有人使用RecyclerView找到了一种方法来设置一个onClickListener的项目在RecyclerView? 我想设置一个监听器为每个项目的布局,但这似乎有点太麻烦了 我确信有一种方法让RecyclerView监听onClick事件,但我不能完全弄清楚。
当前回答
根据Yigit Boyar的说法,在RecyclerView上注册点击的最好方法是在ViewHolder的创建中定义点击,而不是仅仅为onBindViewHolder绑定的每个项目创建一个新的onClickListener
例子:
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder<*> {
val itemBinding = LayoutInflater.from(context).inflate(R.layout.my_layout, parent, false)
val vh = MainViewHolder (itemBinding)
vh.itemView.setOnClickListener {
val pos = vh.adapterPosition
if(pos != NO_POSITION){
itemClickLister.onCocktailClick(myList[pos],pos)
}
}
return vh
}
其他回答
将类标记为抽象并实现OnClick方法
public abstract class MainGridAdapter extends
RecyclerView.Adapter<MainGridAdapter.ViewHolder> {
private List<MainListItem> mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView txtHeader;
public TextView txtFooter;
public ViewHolder(View v) {
super(v);
txtHeader = (TextView) v.findViewById(R.id.firstLine);
txtFooter = (TextView) v.findViewById(R.id.secondLine);
}
}
public void add(int position, MainListItem item) {
mDataset.add(position, item);
notifyItemInserted(position);
}
public void remove(MainListItem item) {
int position = mDataset.indexOf(item);
mDataset.remove(position);
notifyItemRemoved(position);
}
// Provide a suitable constructor (depends on the kind of dataset)
public MainGridAdapter(List<MainListItem> myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
@Override
public MainGridAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(
R.layout.list_item_grid_line, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
OnClickListener clickListener = new OnClickListener() {
@Override
public void onClick(View v) {
onItemClicked(position);
}
};
holder.itemView.setOnClickListener(clickListener);
holder.txtHeader.setOnClickListener(clickListener);
holder.txtFooter.setOnClickListener(clickListener);
final MainListItem item = mDataset.get(position);
holder.txtHeader.setText(item.getTitle());
if (TextUtils.isEmpty(item.getDescription())) {
holder.txtFooter.setVisibility(View.GONE);
} else {
holder.txtFooter.setVisibility(View.VISIBLE);
holder.txtFooter.setText(item.getDescription());
}
}
// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
return mDataset.size();
}
public abstract void onItemClicked(int position);
}
在绑定事件中实现单击处理程序,使其只有一个事件实现
执行此:
mAdapter = new MainGridAdapter(listItems) {
@Override
public void onItemClicked(int position) {
showToast("Item Clicked: " + position, ToastPlus.STYLE_INFO);
}
};
同样可以做长时间点击
这是我所做的阅读更多和下载要点在这里
在这里添加相同的内容
CustomItemClickListener.java
public interface CustomItemClickListener {
public void onItemClick(View v, int position);
}
ItemsListAdapter.java
public class ItemsListAdapter extends RecyclerView.Adapter<ItemsListAdapter.ViewHolder> {
ArrayList<ItemListSingleItem> data;
Context mContext;
CustomItemClickListener listener;
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View mView = LayoutInflater.from(parent.getContext()).inflate(R.layout.items_list_single_item, parent, false);
final ViewHolder mViewHolder = new ViewHolder(mView);
mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
listener.onItemClick(v, mViewHolder.getAdapterPosition());
}
});
return mViewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.itemTitle.setText(Html.fromHtml(data.get(position).getTitle()));
if (!TextUtils.isEmpty(data.get(position).getThumbnailURL())) {
// I Love picasso library :) http://square.github.io/picasso/
Picasso.with(mContext).load(data.get(position).getThumbnailURL()).error(R.drawable.ic_no_image).
placeholder(R.drawable.ic_no_image).
transform(new RoundedCornersTransformation(5, 0)).
into(holder.thumbnailImage);
} else {
holder.thumbnailImage.setImageResource(R.drawable.ic_no_image);
}
}
@Override
public int getItemCount() {
return data.size();
}
public ItemsListAdapter(Context mContext, ArrayList<ItemsListSingleItem> data, CustomItemClickListener listener) {
this.data = data;
this.mContext = mContext;
this.listener = listener;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView itemTitle;
public ImageView thumbnailImage;
ViewHolder(View v) {
super(v);
itemTitle = (TextView) v
.findViewById(R.id.post_title);
thumbnailImage = (ImageView) v.findViewById(R.id.post_thumb_image);
}
}
}
你可以实现View。OnClickListener到你的ViewHolder类
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public Item item
@InjectView(R.id.tv_title)
public TextView tvTitle;
@InjectView(R.id.rl_row)
public RelativeLayout rlRow;
public ViewHolder(View v) {
super(v);
ButterKnife.inject(this, v);
v.setOnClickListener(this);
}
@Override
public void onClick(View view) {
Log.e("item title",item.getTitle());
}
}
和onBindViewHolder设置你的视图持有人的项目:
public void onBindViewHolder(ViewHolder holder, int position) {
holder.tvTitle.setText(objects.get(position).getTitle());
holder.item = objects.get(position);
}
这里有一个更好的和不那么紧密耦合的方式来实现一个OnClickListener的RecyclerView。
用法片段:
RecyclerView recyclerView = findViewById(R.id.recycler);
recyclerView.addOnItemTouchListener(
new RecyclerItemClickListener(context, recyclerView ,new RecyclerItemClickListener.OnItemClickListener() {
@Override public void onItemClick(View view, int position) {
// do whatever
}
@Override public void onLongItemClick(View view, int position) {
// do whatever
}
})
);
RecyclerItemClickListener实现:
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
private OnItemClickListener mListener;
public interface OnItemClickListener {
public void onItemClick(View view, int position);
public void onLongItemClick(View view, int position);
}
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) {
return true;
}
@Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && mListener != null) {
mListener.onLongItemClick(child, recyclerView.getChildAdapterPosition(child));
}
}
});
}
@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 true;
}
return false;
}
@Override public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) { }
@Override
public void onRequestDisallowInterceptTouchEvent (boolean disallowIntercept){}
}
对我来说,这是最好的方法:
class YourRecyclerAdapter extends RecyclerView.Adapter<ContactViewHolder> implements View.OnClickListener {
...
@Override
public void onClick(View view) {
int itemPosition = vRecycle.getChildPosition(view);
//And use itemPosition to get the item from your collection. This way you dont restrain the ViewHolder with a OnClick callback
}
...
}
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