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
由于我还不能评论，我将发布一个链接的答案..我在recyclerview上找到了一个简单、组织良好的教程 http://www.androiddeft.com/2017/10/01/recyclerview-android/
除此之外，当你要在你的活动中添加一个回收器视图时，你想做的事情如下所示，你应该如何做，已经在链接中描述了
将RecyclerView组件添加到布局文件中 创建一个要显示为列表行的类 制作一个布局文件，这是你列表中的一行的布局 现在我们需要一个自定义适配器，因此通过扩展来创建一个自定义适配器 从父类RecyclerView。适配器 在mainActivity oncreate中添加recyclerview 添加分隔符 添加Touch监听器
其他回答
这里有一个更新的Kotlin解决方案，它比这里写的许多答案要简单得多，它使用匿名类。
val items = mutableListOf<String>()
inner class ItemHolder(view: View): RecyclerView.ViewHolder(view) {
var textField: TextView = view.findViewById(android.R.id.text1) as TextView
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
rvitems.layoutManager = LinearLayoutManager(context)
rvitems.adapter = object : RecyclerView.Adapter<ItemHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ItemHolder {
return ItemHolder(LayoutInflater.from(parent.context).inflate(android.R.layout.simple_list_item_1, parent, false))
}
override fun getItemCount(): Int {
return items.size
}
override fun onBindViewHolder(holder: ItemHolder, position: Int) {
holder.textField.text = items[position]
holder.textField.setOnClickListener {
Toast.makeText(context, "Clicked $position", Toast.LENGTH_SHORT).show()
}
}
}
}
我擅自使用了android.R.layout。Simple_list_item_1因为它更简单。我想进一步简化它，并将ItemHolder作为一个内部类，但不太清楚如何在外部类参数的类型中引用它。
依赖关系
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support:design:25.3.1'
compile 'com.android.support:multidex:1.0.1'
compile 'com.android.support:cardview-v7:25.3.1'
compile 'com.android.support:support-v4:25.3.1'
compile 'com.lguipeng.bubbleview:library:1.0.0'
compile 'com.larswerkman:HoloColorPicker:1.5'
compile 'com.mcxiaoke.volley:library-aar:1.0.0'
一个类为点击项目
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);
}
GestureDetector mGestureDetector;
public RecyclerItemClickListener(Context context, OnItemClickListener listener) {
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
}
@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.getChildPosition(childView));
return true;
}
return false;
}
@Override
public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) { }
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
第二个类RecyclerView
import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.content.LocalBroadcastManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.android.volley.DefaultRetryPolicy;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class SLByTopics extends Fragment {
public static ArrayList<MByTopics> byTopicsMainArrayList=new ArrayList<>();
TabRefreshReceiver tabRefreshReceiver;
RecyclerView recyclerView;
SAdpByTopics sAdpByTopics;
public ArrayList<MByTopics> mByTopicsArrayList=new ArrayList<>();
ProgressDialog progressDialog;
public SLByTopics(){
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.sl_fragment_by_topics, container, false);
progressDialog = new ProgressDialog(getActivity());
if (IsOnline.isNetworkAvailable(getActivity())) {
getCategoryTree();
} else{
IsOnline.showNoInterNetMessage(getActivity());
}
tabRefreshReceiver = new TabRefreshReceiver();
LocalBroadcastManager.getInstance(getContext()).registerReceiver(tabRefreshReceiver, new IntentFilter("BY_TOPICS"));
setUpView(view);
return view;
}
private void setUpView(View view) {
recyclerView=(RecyclerView)view.findViewById(R.id.by_topics_list_recyclerView);
LinearLayoutManager linearLayoutManager=new LinearLayoutManager(getActivity());
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(linearLayoutManager);
}
@Override
public void onResume() {
super.onResume();
recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getActivity(), new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, final int position) {
if (mByTopicsArrayList.get(position).getChild().size()>0){
Intent intent = new Intent(getActivity(), SByTopicCategory.class);
intent.putExtra("selectedCategoryName",mByTopicsArrayList.get(position).getCatname());
intent.putExtra("jsonData",mByTopicsArrayList.get(position).getMainTopicJson());
startActivity(intent);
getActivity().overridePendingTransition(R.anim.activity_in, R.anim.activity_out);
}else {
Intent intent = new Intent(getActivity(), SByCategoryQuestionList.class);
intent.putExtra("selectedSubCategoryName",mByTopicsArrayList.get(position).getCatname());
intent.putExtra("catID",mByTopicsArrayList.get(position).getId());
startActivity(intent);
getActivity().overridePendingTransition(R.anim.activity_in, R.anim.activity_out);
}
}
}));
}
private class TabRefreshReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
try {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.detach(SLByTopics.this).attach(SLByTopics.this).commit();
LocalBroadcastManager.getInstance(getContext()).unregisterReceiver(tabRefreshReceiver);
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void getCategoryTree() {
progressDialog.setMessage("Please Wait...");
progressDialog.setCancelable(false);
progressDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.POST, Const.HOSTNAME + Const.STUDENT_GET_CATEGORY_TREE,
new Response.Listener<String>() {
@SuppressLint("LongLogTag")
@Override
public void onResponse(String response) {
try {
JSONObject object = new JSONObject(response);
String status = object.getString("status");
int i = Integer.parseInt(status);
switch (i) {
case 0:
progressDialog.dismiss();
// Toast.makeText(getActivity(), "getCategorySuccess", Toast.LENGTH_SHORT).show();
Log.e("getCategoryTree Response", "getCategoryTree Response : " + response);
try {
byTopicsMainArrayList.clear();
JSONArray info = object.getJSONArray("info");
if (info.length() > 0) {
for (i = 0; i < info.length(); i++) {
JSONObject data = info.getJSONObject(i);
MByTopics mByTopics = new MByTopics();
mByTopics.setId(data.getString("id"));
mByTopics.setCatname(data.getString("catname"));
mByTopics.setMainTopicJson(data.toString());
JSONArray topicChildren = data.getJSONArray("children");
ArrayList<SMByTopicCategory> byChildrenArrayList = new ArrayList<>();
for (int j = 0; j < topicChildren.length(); j++) {
JSONObject topicChildrenData = topicChildren.getJSONObject(j);
SMByTopicCategory smByTopicCategory = new SMByTopicCategory();
smByTopicCategory.setId(topicChildrenData.getString("id"));
smByTopicCategory.setCatname(topicChildrenData.getString("catname"));
smByTopicCategory.setChildTopicJson(topicChildrenData.toString());
JSONArray topicChildrenQuestion = topicChildrenData.getJSONArray("children");
ArrayList<SMByTopicSubCategory> byChildrenSubArrayList = new ArrayList<>();
for (int k = 0; k < topicChildrenQuestion.length(); k++) {
JSONObject topicChildrenSubData = topicChildrenQuestion.getJSONObject(k);
SMByTopicSubCategory smByTopicSubCategory = new SMByTopicSubCategory();
smByTopicSubCategory.setId(topicChildrenSubData.getString("id"));
smByTopicSubCategory.setCatname(topicChildrenSubData.getString("catname"));
smByTopicSubCategory.setChildSubTopicJson(topicChildrenSubData.toString());
byChildrenSubArrayList.add(smByTopicSubCategory);
}
smByTopicCategory.setQuestions(byChildrenSubArrayList);
byChildrenArrayList.add(smByTopicCategory);
}
mByTopics.setChild(byChildrenArrayList);
byTopicsMainArrayList.add(mByTopics);
}
mByTopicsArrayList.clear();
mByTopicsArrayList=byTopicsMainArrayList;
sAdpByTopics=new SAdpByTopics(mByTopicsArrayList,getActivity());
recyclerView.setAdapter(sAdpByTopics);
sAdpByTopics.notifyDataSetChanged();
}
}catch (Exception e){
e.printStackTrace();
}
break;
default:
progressDialog.dismiss();
// Toast.makeText(getActivity(), "getCategoryError : " + response, Toast.LENGTH_SHORT).show();
Log.e("getCategoryTree Not Response", "getCategoryTree Uploading Not Response : " + response);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
Log.e("getCategoryTree Error :","getCategoryTree Error :"+error.getMessage());
// Toast.makeText(getActivity(), error.getMessage(), Toast.LENGTH_LONG).show();
}
}){
};/* {
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> map = new HashMap<String, String>();
// map.put("uid", String.valueOf(ConfigManager.getUserId()));
return map;
}
};*/
stringRequest.setRetryPolicy(new DefaultRetryPolicy(
0,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
requestQueue.add(stringRequest);
}
}
适配器类回收项目
import android.app.Activity;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
public class SAdpByTopics extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
ArrayList<MByTopics> topicsArrayList=new ArrayList<>();
Activity activity;
public SAdpByTopics(ArrayList<MByTopics> topicsArrayList,Activity activity){
this.topicsArrayList=topicsArrayList;
this.activity=activity;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemeView= LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_by_topic_list,parent,false);
RecyclerView.ViewHolder holder=new Holder(itemeView);
holder.setIsRecyclable(false);
return holder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final Holder classHolder = (Holder) holder;
try{
classHolder.txt_topic_name.setText(topicsArrayList.get(position).getCatname());
}catch (Exception e){
e.printStackTrace();
}
}
@Override
public int getItemCount() {
return topicsArrayList.size();
}
class Holder extends RecyclerView.ViewHolder implements View.OnClickListener {
TextView txt_topic_name;
public Holder(View itemView) {
super(itemView);
txt_topic_name = (TextView) itemView.findViewById(R.id.txt_topic_name);
}
@Override
public void onClick(View v) {
}
}
}
模块类
public class MByTopics {
String id;
String topicName;
String catname;
String MainTopicJson;
ArrayList<SMByTopicCategory> child;
ArrayList<SMByTopicSubCategory> questions;
public void setId(String id){
this.id=id;
}
public String getId(){
return id;
}
public void setCatname(String catname) {
this.catname = catname;
}
public String getCatname() {
return catname;
}
public void setTopicName(String topicName) {
this.topicName = topicName;
}
public String getTopicName() {
return topicName;
}
public void setChild(ArrayList<SMByTopicCategory> child) {
this.child = child;
}
public String getMainTopicJson() {
return MainTopicJson;
}
public void setMainTopicJson(String mainTopicJson) {
MainTopicJson = mainTopicJson;
}
public ArrayList<SMByTopicCategory> getChild() {
return child;
}
public void setQuestions(ArrayList<SMByTopicSubCategory> questions) {
this.questions = questions;
}
public ArrayList<SMByTopicSubCategory> getQuestions() {
return questions;
}
public ArrayList<MByTopics> getByTopicList() {
ArrayList<MByTopics> mByTopicsArrayList = new ArrayList<>();
for (int i=0;i<11;i++){
MByTopics mQuestionBankCategory=new MByTopics();
if (i==1 || i== 5|| i==9){
mQuestionBankCategory.setTopicName("Microeconomics");
}else if (i==2 || i== 10|| i==6) {
mQuestionBankCategory.setTopicName("Macroeconomics");
}else {
mQuestionBankCategory.setTopicName("Current Isssues");
}
mByTopicsArrayList.add(mQuestionBankCategory);
}
return mByTopicsArrayList;
}
}
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
我很高兴我不是唯一一个认为这些“最小”示例都涉及创建至少4个不同文件来创建一个简单工具的人。
下面是Kotlin中的一个独立活动(基于Saifur Rahman Mohsin的回答)，它实现了一个基本的回收器视图:
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
class ModelDownloaderActivity : AppCompatActivity() {
val items = (1..50).toList().map { "Item #$it" }
inner class ItemHolder(view: View, var textField: TextView = view.findViewById(android.R.id.text1)) : RecyclerView.ViewHolder(view)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// Create recycler view, or find it in Activity's XML file if you prefer
val myLayoutResource: Int? = null // Replace with R.layout.activity_model_downloader if you want to use an XML layout with a recycler view in it
val recyclerView = myLayoutResource?.let {
setContentView(it)
findViewById(R.id.modelRecyclerView) // Replace with ID of your recycler view in layout
} ?: RecyclerView(this).also { setContentView(ConstraintLayout(this).apply { addView(it) }) }
// Bind controls to it.
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = object : RecyclerView.Adapter<ItemHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) =
ItemHolder(LayoutInflater.from(parent.context).inflate(android.R.layout.simple_list_item_1, parent, false))
override fun getItemCount() = items.size
override fun onBindViewHolder(holder: ItemHolder, position: Int) {
holder.textField.text = items[position]
holder.textField.setOnClickListener {
Toast.makeText(this@ModelDownloaderActivity, "Clicked $position", Toast.LENGTH_SHORT).show()
}
}
}
}
}
实现androidx.recyclerview: recyclerview:… 建议更新到下面的androidx库:
https://developer.android.com/jetpack/androidx/releases/recyclerview
布局文件Widget XML标签必须更新为: androidx.recyclerview.widget.RecyclerView
推荐文章
- Manifest合并失败:uses-sdk:minSdkVersion 14
- 为什么Android工作室说“等待调试器”如果我不调试?
- 如何检查我的EditText字段是否为空?
- Android从图库中选择图像
- 后台任务，进度对话框，方向改变-有任何100%工作的解决方案吗?
- Android:垂直对齐多行EditText(文本区域)
- Android无尽列表
- Android room persistent: AppDatabase_Impl不存在
- 错误:执行失败的任务':app:compileDebugKotlin'。>编译错误。详细信息请参见日志
- 在Android中使用URI生成器或使用变量创建URL
- 缩放图像以填充ImageView宽度并保持纵横比
- 列表视图的自定义适配器
- 在Android中设置TextView span的颜色
- 如何以编程方式在RelativeLayout中布局视图?
- Android Facebook集成无效键散列
