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
我有一个很好的解决方案RecyclerView的onItemClickListener的项目和子项
步骤1—创建接口
public interface OnRecyclerViewItemClickListener
{
/**
* Called when any item with in recyclerview or any item with in item
* clicked
*
* @param position
* The position of the item
* @param id
* The id of the view which is clicked with in the item or
* -1 if the item itself clicked
*/
public void onRecyclerViewItemClicked(int position, int id);
}
步骤2-然后在适配器的onBindViewHolder方法中使用它,如下所示
/**
* Custom created method for Setting the item click listener for the items and items with in items
* @param listener OnRecyclerViewItemClickListener
*/
public void setOnItemClickListener(OnRecyclerViewItemClickListener listener)
{
this.listener = listener;
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, final int position)
{
// viewHolder.albumBg.setBackgroundResource(_itemData[position]
// .getImageUrl());
viewHolder.albumName.setText(arrayList.get(position).getName());
viewHolder.artistName.setText(arrayList.get(position).getArtistName());
String imgUrl = arrayList.get(position).getThumbImageUrl();
makeImageRequest(imgUrl, viewHolder);
viewHolder.parentView.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
listener.onRecyclerViewItemClicked(position, -1);
}
});
viewHolder.settingButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v)
{
listener.onRecyclerViewItemClicked(position, v.getId());
}
});
}
// class to hold a reference to each item of RecyclerView
public static class ViewHolder extends RecyclerView.ViewHolder
{
public TextView albumName, artistName;
public ImageView albumIcon, settingButton;
public LinearLayout parentView;
public ViewHolder(View itemLayoutView)
{
super(itemLayoutView);
// albumBg = (LinearLayout) itemLayoutView
// .findViewById(R.id.albumDlbg);
albumName = (TextView) itemLayoutView.findViewById(R.id.albumName);
artistName = (TextView) itemLayoutView
.findViewById(R.id.artistName);
albumIcon = (ImageView) itemLayoutView.findViewById(R.id.albumIcon);
parentView = (LinearLayout) itemLayoutView
.findViewById(R.id.albumDlbg);
settingButton = (ImageView) itemLayoutView
.findViewById(R.id.settingBtn);
}
}
步骤3-在活动或片段中找到并设置回收器视图,您正在使用此
recyclerView = (RecyclerView) rootview.findViewById(R.id.vmtopsongs);
lm = new LinearLayoutManager(mActivity);
lm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(lm);
recyclerView.addItemDecoration(
new HorizontalDividerItemDecoration.Builder(getActivity())
.paint(Utils.getPaint()).build());
PopularSongsadapter mAdapter = new PopularSongsadapter(gallery,
mActivity, true);
// set adapter
recyclerView.setAdapter(mAdapter);
mAdapter.setOnItemClickListener(this);
// set item animator to DefaultAnimator
recyclerView.setItemAnimator(new DefaultItemAnimator());
步骤4-最后在使用recyclerview的activity或fragment中实现接口
@Override
public void onRecyclerViewItemClicked(int position, int id)
{
if(id==-1){
Toast.makeText(mActivity, "complete item clicked", Toast.LENGTH_LONG).show();
}else{
Toast.makeText(mActivity, "setting button clicked", Toast.LENGTH_LONG).show();
}
}
更新Kotlin语言 我已经更新了kotlin的代码,其中只有整个视图有点击监听器。你可以根据上面的java代码编辑界面和代码来设置子项点击监听器。
适配器
class RecentPostsAdapter(private val list: MutableList<Post>) :
RecyclerView.Adapter<RecentPostsAdapter.ViewHolder>() {
private lateinit var onItemClickListener: OnItemClickListener
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(
LayoutInflater.from(parent.context)
.inflate(R.layout.listitem_recent_post, parent, false)
)
}
override fun getItemCount(): Int {
return list.size
}
fun setOnItemClickListener(onItemClickListener: OnItemClickListener) {
this.onItemClickListener = onItemClickListener
}
private fun getItem(position: Int): Post {
return list[position]
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.bind(getItem(position))
holder.itemView.setOnClickListener(View.OnClickListener {
onItemClickListener.onItemClick(
position
)
})
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
private var imageView: NetworkImageView? = null
private var tvTitle: TextView? = null
private var tvExcerpt: TextView? = null
private var htmlSpanner: HtmlSpanner = HtmlSpanner()
init {
imageView = itemView.findViewById(R.id.niv_post_image)
tvTitle = itemView.findViewById(R.id.tv_post_title)
tvExcerpt = itemView.findViewById(R.id.tv_post_excerpt)
}
fun bind(post: Post) {
tvTitle?.text = post.title
tvExcerpt?.text = htmlSpanner.fromHtml(post.excerpt)
}
}
interface OnItemClickListener {
fun onItemClick(position: Int)
}
}
活动或片段
recyclerView = view.findViewById(R.id.rvHomeRecentPosts)
recyclerView.layoutManager = LinearLayoutManager(view.context)
list = mutableListOf()
recentPostsAdapter = RecentPostsAdapter(list)
recyclerView.adapter = recentPostsAdapter
recentPostsAdapter.setOnItemClickListener(object:RecentPostsAdapter.OnItemClickListener{
override fun onItemClick(position: Int) {
(activity as MainActivity).findNavController(R.id.nav_host_fragment).navigate(R.id.action_nav_home_to_nav_post_detail)
}
})
其他回答
这就是重用View的方法。OnClickListener:
public class TestAdapter extends RecyclerView.Adapter<TestAdapter.MyviewHolder>
implements View.OnClickListener
在ViewHoder中获取项目布局的父视图:
public class MyviewHolder extends RecyclerView.ViewHolder {
LinearLayout linearLayout;
public MyviewHolder(View itemView) {
super(itemView);
linearLayout = itemView.findViewById(R.id.linear_layout_item);
}
}
在onBindViewHolder中设置标签为位置:
@Override
public void onBindViewHolder(MyviewHolder holder, int position) {
holder.linearLayout.setTag(position);
holder.linearLayout.setOnClickListener(this);
}
在你的onClick实现中:
@Override
public void onClick(View v) {
int position = (int) v.getTag();
switch (v.getId()) {
case R.id.linear_layout_item:
// do some thing with position
break;
}
}
我们可以使用Java弱引用来实现这一点。 从语义上讲,视图持有者应该响应click事件或将其委托给正确的响应器。
我们的目标:
Viewholder应该对响应事件的类一无所知,除非它实现了某个接口。 点击处理程序应该得到被点击的视图在RecyclerView中的位置。 我们应该能够辨别视图持有人中单击了哪个视图。 保持所有组件之间的松散耦合,不要造成任何保留周期。
步骤:
Create an interface to handle click responses. Implement this interface in the Activity that will handle the click. Add a member variable in the RecyclerView Adapter to hold the Weak Reference and a constructor that sets it. Do the same in the RecyclerView ViewHolder and add a member variable to keep track of position. Set your on click listeners on any view you'd like in the ViewHolder, then callback to the responder to handle them. Change your onBindViewHolder method to set the position when binding. Pass the responder down to the ViewHolder. In the responder, you can now use getId() on the view to figure out which view was clicked.
这里是一个要点,这样你就可以看到它们是如何组合在一起的: RecyclerView点击处理
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
}
我的方式
活动课上:
public class MyActivity extends AppCompatActivity implements EmployeeAdapter.ClickListener {
...
@Override
public void onClick(int position) { ... }
...
}
适配器类:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
...
@Override
public void onBindViewHolder(){
holder.textView1.setOnClickListener(v -> clickListener.onClick(position));
}
...
public interface ClickListener {
void onClick(int position);
}
...
}
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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