效的。我不确定如何实现这一点。

我将OnClick监听器附加到删除按钮，该按钮可以正常工作（删除行），但它也会触发完整行上的onclick。

如果点击一个按钮，任何人都可以帮我解决如何避免全行点击。

感谢。

Answer 1

这就是我在recyclelerView中处理多个onClick事件的方法：

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

定义界面：

public interface ClickListener {

    void onPositionClicked(int position);

    void onLongClicked(int position);
}

然后适配器：

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;
        }
    }
}

然后在你的活动/片段中 - 无论你可以实现什么：Clicklistener - 或者如果你愿意的话都是匿名课：

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
            }
        });

要获取单击的项目，您将匹配视图ID，即v.getId（）== whateverItem.getId（）

希望这种方法有所帮助！

Answer 2

我通常会发现：

我需要使用多个监听器，因为我有几个按钮。
我希望我的逻辑位于活动中，而不是适配器或视图。

所以@ mark-keen的答案很有效但是有一个界面可以提供更大的灵活性：

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());
            }
        });
    }
}

在适配器中定义了onClickListener：

public MyAdapterListener onClickListener;

public interface MyAdapterListener {

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

可能通过构造函数设置：

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

    rows = newRows;
    onClickListener = listener;
}

然后，您可以处理Activity中的事件或使用RecyclerView的任何地方：

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 3

我想要一个没有创建任何额外对象（即侦听器）的解决方案，这些对象必须在以后进行垃圾收集，并且不需要在适配器类中嵌套视图持有者。

在ViewHolder班级

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onClick方法中没有假设它已初始化。

ClickHandler界面如下所示：

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

在适配器中，在构造函数中设置一个'ClickHandler'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可能会使用完全相同的值多次设置，但这比检查null和分支更便宜，而且没有内存开销，只需要额外的指令。 / em>的

最后，在创建适配器时，您必须将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 } });

请注意，此处adapter是成员变量，而非本地变量

Answer 4

如果您已经拥有一个回收器触摸侦听器，并希望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，则只想添加另一个解决方案。这个改编版本的关键是在点击时返回onItemClick（）回调中的按钮视图，而不是项容器。然后，您可以测试作为按钮的视图，并执行不同的操作。请注意，长按此按钮会被解释为长按整个行。

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 / fragment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 5

处理点击事件时，您需要在onInterceptTouchEvent()内返回true。

Answer 6

您可以先检查是否有任何类似的条目，如果您收到大小为0的集合，请开始新的查询以保存。

OR

更专业，更快捷的方式。创建云触发器（保存前）

看看这个答案 https://stackoverflow.com/a/35194514/1388852

Answer 7

只需放置一个名为getItemId的重写方法通过右键单击>生成>覆盖方法> getItemId来获取它将此方法放在Adapter类中

处理按钮在RecyclerView中的行内单击

7 个答案: