[英]Why doesn't RecyclerView have onItemClickListener()?
我正在探索RecyclerView
并且惊讶地发现RecyclerView
没有onItemClickListener()
。
我有两个问题。
我想知道为什么 Google 删除了onItemClickListener()
?
是否存在性能问题或其他问题?
我通过在RecyclerView.Adapter
编写onClick
解决了我的问题:
public static class ViewHolder extends RecyclerView.ViewHolder implements OnClickListener {
public TextView txtViewTitle;
public ImageView imgViewIcon;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.item_title);
imgViewIcon = (ImageView) itemLayoutView.findViewById(R.id.item_icon);
}
@Override
public void onClick(View v) {
}
}
可以吗/有更好的方法吗?
tl;dr 2016使用 RxJava 和 PublishSubject 为点击公开 Observable。
public class ReactiveAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
String[] mDataset = { "Data", "In", "Adapter" };
private final PublishSubject<String> onClickSubject = PublishSubject.create();
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
final String element = mDataset[position];
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onClickSubject.onNext(element);
}
});
}
public Observable<String> getPositionClicks(){
return onClickSubject.asObservable();
}
}
原帖:
自从引入ListView
以来, onItemClickListener
一直存在问题。 当您拥有任何内部元素的点击侦听器时,不会触发回调,但没有通知或详细记录(如果有的话),因此存在很多混淆和问题。
鉴于RecyclerView
更进一步,没有行/列的概念,而是任意布置的子项数量,他们已将 onClick 委托给每个人,或委托给程序员实现。
不要将Recyclerview
视为ListView
1:1 的替代品,而是将其视为适用于复杂用例的更灵活的组件。 正如您所说,您的解决方案正是谷歌对您的期望。 现在你有了一个适配器,它可以将 onClick 委托给传递给构造函数的接口,这是ListView
和Recyclerview
的正确模式。
public static class ViewHolder extends RecyclerView.ViewHolder implements OnClickListener {
public TextView txtViewTitle;
public ImageView imgViewIcon;
public IMyViewHolderClicks mListener;
public ViewHolder(View itemLayoutView, IMyViewHolderClicks listener) {
super(itemLayoutView);
mListener = listener;
txtViewTitle = (TextView) itemLayoutView.findViewById(R.id.item_title);
imgViewIcon = (ImageView) itemLayoutView.findViewById(R.id.item_icon);
imgViewIcon.setOnClickListener(this);
itemLayoutView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v instanceof ImageView){
mListener.onTomato((ImageView)v);
} else {
mListener.onPotato(v);
}
}
public static interface IMyViewHolderClicks {
public void onPotato(View caller);
public void onTomato(ImageView callerImage);
}
}
然后在你的适配器上
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
String[] mDataset = { "Data" };
@Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_layout, parent, false);
MyAdapter.ViewHolder vh = new ViewHolder(v, new MyAdapter.ViewHolder.IMyViewHolderClicks() {
public void onPotato(View caller) { Log.d("VEGETABLES", "Poh-tah-tos"); };
public void onTomato(ImageView callerImage) { Log.d("VEGETABLES", "To-m8-tohs"); }
});
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
// Get element from your dataset at this position
// Replace the contents of the view with that element
// Clear the ones that won't be used
holder.txtViewTitle.setText(mDataset[position]);
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return mDataset.length;
}
...
现在查看最后一段代码: onCreateViewHolder(ViewGroup parent, int viewType)
签名已经建议了不同的视图类型。 对于它们中的每一个,您也需要一个不同的查看器,随后它们中的每一个都可以有一组不同的点击。 或者,您可以创建一个通用的 viewholder,它接受任何视图和一个onClickListener
并相应地应用。 或者将一级委托给协调器,以便多个片段/活动具有相同的列表,但单击行为不同。 同样,所有灵活性都在您身边。
它是一个真正需要的组件,并且非常接近我们迄今为止对ListView
内部实现和改进。 好在谷歌终于承认了。
onItemClickListener
RecyclerView
是一个工具箱,与旧的ListView
相比,它具有更少的内置功能和更多的灵活性。 onItemClickListener
并不是从 ListView 中删除的唯一功能。 但是它有很多听众和方法可以根据您的喜好扩展它,在正确的人手中它会更强大;)。
在我看来,在RecyclerView
删除的最复杂的功能是Fast Scroll 。 大多数其他功能都可以轻松重新实现。
如果您想了解其他很酷的功能RecyclerView
加入阅读这个回答另一个问题。
该解决方案是在RecyclerView
发布后,由 Android GDE 的Hugo Visser 提出的。 他为您提供了一个无需许可证的课程,您只需放入代码并使用它即可。
它通过使用RecyclerView.OnChildAttachStateChangeListener
展示了RecyclerView
引入的一些多功能性。
2019 年编辑:我的 kotlin 版本,Java 一,来自 Hugo Visser,保留在下面
创建一个文件values/ids.xml
并将其放入其中:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item name="item_click_support" type="id" />
</resources>
然后将下面的代码添加到您的源代码中
用法:
recyclerView.onItemClick { recyclerView, position, v ->
// do it
}
(它还支持长项单击,请参阅下面我添加的另一个功能)。
实现(我对 Hugo Visser Java 代码的改编):
typealias OnRecyclerViewItemClickListener = (recyclerView: RecyclerView, position: Int, v: View) -> Unit
typealias OnRecyclerViewItemLongClickListener = (recyclerView: RecyclerView, position: Int, v: View) -> Boolean
class ItemClickSupport private constructor(private val recyclerView: RecyclerView) {
private var onItemClickListener: OnRecyclerViewItemClickListener? = null
private var onItemLongClickListener: OnRecyclerViewItemLongClickListener? = null
private val attachListener: RecyclerView.OnChildAttachStateChangeListener = object : RecyclerView.OnChildAttachStateChangeListener {
override fun onChildViewAttachedToWindow(view: View) {
// every time a new child view is attached add click listeners to it
val holder = this@ItemClickSupport.recyclerView.getChildViewHolder(view)
.takeIf { it is ItemClickSupportViewHolder } as? ItemClickSupportViewHolder
if (onItemClickListener != null && holder?.isClickable != false) {
view.setOnClickListener(onClickListener)
}
if (onItemLongClickListener != null && holder?.isLongClickable != false) {
view.setOnLongClickListener(onLongClickListener)
}
}
override fun onChildViewDetachedFromWindow(view: View) {
}
}
init {
// the ID must be declared in XML, used to avoid
// replacing the ItemClickSupport without removing
// the old one from the RecyclerView
this.recyclerView.setTag(R.id.item_click_support, this)
this.recyclerView.addOnChildAttachStateChangeListener(attachListener)
}
companion object {
fun addTo(view: RecyclerView): ItemClickSupport {
// if there's already an ItemClickSupport attached
// to this RecyclerView do not replace it, use it
var support: ItemClickSupport? = view.getTag(R.id.item_click_support) as? ItemClickSupport
if (support == null) {
support = ItemClickSupport(view)
}
return support
}
fun removeFrom(view: RecyclerView): ItemClickSupport? {
val support = view.getTag(R.id.item_click_support) as? ItemClickSupport
support?.detach(view)
return support
}
}
private val onClickListener = View.OnClickListener { v ->
val listener = onItemClickListener ?: return@OnClickListener
// ask the RecyclerView for the viewHolder of this view.
// then use it to get the position for the adapter
val holder = this.recyclerView.getChildViewHolder(v)
listener.invoke(this.recyclerView, holder.adapterPosition, v)
}
private val onLongClickListener = View.OnLongClickListener { v ->
val listener = onItemLongClickListener ?: return@OnLongClickListener false
val holder = this.recyclerView.getChildViewHolder(v)
return@OnLongClickListener listener.invoke(this.recyclerView, holder.adapterPosition, v)
}
private fun detach(view: RecyclerView) {
view.removeOnChildAttachStateChangeListener(attachListener)
view.setTag(R.id.item_click_support, null)
}
fun onItemClick(listener: OnRecyclerViewItemClickListener?): ItemClickSupport {
onItemClickListener = listener
return this
}
fun onItemLongClick(listener: OnRecyclerViewItemLongClickListener?): ItemClickSupport {
onItemLongClickListener = listener
return this
}
}
/** Give click-ability and long-click-ability control to the ViewHolder */
interface ItemClickSupportViewHolder {
val isClickable: Boolean get() = true
val isLongClickable: Boolean get() = true
}
// Extension function
fun RecyclerView.addItemClickSupport(configuration: ItemClickSupport.() -> Unit = {}) = ItemClickSupport.addTo(this).apply(configuration)
fun RecyclerView.removeItemClickSupport() = ItemClickSupport.removeFrom(this)
fun RecyclerView.onItemClick(onClick: OnRecyclerViewItemClickListener) {
addItemClickSupport { onItemClick(onClick) }
}
fun RecyclerView.onItemLongClick(onLongClick: OnRecyclerViewItemLongClickListener) {
addItemClickSupport { onItemLongClick(onLongClick) }
}
(记住你还需要添加一个 XML 文件,见上面这部分)
有时您不希望 RecyclerView 的所有项目都可点击。
为了解决这个问题,我引入了ItemClickSupportViewHolder
接口,您可以在ViewHolder
上使用ViewHolder
来控制可点击的项目。
例子:
class MyViewHolder(view): RecyclerView.ViewHolder(view), ItemClickSupportViewHolder {
override val isClickable: Boolean get() = false
override val isLongClickable: Boolean get() = false
}
用法:
ItemClickSupport.addTo(mRecyclerView)
.setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
@Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
// do it
}
});
(它还支持长项点击)
实现(我添加的评论):
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) {
// ask the RecyclerView for the viewHolder of this view.
// then use it to get the position for the adapter
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) {
// every time a new child view is attached add click listeners to it
if (mOnItemClickListener != null) {
view.setOnClickListener(mOnClickListener);
}
if (mOnItemLongClickListener != null) {
view.setOnLongClickListener(mOnLongClickListener);
}
}
@Override
public void onChildViewDetachedFromWindow(View view) {
}
};
private ItemClickSupport(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
// the ID must be declared in XML, used to avoid
// replacing the ItemClickSupport without removing
// the old one from the RecyclerView
mRecyclerView.setTag(R.id.item_click_support, this);
mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
}
public static ItemClickSupport addTo(RecyclerView view) {
// if there's already an ItemClickSupport attached
// to this RecyclerView do not replace it, use it
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);
}
}
这个类的工作由一个连接RecyclerView.OnChildAttachStateChangeListener
到RecyclerView
。 每次从RecyclerView
附加或分离子项时都会通知此侦听器。 代码使用它向视图附加一个点击/长按侦听器。 该侦听器向RecyclerView
询问包含位置的RecyclerView.ViewHolder
。
这比其他解决方案更有效,因为它避免为每个视图创建多个侦听器,并在滚动RecyclerView
不断销毁和创建它们。
如果您需要更多,您还可以修改代码以将持有人本身归还给您。
请记住,通过在列表的每个视图上设置一个单击侦听器来在您的适配器中处理它是完全没问题的,就像其他建议的答案一样。
这不是最有效的做法(每次重用视图时都会创建一个新的侦听器),但它可以工作,并且在大多数情况下这不是问题。
这也有点反对关注点分离,因为委派点击事件并不是适配器的真正工作。
我喜欢这种方式并且我正在使用它
里面
public Adapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
放
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_image_and_text, parent, false);
v.setOnClickListener(new MyOnClickListener());
并在任何你想要的地方创建这个类
class MyOnClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
int itemPosition = recyclerView.indexOfChild(v);
Log.e("Clicked and Position is ",String.valueOf(itemPosition));
}
}
我之前读过有一种更好的方法,但我喜欢这种方法简单而不复杂。
Android Recyclerview 使用onItemClickListener
,为什么我们不能尝试它只像ListView
一样工作。
来源:链接
public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
private OnItemClickListener mListener;
public interface OnItemClickListener {
public void onItemClick(View view, int position);
}
GestureDetector mGestureDetector;
public RecyclerItemClickListener(Context context, OnItemClickListener listener) {
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
并将其设置为 RecyclerView:
recyclerView = (RecyclerView)rootView. findViewById(R.id.recyclerView);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(getActivity(), new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
// TODO Handle item click
Log.e("@@@@@",""+position);
}
})
);
感谢@marmor,我更新了我的答案。
我认为在ViewHolder类构造函数中处理 onClick() 并通过OnItemClickListener接口将其传递给父类是一个很好的解决方案。
我的适配器
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
private LayoutInflater layoutInflater;
private List<MyObject> items;
private AdapterView.OnItemClickListener onItemClickListener;
public MyAdapter(Context context, AdapterView.OnItemClickListener onItemClickListener, List<MyObject> items) {
layoutInflater = LayoutInflater.from(context);
this.items = items;
this.onItemClickListener = onItemClickListener;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = layoutInflater.inflate(R.layout.my_row_layout, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
MyObject item = items.get(position);
}
public MyObject getItem(int position) {
return items.get(position);
}
class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView title;
private ImageView avatar;
public ViewHolder(View itemView) {
super(itemView);
title = itemView.findViewById(R.id.title);
avatar = itemView.findViewById(R.id.avatar);
title.setOnClickListener(this);
avatar.setOnClickListener(this);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
//passing the clicked position to the parent class
onItemClickListener.onItemClick(null, view, getAdapterPosition(), view.getId());
}
}
}
适配器在其他类中的使用:
我的片段
public class MyFragment extends Fragment implements AdapterView.OnItemClickListener {
private RecyclerView recycleview;
private MyAdapter adapter;
.
.
.
private void init(Context context) {
//passing this fragment as OnItemClickListener to the adapter
adapter = new MyAdapter(context, this, items);
recycleview.setAdapter(adapter);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//you can get the clicked item from the adapter using its position
MyObject item = adapter.getItem(position);
//you can also find out which view was clicked
switch (view.getId()) {
case R.id.title:
//title view was clicked
break;
case R.id.avatar:
//avatar view was clicked
break;
default:
//the whole row was clicked
}
}
}
伙计们在您的主要活动中使用此代码。 非常有效的方法
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.users_list);
UsersAdapter adapter = new UsersAdapter(users, this);
recyclerView.setAdapter(adapter);
adapter.setOnCardClickListner(this);
这是您的 Adapter 类。
public class UsersAdapter extends RecyclerView.Adapter<UsersAdapter.UserViewHolder> {
private ArrayList<User> mDataSet;
OnCardClickListner onCardClickListner;
public UsersAdapter(ArrayList<User> mDataSet) {
this.mDataSet = mDataSet;
}
@Override
public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.user_row_layout, parent, false);
UserViewHolder userViewHolder = new UserViewHolder(v);
return userViewHolder;
}
@Override
public void onBindViewHolder(UserViewHolder holder, final int position) {
holder.name_entry.setText(mDataSet.get(position).getUser_name());
holder.cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
onCardClickListner.OnCardClicked(v, position);
}
});
}
@Override
public int getItemCount() {
return mDataSet.size();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public static class UserViewHolder extends RecyclerView.ViewHolder {
CardView cardView;
TextView name_entry;
public UserViewHolder(View itemView) {
super(itemView);
cardView = (CardView) itemView.findViewById(R.id.user_layout);
name_entry = (TextView) itemView.findViewById(R.id.name_entry);
}
}
public interface OnCardClickListner {
void OnCardClicked(View view, int position);
}
public void setOnCardClickListner(OnCardClickListner onCardClickListner) {
this.onCardClickListner = onCardClickListner;
}
}
在此之后,您将在您的活动中获得此覆盖方法。
@Override
public void OnCardClicked(View view, int position) {
Log.d("OnClick", "Card Position" + position);
}
> RecyclerView 与 Listview 有何不同?
一个区别是有一个带有 RecyclerView 的LayoutManager
类,您可以通过它来管理您的RecyclerView
-
通过
LinearLayoutManager
水平或垂直滚动GridLayoutManager 的
GridLayoutManager
交错的网格布局由
StaggeredGridLayoutManager
就像 RecyclerView 的水平滚动一样-
LinearLayoutManager llm = new LinearLayoutManager(context);
llm.setOrientation(LinearLayoutManager.HORIZONTAL);
recyclerView.setLayoutManager(llm);
如何将它们放在一起示例...
public class OrderListCursorAdapter extends CursorRecyclerViewAdapter<OrderListCursorAdapter.ViewHolder> { private static final String TAG = OrderListCursorAdapter.class.getSimpleName(); private static final int ID_VIEW_HOLDER_ACTUAL = 0; private static final int ID_VIEW_HOLDER = 1; public OrderListCursorAdapter(Context context, Cursor cursor) { super(context, cursor); } public static class ViewHolderActual extends ViewHolder { private static final String TAG = ViewHolderActual.class.getSimpleName(); protected IViewHolderClick listener; protected Button button; public ViewHolderActual(View v, IViewHolderClick listener) { super(v, listener); this.listener = listener; button = (Button) v.findViewById(R.id.orderList_item_button); button.setOnClickListener(this); } public void initFromData(OrderData data) { Log.d(TAG, "><initFromData(data=" + data + ")"); orderId = data.getId(); vAddressStart.setText(data.getAddressStart()); vAddressEnd.setText(data.getAddressEnd()); } @Override public void onClick(View view) { if (view instanceof Button) { listener.onButtonClick((Button) view, getPosition(), this); } else { super.onClick(view); } } public interface IViewHolderClick extends ViewHolder.IViewHolderClick { public void onButtonClick(Button button, int position, ViewHolder viewHolder); } } public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { private static final String TAG = ViewHolder.class.getSimpleName(); protected long orderId; protected IViewHolderClick listener; protected TextView vAddressStart; protected TextView vAddressEnd; protected TextView vStatus; public ViewHolder(View v, IViewHolderClick listener) { super(v); this.listener = listener; v.setOnClickListener(this); vAddressStart = (TextView) v.findViewById(R.id.addressStart); vAddressEnd = (TextView) v.findViewById(R.id.addressEnd); vStatus = (TextView) v.findViewById(R.id.status); } public void initFromData(OrderData data) { Log.d(TAG, "><initFromData(data=" + data + ")"); orderId = data.getId(); vAddressStart.setText(data.getAddressStart()); vAddressEnd.setText(data.getAddressEnd()); } public long getOrderId() { return orderId; } @Override public void onClick(View view) { listener.onCardClick(view, getPosition(), this); } public interface IViewHolderClick { public void onCardClick(View view, int position, ViewHolder viewHolder); } } @Override public int getItemViewType(int position) { return position == 0 ? ID_VIEW_HOLDER_ACTUAL : ID_VIEW_HOLDER; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { Log.d(TAG, ">>onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")"); ViewHolder result; switch (viewType) { case ID_VIEW_HOLDER_ACTUAL: { View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout_actual, parent, false); result = new ViewHolderActual(itemView, new ViewHolderActual.IViewHolderClick() { @Override public void onCardClick(View view, int position, ViewHolder viewHolder) { Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")"); Intent intent = new Intent(view.getContext(), OrderDetailActivity.class); intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId()); view.getContext().startActivity(intent); } @Override public void onButtonClick(Button button, int position, ViewHolder viewHolder) { Log.d(TAG, "><onButtonClick(button=" + button + ", position=" + position + ", viewHolder=" + viewHolder + ")"); Intent intent = new Intent(button.getContext(), OrderMapActivity.class); intent.putExtra(OrderMapActivity.ARG_ORDER_ID, viewHolder.getOrderId()); button.getContext().startActivity(intent); } }); break; } case ID_VIEW_HOLDER: default: { View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_layout, parent, false); result = new ViewHolder(itemView, new ViewHolder.IViewHolderClick() { @Override public void onCardClick(View view, int position, ViewHolder viewHolder) { Log.d(TAG, "><onCardClick(view=" + view + ", position=" + position + ", viewHolder=" + viewHolder + ")"); Intent intent = new Intent(view.getContext(), OrderDetailActivity.class); intent.putExtra(OrderDetailActivity.ARG_ORDER_ID, viewHolder.getOrderId()); view.getContext().startActivity(intent); } }); break; } } Log.d(TAG, "<<onCreateViewHolder(parent=" + parent + ", viewType=" + viewType + ")= " + result); return result; } @Override public void onBindViewHolder(ViewHolder viewHolder, Cursor cursor) { Log.d(TAG, "><onBindViewHolder(viewHolder=" + viewHolder + ", cursor=" + cursor + ")"); final OrderData orderData = new OrderData(cursor); viewHolder.initFromData(orderData); } }
跟进MLProgrammer-CiM 的优秀 RxJava 解决方案
Consumer<String> mClickConsumer = new Consumer<String>() {
@Override
public void accept(@NonNull String element) throws Exception {
Toast.makeText(getApplicationContext(), element +" was clicked", Toast.LENGTH_LONG).show();
}
};
ReactiveAdapter rxAdapter = new ReactiveAdapter();
rxAdapter.getPositionClicks().subscribe(mClickConsumer);
将原来的tl;dr修改为:
public Observable<String> getPositionClicks(){
return onClickSubject;
}
PublishSubject#asObservable()
已删除。 只需返回PublishSubject
,它是一个Observable
。
据我了解MLProgrammer-CiM答案,只是可以这样做:
class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
private ImageView image;
private TextView title;
private TextView price;
public MyViewHolder(View itemView) {
super(itemView);
image = (ImageView)itemView.findViewById(R.id.horizontal_list_image);
title = (TextView)itemView.findViewById(R.id.horizontal_list_title);
price = (TextView)itemView.findViewById(R.id.horizontal_list_price);
image.setOnClickListener(this);
title.setOnClickListener(this);
price.setOnClickListener(this);
}
@Override
public void onClick(View v) {
Toast.makeText(context, "Item click nr: "+getLayoutPosition(), Toast.LENGTH_SHORT).show();
}
}
阅读@MLProgrammer-CiM的回答后,这是我的代码:
class NormalViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
@Bind(R.id.card_item_normal)
CardView cardView;
public NormalViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
cardView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if(v instanceof CardView) {
// use getAdapterPosition() instead of getLayoutPosition()
int itemPosition = getAdapterPosition();
removeItem(itemPosition);
}
}
}
我是这样做的,很简单:
只需为Clicked RecyclerView 位置添加1 行:
int position = getLayoutPosition()
ViewHolder类的完整代码:
private class ChildViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public TextView txtView;
public ChildViewHolder(View itemView) {
super(itemView);
imageView= (ImageView)itemView.findViewById(R.id.imageView);
txtView= (TextView) itemView.findViewById(R.id.txtView);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.i("RecyclerView Item Click Position", String.valueOf(getLayoutPosition()));
}
});
}
}
希望这会帮助你。
我使用此方法从 RecyclerView 启动 Intent:
@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
final MyClass myClass = mList.get(i);
viewHolder.txtViewTitle.setText(myclass.name);
...
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v){
Intent detailIntent = new Intent(mContext, type.class);
detailIntent.putExtra("MyClass", myclass);
mContext.startActivity(detailIntent);
}
}
);
RecyclerView 没有onItemClickListener
因为 RecyclerView 负责回收视图(惊喜!),所以回收视图的责任是处理它接收到的点击事件。
这实际上使它更易于使用,特别是如果您有可以在多个位置单击的项目。
无论如何,检测 RecyclerView 项目上的点击非常容易。 您需要做的就是定义一个接口(如果您不使用 Kotlin,在这种情况下您只需传入一个 lambda):
public class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {
private final Clicks clicks;
public MyAdapter(Clicks clicks) {
this.clicks = clicks;
}
private List<MyObject> items = Collections.emptyList();
public void updateData(List<MyObject> items) {
this.items = items;
notifyDataSetChanged(); // TODO: use ListAdapter for diffing instead if you need animations
}
public interface Clicks {
void onItemSelected(MyObject myObject, int position);
}
public class MyViewHolder extends RecyclerView.ViewHolder {
private MyObject myObject;
public MyViewHolder(View view) {
super(view);
// bind views
view.setOnClickListener((v) -> {
int adapterPosition = getAdapterPosition();
if(adapterPosition >= 0) {
clicks.onItemSelected(myObject, adapterPosition);
}
});
}
public void bind(MyObject myObject) {
this.myObject = myObject;
// bind data to views
}
}
}
Kotlin 中的相同代码:
class MyAdapter(val itemClicks: (MyObject, Int) -> Unit): RecyclerView.Adapter<MyViewHolder>() {
private var items: List<MyObject> = Collections.emptyList()
fun updateData(items: List<MyObject>) {
this.items = items
notifyDataSetChanged() // TODO: use ListAdapter for diffing instead if you need animations
}
inner class MyViewHolder(val myView: View): RecyclerView.ViewHolder(myView) {
private lateinit var myObject: MyObject
init {
// binds views
myView.onClick {
val adapterPosition = getAdapterPosition()
if(adapterPosition >= 0) {
itemClicks.invoke(myObject, adapterPosition)
}
}
}
fun bind(myObject: MyObject) {
this.myObject = myObject
// bind data to views
}
}
}
事情你不需要做:
1.) 你不需要手动拦截触摸事件
2.) 你不需要弄乱子附加状态更改侦听器
3.) 你不需要来自 RxJava 的 PublishSubject/PublishRelay
只需使用点击侦听器。
请参阅我的方法:
首先声明一个这样的接口:
/**
* Interface used for delegating item click events in a {@link android.support.v7.widget.RecyclerView}
* Created by Alex on 11/28/2015.
*/
public interface OnRecyclerItemClickListener<T> {
/**
* Called when a click occurred inside a recyclerView item view
* @param view that was clicked
* @param position of the clicked view
* @param item the concrete data that is displayed through the clicked view
*/
void onItemClick(View view, int position, T item);
}
然后创建适配器:
public class CustomRecyclerAdapter extends RecyclerView.Adapter {
private class InternalClickListener implements View.OnClickListener{
@Override
public void onClick(View v) {
if(mRecyclerView != null && mItemClickListener != null){
// find the position of the item that was clicked
int position = mRecyclerView.getChildAdapterPosition(v);
Data data = getItem(position);
// notify the main listener
mItemClickListener.onItemClick(v, position, data);
}
}
}
private final OnRecyclerItemClickListener mItemClickListener;
private RecyclerView mRecyclerView;
private InternalClickListener mInternalClickListener;
/**
*
* @param itemClickListener used to trigger an item click event
*/
public PlayerListRecyclerAdapter(OnRecyclerItemClickListener itemClickListener){
mItemClickListener = itemClickListener;
mInternalClickListener = new InternalClickListener();
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false);
v.setOnClickListener(mInternalClickListener);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
// do your binding here
}
@Override
public int getItemCount() {
return mDataSet.size();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
mRecyclerView = recyclerView;
}
@Override
public void onDetachedFromRecyclerView(RecyclerView recyclerView) {
super.onDetachedFromRecyclerView(recyclerView);
mRecyclerView = null;
}
public Data getItem(int position){
return mDataset.get(position);
}
}
现在让我们看看如何从片段中集成它:
public class TestFragment extends Fragment implements OnRecyclerItemClickListener<Data>{
private RecyclerView mRecyclerView;
@Override
public void onItemClick(View view, int position, Data item) {
// do something
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.test_fragment, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
mRecyclerView = view.findViewById(idOfTheRecycler);
mRecyclerView .setAdapter(new CustomRecyclerAdapter(this));
}
如果你想将 onClick() 添加到 item 的子视图中,例如 item 中的一个按钮,我发现你可以在你自己的 RecyclerView.Adapter 的 onCreateViewHolder() 中轻松完成,就像这样:
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater
.from(parent.getContext())
.inflate(R.layout.cell, null);
Button btn = (Button) v.findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//do it
}
});
return new MyViewHolder(v);
}
我不知道这是否是一个好方法,但它运作良好。 如果有人有更好的主意,很高兴告诉我并纠正我的答案! :)
如果您有一个 POJO 列表并希望从适配器外部单击检索一个,那么这里有一种很容易实现它的方法。
在您的适配器中,为单击事件创建一个侦听器和一个设置它的方法:
public class MyAdapter extends RecyclerView.Adapter<SitesListAdapter.ViewHolder> {
...
private List<MyPojo> mMyPojos;
private static OnItemClickListener mOnItemClickListener;
...
public interface OnItemClickListener {
public void onItemClick(MyPojo pojo);
}
...
public void setOnItemClickListener(OnItemClickListener onItemClickListener){
mOnItemClickListener = onItemClickListener;
}
...
}
在您的 ViewHolder 中,实现 onClickListener 并创建一个类成员来临时存储视图呈现的 POJO,这样(这是一个示例,创建一个 setter 会更好):
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public MyPojo mCurrentPojo;
...
public ViewHolder(View view) {
super(v);
...
view.setOnClickListener(this); //You could set this on part of the layout too
}
...
@Override
public void onClick(View view) {
if(mOnItemClickListener != null && mCurrentPojo != null){
mOnItemClickListener.onItemClick(mCurrentPojo);
}
}
回到您的适配器,在 ViewHolder 绑定时设置当前 POJO(如果当前视图没有,则设置为 null):
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
final MyPojo currentPojo = mMyPojos.get(position);
holder.mCurrentPojo = currentPojo;
...
就是这样,现在您可以从片段/活动中像这样使用它:
mMyAdapter.setOnItemClickListener(new mMyAdapter.OnItemClickListener() {
@Override
public void onItemClick(MyPojo pojo) {
//Do whatever you want with your pojo here
}
});
是的你可以
public ViewHolder onCreateViewHolder(ViewGroup parent,int viewType) {
//inflate the view
View view = LayoutInflator.from(parent.getContext()).inflate(R.layout.layoutID,null);
ViewHolder holder = new ViewHolder(view);
//here we can set onClicklistener
view.setOnClickListener(new View.OnClickListeener(){
public void onClick(View v)
{
//action
}
});
return holder;
这对我有用:
@Override
public void onBindViewHolder(PlacesListViewAdapter.ViewHolder holder, int position) {
----
----
----
// Set setOnClickListener(holder);
}
@Override
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
----
----
----
@Override
public void onClick(View view) {
// Use to get the item clicked getAdapterPosition()
}
}
在这里你可以处理多个 onclick 见下面的代码,它非常有效
public class RVNewsAdapter extends RecyclerView.Adapter<RVNewsAdapter.FeedHolder> {
private Context context;
List<News> newsList;
// Allows to remember the last item shown on screen
private int lastPosition = -1;
public RVNewsAdapter(List<News> newsList, Context context) {
this.newsList = newsList;
this.context = context;
}
public static class FeedHolder extends RecyclerView.ViewHolder implements OnClickListener {
ImageView img_main;
TextView tv_title;
Button bt_facebook, bt_twitter, bt_share, bt_comment;
public FeedHolder(View itemView) {
super(itemView);
img_main = (ImageView) itemView.findViewById(R.id.img_main);
tv_title = (TextView) itemView.findViewById(R.id.tv_title);
bt_facebook = (Button) itemView.findViewById(R.id.bt_facebook);
bt_twitter = (Button) itemView.findViewById(R.id.bt_twitter);
bt_share = (Button) itemView.findViewById(R.id.bt_share);
bt_comment = (Button) itemView.findViewById(R.id.bt_comment);
img_main.setOnClickListener(this);
bt_facebook.setOnClickListener(this);
bt_twitter.setOnClickListener(this);
bt_comment.setOnClickListener(this);
bt_share.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == bt_comment.getId()) {
Toast.makeText(v.getContext(), "Comment " , Toast.LENGTH_SHORT).show();
} else if (v.getId() == bt_facebook.getId()) {
Toast.makeText(v.getContext(), "Facebook " , Toast.LENGTH_SHORT).show();
} else if (v.getId() == bt_twitter.getId()) {
Toast.makeText(v.getContext(), "Twitter " , Toast.LENGTH_SHORT).show();
} else if (v.getId() == bt_share.getId()) {
Toast.makeText(v.getContext(), "share " , Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
}
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
@Override
public FeedHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.feed_row, parent, false);
FeedHolder feedHolder = new FeedHolder(view);
return feedHolder;
}
@Override
public void onBindViewHolder(FeedHolder holder, int position) {
holder.tv_title.setText(newsList.get(position).getTitle());
// Here you apply the animation when the view is bound
setAnimation(holder.img_main, position);
}
@Override
public int getItemCount() {
return newsList.size();
}
/**
* Here is the key method to apply the animation
*/
private void setAnimation(View viewToAnimate, int position) {
// If the bound view wasn't previously displayed on screen, it's animated
if (position > lastPosition) {
Animation animation = AnimationUtils.loadAnimation(context, android.R.anim.slide_in_left);
viewToAnimate.startAnimation(animation);
lastPosition = position;
}
}
}
修改了我的评论...
public class MyViewHolder extends RecyclerView.ViewHolder {
private Context mContext;
public MyViewHolder(View itemView) {
super(itemView);
mContext = itemView.getContext();
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int itemPosition = getLayoutPosition();
Toast.makeText(mContext, "" + itemPosition, Toast.LENGTH_SHORT).show();
}
});
}
检查这个我已经以正确的方式实现了所有事情的
RecyclerViewHolder 类
public class RecyclerViewHolder extends RecyclerView.ViewHolder {
//view holder is for girdview as we used in the listView
public ImageView imageView,imageView2;
public RecyclerViewHolder(View itemView) {
super(itemView);
this.imageView=(ImageView)itemView.findViewById(R.id.image);
}
}
适配器
public class RecyclerView_Adapter extends RecyclerView.Adapter<RecyclerViewHolder> {
//RecyclerView will extend to recayclerview Adapter
private ArrayList<ModelClass> arrayList;
private Context context;
private static RecyclerViewClickListener itemListener;
//constructor of the RecyclerView Adapter
RecyclerView_Adapter(Context context,ArrayList<ModelClass> arrayList,RecyclerViewClickListener itemListener){
this.context=context;
this.arrayList=arrayList;
this.itemListener=itemListener;
}
@Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//this method will inflate the custom layout and return as viewHolder
LayoutInflater layoutInflater=LayoutInflater.from(parent.getContext());
ViewGroup mainGroup=(ViewGroup) layoutInflater.inflate(R.layout.single_item,parent,false);
RecyclerViewHolder listHolder=new RecyclerViewHolder(mainGroup);
return listHolder;
}
@Override
public void onBindViewHolder(RecyclerViewHolder holder, final int position) {
final ModelClass modelClass=arrayList.get(position);
//holder
RecyclerViewHolder mainHolder=(RecyclerViewHolder)holder;
//convert the drawable image into bitmap
Bitmap image= BitmapFactory.decodeResource(context.getResources(),modelClass.getImage());
//set the image into imageView
mainHolder.imageView.setImageBitmap(image);
//to handle on click event when clicked on the recyclerview item and
// get it through the RecyclerViewHolder class we have defined the views there
mainHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//get the position of the image which is clicked
itemListener.recyclerViewListClicked(v,position);
}
});
}
@Override
public int getItemCount() {
return (null!=arrayList?arrayList.size():0);
}
}
界面
public interface RecyclerViewClickListener {
//this is method to handle the event when clicked on the image in Recyclerview
public void recyclerViewListClicked(View v,int position);
}
//and to call this method in activity
RecyclerView_Adapter adapter=new RecyclerView_Adapter(Wallpaper.this,arrayList,this);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
@Override
public void recyclerViewListClicked(View v,int position){
imageView.setImageResource(wallpaperImages[position]);
}
为您的RecyclerView
访问rowLayout(cell)
的mainView
,并在您的OnBindViewHolder
编写以下代码:
@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
Movie movie = moviesList.get(position);
holder.mainView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
System.out.println("pos " + position);
}
});
}
它对我有用。 希望它会有所帮助。 最简单的方法。
内部视图持有人
class GeneralViewHolder extends RecyclerView.ViewHolder {
View cachedView = null;
public GeneralViewHolder(View itemView) {
super(itemView);
cachedView = itemView;
}
OnBindViewHolder() 内部
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
final GeneralViewHolder generalViewHolder = (GeneralViewHolder) holder;
generalViewHolder.cachedView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "item Clicked at "+position, Toast.LENGTH_SHORT).show();
}
});
让我知道,您对此解决方案有任何疑问吗?
而不是在视图持有者内部实现接口 View.OnClickListener 或在您的活动中创建和接口并实现接口..我使用这个代码来简单地实现 OnClickListener 。
public static class SimpleStringRecyclerViewAdapter
extends RecyclerView.Adapter<SimpleStringRecyclerViewAdapter.ViewHolder> {
// Your initializations goes here...
private List<String> mValues;
public static class ViewHolder extends RecyclerView.ViewHolder {
//create a variable mView
public final View mView;
/*All your row widgets goes here
public final ImageView mImageView;
public final TextView mTextView;*/
public ViewHolder(View view) {
super(view);
//Initialize it here
mView = view;
/* your row widgets initializations goes here
mImageView = (ImageView) view.findViewById(R.id.avatar);
mTextView = (TextView) view.findViewById(android.R.id.text1);*/
}
}
public String getValueAt(int position) {
return mValues.get(position);
}
public SimpleStringRecyclerViewAdapter(Context context, List<String> items) {
mBackground = mTypedValue.resourceId;
mValues = items;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item, parent, false);
view.setBackgroundResource(mBackground);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.mBoundString = mValues.get(position);
holder.mTextView.setText(mValues.get(position));
//Here it is simply write onItemClick listener here
holder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Context context = v.getContext();
Intent intent = new Intent(context, ExampleActivity.class);
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return mValues.size();
}
}
@Layout(R.layout.item_view_1)
public class View1{
@View(R.id.txt)
public TextView txt;
@Resolve
public void onResolved() {
txt.setText(String.valueOf(System.currentTimeMillis() / 1000));
}
@Click(R.id.btn)
public void onClick(){
txt.setText(String.valueOf(System.currentTimeMillis() / 1000));
}
}
main_recyclerview.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e)
{
int position=rv.getChildAdapterPosition(rv.findChildViewUnder(e.getX(),e.getY()));
switch (position)
{
case 0:
{
wifi(position);
adapter2.notifyDataSetChanged();
}
break;
case 1:
{
sound(position);
adapter2.notifyDataSetChanged();
}
break;
case 2:
{
bluetooth(position);
adapter2.notifyDataSetChanged();
}
break;
}
return true;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e)
{
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
我写了一个库来处理 android recycler view item click 事件。 您可以在https://github.com/ChathuraHettiarachchi/RecycleClick 中找到整个教程
RecycleClick.addTo(YOUR_RECYCLEVIEW).setOnItemClickListener(new RecycleClick.OnItemClickListener() {
@Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
// YOUR CODE
}
});
或处理项目长按,您可以使用
RecycleClick.addTo(YOUR_RECYCLEVIEW).setOnItemLongClickListener(new RecycleClick.OnItemLongClickListener() {
@Override
public boolean onItemLongClicked(RecyclerView recyclerView, int position, View v) {
// YOUR CODE
return true;
}
});
recyclerview 动画没有测试过,其他都正常。 我认为它已被优化到最大。 接口还有其他用途,可以暂时忽略。
public abstract class BaseAdapterRV<VH extends BaseViewHolder> extends RecyclerView.Adapter<VH> implements AdapterInterface {
public final String TAG = getClass().getSimpleName();
protected final Activity mActivity;
protected final LayoutInflater mInflater;
protected ItemClickInterface<?, Integer> mListener;
public BaseAdapterRV(Activity activity) {
mActivity = activity;
mInflater = LayoutInflater.from(mActivity);
}
@Override
public final VH onCreateViewHolder(ViewGroup parent, int viewType) {
return onCreateViewHolder(parent, viewType, mInflater);
}
@Override
public final void onBindViewHolder(VH holder, int position) {
holder.itemView.setTag(R.id.tag_view_click, position);
//创建点击事件
holder.itemView.setOnClickListener(mListener);
holder.itemView.setOnLongClickListener(mListener);
onBindVH(holder, position);
}
///////////////////////////////////////////////////////////////////////////
// 以下是增加的方法
///////////////////////////////////////////////////////////////////////////
/**
* 注意!涉及到notifyItemInserted刷新时立即获取position可能会不正确
* 里面也有onItemLongClick
*/
public void setOnItemClickListener(ItemClickInterface<?, Integer> listener) {
mListener = listener;
notifyDataSetChanged();
}
@NonNull
protected abstract VH onCreateViewHolder(ViewGroup parent, int viewType, LayoutInflater inflater);
protected abstract void onBindVH(VH holder, int position);
}
这是界面
/**
* OnItemClickListener的接口
* 见子类实现{@link OnItemClickListener}{@link OnItemItemClickListener}
*/
public interface ItemClickInterface<DATA1, DATA2> extends View.OnClickListener, View.OnLongClickListener {
void onItemClick(DATA1 data1, DATA2 data2);
boolean onItemLongClick(DATA1 data1, DATA2 data2);
}
这是一个抽象类
public abstract class OnItemClickListener<DATA> implements ItemClickInterface<View, DATA> {
@Override
public void onClick(View v) {
onItemClick(v, (DATA) v.getTag(R.id.tag_view_click));
}
@Override
public boolean onLongClick(View v) {
return onItemLongClick(v, (DATA) v.getTag(R.id.tag_view_click));
}
@Override
public boolean onItemLongClick(View view, DATA data) {
return false;
}
}
你只需要它
mAdapter.setOnItemClickListener(new OnItemClickListener<Integer>() {
@Override
public void onItemClick(View view, Integer integer) {
}
@Override
public boolean onItemLongClick(View view, Integer integer) {
return true;
}
});
我找到了使用 androidx 生命周期可变实时数据的最短方法之一
适配器:
private val onItemClickListener = MutableLiveData<YourAdapterItem>()
override fun onBindViewHolder(holder: GifsViewHolder, position: Int) {
holder.itemView.setOnClickListener { onItemClickListener.value = gifs[position] }
}
fun getOnItemClickListener(): MutableLiveData<Gif> {
return onItemClickListener
}
在 MainActivity 中的任何位置
yourFancyAdapter.getOnItemClickListener().observe(this, Observer {
println(it)
})
带有getTag()/ setTag()和整个适配器的单击侦听器的示例:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
String[] mDataset = { "One", "Two", "Three" };
private final View.OnClickListener mClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
Object pos = v.getTag(R.id.TAG_POSITION);
if(pos instanceof Integer) {
// here is your position in the dataset that was clicked
int position = (Integer) pos;
...
}
}
};
class MyViewHolder extends RecyclerView.ViewHolder {
View mItemView;
TextView mTextView; // as example
...
MyViewHolder(View itemLayoutView){
super(itemLayoutView);
mItemView = itemLayoutView;
mTextView = itemLayoutView.findViewById(R.id.my_text_view_id);
....
itemLayoutView.setOnClickListener(mClickListener);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
// you could use getTag() here for to get previous position
// that used the holder and for example cancel prev async requests
// to load images for the old position or so.
//
// setTag() new position that use the holder, so then user
// will click on the itemView - you will be able to get
// the position by getTag()
holder.mItemView.setTag(R.id.TAG_POSITION, position);
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.mTextView.setText(mDataset[position]);
}
@Override
public @NonNull MyAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View item_layout = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_recyclerview_item_layout, parent, false);
....
return new MyViewHolder(item_layout);
}
@Override
public int getItemCount() {
return mDataset.length;
}
}
在tags.xml文件中定义的TAG_POSITION为
<?xml version="1.0" encoding="utf-8"?>
<resources>
<item name="TAG_POSITION" type="id"/>
</resources>
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