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
这里有一个简单明了的方法是添加到您的ReacyclerView ViewHolder
public static class MyViewholder extends RecyclerView.ViewHolder {
public MyViewholder(View itemView) {
super(itemView);
itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.d("Tag", "onClick:" + getAdapterPosition());
}
});
}
}
getAdapterPosition()返回当前被单击项的位置
其他回答
Recyclerview适配器与kotlin
在适配器中可以通过两种方式实现项目点击监听器。
第一种方法是使用界面
在你的活动课上:
class YourActivity : AppCompatActivity(), TestAdapter.ClickListener {
...
override fun itemClicked() {
}
...
}
在适配器类中:
class MyAdapter : RecyclerView.Adapter<MyAdapter.MyViewHolder> {
...
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.textView1.setOnClickListener {
clickListener.itemClicked(position)
}
}
...
interface ClickListener {
fun itemClicked(position : Int)
}
...
}
第二种方法是使用callBack调用
在适配器类中:
class MyAdapter(val callBack: (pos:Int) -> Unit) : RecyclerView.Adapter<MyAdapter.MyViewHolder> {
...
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.textView1.setOnClickListener {
callBack(position)
}
}
}
在你的活动课上:
class YourActivity : AppCompatActivity() {
...
val testAdapter = TestAdapter(
callBack = { index ->
})
binding.recyclerView.layoutManager = LinearLayoutManager(this)
binding.recyclerView.adapter = testAdapter
...
}
我知道有很多答案,但我想我也可以提供我的实现。(完整的细节可以在我回答的另一个问题中找到)。
所以,要添加一个点击监听器,你的内部ViewHolder类需要实现View.OnClickListener。这是因为你将设置一个OnClickListener到ViewHolder的构造函数的itemView参数。让我来告诉你我的意思:
public class ExampleClickViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView text1, text2;
ExampleClickViewHolder(View itemView) {
super(itemView);
// we do this because we want to check when an item has been clicked:
itemView.setOnClickListener(this);
// now, like before, we assign our View variables
title = (TextView) itemView.findViewById(R.id.text1);
subtitle = (TextView) itemView.findViewById(R.id.text2);
}
@Override
public void onClick(View v) {
// The user may not set a click listener for list items, in which case our listener
// will be null, so we need to check for this
if (mOnEntryClickListener != null) {
mOnEntryClickListener.onEntryClick(v, getLayoutPosition());
}
}
}
唯一需要添加的其他东西是适配器的自定义接口和setter方法:
private OnEntryClickListener mOnEntryClickListener;
public interface OnEntryClickListener {
void onEntryClick(View view, int position);
}
public void setOnEntryClickListener(OnEntryClickListener onEntryClickListener) {
mOnEntryClickListener = onEntryClickListener;
}
这样,新的支持单击的适配器就完成了。
现在,让我们用它…
ExampleClickAdapter clickAdapter = new ExampleClickAdapter(yourObjects);
clickAdapter.setOnEntryClickListener(new ExampleClickAdapter.OnEntryClickListener() {
@Override
public void onEntryClick(View view, int position) {
// stuff that will happen when a list item is clicked
}
});
这基本上就是设置普通适配器的方法,除了使用您创建的setter方法来控制当用户单击特定列表项时要做什么。
你也可以看看我在GitHub上做的一组关于Gist的例子:
https://gist.github.com/FarbodSalamat-Zadeh/7646564f48ee708c1582c013e1de4f07
对我来说,最干净的方法就是这个。
适配器的构造函数
private class EnvironmentTypeRecyclerViewAdapter extends RecyclerView.Adapter<EnvironmentTypeRecyclerViewAdapter.ViewHolder>
{
private final EnvironmentTypeRecyclerViewAdapterListener mEnvironmentTypeRecyclerViewAdapterListener;
private List<Environment> mEnvironmentsData;
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
public ViewHolder(View v)
{
super(v);
v.setOnClickListener(this);
}
@Override
public void onClick(View v)
{
Environment environment = mEnvironmentsData.get(getAdapterPosition());
if (mEnvironmentTypeRecyclerViewAdapterListener != null && environment != null) {
mEnvironmentTypeRecyclerViewAdapterListener.onListItemSelected(environment);
}
}
public EnvironmentTypeRecyclerViewAdapter(List<SmallCellEnvironment> environments, EnvironmentTypeRecyclerViewAdapterListener environmentTypeRecyclerViewAdapterListener)
{
mEnvironmentTypeRecyclerViewAdapterListener = environmentTypeRecyclerViewAdapterListener;
mEnvironmentsData = environments;
}
}
链接接口
private interface EnvironmentTypeRecyclerViewAdapterListener
{
void onListItemSelected(Environment environment);
}
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);
}
}
步骤1)编写点击界面
创建一个名为RecyclerViewClickListener.java的接口,并添加以下代码。这里我们声明了两个方法onClick和onLongClick,分别用于标识项目单击和长单击。
package com.androidtutorialshub.recyclerviewtutorial.Helper;
import android.view.View;
public interface RecyclerViewClickListener {
void onClick(View view, int position);
void onLongClick(View view, int position);
}
步骤2)编写项目触摸类
创建一个名为RecyclerViewTouchListener.java的类,并添加以下代码。这里我们编写了检测点击和长按回收器视图项的逻辑。
package com.androidtutorialshub.recyclerviewtutorial.Helper;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
public class RecyclerViewTouchListener implements RecyclerView.OnItemTouchListener{
private GestureDetector gestureDetector;
private RecyclerViewClickListener clickListener;
public RecyclerViewTouchListener(Context context, final RecyclerView recyclerView, final RecyclerViewClickListener clickListener) {
this.clickListener = clickListener;
gestureDetector = 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 && clickListener != null) {
clickListener.onLongClick(child, recyclerView.getChildPosition(child));
}
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) {
clickListener.onClick(child, rv.getChildPosition(child));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
步骤3)定义点击监听器
打开MainActivity.java并更新以下更改。这里onClick()方法将检测点击项目,onLongClick将检测长时间点击项目。
recyclerView.addOnItemTouchListener(new RecyclerViewTouchListener(getApplicationContext(), recyclerView, new RecyclerViewClickListener() {
@Override
public void onClick(View view, int position) {
Toast.makeText(getApplicationContext(), bookList.get(position).getTitle() + " is clicked!", Toast.LENGTH_SHORT).show();
}
@Override
public void onLongClick(View view, int position) {
Toast.makeText(getApplicationContext(), bookList.get(position).getTitle() + " is long pressed!", Toast.LENGTH_SHORT).show();
}
}));
欲了解更多信息或下载源代码:http://www.androidtutorialshub.com/android-recyclerview-click-listener-tutorial/
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