我有一個recyclerview即得到第10個項目,當我滾動下來,有時它得到了別人,有時不是:recyclerview有時會在滾動的數據,有時不
item 22
item 21
item 20
item 19
item 18
item 17
item 16
item 15
item 14
item 13
usually it stops at item 13. (not getting the onscroll items)
,但有時它的工作原理,並得到其他(12,11,10,9,8,7,6,5,4,3,2,1 ...)
我的滾動碼:
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
if (isLastItemDisplaying(recyclerView)) {
getData();
}
}
});
獲取數據:
private void getData() {
requestQueue.add(getDataFromServer(requestCount, user_id));
}
的GetData服務器
private JsonArrayRequest getDataFromServer(String requestCount, String user_id) {
//Initializing ProgressBar
final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
//Displaying Progressbar
progressBar.setVisibility(View.VISIBLE);
requestCount = requestCount + "&user=" + user_id;
//JsonArrayRequest of volley
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Config.DATA_URL + String.valueOf(requestCount),
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
//Calling method parseData to parse the json response
parseData(response);
//Hiding the progressbar
progressBar.setVisibility(View.GONE);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressBar.setVisibility(View.GONE);
//If an error occurs that means end of the list has reached
Toast.makeText(UserAreaActivity.this, "No More Items Available", Toast.LENGTH_SHORT).show();
}
});
//Returning the request
return jsonArrayRequest;
}
檢查最後一個項目
//This method would check that the recyclerview scroll has reached the bottom or not
private boolean isLastItemDisplaying(RecyclerView recyclerView) {
if (recyclerView.getAdapter().getItemCount() != 0) {
int lastVisibleItemPosition = ((LinearLayoutManager) recyclerView.getLayoutManager()).findLastCompletelyVisibleItemPosition();
if (lastVisibleItemPosition != RecyclerView.NO_POSITION && lastVisibleItemPosition == recyclerView.getAdapter().getItemCount() - 1)
return true;
}
return false;
}
爲什麼它有時又何妨什麼想法嗎?
---------------------------->編輯
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
//Imageloader to load image
private ImageLoader imageLoader;
private final Context context;
//List to store all posts
List<Posts> Posts;
//Constructor of this class
public CardAdapter(List<Posts> Post, Context context){
super();
//Getting all
this.Posts = Post;
this.context = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.posts_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Posts post = Posts.get(position);
holder.post = post;
//Loading image from url
//imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
//Showing data on the views
//holder.imageView.setImageUrl(post.getImageUrl(), imageLoader);
Picasso.with(context).load(post.getImageUrl()).into(holder.imageView);
holder.textViewName.setText(post.getName());
holder.textViewPublisher.setText(post.getPublisher());
holder.setIsRecyclable(false);
}
@Override
public int getItemCount() {
return Posts.size();
}
class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
//Views
public ImageView imageView;
public TextView textViewName;
public TextView textViewPublisher;
public Posts post;
public ImageView ProfilePic;
//Initializing Views
public ViewHolder(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.imageViewHero);
textViewName = (TextView) itemView.findViewById(R.id.textViewName);
textViewPublisher = (TextView) itemView.findViewById(R.id.textViewPublisher);
}
@Override
public void onClick(View v) {
//...
}
}
}
}
--------- --------------------------------編輯2
private JsonArrayRequest getDataFromServer(String requestCount, String user_id) {
//Initializing ProgressBar
final ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar1);
//Displaying Progressbar
progressBar.setVisibility(View.VISIBLE);
requestCount = requestCount + "&user=" + user_id;
//JsonArrayRequest of volley
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Config.DATA_URL + String.valueOf(requestCount),
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
//Calling method parseData to parse the json response
parseData(response);
//Hiding the progressbar
progressBar.setVisibility(View.GONE);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
progressBar.setVisibility(View.GONE);
//If an error occurs that means end of the list has reached
Toast.makeText(UserAreaActivity.this, "No More Items Available", Toast.LENGTH_SHORT).show();
}
});
//Returning the request
return jsonArrayRequest;
}
//This method will get data from the web api
private void getData() {
//Adding the method to the queue by calling the method getDataFromServer
requestQueue.add(getDataFromServer(requestCount, user_id));
//Incrementing the request counter
//requestCount++;
}
//This method will parse json data
private void parseData(JSONArray array) {
for (int i = 0; i < array.length(); i++) {
//Creating the object
Posts PostObj = new Posts();
JSONObject json = null;
try {
//Getting json
json = array.getJSONObject(i);
//Adding data to the object
PostObj.setImageUrl(json.getString(Config.TAG_IMAGE_URL));
PostObj.setName(json.getString(Config.TAG_NAME));
PostObj.setPublisher(json.getString(Config.TAG_PUBLISHER));
requestCount = PostObj.setId(json.getString(Config.TAG_ID));
} catch (JSONException e) {
e.printStackTrace();
}
//Adding object to the list
listPosts.add(PostObj);
}
//Notifying the adapter that data has been added or changed
adapter.notifyDataSetChanged();
}
活動或片段中的recyclerview? – Cochi
@科奇這是一個活動 –
Thx,你可以在哪裏更新你的回收視圖適配器的代碼? – Cochi