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
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){}
}
其他回答
有更简单的方法。只需要在根视图上应用onBindViewHolder中的click。
考虑这是你对适配器的看法,
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="@+id/linearlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:id="@+id/textview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="1dp"
android:textSize="15sp" />
</LinearLayout>
然后在适配器中执行以下操作
//get the layout and make view holder
@Override
public RVAdapter.ViewHolder1 onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_layout, null);
ViewHolder1 viewHolder = new ViewHolder1(view);
return viewHolder;
}
@Override
public void onBindViewHolder(RVAdapter.ViewHolder1 holder, int position) {
//apply on click on your root view
holder.linearlayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Do on click stuff
}
});
}
//make references to views in layout including root view
public class ViewHolder1 extends RecyclerView.ViewHolder {
protected LinearLayout linearlayout = null
protected TextView textview = null;
public CareerLinksViewHolder(View itemView) {
super(itemView);
this.linearlayout = (LinearLayout) itemView.findViewById(R.id.linearlayout);
this.tvCompName = (TextView) itemView.findViewById(R.id.textview);
}
}
对于kotlin句柄,根据Jacobs的回答单击RecyclerView答案
创建类RecyclerItemClickListener:
class RecyclerItemClickListener(context: Context, recyclerView: RecyclerView, listner: OnItemClickListener) : RecyclerView.OnItemTouchListener {
var mGestureDetector: GestureDetector
var mListner: OnItemClickListener
interface OnItemClickListener {
fun onItemClick(view: View, position: Int)
fun onLongItemClick(view: View, position: Int)
}
init {
this.mListner = listner
mGestureDetector = GestureDetector(context, object : GestureDetector.SimpleOnGestureListener() {
override fun onSingleTapUp(e: MotionEvent?): Boolean = true
override fun onLongPress(e: MotionEvent?) {
val child: View? = recyclerView.findChildViewUnder(e!!.getX(), e.getY())
if (child != null && mListner != null) {
mListner.onLongItemClick(child, recyclerView.getChildAdapterPosition(child))
}
}
})
}
override fun onTouchEvent(rv: RecyclerView, e: MotionEvent) = Unit
override fun onInterceptTouchEvent(view: RecyclerView, e: MotionEvent): Boolean {
val childView: View? = view.findChildViewUnder(e!!.getX(), e.getY())
if (childView != null && mListner != null && mGestureDetector.onTouchEvent(e)) {
mListner.onItemClick(childView, view.getChildAdapterPosition(childView))
return true
}
return false
}
override fun onRequestDisallowInterceptTouchEvent(disallowIntercept: Boolean) = Unit
}
点击Any RecyclerView(在活动/片段内):
recyclerView.addOnItemTouchListener(
RecyclerItemClickListener(this, recyclerView, object : RecyclerItemClickListener.OnItemClickListener {
override fun onItemClick(view: View, position: Int) {
// TODO catch click
}
override fun onLongItemClick(view: View, position: Int) {
// TODO catch click
}
})
)
如果你想在个别项目上捕捉点击事件,那么只需在ViewHolder类中实现OnClickListener,然后在个别视图或整个itemView上设置点击侦听器。
下面的例子说明了同样的情况
public class ContactViewHolder extends RecyclerView.ViewHolder implements OnClickListener
{
TextView txt_title,txt_name,txt_email;
public ContactViewHolder(View itemView)
{
super(itemView);
txt_title = (TextView)itemView.findViewById(R.id.txt_title);
txt_name = (TextView)itemView.findViewById(R.id.txt_name);
txt_email = (TextView)itemView.findViewById(R.id.txt_email);
txt_name.setOnClickListener(this);
txt_email.setOnClickListener(this);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(v == itemView)
{
Toast.makeText(RecyclerDemoActivity.this, "Visiting Card Clicked is ==>"+txt_name.getText(), Toast.LENGTH_SHORT).show();
}
if(v == txt_name)
{
Toast.makeText(RecyclerDemoActivity.this, "Name ==>"+txt_name.getText(), Toast.LENGTH_SHORT).show();
}
if(v == txt_email)
{
Toast.makeText(RecyclerDemoActivity.this, "Email ==>"+txt_email.getText(), Toast.LENGTH_SHORT).show();
}
}
}
}
RecyclerView没有OnClickListener,必须自己实现它。
我喜欢在适配器中添加OnItemClickListener接口,当您从ViewHolder中单击项目视图时调用onClick方法。因此,管理项目点击的职责不在ViewHolder和Adapter的范围内。将决定做什么的活动或片段
为监听器和监听器对象添加接口。
public class ItemsAdapter extends RecyclerView.Adapter<ItemsAdapter.ViewHolder> {
...
private static OnItemClickListener onItemClickListener;
...
public static interface OnItemClickListener {
public void onItemClick(View view, int position);
}
...
}
我们捕获项目根视图的单击,以及当回调触发时适配器上的onClick侦听器调用。
public class ItemsAdapter extends RecyclerView.Adapter<ItemsAdapter.ViewHolder> {
...
private static OnItemClickListener onItemClickListener;
...
public static interface OnItemClickListener {
public void onItemClick(View view, int position);
}
...
public static class ViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public ViewHolder(View itemRootView) {
super(itemRootView);
imageView = (ImageView) itemRootView.findViewById(R.id.itemImage);
itemRootView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int position = ViewHolder.super.getAdapterPosition();
onItemClickListener.onItemClick(view,position);
}
});
}
}
}
由于活动或片段,片段在我们的情况下,我们分配一个监听器到适配器和onClick回调,我们将获得选定的项目的位置和打开一个详细的活动项目。
public class ItemsFragment extends Fragment {
...
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
...
((ItemsAdapter) adapter).setOnItemClickListener(new ItemsAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
//Do something when an item has been clicked
}
});
...
}
...
}
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);
}
}
}
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