如何在Android的Activity中使用onItemLongClickListener？
我正在使用ItemClickSupport类，我想使用他们的长按听众，但我怎么知道它是否被点击很长？ 可悲的是我没有find任何使用这个例子。
ItemClickSupport.addTo(recyclerView3).setOnItemLongClickListener { recyclerView, position, v -> true }
我该如何检查是否属实？ 我如何获得被点击的位置？
ItemClickSupport.java：gist
/** * A class that adds item click support to a {@link RecyclerView}. * * @author Hugo Visser * @see * Getting your clicks on RecyclerView */ public class ItemClickSupport { private final RecyclerView recyclerView; private OnItemClickListener itemClickListener; private OnItemLongClickListener itemLongClickListener; private View.OnClickListener clickListener = new View.OnClickListener() { @Override public void onClick(View v) { if (itemClickListener != null) { final int position = recyclerView.getChildAdapterPosition(v); final long id = recyclerView.getChildItemId(v); itemClickListener.onItemClick(recyclerView, v, position, id); } } }; private View.OnLongClickListener longClickListener = new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { if (itemLongClickListener != null) { final int position = recyclerView.getChildAdapterPosition(v); final long id = recyclerView.getChildItemId(v); return itemLongClickListener.onItemLongClick(recyclerView, v, position, id); } return false; } }; private RecyclerView.OnChildAttachStateChangeListener attachListener = new RecyclerView.OnChildAttachStateChangeListener() { @Override public void onChildViewAttachedToWindow(View view) { if (itemClickListener != null) { view.setOnClickListener(clickListener); } if (itemLongClickListener != null) { view.setOnLongClickListener(longClickListener); } } @Override public void onChildViewDetachedFromWindow(View view) { if (itemClickListener != null) { view.setOnClickListener(null); } if (itemLongClickListener != null) { view.setOnLongClickListener(null); } } }; private ItemClickSupport(RecyclerView recyclerView) { this.recyclerView = recyclerView; } public static ItemClickSupport addTo(@NonNull RecyclerView view) { ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support); if (support == null) { support = new ItemClickSupport(view); support.attach(view); } else { Log.w("RecyclerView already has ItemClickSupport."); } return support; } private void attach(RecyclerView view) { view.setTag(R.id.item_click_support, this); view.addOnChildAttachStateChangeListener(attachListener); } public static ItemClickSupport removeFrom(@NonNull RecyclerView view) { ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support); if (support != null) { support.detach(view); } else { Log.w("RecyclerView does not have ItemClickSupport."); } return support; } private void detach(RecyclerView view) { view.removeOnChildAttachStateChangeListener(attachListener); view.setTag(R.id.item_click_support, null); itemClickListener = null; itemLongClickListener = null; } /** * @return The callback to be invoked when an item in the {@link RecyclerView} * has been clicked, or {@code null} if no callback has been set. */ public OnItemClickListener getOnItemClickListener() { return itemClickListener; } /** * Register a callback to be invoked when an item in the * {@link RecyclerView} has been clicked. * * @param listener callback that will be invoked */ public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) { itemClickListener = listener; return this; } /** * @return The callback to be invoked when an item in the {@link RecyclerView} * has been clicked and held, or {@code null} if no callback has been set. */ public OnItemLongClickListener getOnItemLongClickListener() { return itemLongClickListener; } /** * Register a callback to be invoked when an item in the * {@link RecyclerView} has been clicked and held. * * @param listener callback that will be invoked */ public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) { itemLongClickListener = listener; return this; } /** * Interface definition for a callback to be invoked when an item in the * {@link RecyclerView} has been clicked. */ public interface OnItemClickListener { /** * Callback method to be invoked when an item in the {@code RecyclerView} * has been clicked. * * @param parent {@code RecyclerView} where the click happened * @param view view within the {@code RecyclerView} that was clicked * @param position position of the view in the adapter * @param id row ID of the item that was clicked */ void onItemClick(RecyclerView parent, View view, int position, long id); } /** * Interface definition for a callback to be invoked when an item in the * {@link RecyclerView} has been clicked and held. */ public interface OnItemLongClickListener { /** * Callback method to be invoked when an item in the {@code RecyclerView} * has been clicked and held. * * @param parent {@code RecyclerView} where the click happened * @param view view within the {@code RecyclerView} that was clicked * @param position position of the view in the adapter * @param id row ID of the item that was clicked * @return {@code true} if the callback consumed the long click; {@code false} otherwise. */ boolean onItemLongClick(RecyclerView parent, View view, int position, long id); } }
在{recyclerView, position, v -> true} ， recyclerView, position, v是onItemLongClick回调的参数。 你会这样使用它：
ItemClickSupport.addTo(recyclerView3).setOnItemLongClickListener { recyclerView, view, position, id -> // Use position here true // False if not consumed }
编辑：
如果OnItemLongClickListener是一个Kotlin接口，你可以像这样使用它：
ItemClickSupport.addTo(recyclerView3).setOnItemLongClickListener(object: ItemClickSupport.OnItemLongClickListener { override fun onItemLongClick(parent: RecyclerView, view: View, position: Int, id: Long): Boolean { TODO("not implemented") } })