【发布时间】：2016-04-27 06:41:18
【问题描述】：
我想为一个网站开发 android 应用程序。我从json 阅读网站帖子，并在RecyclerView 每 10 个帖子显示它，当用户滚动 RecyclerView 时显示更多 10 个帖子并结束！
我是业余爱好者，我在下面编写代码，但我不知道在滚动时读取更多数据并转到下一页！ （我想在任意页面显示任意 10 个帖子）。
Json 链接： JSON LINK
AsyncTask 代码：
public class MainDataInfo {
private Context mContext;
private String ServerAddress = ServerIP.getIP();
public void getMainDataInfo(Context context) {
mContext = context;
new getInfo().execute(ServerAddress + "page=1");
}
private class getInfo extends AsyncTask<String, Void, String> {
EventBus bus = EventBus.getDefault();
private String ou_response;
private List<MainDataModel> infoModels;
@Override
protected void onPreExecute() {
CustomProcessDialog.createAndShow(mContext);
infoModels = new ArrayList<>();
}
@Override
protected String doInBackground(String... params) {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(ServerAddress + "page=1")
.cacheControl(CacheControl.FORCE_NETWORK)
.build();
Response response;
try {
response = client.newCall(request).execute();
ou_response = response.body().string();
response.body().close();
if (ou_response != null) {
try {
JSONObject postObj = new JSONObject(ou_response);
JSONArray postsArray = postObj.optJSONArray("posts");
infoModels = new ArrayList<>();
for (int i = 0; i <= infoModels.size(); i++) {
JSONObject postObject = (JSONObject) postsArray.get(i);
JSONObject images=postObject.optJSONObject("thumbnail_images");
JSONObject imagesPair=images.optJSONObject("medium");
int id = postObject.getInt("id");
String title = postObject.getString("title");
String content = postObject.getString("content");
String thumbnail = imagesPair.getString("url");
Log.d("Data", "Post id: " + id);
Log.d("Data", "Post title: " + title);
Log.d("Data", "Post title: " + thumbnail);
//Use the title and id as per your requirement
infoModels.add(new MainDataModel(id, title, content, thumbnail));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
} catch (IOException e) {
e.printStackTrace();
}
return ou_response;
}
@Override
protected void onPostExecute(String result) {
CustomProcessDialog.dissmis();
if (result != null) {
bus.post(infoModels);
}
}
}
}
我使用此代码显示任何页面帖子：ServerAddress + "page=1"
适配器代码：
public class MainAdapter2 extends RecyclerView.Adapter {
private List<MainDataModel> 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 = 5;
private int lastVisibleItem, totalItemCount;
private boolean loading;
private OnLoadMoreListener onLoadMoreListener;
public MainAdapter2(Context context, RecyclerView recyclerView, List<MainDataModel> 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(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof DataViewHolder) {
((DataViewHolder) holder).main_post_title.setText(mDateSet.get(position).getTitle());
Glide.with(mContext)
.load(mDateSet.get(position).getThumbnail())
.placeholder(R.drawable.post_image)
.crossFade()
.into(((DataViewHolder) holder).main_post_image);
((DataViewHolder) holder).main_post_content.setText(Html.fromHtml(mDateSet.get(position).getContent()));
} else {
((ProgressViewHolder) holder).progressBar.setIndeterminate(true);
}
}
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 add(List<MainDataModel> models) {
mDateSet.addAll(models);
notifyDataSetChanged();
}
public void update(List<MainDataModel> models) {
mDateSet.clear();
mDateSet.addAll(models);
notifyDataSetChanged();
}
public class DataViewHolder extends RecyclerView.ViewHolder {
private TextView main_post_title, main_post_content;
private ImageView main_post_image;
public DataViewHolder(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);
}
}
public static class ProgressViewHolder extends RecyclerView.ViewHolder {
public ProgressBar progressBar;
public ProgressViewHolder(View v) {
super(v);
progressBar = (ProgressBar) v.findViewById(R.id.progressBar1);
}
}
}
MainActivity 代码：
public class Main_page extends AppCompatActivity {
private static final long RIPPLE_DURATION = 250;
private Toolbar toolbar;
private RelativeLayout root;
private ImageView menu_image;
private RecyclerView main_recyclerView;
private MainAdapter2 mAdaper;
private List<MainDataModel> dataModels = new ArrayList<MainDataModel>();
private List<MainDataModel> dataModelsArray;
private Context context;
protected Handler handler;
private RelativeLayout loadLayout;
private LinearLayoutManager mLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_page);
if (!EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().register(this);
}
handler = new Handler();
context = getApplicationContext();
loadLayout = (RelativeLayout) findViewById(R.id.main_empty_layout);
toolbar = (Toolbar) findViewById(R.id.main_toolbar);
if (toolbar != null) {
setSupportActionBar(toolbar);
getSupportActionBar().setTitle(null);
}
LoadData();
mLayoutManager = new LinearLayoutManager(this);
// Menu
root = (RelativeLayout) findViewById(R.id.main_root);
View guillotineMenu = LayoutInflater.from(this).inflate(R.layout.menu_layout, null);
root.addView(guillotineMenu);
menu_image = (ImageView) toolbar.findViewById(R.id.toolbar_logo);
new GuillotineAnimation.GuillotineBuilder(guillotineMenu, guillotineMenu.findViewById(R.id.menu_layout_image), menu_image)
.setStartDelay(RIPPLE_DURATION)
.setActionBarViewForAnimation(toolbar)
.setClosedOnStart(true)
.build();
// RecyclerView and setData
main_recyclerView = (RecyclerView) findViewById(R.id.main_recycler);
main_recyclerView.setHasFixedSize(true);
main_recyclerView.setLayoutManager(mLayoutManager);
mAdaper = new MainAdapter2(this, main_recyclerView, dataModels);
main_recyclerView.setAdapter(mAdaper);
mAdaper.setOnLoadMoreListener(new OnLoadMoreListener() {
@Override
public void onLoadMore() {
}
});
}
@Subscribe
public void onEvent(List<MainDataModel> mainInfoModels) {
mAdaper.add(mainInfoModels);
if (dataModels.isEmpty()) {
main_recyclerView.setVisibility(View.GONE);
loadLayout.setVisibility(View.VISIBLE);
} else {
main_recyclerView.setVisibility(View.VISIBLE);
loadLayout.setVisibility(View.GONE);
}
}
private void LoadData() {
final MainDataInfo dataInfo = new MainDataInfo();
dataInfo.getMainDataInfo(this);
}
为了加载更多数据，我使用 Interface 类：OnLoadMoreListener
注意：我知道这个方法的名字是无穷无尽的！但我是业余爱好者，我不知道在mAdapter.setOnMoreListener 中编写代码来加载更多数据！请不要给我负分，帮助我，我真的需要你的帮助！谢谢大家
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