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리사이틀보기를 스크롤하는 동안 어댑터에서 더 많은 콘텐츠를로드하려고합니다. 구현했지만 작동하지 않습니다. 내 리사이클 러 뷰는 완벽하게 작동하지만 스크롤하는 동안 내 목록에서 나머지 내용을로드 할 수는 없습니다. 현재 내 코드에는 오류가 없습니다. 스크롤하는 동안 더 많은 항목을로드 할 수 없습니다. 도와주세요. 이것은 내 주요 활동입니다.스크롤에서 Android 리시버보기
public class Contact_school extends AppCompatActivity implements SearchView.OnQueryTextListener {
private List<Contact> Listcontact = new ArrayList<>();
Contacts_Adapter cadapter;
private RecyclerView rv;
public String GET_CONTACTS = "http://xyzx.com/Publicpages_mob/brief_school_details";
public Contact contact;
public String school_id;
String tag_json_obj = "json_obj_req";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact_school);
rv = (RecyclerView) findViewById(R.id.recycler_view);
preparelist();
cadapter = new Contacts_Adapter(Listcontact, rv);
final LinearLayoutManager layoutManager = new LinearLayoutManager(Contact_school.this);
rv.setLayoutManager(layoutManager);
rv.setItemAnimator(new DefaultItemAnimator());
rv.setAdapter(cadapter);
rv.setHasFixedSize(true);
cadapter.setOnLoadMoreListener(new OnLoadMoreListener() {
@Override
public void onLoadMore() {
Log.v(" KILILII ", "KITTTI");
//add null , so the adapter will check view_type and show progress bar at bottom
//// Listcontact.add(null);
//// cadapter.notifyItemInserted(Listcontact.size() - 1);
// remove progress item
//// Listcontact.remove(Listcontact.size() - 1);
//// cadapter.notifyItemRemoved(Listcontact.size());
// //add items one by one
int start = Listcontact.size();
int end = start + 20;
for (int i = start + 1; i <= end; i++) {
Listcontact.add(contact);
cadapter.notifyItemInserted(Listcontact.size());
}
cadapter.setLoaded();
//or you can add all at once but do not forget to call mAdapter.notifyDataSetChanged();
}
});
}
private void preparelist() {
final StringRequest strReq = new StringRequest(Request.Method.POST, GET_CONTACTS, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
Log.e("RESPONSE TEST", "" + jObj);
JSONArray jsonArray = jObj.getJSONArray("school_details");
Log.e("RESPONSE ARRAY", "" + jsonArray);
Log.d("SUCESS ", response);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonobject = jsonArray.getJSONObject(i);
contact = new Contact();
contact.setAddress(jsonobject.getString("school_address"));
contact.setRating(jsonobject.getString("school_rating"));
Listcontact.add(contact);
}
cadapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Error", "Registration Error: " + error.getMessage());
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
})
{
@Override
protected Map<String, String> getParams() {
// Posting params to register url
Map<String, String> params = new HashMap<String, String>();
return params;
}
};
AppController.getInstance().addToRequestQueue(strReq, tag_json_obj);
}
이이 내 모델 클래스
public class Contact implements Serializable {
private static final long serialVersionUID = 1L;
private String address,rating;
public Contact(){
}
public Contact (String address, String rating){
this.address = address;
this.rating= rating;
}
public String getAddress(){ return address;}
public String getRating(){return rating;}
public void setAddress(String ad){ this.address= ad;}
public void setRating(String ad){ this.rating= ad;}
}
내 어댑터 클래스
public class Contacts_Adapter extends RecyclerView.Adapter<Contacts_Adapter.MyViewHolder> {
private List<Contact> List1;
private final int VIEW_ITEM = 1;
private final int VIEW_PROG = 0;
private int visibleThreshold = 5;
private int lastVisibleItem, totalItemCount;
private boolean loading;
private OnLoadMoreListener onLoadMoreListener;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView text_address,text_rating;
public MyViewHolder(View view) {
super(view);
text_address = (TextView)view.findViewById(R.id.textaddress);
text_rating = (TextView)view.findViewById(R.id.textrating);
}
}
public Contacts_Adapter(List<Contact> List1,RecyclerView recyclerView)
{
this.List1 = List1;
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 List1.get(position) != null ? VIEW_ITEM : VIEW_PROG;
}
@Override
public Contacts_Adapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recycler, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
Contact c = List1.get(position);
holder.text_rating.setText("Rating "+c.getRating());
holder.text_address.setText(c.getAddress());
}
public void setLoaded() {
loading = false;
}
public void setOnLoadMoreListener(OnLoadMoreListener onLoadMoreListener) {
this.onLoadMoreListener = onLoadMoreListener;
}
내가
public interface OnLoadMoreListener {
void onLoadMore();
}
이
도와주세요,이 인터페이스를 가지고 0
이 코드를 사용할 때 "java.lang.IllegalStateException : RecyclerView가 레이아웃 또는 스크롤을 계산하는 동안이 메서드를 호출 할 수 없습니다." – Bivin
실행할 수없는 메서드는 무엇입니까? –