我用Android的RecyclerView做过几次物品列表，但这是一个相当复杂的过程。浏览众多在线教程中的一个作品(这个，这个，这个都很好)，但我正在寻找一个简单的示例，我可以复制和粘贴来快速启动和运行。只需要以下特性:
垂直布局 每行都有一个单一的TextView 响应点击事件
因为这个愿望我已经许过好几次了，所以我最终决定把答案写在下面，供我和你们将来参考。
当前回答
现在，您需要一个适配器来支持所有的RecyclerView
一个适配器可以用于所有的RecyclerView。NO onBindViewHolder, NO onCreateViewHolder处理。 没有从Java/Kotlin类设置适配器的代码。检查样本类。 您可以使用Binding Adapters为每个列表设置事件和自定义数据。
我在这里展示了通过1适配器设置两个不同的RecyclerView
activity_home.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="listOne"
type="java.util.List"/>
<variable
name="listTwo"
type="java.util.List"/>
<variable
name="onItemClickListenerOne"
type="com.ks.nestedrecyclerbindingexample.callbacks.OnItemClickListener"/>
<variable
name="onItemClickListenerTwo"
type="com.ks.nestedrecyclerbindingexample.callbacks.OnItemClickListener"/>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
rvItemLayout="@{@layout/row_one}"
rvList="@{listOne}"
rvOnItemClick="@{onItemClickListenerOne}"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
/>
<android.support.v7.widget.RecyclerView
rvItemLayout="@{@layout/row_two}"
rvList="@{listTwo}"
rvOnItemClick="@{onItemClickListenerTwo}"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
/>
</LinearLayout>
</layout>
你可以看到我传递列表，项目布局id和点击listener从布局。
rvItemLayout="@{@layout/row_one}"
rvList="@{listOne}"
rvOnItemClick="@{onItemClickListenerOne}"
该自定义属性由BindingAdapter创建。
public class BindingAdapters {
@BindingAdapter(value = {"rvItemLayout", "rvList", "rvOnItemClick"}, requireAll = false)
public static void setRvAdapter(RecyclerView recyclerView, int rvItemLayout, List rvList, @Nullable OnItemClickListener onItemClickListener) {
if (rvItemLayout != 0 && rvList != null && rvList.size() > 0)
recyclerView.setAdapter(new GeneralAdapter(rvItemLayout, rvList, onItemClickListener));
}
}
从Activity中，你传递list，点击listener like
HomeActivity.java
public class HomeActivity extends AppCompatActivity {
ActivityHomeBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.activity_home);
binding.setListOne(new ArrayList()); // pass your list or set list from response of API
binding.setListTwo(new ArrayList());
binding.setOnItemClickListenerOne(new OnItemClickListener() {
@Override
public void onItemClick(View view, Object object) {
if (object instanceof ModelParent) {
// TODO: your action here
}
}
});
binding.setOnItemClickListenerTwo(new OnItemClickListener() {
@Override
public void onItemClick(View view, Object object) {
if (object instanceof ModelChild) {
// TODO: your action here
}
}
});
}
}
你不想读太多，直接克隆/下载完整的例子从我的github回购。你自己试试。
你可以在上面的repo中看到GeneralAdapter.java。
如果您在设置数据绑定时遇到问题，请参阅此回答。
其他回答
首先，在Recycler视图中查看一些内容
回收器视图适配器可以是这样的。
class CustomAdapter: RecyclerView.Adapter<CustomAdapter.ViewHolder>() {
var data = listOf<String>()
set(value) {
field = value
notifyDataSetChanged()
}
override fun getItemCount() =data.size
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.txt.text= data[position]
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(
LayoutInflater.from(parent.context).inflate(R.layout.item_view, parent, false)
)
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView){
val txt: TextView = itemView.findViewById(R.id.item_text_view)
}
}
并将适配器附加到回收器视图，并将数据附加到适配器
val view = findViewById<RecyclerView>(R.id.recycler_view)
val adapter = CustomAdapter()
val data = listOf("text1", "text2", "text3")
adapter.data = data
view.layoutManager = LinearLayoutManager(this, RecyclerView.VERTICAL, false)
view.adapter = adapter
现在，您需要一个适配器来支持所有的RecyclerView
一个适配器可以用于所有的RecyclerView。NO onBindViewHolder, NO onCreateViewHolder处理。 没有从Java/Kotlin类设置适配器的代码。检查样本类。 您可以使用Binding Adapters为每个列表设置事件和自定义数据。
我在这里展示了通过1适配器设置两个不同的RecyclerView
activity_home.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="listOne"
type="java.util.List"/>
<variable
name="listTwo"
type="java.util.List"/>
<variable
name="onItemClickListenerOne"
type="com.ks.nestedrecyclerbindingexample.callbacks.OnItemClickListener"/>
<variable
name="onItemClickListenerTwo"
type="com.ks.nestedrecyclerbindingexample.callbacks.OnItemClickListener"/>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
rvItemLayout="@{@layout/row_one}"
rvList="@{listOne}"
rvOnItemClick="@{onItemClickListenerOne}"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
/>
<android.support.v7.widget.RecyclerView
rvItemLayout="@{@layout/row_two}"
rvList="@{listTwo}"
rvOnItemClick="@{onItemClickListenerTwo}"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
/>
</LinearLayout>
</layout>
你可以看到我传递列表，项目布局id和点击listener从布局。
rvItemLayout="@{@layout/row_one}"
rvList="@{listOne}"
rvOnItemClick="@{onItemClickListenerOne}"
该自定义属性由BindingAdapter创建。
public class BindingAdapters {
@BindingAdapter(value = {"rvItemLayout", "rvList", "rvOnItemClick"}, requireAll = false)
public static void setRvAdapter(RecyclerView recyclerView, int rvItemLayout, List rvList, @Nullable OnItemClickListener onItemClickListener) {
if (rvItemLayout != 0 && rvList != null && rvList.size() > 0)
recyclerView.setAdapter(new GeneralAdapter(rvItemLayout, rvList, onItemClickListener));
}
}
从Activity中，你传递list，点击listener like
HomeActivity.java
public class HomeActivity extends AppCompatActivity {
ActivityHomeBinding binding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.activity_home);
binding.setListOne(new ArrayList()); // pass your list or set list from response of API
binding.setListTwo(new ArrayList());
binding.setOnItemClickListenerOne(new OnItemClickListener() {
@Override
public void onItemClick(View view, Object object) {
if (object instanceof ModelParent) {
// TODO: your action here
}
}
});
binding.setOnItemClickListenerTwo(new OnItemClickListener() {
@Override
public void onItemClick(View view, Object object) {
if (object instanceof ModelChild) {
// TODO: your action here
}
}
});
}
}
你不想读太多，直接克隆/下载完整的例子从我的github回购。你自己试试。
你可以在上面的repo中看到GeneralAdapter.java。
如果您在设置数据绑定时遇到问题，请参阅此回答。
最小化回收器视图准备使用Kotlin模板:
垂直布局 每行都有一个单一的TextView 响应点击事件(Single和LongPress)
我知道这是一个旧的线程，所以在这里回答。添加以下答案以供将来参考:
在构建依赖项中添加回收视图
implementation 'com.google.android.material:material:1.4.0-alpha02'
// RecyclerView
implementation "androidx.recyclerview:recyclerview:1.2.0"
在布局中添加一个循环视图
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/wifiList"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
创建一个显示列表项的布局(list_item.xml)
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:padding="5dp"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="wrap_content">
<androidx.appcompat.widget.AppCompatTextView
android:id="@+id/ssid"
android:text="@string/app_name"
android:layout_width="match_parent"
android:textSize="17sp"
android:layout_height="wrap_content" />
</LinearLayout>
</androidx.cardview.widget.CardView>
现在创建一个最小的适配器来保存数据，这里的代码不言自明
class WifiAdapter(private val wifiList: ArrayList<ScanResult>) : RecyclerView.Adapter<WifiAdapter.ViewHolder>() {
// holder class to hold reference
inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
//get view reference
var ssid: TextView = view.findViewById(R.id.ssid) as TextView
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
// create view holder to hold reference
return ViewHolder( LayoutInflater.from(parent.context).inflate(R.layout.list_item, parent, false))
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
//set values
holder.ssid.text = wifiList[position].SSID
}
override fun getItemCount(): Int {
return wifiList.size
}
// update your data
fun updateData(scanResult: ArrayList<ScanResult>) {
wifiList.clear()
notifyDataSetChanged()
wifiList.addAll(scanResult)
notifyDataSetChanged()
}
}
添加这个类来处理列表项上的单点和长点事件
import android.content.Context;
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.OnItemTouchListener
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
public class RecyclerTouchListener implements RecyclerView.OnItemTouchListener {
public interface ClickListener {
void onClick(View view, int position);
void onLongClick(View view, RecyclerView recyclerView, int position);
}
private GestureDetector gestureDetector;
private ClickListener clickListener;
public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final ClickListener 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, 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) {
}
最后，将适配器设置为回收器视图，并添加触摸侦听器，以开始拦截单次或双击列表项的触摸事件
wifiAdapter = WifiAdapter(ArrayList())
wifiList.apply {
// vertical layout
layoutManager = LinearLayoutManager(applicationContext)
// set adapter
adapter = wifiAdapter
// Touch handling
wifiList.addOnItemTouchListener(RecyclerTouchListener(applicationContext, wifiList, object : RecyclerTouchListener.ClickListener {
override fun onClick(view: View?, position: Int) {
Toast.makeText(applicationContext, "RV OnCLickj " + position, Toast.LENGTH_SHORT).show()
}
override fun onLongClick(view: View, recyclerView: RecyclerView, position: Int) {
Toast.makeText(applicationContext, "RV OnLongCLickj " + position, Toast.LENGTH_SHORT).show()
}
}
))
}
奖励:更新数据
wifiAdapter.updateData(mScanResults as ArrayList<ScanResult>)
结果:
下面是一个类似下图的最小示例。
从一个空活动开始。您将执行以下任务来添加RecyclerView。您所需要做的就是复制并粘贴每个部分中的代码。稍后，您可以自定义它以满足您的需求。
向gradle添加依赖项 为活动和RecyclerView行添加xml布局文件 制作RecyclerView适配器 初始化活动中的RecyclerView
更新Gradle依赖项
确保以下依赖项在你的应用程序gradle中。构建文件:
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:recyclerview-v7:28.0.0'
您可以将版本号更新为最新的版本号。如果你还在使用Android Studio 2.x，请使用编译而不是实现。
创建活动布局
将RecyclerView添加到xml布局中。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/rvAnimals"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
创建行布局
我们的RecyclerView中的每一行都只会有一个单一的TextView。创建一个新的布局资源文件。
recyclerview_row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="10dp">
<TextView
android:id="@+id/tvAnimalName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"/>
</LinearLayout>
创建适配器
RecyclerView需要一个适配器来用您的数据填充每行中的视图。创建一个新的java文件。
MyRecyclerViewAdapter.java
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.ViewHolder> {
private List<String> mData;
private LayoutInflater mInflater;
private ItemClickListener mClickListener;
// data is passed into the constructor
MyRecyclerViewAdapter(Context context, List<String> data) {
this.mInflater = LayoutInflater.from(context);
this.mData = data;
}
// inflates the row layout from xml when needed
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = mInflater.inflate(R.layout.recyclerview_row, parent, false);
return new ViewHolder(view);
}
// binds the data to the TextView in each row
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
String animal = mData.get(position);
holder.myTextView.setText(animal);
}
// total number of rows
@Override
public int getItemCount() {
return mData.size();
}
// stores and recycles views as they are scrolled off screen
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView myTextView;
ViewHolder(View itemView) {
super(itemView);
myTextView = itemView.findViewById(R.id.tvAnimalName);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
}
}
// convenience method for getting data at click position
String getItem(int id) {
return mData.get(id);
}
// allows clicks events to be caught
void setClickListener(ItemClickListener itemClickListener) {
this.mClickListener = itemClickListener;
}
// parent activity will implement this method to respond to click events
public interface ItemClickListener {
void onItemClick(View view, int position);
}
}
笔记
虽然不是严格必要的，但我包含了监听行上的单击事件的功能。这在旧的listview中是可用的，是一种常见的需求。如果不需要，可以删除此代码。
在Activity中初始化RecyclerView
将以下代码添加到您的主活动中。
MainActivity.java
public class MainActivity extends AppCompatActivity implements MyRecyclerViewAdapter.ItemClickListener {
MyRecyclerViewAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// data to populate the RecyclerView with
ArrayList<String> animalNames = new ArrayList<>();
animalNames.add("Horse");
animalNames.add("Cow");
animalNames.add("Camel");
animalNames.add("Sheep");
animalNames.add("Goat");
// set up the RecyclerView
RecyclerView recyclerView = findViewById(R.id.rvAnimals);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new MyRecyclerViewAdapter(this, animalNames);
adapter.setClickListener(this);
recyclerView.setAdapter(adapter);
}
@Override
public void onItemClick(View view, int position) {
Toast.makeText(this, "You clicked " + adapter.getItem(position) + " on row number " + position, Toast.LENGTH_SHORT).show();
}
}
笔记
注意，该活动实现了我们在适配器中定义的ItemClickListener。这允许我们在onItemClick中处理行单击事件。
完成了
就是这样。您现在应该能够运行您的项目，并获得与顶部图像类似的内容。
发生了
在行之间添加分隔符
你可以像这样加一个简单的分隔符
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(),
layoutManager.getOrientation());
recyclerView.addItemDecoration(dividerItemDecoration);
如果你想要一些更复杂的东西，请参阅以下答案:
如何在RecyclerView中添加项目之间的分隔符和空格? 如何在线性布局中缩进分隔符(即，仅在ItemDecoration中添加填充，边距或插入)
在单击时更改行颜色
查看这个答案，了解如何更改背景颜色，并在单击一行时添加涟漪效应。
更新的行
有关如何添加、删除和更新行，请参阅此回答。
进一步的阅读
CodePath 视频教程 Android RecyclerView示例(stacktips教程) RecyclerView在Android:教程
首先添加recyclerview库。
implementation 'androidx.recyclerview:recyclerview:1.1.0'
创建模型类。
public class UserModel implements Serializable {
private String userName;
public UserModel(String userName) {
this.userName = userName;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
创建适配器类。
public class UsersAdapter extends RecyclerView.Adapter<UsersAdapter.UsersAdapterVh> implements Filterable {
private List<UserModel> userModelList;
private List<UserModel> getUserModelListFiltered;
private Context context;
private SelectedUser selectedUser;
public UsersAdapter(List<UserModel> userModelList,SelectedUser selectedUser) {
this.userModelList = userModelList;
this.getUserModelListFiltered = userModelList;
this.selectedUser = selectedUser;
}
@NonNull
@Override
public UsersAdapter.UsersAdapterVh onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
context = parent.getContext();
return new UsersAdapterVh(LayoutInflater.from(context).inflate(R.layout.row_users,null));
}
@Override
public void onBindViewHolder(@NonNull UsersAdapter.UsersAdapterVh holder, int position) {
UserModel userModel = userModelList.get(position);
String username = userModel.getUserName();
String prefix = userModel.getUserName().substring(0,1);
holder.tvUsername.setText(username);
holder.tvPrefix.setText(prefix);
}
@Override
public int getItemCount() {
return userModelList.size();
}
@Override
public Filter getFilter() {
Filter filter = new Filter() {
@Override
protected FilterResults performFiltering(CharSequence charSequence) {
FilterResults filterResults = new FilterResults();
if(charSequence == null | charSequence.length() == 0){
filterResults.count = getUserModelListFiltered.size();
filterResults.values = getUserModelListFiltered;
}else{
String searchChr = charSequence.toString().toLowerCase();
List<UserModel> resultData = new ArrayList<>();
for(UserModel userModel: getUserModelListFiltered){
if(userModel.getUserName().toLowerCase().contains(searchChr)){
resultData.add(userModel);
}
}
filterResults.count = resultData.size();
filterResults.values = resultData;
}
return filterResults;
}
@Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
userModelList = (List<UserModel>) filterResults.values;
notifyDataSetChanged();
}
};
return filter;
}
public interface SelectedUser{
void selectedUser(UserModel userModel);
}
public class UsersAdapterVh extends RecyclerView.ViewHolder {
TextView tvPrefix;
TextView tvUsername;
ImageView imIcon;
public UsersAdapterVh(@NonNull View itemView) {
super(itemView);
tvPrefix = itemView.findViewById(R.id.prefix);
tvUsername = itemView.findViewById(R.id.username);
imIcon = itemView.findViewById(R.id.imageView);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
selectedUser.selectedUser(userModelList.get(getAdapterPosition()));
}
});
}
}
}
创建布局row_uses.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:padding="10dp"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="50dp"
android:background="@drawable/users_bg"
android:layout_height="50dp">
<TextView
android:id="@+id/prefix"
android:layout_width="wrap_content"
android:textSize="16sp"
android:textColor="@color/headerColor"
android:text="T"
android:layout_centerInParent="true"
android:layout_height="wrap_content"/>
</RelativeLayout>
<TextView
android:id="@+id/username"
android:layout_width="wrap_content"
android:textSize="16sp"
android:textColor="@color/headerColor"
android:text="username"
android:layout_marginStart="90dp"
android:layout_centerVertical="true"
android:layout_height="wrap_content"/>
<ImageView
android:layout_width="wrap_content"
android:id="@+id/imageView"
android:layout_margin="10dp"
android:layout_alignParentEnd="true"
android:src="@drawable/ic_navigate_next_black_24dp"
android:layout_height="wrap_content"/>
</RelativeLayout>
</LinearLayout>
查找recyclerview并填充数据。
Toolbar toolbar;
RecyclerView recyclerView;
List<UserModel> userModelList = new ArrayList<>();
String[] names = {"Richard","Alice","Hannah","David"};
UsersAdapter usersAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recyclerview);
toolbar = findViewById(R.id.toolbar);
this.setSupportActionBar(toolbar);
this.getSupportActionBar().setTitle("");
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
for(String s:names){
UserModel userModel = new UserModel(s);
userModelList.add(userModel);
}
usersAdapter = new UsersAdapter(userModelList,this);
recyclerView.setAdapter(usersAdapter);
}
在这里找到完整的教程和源代码:
Android RecyclerView
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