我正在开发献血应用程序。用户需要选择血型和地区，并且如果他/她按下搜索按钮，则该应用需要显示带有“加载更多”选项的RecyclerView。我需要传递血型ID，地区ID以及计数和索引。在这里，索引应按计数增加。我进行了搜索，但未获得任何明确的解决方案。
请检查我的代码索引未按预期方式增加。
HomeActivity
public class Home`Activity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
groupSpin=findViewById(R.id.group_spinner);
distSpin=findViewById(R.id.district_spinner);
talukSpin=findViewById(R.id.taluk_spinner);
search=findViewById(R.id.searchGroup_button);
recycleList=findViewById(R.id.searchList);
progress=findViewById(R.id.progressBar);
text=findViewById(R.id.text_noData);
service = ApiClient.createService(ApiCall.class, HomeActivity.this);
pDialog=new ProgressDialog(HomeActivity.this);
pDialog.setMessage("Loading..");
pDialog.setCancelable(false);
pDialog.show();
getBloodGroups();
getDistrict();
search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(groupSpin.getText().toString().isEmpty() && distSpin.getText().toString().isEmpty()){
// groupSpin.setError("Blood group field is required");
}
else{
setRecyclerViewPagination();
}
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
private RecyclerView.OnScrollListener recycleOnScroll=new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) {
isLoading = true;
}
}
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
visibleItemCount= layoutManager.getChildCount();
totalItemCount= layoutManager.getItemCount();
firstVisibleItems= layoutManager.findFirstVisibleItemPosition();
if(isLoading && totalItemCount>previous_total )
{
isLoading=false;
previous_total=totalItemCount;
}
if(!isLoading && (totalItemCount-visibleItemCount)<=(firstVisibleItems+count))
{
index = index + count;
getSearches(count,index);
isLoading = true;
}
}
};
private void getBloodGroups() {
service= ApiClient.createService(ApiCall.class,HomeActivity.this);
Call<BloodGroupModel> call=service.getGroups();
call.enqueue(new Callback<BloodGroupModel>() {
@Override
public void onResponse(Call<BloodGroupModel> call, Response<BloodGroupModel> response) {
if(response.body() != null && response.body().getStatus() != null && response.body().getStatus()){
pDialog.dismiss();
Toast.makeText(getApplicationContext(),response.body().getMessage(),Toast.LENGTH_LONG).show();
Log.d("Message",response.body().getMessage());
listblood = response.body().getData();
larray=new ArrayList<>();
groupSpin=findViewById(R.id.group_spinner);
for(int i=0;i<listblood.size();i++){
larray.add(listblood.get(i).getBloodGroupName());
Log.d("list",larray.toString());
}
groupSpin.setAdapter(new ArrayAdapter<String>(HomeActivity.this,android.R.layout.simple_spinner_dropdown_item,larray));
groupSpin.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
groupId=listblood.get(position).getBloodGroupId();
}
});
}else{
pDialog.dismiss();
Toast.makeText(getApplicationContext(),"Failed",Toast.LENGTH_LONG).show();
}
}
@Override
public void onFailure(Call<BloodGroupModel> call, Throwable t) {
pDialog.dismiss();
Toast.makeText(getApplicationContext(),"Check your Internet Connection!!", Toast.LENGTH_SHORT).show();
Log.d("Issue",t.getMessage());
}
});
}
private void getDistrict() {
service= ApiClient.createService(ApiCall.class,HomeActivity.this);
Call<DistrictModel> call=service.getdistricts();
call.enqueue(new Callback<DistrictModel>() {
@Override
public void onResponse(Call<DistrictModel> call, Response<DistrictModel> response) {
if(response.body() != null && response.body().getStatus() != null && response.body().getStatus()){
Toast.makeText(getApplicationContext(),response.body().getMessage(),Toast.LENGTH_LONG).show();
Log.d("Message",response.body().getMessage());
listdistrict=response.body().getData();
distSpin=findViewById(R.id.district_spinner);
darray=new ArrayList<>();
for(int i=0;i<listdistrict.size();i++){
disId=listdistrict.get(i).getDistrictId();
darray.add(listdistrict.get(i).getDistrict());
Log.d("list",darray.toString());
}
distSpin.setAdapter(new ArrayAdapter<String>(getBaseContext(),android.R.layout.simple_spinner_dropdown_item,darray));
distSpin.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d(" selected spinner ", String.valueOf(position));
getDistrictId(position);
}
});
}
else{
Toast.makeText(getApplicationContext(),"Failed",Toast.LENGTH_LONG).show();
}
}
@Override
public void onFailure(Call<DistrictModel> call, Throwable t) {
Toast.makeText(getApplicationContext(), "Check your Internet Connection!!", Toast.LENGTH_SHORT).show();
Log.d("Issue",t.getMessage());
}
});
}
private void getDistrictId(int position) {
String district_id="";
try {
district_id = listdistrict.get(position).getDistrictId();
disId = district_id;
getTaluks(district_id);
talukSpin.getText().clear();
}catch (Exception e){
Log.d("Exception",e.toString());
}
}
private void getTaluks(String district_id) {
ProgressDialog pDialog=new ProgressDialog(HomeActivity.this);
pDialog.setMessage("Loading Taluks..");
pDialog.setCancelable(false);
pDialog.show();
tarray = new ArrayList<>();
service=ApiClient.createService(ApiCall.class,HomeActivity.this);
Call<TalukModel> call=service.getTaluk(district_id);
call.enqueue(new Callback<TalukModel>() {
@Override
public void onResponse(Call<TalukModel> call, Response<TalukModel> response) {
if (response.body() != null && response.body().getStatus() != null && response.body().getStatus()) {
pDialog.dismiss();
Log.d("Message", response.body().getMessage());
listtaluk = response.body().getData();
talukSpin = findViewById(R.id.taluk_spinner);
for (int i = 0; i < listtaluk.size(); i++) {
tarray.add(listtaluk.get(i).getTalukName());
Log.d("list", tarray.toString());
}
talukSpin.setAdapter(new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_spinner_dropdown_item, tarray));
talukSpin.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.d("BloodGroup ", String.valueOf(position));
talukId=listtaluk.get(position).getTalukId();
}
});
}
}
@Override
public void onFailure(Call<TalukModel> call, Throwable t) {
pDialog.dismiss();
Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
Log.d("Issue",t.getMessage());
}
});
}
private void setRecyclerViewPagination() {
index=0;
dataList = new ArrayList<>();
sadapter=new SearchAdapter(HomeActivity.this,dataList);
layoutManager = new LinearLayoutManager(HomeActivity.this, LinearLayoutManager.VERTICAL, false);
recycleList.setNestedScrollingEnabled(false);
recycleList.setLayoutManager(layoutManager);
recycleList.setHasFixedSize(true);
recycleList.setAdapter(sadapter);
getSearches(count,index);
recycleList.addOnScrollListener(recycleOnScroll);
}
private void getSearches(final int count,final int index) {
final boolean isFirstPage=index == 0 ? true : false;
if(isFirstPage)
progress.setVisibility(View.VISIBLE);
Call<SearchModel> call = service.getSearchResult(groupId, disId, talukId, count, index);
call.enqueue(new Callback<SearchModel>() {
@Override
public void onResponse(Call<SearchModel> call, Response<SearchModel> response) {
try {
if (response.body() != null && response.body().getStatus() != null && response.body().getStatus()) {
text.setVisibility(View.GONE);
List<SearchData> data = new ArrayList<>();
if (response.body().getData() != null) {
data = response.body().getData();
if (isFirstPage)
dataList.clear();
dataList.addAll(data);
sadapter.notifyDataSetChanged();
}
if (data.size() > 0) {
isLoading = true;
} else {
isLoading = false;
}
}
else
{
isLoading=false;
// recycleList.setVisibility(View.GONE);
text.setVisibility(View.VISIBLE);
}
progress.setVisibility(View.GONE);
}catch(Exception e){
Log.e("Issue","Error"+e.toString());
isLoading=false;
}
}
@Override
public void onFailure(Call<SearchModel> call, Throwable t) {
Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_LONG).show();
isLoading=false;
}
});
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.home, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_user) {
Intent i=new Intent(getApplicationContext(),RegisterActivity.class);
startActivity(i);
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_home) {
Intent i=new Intent(getApplicationContext(),HomeActivity.class);
startActivity(i);
} else if (id == R.id.nav_about) {
} else if (id == R.id.nav_register) {
Intent r=new Intent(getApplicationContext(),RegisterActivity.class);
startActivity(r);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}}
SearchAdapter.java
public class SearchAdapter extends RecyclerView.Adapter<SearchAdapter.ViewHolder> {
private Context context;
private List<SearchData> sdata;
public SearchAdapter(Context context,List<SearchData> sdata){
this.context=context;
this.sdata=sdata;
}
@NonNull
@Override
public SearchAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.list_searchresults, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull SearchAdapter.ViewHolder viewHolder, int i) {
final SearchData sd=sdata.get(i);
viewHolder.name.setText(sd.getName());
viewHolder.phone.setText(sd.getPhone());
viewHolder.email.setText(sd.getEmail());
viewHolder.dist.setText(sd.getDistrict());
viewHolder.taluk.setText(sd.getTalukName());
viewHolder.bgroup.setText(sd.getBloodGroupName());
}
@Override
public int getItemCount() {
return sdata.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
TextView name,phone,dist,taluk,email,bgroup;
public ViewHolder(@NonNull View itemView) {
super(itemView);
name=itemView.findViewById(R.id.list_names);
phone=itemView.findViewById(R.id.list_phones);
dist=itemView.findViewById(R.id.list_districts);
taluk=itemView.findViewById(R.id.list_taluks);
email=itemView.findViewById(R.id.list_emails);
bgroup=itemView.findViewById(R.id.list_groups);
}
}}