当用户滚动动态数据自动获取和显示时，如何显示无限的结果。因此加载时间消耗，应用程序将正常工作。
文件名： MainActivity.java //我要显示的主要Java文件加载更多
package com.ejobbox.ejobbox;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.View;
import android.widget.ProgressBar;
import java.util.ArrayList;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ProgressBar progressBar;
private LinearLayoutManager mLayoutManager;
private RecyclerViewAdapter adapter;
private ArrayList<Model> list;
private String baseURL="http://mywebsite.com/";
public static List<WPPost> mListPost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView= findViewById(R.id.recycler_view);
progressBar=findViewById(R.id.progressbar);
mLayoutManager=new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL,false);
recyclerView.setLayoutManager(mLayoutManager);
list=new ArrayList<Model>();
// call retrofit
getRetrofit();
adapter=new RecyclerViewAdapter(list,MainActivity.this);
recyclerView.setAdapter(adapter);
}
private void getRetrofit(){
Retrofit retrofit=new Retrofit.Builder()
.baseUrl(baseURL)
.addConverterFactory(GsonConverterFactory.create())
.build();
RetrofitArrayApi service = retrofit.create(RetrofitArrayApi.class);
Call<List<WPPost>> call= service.getPostInfo();
call.enqueue(new Callback<List<WPPost>>() {
@Override
public void onResponse(Call<List<WPPost>> call, Response<List<WPPost>> response) {
Log.e("mainactivty","response"+ response.body());
progressBar.setVisibility(View.GONE);
for(int i=0; i<response.body().size();i++){
Log.e ("main","Title"+ response.body().get(i).getTitle().getRendered()+" "+
response.body().get(i).getId());
String tempdetails=response.body().get(i).getExcerpt().getRendered().toString();
tempdetails=tempdetails.replace("<p>","");
tempdetails=tempdetails.replace("</p>","");
String linkdetail=response.body().get(i).getLink().toString();
String date=response.body().get(i).getDate().toString();
list.add(new Model(Model.IMAGE_TYPE, response.body().get(i).getTitle().getRendered(),
tempdetails,date,
response.body().get(i).getLinks().getWpFeaturedmedia().get(0).getHref(),linkdetail) );
}
adapter.notifyDataSetChanged();
}
@Override
public void onFailure(Call<List<WPPost>> call, Throwable t) {
}
});
}
}
（这是我定义了recyclear视图适配器的RecyclearViewAdapter。）
文件名： RecyclearViewAdapter.java // Recyclear View Adapter File
package com.ejobbox.ejobbox;
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
public class RecyclerViewAdapter extends RecyclerView.Adapter{
private ArrayList<Model> dataset;
private Context mContext;
public RecyclerViewAdapter(ArrayList<Model> mlist, Context context) {
this.dataset=mlist;
this.mContext=context;
}
public static class ImageTypeViewHolder extends RecyclerView.ViewHolder{
TextView title,subtitle,link,date;
ImageView imageView;
public ImageTypeViewHolder(View itemView){
super(itemView);
this.title=(TextView)itemView.findViewById(R.id.title);
this.link=(TextView)itemView.findViewById(R.id.link);
this.subtitle=(TextView) itemView.findViewById(R.id.subtitle);
this.imageView=(ImageView) itemView.findViewById(R.id.icon);
this.date=(TextView)itemView.findViewById(R.id.date);
}
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.postdetails,parent,false);
return new ImageTypeViewHolder(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
final Model object=dataset.get(position);
((ImageTypeViewHolder) holder).title.setText(object.title);
((ImageTypeViewHolder) holder).subtitle.setText(object.subtitle);
//((ImageTypeViewHolder) holder).link.setText(object.link);
((ImageTypeViewHolder) holder).date.setText((CharSequence) object.date);
((ImageTypeViewHolder) holder).title.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(mContext, WPPostDetails.class);
intent.putExtra("itemPosition",position);
intent.putExtra("link",object.link.toString());
mContext.startActivity(intent);
}
});
}
@Override
public int getItemCount() { return dataset.size();}
}
答案 0 :(得分：1)
不要使用无限滚动它不能按预期工作。
您可以使用此
recyclerView.addOnScrollListener(new OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (isLastItemDisplaying())
{
scrollCount=scrollCount+10;
L.v("scroll count",""+recyclerView.getAdapter().getItemCount());
loadMoreItems(scrollCount);
}
}
});
private boolean isLastItemDisplaying()
{
if (storiesList.getAdapter().getItemCount()!=0) {
int last_visible_count=manager.findFirstCompletelyVisibleItemPosition();
if (last_visible_count!=RecyclerView.NO_POSITION && last_visible_count==storiesList.getAdapter().getItemCount()-1) {
return true;
}
}
return false;
}
在这个loadMoreItems方法中调用你的api。确保在每次api调用时将此滚动计数发送到您的服务器。并且在sql查询中您必须执行此操作
EX： 例如，第一次计数为0; SELECT * FROM posts LIMIT 0,10
在Scroll上你的scrollCount值会增加10（你可以使用你的值滚动计数值来获取接下来的10行）
SELECT * FROM帖子LIMIT 10,10
答案 1 :(得分：0)
您只需将新数据添加到列表电影的最后位置，一切都会正常工作。为此 -
创建一个新的列表＆lt; Model＆gt;列表newList 并将更新后的数据添加到其中。现在将 newList 添加到列表并通知适配器。就像下面一样 -
List<Model> newList = new ArrayList<>();
// your code..
recyclerView.addOnScrollListener(new EndlessScrollListener(mLayoutManager) {
@Override
public void onLoadMore(int page, int totalItemsCount) {
loadingMore=true;
getRetrofit();
int currentSize = adapter.getItemCount();
list.addAll(newList);
adapter.notifyItemRangeInserted(currentSize, list.size() - 2);
}
});
在这里，您可以找到 EndlessScrollListener 类。
请查看我的其他相关答案以了解更多详情 -
How to load more items in a ListView using AsyncTask or any other method
Continious scrolling in recyclerview by Json request and adding new item with previous
希望它会有所帮助。
答案 2 :(得分：0)
以下是使用从各种来源编译的简单库简单实施 Endless Scrolling RecyclerView 的示例。
在build.gradle
implementation 'com.hereshem.lib:awesomelib:2.0.1'
使用
在Activity中创建RecyclerView布局<com.hereshem.lib.recycler.MyRecyclerView
android:id="@+id/recycler"
app:layoutManager="LinearLayoutManager"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
通过传递支持
的类来创建ViewHolderpublic static class EVHolder extends MyViewHolder<Events> {
TextView date, title, summary;
public EVHolder(View v) {
super(v);
date = v.findViewById(R.id.date);
title = v.findViewById(R.id.title);
summary = v.findViewById(R.id.summary);
}
@Override
public void bindView(Events c) {
date.setText(c.date);
title.setText(c.title);
summary.setText(c.summary);
}
}
通过在适配器中传递项目，类和布局，创建具有极少行的项目列表变量和适配器
List<Events> items = new ArrayList<>();
MyRecyclerView recycler = findViewById(R.id.recycler);
RecyclerViewAdapter adapter = new RecyclerViewAdapter(this, items, EVHolder.class, R.layout.row_event);
recycler.setAdapter(adapter);
可以使用以下行添加ClickListener和LoadMore Listener
recycler.setOnItemClickListener(new MyRecyclerView.OnItemClickListener() {
@Override
public void onItemClick(int position) {
Toast.makeText(MainActivity.this, "Recycler Item Clicked " + position, Toast.LENGTH_SHORT).show();
}
});
recycler.setOnLoadMoreListener(new MyRecyclerView.OnLoadMoreListener() {
@Override
public void onLoadMore() {
loadData();
}
});
loadData();
加载数据后，必须调用
recycler.loadComplete();
当不需要LoadMore时，可以通过调用
隐藏LoadMore布局recycler.hideLoadMore();
可以找到更多示例here
希望这会有所帮助：）