安卓实现对Item长按点击事件

首先在Adapter里定义

 public interface OnItemClickListener{
        void onItemLongClick(View view,int pos);
    }

    private OnItemClickListener onItemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

在onBindViewHolder里:

if (onItemClickListener!=null){
            holder.view.setOnLongClickListener(new View.OnLongClickListener() {
                @Override
                public boolean onLongClick(View v) {
                    onItemClickListener.onItemLongClick(holder.view,position);
                    return false;
                }
            });
        }

在res定义menu的directory,在里面创建item_pop.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/unread"
        android:title="标为未读" />
    <item
        android:id="@+id/top"
        android:title="置顶聊天" />
    <item
        android:id="@+id/delete"
        android:title="删除该聊天" />
</menu>

然后在activity中 

private void initClick() {
        userAdapter.setOnItemClickListener(new UserAdapter.OnItemClickListener() {
            @Override
            public void onItemLongClick(View view, int pos) {
                PopupMenu popupMenu = new PopupMenu(getContext(), view);
                popupMenu.getMenuInflater().inflate(R.menu.item_pop, popupMenu.getMenu());
                popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    @Override
                    public boolean onMenuItemClick(MenuItem item) {
                        switch (item.getItemId()) {
                            case R.id.unread:
                                Toast.makeText(getContext(), "123", Toast.LENGTH_SHORT).show();
                                break;
                            case R.id.top:
                                Toast.makeText(getContext(), "1234", Toast.LENGTH_SHORT).show();
                                break;
                            case R.id.delete:
                                Toast.makeText(getContext(), "456", Toast.LENGTH_SHORT).show();
                                break;
                            default:
                                break;
                        }
                        return false;
                    }
                });
                popupMenu.show();
            }
        });
    }