问题描述
我正在用 android studio 制作新的和我的第一个应用程序，我是菜鸟，所以不太了解它，我用改造和 wordpress 制作了应用程序，我已经成功显示了前 10 个帖子，但我不知道如何在滚动上加载更多帖子，请帮忙，这是我的主要活动，我已经实现了 EndlessRecyclerOnScrollListener.java 类，但不知道我应该在那里写什么
OnCreate：
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
list = new ArrayList<Model>();
progressBar = (ProgressBar) findViewById(R.id.progressbar);
adapter = new RecyclerViewAdapter(list,this);
mLayoutManager = new linearlayoutmanager(MainActivity.this,linearlayoutmanager.VERTICAL,false);
recyclerView.setLayoutManager(mLayoutManager);
getRetrofit();
recyclerView.setAdapter(adapter);
scrollListener = new EndlessRecyclerOnScrollListener(mLayoutManager) {
@Override
public void onLoadMore(int page,int totalItemsCount,RecyclerView view) {
}
};
// Adds the scroll listener to RecyclerView
recyclerView.addOnScrollListener(scrollListener);
recyclerView.post(new Runnable() {
@Override
public void run() {
// Notify adapter with appropriate notify methods
adapter.notifyItemRangeInserted(curSize,list.size() - 1);
}
});
}
这是我的改造：
public void getRetrofit(){
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(baseURL)
.addConverterFactory(GsonConverterFactory.create())
.build();
RetrofitArrayApi service = retrofit.create(RetrofitArrayApi.class);
String yourURl = yourURL.replace(baseURL,"");
Call<List<WPPost>> call = service.getPostInfo( yourURl);
call.enqueue(new Callback<List<WPPost>>() {
@Override
public void onResponse(Call<List<WPPost>> call,Response<List<WPPost>> response) {
Log.e("mainactivyt"," response "+ response.body());
mListPost = response.body();
progressBar.setVisibility(View.GONE);
if (response.body() != null) {
for (int i = 0; i < response.body().size(); i++ ) {
Log.e("size",list.size() + "");
System.out.println("The shortest word i is:" + 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>","");
tempdetails = tempdetails.replace("[…]","");
list.add(new Model(Model.IMAGE_TYPE,response.body().get(i).getTitle().getRendered(),tempdetails,response.body().get(i).getimages().getMedium()));
}
progressBar.setVisibility(View.GONE);
} else {
progressBar.setVisibility(View.GONE);
}
adapter.notifyDataSetChanged();
}
@Override
public void onFailure(Call<List<WPPost>> call,Throwable t) {
}
});
}
改造 API
public interface RetrofitArrayApi {
@GET("android/wp-json/wp/v2/posts")
Call<List<WPPost>> getPostInfo();
@GET("paged/list/endpoint")
static Call<WPPost.PagedList<Object>> getPagedList(@Query("page") int page) {
return null;
}
在 WPPost.java 中
public class PagedList<T> {
private int page = 0;
private List<T> results = new ArrayList<>();
private int totalResults = 0;
private int totalPages = 0;
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public List<T> getResults() {
return results;
}
public void setResults(List<T> results) {
this.results = results;
}
public int getTotalResults() {
return totalResults;
}
public void setTotalResults(int totalResults) {
this.totalResults = totalResults;
}
public int getTotalPages() {
return totalPages;
}
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
}
}
适配器
private ArrayList<Model> dataset;
private Context mContext;
int total_types;
private List<Object> list;
public RecyclerViewAdapter(ArrayList<Model> mlist,Context context) {
this.dataset = mlist;
this.mContext = context;
total_types = dataset.size();
}
public void setList(List<Object> list) {
this.list = list;
notifyDataSetChanged();
}
public void addAll(List<Object> newList) {
int lastIndex = list.size() - 1;
list.addAll(newList);
notifyItemRangeInserted(lastIndex,newList.size());
}
主活动
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mIsLoading = false;
mIsLastPage = false;
final int pageSize = 20;
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
list = new ArrayList<Model>();
progressBar = (ProgressBar) findViewById(R.id.progressbar);
adapter = new RecyclerViewAdapter(list,false);
recyclerView.setLayoutManager(mLayoutManager);
list = new ArrayList<Model>();
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("mainactivyt"," response " + response.body());
mListPost = response.body();
progressBar.setVisibility(View.GONE);
if (response.body() != null) {
for (int i = 0; i < response.body().size(); i++) {
Log.e("size",list.size() + "");
System.out.println("The shortest word i is:" + 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>","");
tempdetails = tempdetails.replace("[…]","");
list.add(new Model(Model.IMAGE_TYPE,response.body().get(i).getimages().getMedium()));
}
progressBar.setVisibility(View.GONE);
} else {
progressBar.setVisibility(View.GONE);
}
adapter.notifyDataSetChanged();
}
@Override
public void onFailure(Call<List<WPPost>> call,Throwable t) {
}
});
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView,int dx,int dy) {
super.onScrolled(recyclerView,dx,dy);
// number of visible items
int visibleItemCount = mLayoutManager.getChildCount();
// number of items in layout
int totalItemCount = mLayoutManager.getItemCount();
// the position of first visible item
int firstVisibleItemPosition = mLayoutManager.findFirstVisibleItemPosition();
boolean isNotLoadingAndNotLastPage = !mIsLoading && !mIsLastPage;
// flag if number of visible items is at the last
boolean isAtLastItem = firstVisibleItemPosition + visibleItemCount >= totalItemCount;
// validate non negative values
boolean isValidFirstItem = firstVisibleItemPosition >= 0;
// validate total items are more than possible visible items
boolean totalIsMoreThanVisible = totalItemCount >= pageSize;
// flag to kNow whether to load more
boolean shouldLoadMore = isValidFirstItem && isAtLastItem && totalIsMoreThanVisible && isNotLoadingAndNotLastPage;
if (shouldLoadMore) loadMoreItems(false);
}
});
// load the first page
loadMoreItems(true);
adapter = new RecyclerViewAdapter( list,MainActivity.this);
recyclerView.setAdapter(adapter);
}
private void loadMoreItems(boolean isFirstPage) {
// change loading state
mIsLoading = true;
mCurrentPage = mCurrentPage + 1;
// update recycler adapter with next page
RetrofitArrayApi.getPagedList(mCurrentPage).enqueue(new Callback<WPPost.PagedList<Object>>() {
@Override
public void onResponse(Call<WPPost.PagedList<Object>> call,Response<WPPost.PagedList<Object>> response) {
WPPost.PagedList<Object> result = response.body();
if (result == null) return;
else if (!isFirstPage) adapter.addAll(result.getResults());
else adapter.setList(result.getResults());
mIsLoading = false;
mIsLastPage = mCurrentPage == result.getTotalPages();
}
@Override
public void onFailure(Call<WPPost.PagedList<Object>> call,Throwable t) {
Log.e("SomeActivity",t.getMessage());
}
});
}
过去一周我已经搜索了很多，但仍然无法正常工作，请帮助....
解决方法
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