如何在 android 中将 Layout 设置为 RecyclerView
How to set Layout to RecyclerView in android
我想从服务器加载数据并在我的应用程序中显示 (RecyclerView)，对于此作业，当应用程序启动时它显示 10 posts 并且在滚动时显示 recyclerView显示另一个 post .
我写了下面的代码，但是当得到其他 10 posts 时，不显示 加载布局！我想当得到其他 10 posts 时，首先 show loading 布局然后显示其他 10 posts!
为了连接到互联网，我使用 Retrofit v2，对于 recyclerView 的自定义 Endless 方法，我使用这个 class： EndLess Class
我的Activity代码：
public class Category_page extends AppCompatActivity implements ConnectivityReceiver.ConnectivityReceiverListener {
private static final long RIPPLE_DURATION = 250;
private Toolbar toolbar;
private TextView toolbar_title;
private ImageView toolbar_menuImage;
private Button categoryCheckNet_button;
private RelativeLayout root;
private CategoryAdapter mAdapter;
private RecyclerView cat_recyclerView;
private LinearLayoutManager mLayoutManager;
private RelativeLayout loadLayout, checkNetLayout;
private String catTitle = "";
private Integer catID;
private Bundle bundle;
private int pageCount = 1;
private Context context;
private List<R_CatModel> models;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.category_page);
// Hide StatusBar color
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
// Initializing
context = Category_page.this;
toolbar = (Toolbar) findViewById(R.id.category_toolbar);
cat_recyclerView = (RecyclerView) findViewById(R.id.category_recycler);
toolbar_title = (TextView) toolbar.findViewById(R.id.toolbar_pages_title);
mLayoutManager = new LinearLayoutManager(this);
root = (RelativeLayout) findViewById(R.id.category_root);
loadLayout = (RelativeLayout) findViewById(R.id.category_empty_layout);
checkNetLayout = (RelativeLayout) findViewById(R.id.category_checkInternet_layout);
categoryCheckNet_button = (Button) checkNetLayout.findViewById(R.id.checkNet_button);
// Toolbar
setSupportActionBar(toolbar);
if (toolbar != null) {
getSupportActionBar().setTitle("");
}
// Receive Data
bundle = getIntent().getExtras();
catID = bundle.getInt("categoryID");
if (bundle != null) {
catTitle = bundle.getString("categoryTitle");
}
if (catTitle != null) {
toolbar_title.setText(catTitle);
}
// Load Data
loadData();
// Load Progress
loadLayout.setVisibility(View.VISIBLE);
// Menu
View guillotineMenu = LayoutInflater.from(this).inflate(R.layout.menu_layout, null);
root.addView(guillotineMenu);
toolbar_menuImage = (ImageView) toolbar.findViewById(R.id.toolbar_pages_logo);
new GuillotineAnimation.GuillotineBuilder(guillotineMenu, guillotineMenu.findViewById(R.id.menu_layout_image), toolbar_menuImage)
.setStartDelay(RIPPLE_DURATION)
.setActionBarViewForAnimation(toolbar)
.setClosedOnStart(true)
.build();
// RecyclerView
cat_recyclerView.setLayoutManager(mLayoutManager);
cat_recyclerView.setHasFixedSize(true);
cat_recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(mLayoutManager) {
@Override
public void onLoadMore(int current_page) {
Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
Call<R_CatModelResponse> call = apiInterface.getCatMoreResponse(catID, current_page);
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
mAdapter.addNewItem(response.body().getCat_posts());
//loadLayout.setVisibility(View.GONE);
} else {
//loadLayout.setVisibility(View.VISIBLE);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
}
});
}
});
}
private void loadData() {
boolean isConnected = ConnectivityReceiver.isConnected();
retrofitData(isConnected);
}
private void retrofitData(boolean isConnect) {
if (isConnect) {
Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
Call<R_CatModelResponse> call = apiInterface.getCatResponse(catID);
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
models = response.body().getCat_posts();
mAdapter = new CategoryAdapter(context, cat_recyclerView, models);
cat_recyclerView.setAdapter(mAdapter);
loadLayout.setVisibility(View.GONE);
} else {
//loadLayout.setVisibility(View.VISIBLE);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
checkNetLayout.setVisibility(View.GONE);
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
//loadLayout.setVisibility(View.VISIBLE);
//TastyToast.makeText(context, "لطفا برنامه را مجددا باز کنید", TastyToast.LENGTH_LONG, TastyToast.ERROR);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
//Cat_EmptyLayout.setVisibility(View.VISIBLE);
Log.e("CatResponseError", "Error : " + t);
}
});
} else {
//loadLayout.setVisibility(View.GONE);
checkNetLayout.setVisibility(View.VISIBLE);
if (mAdapter != null) {
mAdapter.clear();
cat_recyclerView.setAdapter(mAdapter);
}
categoryCheckNet_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
loadData();
}
});
}
}
public void post_back(View view) {
onBackPressed();
}
@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
@Override
protected void onResume() {
super.onResume();
// register connection status listener
MyApplication.getInstance().setConnectivityListener(this);
}
@Override
public void onNetworkConnectionChanged(boolean isConnected) {
retrofitData(isConnected);
}
}
我的适配器代码：
public class CategoryAdapter extends RecyclerView.Adapter {
private List<R_CatModel> mDateSet;
private Context mContext;
private final int VIEW_ITEM = 1;
private final int VIEW_PROG = 0;
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 10;
private int lastVisibleItem, totalItemCount;
private boolean loading;
private OnLoadMoreListener onLoadMoreListener;
public CategoryAdapter(Context context, RecyclerView recyclerView, List<R_CatModel> dataSet) {
this.mContext = context;
this.mDateSet = dataSet;
if (recyclerView.getLayoutManager() instanceof LinearLayoutManager) {
final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView
.getLayoutManager();
recyclerView
.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView,
int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = linearLayoutManager.getItemCount();
lastVisibleItem = linearLayoutManager
.findLastVisibleItemPosition();
if (!loading
&& totalItemCount <= (lastVisibleItem + visibleThreshold)) {
// End has been reached
// Do something
if (onLoadMoreListener != null) {
onLoadMoreListener.onLoadMore();
}
loading = true;
}
}
});
}
}
@Override
public int getItemViewType(int position) {
return mDateSet.get(position) != null ? VIEW_ITEM : VIEW_PROG;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder vh;
if (viewType == VIEW_ITEM) {
View v = LayoutInflater.from(parent.getContext()).inflate(
R.layout.post_card_layout, parent, false);
vh = new DataViewHolder(v);
} else {
View v = LayoutInflater.from(parent.getContext()).inflate(
R.layout.progressbar_item, parent, false);
vh = new ProgressViewHolder(v);
}
return vh;
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
if (holder instanceof DataViewHolder) {
((DataViewHolder) holder).main_post_title.setText(Html.fromHtml(mDateSet.get(position).getTitle()));
Glide.with(mContext)
.load(mDateSet.get(position).getThumbnail_images().getMedium().getUrl())
.placeholder(R.drawable.post_image)
.crossFade()
.override(600, 350)
.into(((DataViewHolder) holder).main_post_image);
((DataViewHolder) holder).main_post_content.setText(Html.fromHtml(mDateSet.get(position).getContent()));
// Convert Date ////////
String date = mDateSet.get(position).getDate();
String[] parts = date.split(" ");
String datePart = parts[0];
String timePart = parts[1];
int year;
int month;
int day;
String[] dateParts = datePart.split("-");
year = Integer.parseInt(dateParts[0]);
month = Integer.parseInt(dateParts[1]);
day = Integer.parseInt(dateParts[2]);
JalaliCalendar.YearMonthDate georgianDate = new JalaliCalendar.YearMonthDate(year, month, day);
JalaliCalendar.YearMonthDate JalaliDate = JalaliCalendar.gregorianToJalali(georgianDate);
String jalaliDateTime = JalaliDate.toString();
((DataViewHolder) holder).main_dateTime.setText(jalaliDateTime);
////////////////////////
((DataViewHolder) holder).main_author.setText(Html.fromHtml(mDateSet.get(position).getCatAuthor().getAuthorName()));
((DataViewHolder) holder).main_author.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
R_CatModel model = mDateSet.get(position);
v.getContext().startActivity(new Intent(v.getContext(), Profile_page.class));
//.putExtra("author", model.getAuthor())
//.putExtra("authorID", model.getAuthorID())
//.putExtra("authorStatus", model.getAuthorStatus()));
}
});
((DataViewHolder) holder).main_category.setText(Html.fromHtml(String.valueOf(mDateSet.get(position).getCategories().get(0).getCatTitle())));
((DataViewHolder) holder).main_category.setTextColor(mContext.getResources().getColor(R.color.colorAccent));
((DataViewHolder) holder).main_post_image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getPosition();
R_CatModel model = mDateSet.get(pos);
v.getContext().startActivity(new Intent(v.getContext(), PostShow_page.class)
.putExtra("title", model.getTitle())
.putExtra("image", model.getThumbnail())
.putExtra("content", model.getContent())
.putExtra("dateTime", model.getDate())
//.putExtra("author", model.getAuthor())
.putExtra("category", model.getTitle()));
}
});
} else {
((ProgressViewHolder) holder).progressBar.setVisibility(View.VISIBLE);
}
}
public void setLoaded() {
loading = false;
}
@Override
public int getItemCount() {
return mDateSet.size();
}
public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
this.onLoadMoreListener = onLoadMoreListener;
}
public void remove(int position) {
mDateSet.remove(position);
notifyItemRemoved(position);
}
public void clear() {
mDateSet.clear();
notifyDataSetChanged();
}
public void addNewItem(List<R_CatModel> newContent) {
int start = this.mDateSet.size();//contents is a List of your items initialize it your constructor
int end = newContent.size();
mDateSet.addAll(newContent);
notifyItemRangeInserted(start + 1, end);
}
public void add(List<R_CatModel> models) {
mDateSet.addAll(models);
notifyDataSetChanged();
}
public void update(List<R_CatModel> models) {
mDateSet.clear();
mDateSet.addAll(models);
notifyDataSetChanged();
}
public class DataViewHolder extends RecyclerView.ViewHolder {
private TextView main_post_title, main_post_content, main_dateTime, main_author, main_category;
private ImageView main_post_image;
public DataViewHolder(final View itemView) {
super(itemView);
main_post_title = (TextView) itemView.findViewById(R.id.post_content_title);
main_post_image = (ImageView) itemView.findViewById(R.id.post_picture_image);
main_post_content = (TextView) itemView.findViewById(R.id.post_content_text);
main_dateTime = (TextView) itemView.findViewById(R.id.post_date_text);
main_author = (TextView) itemView.findViewById(R.id.post_name_text);
main_category = (TextView) itemView.findViewById(R.id.post_category_text);
}
}
public static class ProgressViewHolder extends RecyclerView.ViewHolder {
public AVLoadingIndicatorView progressBar;
public ProgressViewHolder(View v) {
super(v);
progressBar = (AVLoadingIndicatorView) v.findViewById(R.id.avloadingIndicatorView);
}
}
}
我的Json:
{
"status": "ok",
"count": 9,
"pages": 3,
"category": {
"id": 1,
"slug": "%d8%b3%d8%b1%da%af%d8%b1%d9%85%db%8c",
"title": "\u0633\u0631\u06af\u0631\u0645\u06cc",
"description": "\u062a\u0648\u06cc \u0627\u06cc\u0646 \u06a9\u0644\u0648\u0646\u06cc \u0647\u0645\u0647 \u0686\u06cc\u0632 \u0648\u0627\u0633\u0647 \u0633\u0631\u06af\u0631\u0645 \u0628\u0648\u062f\u0646 \u0647\u0633\u062a. \u067e\u0633 \u0628\u062f\u0648 \u0628\u0631\u0648 \u062a\u0648\u0634",
"parent": 0,
"post_count": 29
},
"posts": [{
"id": 85,
"type": "post",
"slug": "%d8%b9%d9%86%d9%88%d8%a7%d9%86-%d8%b3%d9%88%d9%85-%d8%a8%d8%b1%d8%a7%db%8c-%d8%b1%d9%81%d8%b1%d8%b4",
"url": "http:\/\/tellfa.com\/tafrihgah\/?p=85",
"status": "publish",
"title": "\u0639\u0646\u0648\u0627\u0646 \u0633\u0648\u0645 \u0628\u0631\u0627\u06cc \u0631\u0641\u0631\u0634",
"title_plain": "\u0639\u0646\u0648\u0627\u0646 \u0633\u0648\u0645 \u0628\u0631\u0627\u06cc \u0631\u0641\u0631\u0634",
"content": "<p>\u062f\u06cc\u06af\u0647 \u0639\u0635\u0628\u0627\u0646\u06cc \u0634\u062f\u0645\u060c \u0686\u0631\u0627 \u0631\u0641\u0631\u0634 \u0646\u0645\u06cc\u06a9\u0646\u0647! :@<\/p>\n",
"excerpt": "<p>\u062f\u06cc\u06af\u0647 \u0639\u0635\u0628\u0627\u0646\u06cc \u0634\u062f\u0645\u060c \u0686\u0631\u0627 \u0631\u0641\u0631\u0634 \u0646\u0645\u06cc\u06a9\u0646\u0647! :@<\/p>\n",
"date": "2016-04-20 15:02:26",
"modified": "2016-04-20 15:02:26",
"categories": [{
"id": 1,
"slug": "%d8%b3%d8%b1%da%af%d8%b1%d9%85%db%8c",
"title": "\u0633\u0631\u06af\u0631\u0645\u06cc",
"description": "\u062a\u0648\u06cc \u0627\u06cc\u0646 \u06a9\u0644\u0648\u0646\u06cc \u0647\u0645\u0647 \u0686\u06cc\u0632 \u0648\u0627\u0633\u0647 \u0633\u0631\u06af\u0631\u0645 \u0628\u0648\u062f\u0646 \u0647\u0633\u062a. \u067e\u0633 \u0628\u062f\u0648 \u0628\u0631\u0648 \u062a\u0648\u0634",
"parent": 0,
"post_count": 29
}],
"tags": [],
"author": {
"id": 1,
"slug": "tellfa",
"name": "\u0645\u062d\u0645\u062f",
"first_name": "",
"last_name": "",
"nickname": "\u0645\u062d\u0645\u062f",
"url": "http:\/\/codesaz.com",
"description": "\u0627\u06cc\u0646 \u0632\u0646\u062f\u06af\u06cc \u0646\u0627\u0645\u0647 \u0645\u0646 \u0627\u0633\u062a",
"avatar": "76"
},
"comments": [],
"attachments": [{
"id": 86,
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024.jpg",
"slug": "wallpapersmania_vol119-024",
"title": "[WallpapersMania]_vol119-024",
"description": "",
"caption": "",
"parent": 85,
"mime_type": "image\/jpeg",
"images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024.jpg",
"width": 1680,
"height": 1050
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-300x188.jpg",
"width": 300,
"height": 188
},
"medium_large": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-768x480.jpg",
"width": 768,
"height": 480
}
}
}],
"comment_count": 0,
"comment_status": "open",
"thumbnail": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-150x150.jpg",
"custom_fields": {},
"thumbnail_size": "thumbnail",
"thumbnail_images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024.jpg",
"width": 1680,
"height": 1050
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-300x188.jpg",
"width": 300,
"height": 188
},
"medium_large": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-768x480.jpg",
"width": 768,
"height": 480
}
}
}
如何在获取其他 10 post 时显示加载布局？
您没有正确实施 getItemViewType 和 getItemCount：
@Override
public int getItemViewType(int position) {
if (position < mDataSet.size()) {
return VIEW_ITEM;
}
return VIEW_PROG;
}
和
@Override
public int getItemCount() {
return mDateSet.size() + 1;
}
另外将 notifyItemRangeInserted(start + 1, end); 替换为 notifyDataSetChanged(); in addNewItem
编辑
在您的适配器中保留一个布尔值 private boolean hasMore = true 并像这样编辑 getItemCount()：
@Override
public int getItemCount() {
if (hasMore)
return mDateSet.size() + 1;
else
return mDataSet.size();
}
你会有两种情况：
1. 如果您从之前的回复中知道没有更多的项目可以加载，请设置您的 hasMore = false .
2. 如果您不知道，那么在您的 Activity 中，当您在 onLoadMore 中得到响应时，如果 response== null || response.body() == null || response.body().getCat_posts().size() == 0 设置 hasMore = false.
这完全取决于您从服务器获得的响应
编辑
在你的适配器中添加一个方法
public void setHasMore(boolean hasMore) {
this.hasMore = hasMore;
}
在 onLoadMore
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
adapter.setHasMore(response.body().getPages() !=current_page+1)
mAdapter.addNewItem(response.body().getCat_posts());
//loadLayout.setVisibility(View.GONE);
} else {
//loadLayout.setVisibility(View.VISIBLE);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
}
});
使用 activity 布局中的进度条为 loadmore 创建一个布局，并将其可见性设置为 gone ，现在将 loadMore 布局的可见性设置为在 public void onLoadMore(int current_page) 方法并在您的网络服务响应中将其设置回 gone（在 onResponse 和 onFailure 方法中）
load_more.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/load_more"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#AA000000"
android:gravity="center"
android:visibility="gone"
android:padding="5dp">
<ProgressBar
android:id="@+id/more_progress"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/more_progress"
android:padding="5dp"
android:text="Loading results..."
android:textColor="#ffffff"
android:textSize="@dimen/medium_text_size" />
</RelativeLayout>
在你的 activity xml 文件中包含 load_more 就像 -
listing_activity.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:background="@color/listing_background"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycleView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textSize="@dimen/medium_text_size"
android:gravity="center"
android:id="@+id/noListFound"
android:textColor="@color/orange"
android:text="No List found Please click here to add a new one"
android:visibility="gone"
android:padding="@dimen/header_margin"/>
</RelativeLayout>
<include layout="@layout/load_more"/>
</LinearLayout>
BaseLoadMoreActivity.java
public abstract class BaseLoadMoreActivity extends Activity {
@BindView(R.id.recycleView)
RecyclerView recyclerView;
@BindView(R.id.load_more)
RelativeLayout loadMore;
private LinearLayoutManager ll;
private int page = 1;
private boolean isNoData = false;
private boolean isLoading = false;
private RecyclerView.OnScrollListener scrollListener = new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy > 0) //check for scroll down
{
int visibleItemCount = ll.getChildCount();
int totalItemCount = ll.getItemCount();
int pastVisiblesItems = ll.findFirstVisibleItemPosition();
if (!isLoading && !isNoData) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loadMore.setVisibility(View.VISIBLE);
page++;
LoadMoreList();
isLoading = true;
}
}
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ll = new LinearLayoutManager(this);
ll.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(ll);
recyclerView.addOnScrollListener(scrollListener);
}
public abstract void LoadMoreList();
}
现在使用 BaseLoadMoreActivity 扩展您的 category_page.java 并更改代码
@Override
public void LoadMoreList() {
boolean isConnected = ConnectivityReceiver.isConnected();
retrofitData(isConnected);
}
private void retrofitData(boolean isConnect) {
if (isConnect) {
Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
Call<R_CatModelResponse> call = apiInterface.getCatResponse(catID);
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
models = response.body().getCat_posts();
mAdapter = new CategoryAdapter(context, cat_recyclerView, models);
cat_recyclerView.setAdapter(mAdapter);
loadMore.setVisibility(View.GONE);
isLoading = false;
} else {
loadMore.setVisibility(View.GONE);
isLoading = false;
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
checkNetLayout.setVisibility(View.GONE);
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
loadMore.setVisibility(View.GONE);
isLoading = false;
//TastyToast.makeText(context, "لطفا برنامه را مجددا باز کنید", TastyToast.LENGTH_LONG, TastyToast.ERROR);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
//Cat_EmptyLayout.setVisibility(View.VISIBLE);
Log.e("CatResponseError", "Error : " + t);
}
});
} else {
loadMore.setVisibility(View.GONE);
isLoading = false;
checkNetLayout.setVisibility(View.VISIBLE);
if (mAdapter != null) {
mAdapter.clear();
cat_recyclerView.setAdapter(mAdapter);
}
categoryCheckNet_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
loadData();
}
});
}
}
请删除查找recycleView和设置它的布局管理器的代码
category_page.java 正如我们在 BaseLoadMoreActivity 中所做的那样，否则代码将无法运行。
我刚刚提供了示例代码。希望对您有所帮助...
我想从服务器加载数据并在我的应用程序中显示 (RecyclerView)，对于此作业，当应用程序启动时它显示 10 posts 并且在滚动时显示 recyclerView显示另一个 post .
我写了下面的代码，但是当得到其他 10 posts 时，不显示 加载布局！我想当得到其他 10 posts 时，首先 show loading 布局然后显示其他 10 posts!
为了连接到互联网，我使用 Retrofit v2，对于 recyclerView 的自定义 Endless 方法，我使用这个 class： EndLess Class
我的Activity代码：
public class Category_page extends AppCompatActivity implements ConnectivityReceiver.ConnectivityReceiverListener {
private static final long RIPPLE_DURATION = 250;
private Toolbar toolbar;
private TextView toolbar_title;
private ImageView toolbar_menuImage;
private Button categoryCheckNet_button;
private RelativeLayout root;
private CategoryAdapter mAdapter;
private RecyclerView cat_recyclerView;
private LinearLayoutManager mLayoutManager;
private RelativeLayout loadLayout, checkNetLayout;
private String catTitle = "";
private Integer catID;
private Bundle bundle;
private int pageCount = 1;
private Context context;
private List<R_CatModel> models;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.category_page);
// Hide StatusBar color
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
// Initializing
context = Category_page.this;
toolbar = (Toolbar) findViewById(R.id.category_toolbar);
cat_recyclerView = (RecyclerView) findViewById(R.id.category_recycler);
toolbar_title = (TextView) toolbar.findViewById(R.id.toolbar_pages_title);
mLayoutManager = new LinearLayoutManager(this);
root = (RelativeLayout) findViewById(R.id.category_root);
loadLayout = (RelativeLayout) findViewById(R.id.category_empty_layout);
checkNetLayout = (RelativeLayout) findViewById(R.id.category_checkInternet_layout);
categoryCheckNet_button = (Button) checkNetLayout.findViewById(R.id.checkNet_button);
// Toolbar
setSupportActionBar(toolbar);
if (toolbar != null) {
getSupportActionBar().setTitle("");
}
// Receive Data
bundle = getIntent().getExtras();
catID = bundle.getInt("categoryID");
if (bundle != null) {
catTitle = bundle.getString("categoryTitle");
}
if (catTitle != null) {
toolbar_title.setText(catTitle);
}
// Load Data
loadData();
// Load Progress
loadLayout.setVisibility(View.VISIBLE);
// Menu
View guillotineMenu = LayoutInflater.from(this).inflate(R.layout.menu_layout, null);
root.addView(guillotineMenu);
toolbar_menuImage = (ImageView) toolbar.findViewById(R.id.toolbar_pages_logo);
new GuillotineAnimation.GuillotineBuilder(guillotineMenu, guillotineMenu.findViewById(R.id.menu_layout_image), toolbar_menuImage)
.setStartDelay(RIPPLE_DURATION)
.setActionBarViewForAnimation(toolbar)
.setClosedOnStart(true)
.build();
// RecyclerView
cat_recyclerView.setLayoutManager(mLayoutManager);
cat_recyclerView.setHasFixedSize(true);
cat_recyclerView.addOnScrollListener(new EndlessRecyclerOnScrollListener(mLayoutManager) {
@Override
public void onLoadMore(int current_page) {
Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
Call<R_CatModelResponse> call = apiInterface.getCatMoreResponse(catID, current_page);
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
mAdapter.addNewItem(response.body().getCat_posts());
//loadLayout.setVisibility(View.GONE);
} else {
//loadLayout.setVisibility(View.VISIBLE);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
}
});
}
});
}
private void loadData() {
boolean isConnected = ConnectivityReceiver.isConnected();
retrofitData(isConnected);
}
private void retrofitData(boolean isConnect) {
if (isConnect) {
Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
Call<R_CatModelResponse> call = apiInterface.getCatResponse(catID);
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
models = response.body().getCat_posts();
mAdapter = new CategoryAdapter(context, cat_recyclerView, models);
cat_recyclerView.setAdapter(mAdapter);
loadLayout.setVisibility(View.GONE);
} else {
//loadLayout.setVisibility(View.VISIBLE);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
checkNetLayout.setVisibility(View.GONE);
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
//loadLayout.setVisibility(View.VISIBLE);
//TastyToast.makeText(context, "لطفا برنامه را مجددا باز کنید", TastyToast.LENGTH_LONG, TastyToast.ERROR);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
//Cat_EmptyLayout.setVisibility(View.VISIBLE);
Log.e("CatResponseError", "Error : " + t);
}
});
} else {
//loadLayout.setVisibility(View.GONE);
checkNetLayout.setVisibility(View.VISIBLE);
if (mAdapter != null) {
mAdapter.clear();
cat_recyclerView.setAdapter(mAdapter);
}
categoryCheckNet_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
loadData();
}
});
}
}
public void post_back(View view) {
onBackPressed();
}
@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(CalligraphyContextWrapper.wrap(newBase));
}
@Override
protected void onResume() {
super.onResume();
// register connection status listener
MyApplication.getInstance().setConnectivityListener(this);
}
@Override
public void onNetworkConnectionChanged(boolean isConnected) {
retrofitData(isConnected);
}
}
我的适配器代码：
public class CategoryAdapter extends RecyclerView.Adapter {
private List<R_CatModel> mDateSet;
private Context mContext;
private final int VIEW_ITEM = 1;
private final int VIEW_PROG = 0;
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 10;
private int lastVisibleItem, totalItemCount;
private boolean loading;
private OnLoadMoreListener onLoadMoreListener;
public CategoryAdapter(Context context, RecyclerView recyclerView, List<R_CatModel> dataSet) {
this.mContext = context;
this.mDateSet = dataSet;
if (recyclerView.getLayoutManager() instanceof LinearLayoutManager) {
final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView
.getLayoutManager();
recyclerView
.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView,
int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = linearLayoutManager.getItemCount();
lastVisibleItem = linearLayoutManager
.findLastVisibleItemPosition();
if (!loading
&& totalItemCount <= (lastVisibleItem + visibleThreshold)) {
// End has been reached
// Do something
if (onLoadMoreListener != null) {
onLoadMoreListener.onLoadMore();
}
loading = true;
}
}
});
}
}
@Override
public int getItemViewType(int position) {
return mDateSet.get(position) != null ? VIEW_ITEM : VIEW_PROG;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RecyclerView.ViewHolder vh;
if (viewType == VIEW_ITEM) {
View v = LayoutInflater.from(parent.getContext()).inflate(
R.layout.post_card_layout, parent, false);
vh = new DataViewHolder(v);
} else {
View v = LayoutInflater.from(parent.getContext()).inflate(
R.layout.progressbar_item, parent, false);
vh = new ProgressViewHolder(v);
}
return vh;
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
if (holder instanceof DataViewHolder) {
((DataViewHolder) holder).main_post_title.setText(Html.fromHtml(mDateSet.get(position).getTitle()));
Glide.with(mContext)
.load(mDateSet.get(position).getThumbnail_images().getMedium().getUrl())
.placeholder(R.drawable.post_image)
.crossFade()
.override(600, 350)
.into(((DataViewHolder) holder).main_post_image);
((DataViewHolder) holder).main_post_content.setText(Html.fromHtml(mDateSet.get(position).getContent()));
// Convert Date ////////
String date = mDateSet.get(position).getDate();
String[] parts = date.split(" ");
String datePart = parts[0];
String timePart = parts[1];
int year;
int month;
int day;
String[] dateParts = datePart.split("-");
year = Integer.parseInt(dateParts[0]);
month = Integer.parseInt(dateParts[1]);
day = Integer.parseInt(dateParts[2]);
JalaliCalendar.YearMonthDate georgianDate = new JalaliCalendar.YearMonthDate(year, month, day);
JalaliCalendar.YearMonthDate JalaliDate = JalaliCalendar.gregorianToJalali(georgianDate);
String jalaliDateTime = JalaliDate.toString();
((DataViewHolder) holder).main_dateTime.setText(jalaliDateTime);
////////////////////////
((DataViewHolder) holder).main_author.setText(Html.fromHtml(mDateSet.get(position).getCatAuthor().getAuthorName()));
((DataViewHolder) holder).main_author.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
R_CatModel model = mDateSet.get(position);
v.getContext().startActivity(new Intent(v.getContext(), Profile_page.class));
//.putExtra("author", model.getAuthor())
//.putExtra("authorID", model.getAuthorID())
//.putExtra("authorStatus", model.getAuthorStatus()));
}
});
((DataViewHolder) holder).main_category.setText(Html.fromHtml(String.valueOf(mDateSet.get(position).getCategories().get(0).getCatTitle())));
((DataViewHolder) holder).main_category.setTextColor(mContext.getResources().getColor(R.color.colorAccent));
((DataViewHolder) holder).main_post_image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getPosition();
R_CatModel model = mDateSet.get(pos);
v.getContext().startActivity(new Intent(v.getContext(), PostShow_page.class)
.putExtra("title", model.getTitle())
.putExtra("image", model.getThumbnail())
.putExtra("content", model.getContent())
.putExtra("dateTime", model.getDate())
//.putExtra("author", model.getAuthor())
.putExtra("category", model.getTitle()));
}
});
} else {
((ProgressViewHolder) holder).progressBar.setVisibility(View.VISIBLE);
}
}
public void setLoaded() {
loading = false;
}
@Override
public int getItemCount() {
return mDateSet.size();
}
public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
this.onLoadMoreListener = onLoadMoreListener;
}
public void remove(int position) {
mDateSet.remove(position);
notifyItemRemoved(position);
}
public void clear() {
mDateSet.clear();
notifyDataSetChanged();
}
public void addNewItem(List<R_CatModel> newContent) {
int start = this.mDateSet.size();//contents is a List of your items initialize it your constructor
int end = newContent.size();
mDateSet.addAll(newContent);
notifyItemRangeInserted(start + 1, end);
}
public void add(List<R_CatModel> models) {
mDateSet.addAll(models);
notifyDataSetChanged();
}
public void update(List<R_CatModel> models) {
mDateSet.clear();
mDateSet.addAll(models);
notifyDataSetChanged();
}
public class DataViewHolder extends RecyclerView.ViewHolder {
private TextView main_post_title, main_post_content, main_dateTime, main_author, main_category;
private ImageView main_post_image;
public DataViewHolder(final View itemView) {
super(itemView);
main_post_title = (TextView) itemView.findViewById(R.id.post_content_title);
main_post_image = (ImageView) itemView.findViewById(R.id.post_picture_image);
main_post_content = (TextView) itemView.findViewById(R.id.post_content_text);
main_dateTime = (TextView) itemView.findViewById(R.id.post_date_text);
main_author = (TextView) itemView.findViewById(R.id.post_name_text);
main_category = (TextView) itemView.findViewById(R.id.post_category_text);
}
}
public static class ProgressViewHolder extends RecyclerView.ViewHolder {
public AVLoadingIndicatorView progressBar;
public ProgressViewHolder(View v) {
super(v);
progressBar = (AVLoadingIndicatorView) v.findViewById(R.id.avloadingIndicatorView);
}
}
}
我的Json:
{
"status": "ok",
"count": 9,
"pages": 3,
"category": {
"id": 1,
"slug": "%d8%b3%d8%b1%da%af%d8%b1%d9%85%db%8c",
"title": "\u0633\u0631\u06af\u0631\u0645\u06cc",
"description": "\u062a\u0648\u06cc \u0627\u06cc\u0646 \u06a9\u0644\u0648\u0646\u06cc \u0647\u0645\u0647 \u0686\u06cc\u0632 \u0648\u0627\u0633\u0647 \u0633\u0631\u06af\u0631\u0645 \u0628\u0648\u062f\u0646 \u0647\u0633\u062a. \u067e\u0633 \u0628\u062f\u0648 \u0628\u0631\u0648 \u062a\u0648\u0634",
"parent": 0,
"post_count": 29
},
"posts": [{
"id": 85,
"type": "post",
"slug": "%d8%b9%d9%86%d9%88%d8%a7%d9%86-%d8%b3%d9%88%d9%85-%d8%a8%d8%b1%d8%a7%db%8c-%d8%b1%d9%81%d8%b1%d8%b4",
"url": "http:\/\/tellfa.com\/tafrihgah\/?p=85",
"status": "publish",
"title": "\u0639\u0646\u0648\u0627\u0646 \u0633\u0648\u0645 \u0628\u0631\u0627\u06cc \u0631\u0641\u0631\u0634",
"title_plain": "\u0639\u0646\u0648\u0627\u0646 \u0633\u0648\u0645 \u0628\u0631\u0627\u06cc \u0631\u0641\u0631\u0634",
"content": "<p>\u062f\u06cc\u06af\u0647 \u0639\u0635\u0628\u0627\u0646\u06cc \u0634\u062f\u0645\u060c \u0686\u0631\u0627 \u0631\u0641\u0631\u0634 \u0646\u0645\u06cc\u06a9\u0646\u0647! :@<\/p>\n",
"excerpt": "<p>\u062f\u06cc\u06af\u0647 \u0639\u0635\u0628\u0627\u0646\u06cc \u0634\u062f\u0645\u060c \u0686\u0631\u0627 \u0631\u0641\u0631\u0634 \u0646\u0645\u06cc\u06a9\u0646\u0647! :@<\/p>\n",
"date": "2016-04-20 15:02:26",
"modified": "2016-04-20 15:02:26",
"categories": [{
"id": 1,
"slug": "%d8%b3%d8%b1%da%af%d8%b1%d9%85%db%8c",
"title": "\u0633\u0631\u06af\u0631\u0645\u06cc",
"description": "\u062a\u0648\u06cc \u0627\u06cc\u0646 \u06a9\u0644\u0648\u0646\u06cc \u0647\u0645\u0647 \u0686\u06cc\u0632 \u0648\u0627\u0633\u0647 \u0633\u0631\u06af\u0631\u0645 \u0628\u0648\u062f\u0646 \u0647\u0633\u062a. \u067e\u0633 \u0628\u062f\u0648 \u0628\u0631\u0648 \u062a\u0648\u0634",
"parent": 0,
"post_count": 29
}],
"tags": [],
"author": {
"id": 1,
"slug": "tellfa",
"name": "\u0645\u062d\u0645\u062f",
"first_name": "",
"last_name": "",
"nickname": "\u0645\u062d\u0645\u062f",
"url": "http:\/\/codesaz.com",
"description": "\u0627\u06cc\u0646 \u0632\u0646\u062f\u06af\u06cc \u0646\u0627\u0645\u0647 \u0645\u0646 \u0627\u0633\u062a",
"avatar": "76"
},
"comments": [],
"attachments": [{
"id": 86,
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024.jpg",
"slug": "wallpapersmania_vol119-024",
"title": "[WallpapersMania]_vol119-024",
"description": "",
"caption": "",
"parent": 85,
"mime_type": "image\/jpeg",
"images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024.jpg",
"width": 1680,
"height": 1050
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-300x188.jpg",
"width": 300,
"height": 188
},
"medium_large": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-768x480.jpg",
"width": 768,
"height": 480
}
}
}],
"comment_count": 0,
"comment_status": "open",
"thumbnail": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-150x150.jpg",
"custom_fields": {},
"thumbnail_size": "thumbnail",
"thumbnail_images": {
"full": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024.jpg",
"width": 1680,
"height": 1050
},
"thumbnail": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-150x150.jpg",
"width": 150,
"height": 150
},
"medium": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-300x188.jpg",
"width": 300,
"height": 188
},
"medium_large": {
"url": "http:\/\/tellfa.com\/tafrihgah\/wp-content\/uploads\/2016\/04\/WallpapersMania_vol119-024-768x480.jpg",
"width": 768,
"height": 480
}
}
}
如何在获取其他 10 post 时显示加载布局？
您没有正确实施 getItemViewType 和 getItemCount：
@Override
public int getItemViewType(int position) {
if (position < mDataSet.size()) {
return VIEW_ITEM;
}
return VIEW_PROG;
}
和
@Override
public int getItemCount() {
return mDateSet.size() + 1;
}
另外将 notifyItemRangeInserted(start + 1, end); 替换为 notifyDataSetChanged(); in addNewItem
编辑
在您的适配器中保留一个布尔值 private boolean hasMore = true 并像这样编辑 getItemCount()：
@Override
public int getItemCount() {
if (hasMore)
return mDateSet.size() + 1;
else
return mDataSet.size();
}
你会有两种情况：
1. 如果您从之前的回复中知道没有更多的项目可以加载，请设置您的 hasMore = false .
2. 如果您不知道，那么在您的 Activity 中，当您在 onLoadMore 中得到响应时，如果 response== null || response.body() == null || response.body().getCat_posts().size() == 0 设置 hasMore = false.
这完全取决于您从服务器获得的响应
编辑
在你的适配器中添加一个方法
public void setHasMore(boolean hasMore) {
this.hasMore = hasMore;
}
在 onLoadMore
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
adapter.setHasMore(response.body().getPages() !=current_page+1)
mAdapter.addNewItem(response.body().getCat_posts());
//loadLayout.setVisibility(View.GONE);
} else {
//loadLayout.setVisibility(View.VISIBLE);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
}
});
使用 activity 布局中的进度条为 loadmore 创建一个布局，并将其可见性设置为 gone ，现在将 loadMore 布局的可见性设置为在 public void onLoadMore(int current_page) 方法并在您的网络服务响应中将其设置回 gone（在 onResponse 和 onFailure 方法中）
load_more.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/load_more"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#AA000000"
android:gravity="center"
android:visibility="gone"
android:padding="5dp">
<ProgressBar
android:id="@+id/more_progress"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/more_progress"
android:padding="5dp"
android:text="Loading results..."
android:textColor="#ffffff"
android:textSize="@dimen/medium_text_size" />
</RelativeLayout>
在你的 activity xml 文件中包含 load_more 就像 - listing_activity.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:background="@color/listing_background"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_weight="1"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycleView"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textSize="@dimen/medium_text_size"
android:gravity="center"
android:id="@+id/noListFound"
android:textColor="@color/orange"
android:text="No List found Please click here to add a new one"
android:visibility="gone"
android:padding="@dimen/header_margin"/>
</RelativeLayout>
<include layout="@layout/load_more"/>
</LinearLayout>
BaseLoadMoreActivity.java
public abstract class BaseLoadMoreActivity extends Activity {
@BindView(R.id.recycleView)
RecyclerView recyclerView;
@BindView(R.id.load_more)
RelativeLayout loadMore;
private LinearLayoutManager ll;
private int page = 1;
private boolean isNoData = false;
private boolean isLoading = false;
private RecyclerView.OnScrollListener scrollListener = new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy > 0) //check for scroll down
{
int visibleItemCount = ll.getChildCount();
int totalItemCount = ll.getItemCount();
int pastVisiblesItems = ll.findFirstVisibleItemPosition();
if (!isLoading && !isNoData) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loadMore.setVisibility(View.VISIBLE);
page++;
LoadMoreList();
isLoading = true;
}
}
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ll = new LinearLayoutManager(this);
ll.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(ll);
recyclerView.addOnScrollListener(scrollListener);
}
public abstract void LoadMoreList();
}
现在使用 BaseLoadMoreActivity 扩展您的 category_page.java 并更改代码
@Override
public void LoadMoreList() {
boolean isConnected = ConnectivityReceiver.isConnected();
retrofitData(isConnected);
}
private void retrofitData(boolean isConnect) {
if (isConnect) {
Retrofit_ApiInterface apiInterface = Retrofit_ApiClient.getClient().create(Retrofit_ApiInterface.class);
Call<R_CatModelResponse> call = apiInterface.getCatResponse(catID);
call.enqueue(new Callback<R_CatModelResponse>() {
@Override
public void onResponse(Call<R_CatModelResponse> call, Response<R_CatModelResponse> response) {
if (response != null) {
models = response.body().getCat_posts();
mAdapter = new CategoryAdapter(context, cat_recyclerView, models);
cat_recyclerView.setAdapter(mAdapter);
loadMore.setVisibility(View.GONE);
isLoading = false;
} else {
loadMore.setVisibility(View.GONE);
isLoading = false;
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
TastyToast.makeText(context, "خطایی رخ داده است", TastyToast.LENGTH_LONG, TastyToast.ERROR);
}
checkNetLayout.setVisibility(View.GONE);
}
@Override
public void onFailure(Call<R_CatModelResponse> call, Throwable t) {
loadMore.setVisibility(View.GONE);
isLoading = false;
//TastyToast.makeText(context, "لطفا برنامه را مجددا باز کنید", TastyToast.LENGTH_LONG, TastyToast.ERROR);
Toast.makeText(Category_page.this, "Error 2", Toast.LENGTH_SHORT).show();
//Cat_EmptyLayout.setVisibility(View.VISIBLE);
Log.e("CatResponseError", "Error : " + t);
}
});
} else {
loadMore.setVisibility(View.GONE);
isLoading = false;
checkNetLayout.setVisibility(View.VISIBLE);
if (mAdapter != null) {
mAdapter.clear();
cat_recyclerView.setAdapter(mAdapter);
}
categoryCheckNet_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
loadData();
}
});
}
}
请删除查找recycleView和设置它的布局管理器的代码 category_page.java 正如我们在 BaseLoadMoreActivity 中所做的那样，否则代码将无法运行。
我刚刚提供了示例代码。希望对您有所帮助...