how to Update ListView after deletion - android-studio

Here I'm using Custom Adapter by implementing listAdapter to Support buttons in the list items. When i click the Delete button it deletes currect row. But i can't able to refresh this listView.
File Structure is MainActivity -> FragmentClass-> this Custom class for the listAdpater.
public class Category_ListView_Custom_Adapter extends BaseAdapter implements ListAdapter{
private Realm realm;
private ArrayList<String> list = new ArrayList<>();
private Context context;
public Category_ListView_Custom_Adapter(ArrayList<String> list, Context context){
this.list = list;
this.context = context;
}
#Override
public int getCount() {
return list.size();
}
#Override
public Object getItem(int i) {
return list.get(i);
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(final int i, View view, ViewGroup viewGroup) {
View view1 = view;
realm = Realm.getDefaultInstance();
if(view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.category_listview_row, null);
}
TextView listItemText = (TextView) view.findViewById(R.id.item);
listItemText.setText(list.get(i));
ImageView edit = (ImageView) view.findViewById(R.id.image);
ImageView delete = (ImageView) view.findViewById(R.id.delete);
edit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// list.remove(i);
/// Toast.makeText(view.getContext(), "hey "+list.get(i).toString(), Toast.LENGTH_SHORT).show();
// notifyDataSetChanged();
Intent intent = new Intent(context, AddCategory.class);
intent.putExtra("category","expense");
intent.putExtra("subcategory", list.get(i));
context.startActivity(intent);
}
});
delete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
RealmResults<Category> categorylist = realm.where(Category.class).equalTo("Id",i+1).and().equalTo("Subcategory",list.get(i)).findAll();
for (Category category : categorylist) {
realm.beginTransaction();
categorylist.deleteFirstFromRealm();
realm.commitTransaction();
try {
context.notifyAll();
}catch (Exception e){
Toast.makeText(context, e.toString(), Toast.LENGTH_SHORT).show();
}
// Expense.call_resume
}
}
});
return view;
}
}
Please Help me. Thank you.

You are .removing from a wrong view. Try to make root List<> static and do Class.list.get(i).remove or something like that.
Also, try to hide a view inside your get view.

Related

NotifyDataSetChanged() not updating listview after closing alert dialog

In my adapter class I have created a alert dialog and added a update button to it which allows me to update the items on my list view, it updates my listview but only when I leave the page and return back to it, I have used notifydatasetchanged but it doesn't seem to work, I want it to update on the list view immediately after the dialog closing.
update button
viewHolder.btnDisplayUpdate.setText("Update");
viewHolder.btnDisplayUpdate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
updateCrime(crimes);
}
});
Update method
private void updateCrime(CrimesDelete crimes){
AlertDialog.Builder popupWindow = new AlertDialog.Builder(context);
LayoutInflater inflater = LayoutInflater.from(context);
View root = inflater.inflate(R.layout.dialog_update, null);
popupWindow.setView(root);
AlertDialog alertDialog = popupWindow.create();
alertDialog.show();
editLocation = (EditText)root.findViewById(R.id.editText_location);
editType = (EditText)root.findViewById(R.id.editText_type);
editDescription = (EditText)root.findViewById(R.id.editText_description);
editDate = (EditText)root.findViewById(R.id.textViewDate);
editTime = (EditText)root.findViewById(R.id.textViewTime);
Spinner spinner = (Spinner) root.findViewById(R.id.editText_rating);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
getContext(), R.array.rating, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
public void onItemSelected(AdapterView<?> parent,
View view, int pos, long id) {
editRating = parent.getItemAtPosition(pos).toString();
if (pos==0){
editRating = null;
}
}
public void onNothingSelected(AdapterView<?> parent) {
}
});
editLocation.setText(crimes.getLOCATION());
editType.setText(crimes.getTYPE());
editDescription.setText(crimes.getDESCRIPTION());
editDate.setText(crimes.getDATE());
editTime.setText(crimes.getTIME());
root.findViewById(R.id.btnAdd).setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view){
String location = editLocation.getText().toString().trim();
String type = editType.getText().toString().trim();
String description = editDescription.getText().toString().trim();
String date = editDate.getText().toString().trim();
String time = editTime.getText().toString().trim();
String rating = spinner.getSelectedItem().toString().trim();
DB_CRIME.updateDate(crimes.getID(), location, type, description, date, time, rating);
loadUpdatedCrimes();
alertDialog.dismiss();
}
});
}
private void loadUpdatedCrimes() {
notifyDataSetChanged();
Toast.makeText(getContext(), "Crime has been Updated" , Toast.LENGTH_SHORT).show();
}

Hide Button if not data in recyclerview

I had created a app in which i have multiple edittext and one buttonwith recyclerviuew and one button which are setvisibilty as Gone.On Button click it add all my data in my recyclerview list with by chnaging visibality of my recycelr view and my button.In my Custom Adapter i am using a image view to delete the item from postion now i want that if it delete all data from list then it should automatically hide my Button and recyclerview.
//Recycler_view Adapter
public class Myviewholder extends RecyclerView.ViewHolder {
public TextView land_Detail, area_detail, s_no1;
public Button delete;
public Myviewholder(View view) {
super(view);
land_Detail = view.findViewById(R.id.hint31);
area_detail = view.findViewById(R.id.hint21);
s_no1 = view.findViewById(R.id.hint11);
delete = view.findViewById(R.id.hint41);
}
}
public Land_adapters(List<Land_list> land_list, Context context) {
this.laand_list = land_list;
this.context = context;
}
#NonNull
#Override
public Land_adapters.Myviewholder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.land_list, parent, false);
return new Myviewholder(itemView);
}
#Override
public void onBindViewHolder(#NonNull Myviewholder holder, final int position) {
final Land_list current_year = laand_list.get(position);
holder.area_detail.setText("District :" + current_year.getDistrict_name() + "\n" + "Village :" + current_year.getVillage_name());
holder.s_no1.setText(String.valueOf(position + 1));
holder.land_Detail.setText("Acre :" + current_year.getAcre() + "\n" + "Kanal :" + current_year.getKanal() + "\n" + "Marla :" + current_year.getMarla());
holder.delete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, "", Toast.LENGTH_SHORT).show();
Land_list theRemovedItem = laand_list.get(position);
// remove your item from data base
laand_list.remove(position); // remove the item from list
notifyItemRemoved(position); // notify the adapter about the removed item
}
});
}
#Override
public int getItemCount() {
return laand_list.size();
}
//how i am using my recycler in mainactivity class
public void final_step() {
// marla_edit.setError(null);
recyclerView = findViewById(R.id.recycler_view_last1);
mAdapter1 = new Land_Adapter(last_Year1);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setAdapter(mAdapter1);
Land_list last_year1 = new Land_list(land_acre, land_kanal, village_selected1, land_marla, district_selected1, teshil_selected1, block_selected1, block_code, teshil_code1, village_code1, district_code);
last_Year1.add(last_year1);
mAdapter1.notifyDataSetChanged();
if (!(last_Year1.size() == 0)) {
RelativeLayout linearLayout = findViewById(R.id.linear123);
recyclerView.setVisibility(View.VISIBLE);
next_button.setVisibility(View.VISIBLE);
}
else
{
next_button.setVisibility(View.INVISIBLE);
}
// i just want that when it press delete image in recycelr view it should hide my button automatically.
you can use an interface to inform the fragment/activity, the list is empty.
Adapter like as below:
public class CustomAdapter extends RecyclerView.Adapter<CustomViewHolder> {
AdapterListener listener;
public void setListener(AdapterListener listener) {
this.listener = listener;
}
...
#Override
public void onBindViewHolder(#NonNull Myviewholder holder, final int position) {
...
holder.delete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
...
// remove your item from data base
laand_list.remove(position); // remove the item from list
notifyItemRemoved(position); // notify the adapter about the removed item
if (laand_list.size()==0)
listener.onDataListIsEmpty();
}
});
}
public interface AdapterListener {
void onDataListIsEmpty();
}
}
The Activity/Fragment like as below:
class MyActivity extends Activity implements CustomAdapter.AdapterListener {
CustomAdapter adapter;
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
adapter = new CustomAdapter();
adapter.setListener(this);
...
}
#Override
public void onDataListIsEmpty() {
// set visible or gone views
}
}

behavior explanation: Using LiveData to update adapter with DiffUtil

I am updating my recyclerview by using LiveData as below:
viewModel = ViewModelProviders.of(getActivity()).get(MyViewModel.class);
viewModel.getPurchaseList().observe(getViewLifecycleOwner(), new Observer<List<ProductsObject>>() {
#Override
public void onChanged(#Nullable List<ProductsObject> productsObjects) {
adapter.submitList(productsObjects);
//adapter.notifyDataSetChanged();
}
});
And I am using a FloatActionButton to change the value of my MutableLiveData as below:
FloatingActionButton fab = view.findViewById(R.id.cart_fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
viewModel.setPurchasePrice(0, 101.2);
}
});
All the data gets changed and onChanged is called as expected, but it only updates my recyclerview when I enable the adapter.notifyDataSetChanged();
If I create a new ProductsObject inside the FAB and submit a new list, the recyclerview gets updated without calling adapter.notifyDataSetChanged(); as below:
FloatingActionButton fab = view.findViewById(R.id.cart_fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//viewModel.setPurchaseAmount(0, 101.2);
ProductsObject prod = new ProductsObject("6666", 5, 152.2, "new product");
List<ProductsObject> prodList = new ArrayList<>();
prodList.add(prod);
adapter.submitList(prodList);
}
});
I appreciate if anyone could explain why.
Here is my adapter:
public class CartFragAdapter extends RecyclerView.Adapter<CartFragAdapter.CartFragViewHolder> {
private static final String TAG = "debinf PurchaseAdap";
private static final DiffUtil.ItemCallback<ProductsObject> DIFF_CALLBACK = new DiffUtil.ItemCallback<ProductsObject>() {
#Override
public boolean areItemsTheSame(#NonNull ProductsObject oldProduct, #NonNull ProductsObject newProduct) {
Log.i(TAG, "areItemsTheSame: old is "+oldProduct.getCode()+" ; new is "+newProduct.getCode());
return oldProduct.getCode().equals(newProduct.getCode());
}
#Override
public boolean areContentsTheSame(#NonNull ProductsObject oldProduct, #NonNull ProductsObject newProduct) {
Log.i(TAG, "areContentsTheSame: old is "+oldProduct.getPrice()+" ; new is "+newProduct.getPrice());
return oldProduct.getPrice() == newProduct.getPrice();
}
};
private AsyncListDiffer<ProductsObject> differ = new AsyncListDiffer<ProductsObject>(this, DIFF_CALLBACK);
#NonNull
#Override
public CartFragViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_purchase, parent, false);
return new CartFragViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull CartFragViewHolder holder, int position) {
final ProductsObject purchaseList = differ.getCurrentList().get(position);
holder.mCode.setText(purchaseList.getCode());
holder.mPrice.setText(String.valueOf(purchaseList.getPrice()));
holder.mDescription.setText(purchaseList.getDescription());
}
#Override
public int getItemCount() {
Log.i(TAG, "getItemCount");
return differ.getCurrentList().size();
}
public void submitList(List<ProductsObject> products){
Log.i(TAG, "submitList: products.size is "+products.size());
differ.submitList(products);
}
public class CartFragViewHolder extends RecyclerView.ViewHolder {
public TextView mCode, mPrice, mDescription;
public CartFragViewHolder(#NonNull View itemView) {
super(itemView);
mCode = (TextView) itemView.findViewById(R.id.item_productCode);
mPrice = (TextView) itemView.findViewById(R.id.item_productPrice);
mDescription = (TextView) itemView.findViewById(R.id.item_productDescription);
}
}
}
And here is my ViewModel:
public class MyViewModel extends ViewModel {
MutableLiveData<List<ProductsObject>> purchaseList = new MutableLiveData<>();
public LiveData<List<ProductsObject>> getPurchaseList() {
return purchaseList;
}
public void setPurchasePrice(int position, double price) {
List<ProductsObject> itemList = purchaseList.getValue();
if (itemList != null && itemList.get(position) != null) {
Log.i("debinf ViewModel", "setPurchaseAmount: "+itemList.get(position).getPrice());
itemList.get(position).setPrice(price);
purchaseList.postValue(itemList);
}
}
}
AsyncListDiffer saves only the reference of the list. This means that if you submit a modified list instead of submitting a new list, AsncListDiffer won't be able to detect any difference because both the previous list and the new list are referencing the same list with the same items.
To fix this you need to create a new list and new item. Change MyViewModel#setPurchasePrice as below:
public void setPurchasePrice(int position, double price) {
List<ProductsObject> itemList = purchaseList.getValue();
if (itemList != null && itemList.get(position) != null) {
List<ProductsObject> newList = new ArrayList<>();
for (int i = 0; i < itemList.size(); i++) {
ProductsObject prevProd = itemList.get(i);
if (i != position) {
newList.add(prevProd);
} else {
ProductsObject newProd = new ProductsObject(..., price, ...);
newList.add(newProd);
}
}
purchaseList.postValue(newList);
}
}

How to implement onActivityResult within RecyclerView Fragment

I am trying to have a button within a Tab which is part of an activity for uploading images, when clicking the button inside one of the 2 Tabs presented in the activity ( Tab 1 pics, Tab 2 Vid ) the user could choose an image from the device.
My problem is implemneting the onClick Listener and onActivityResult which is not being used when placed after onClick, plus the #Override is being underlined as an error.
I guess i am not implementing the onClick the right way and not sure how to activate onActivityResult the proper way, i would appreciate any guidance;
MainActivty;
public class upload extends AppCompatActivity {
public String UserID;
private static final int REQUEST_SIGNUP = 0;
private DrawerLayout mDrawerLayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.upload);
Firebase.setAndroidContext(this);
// Adding Toolbar to Main screen
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Setting ViewPager for each Tabs
ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
// Set Tabs inside Toolbar
TabLayout tabs = (TabLayout) findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
Adapter adapter = new Adapter(getSupportFragmentManager());
adapter.addFragment(new UploadPictures(), "Pictures");
adapter.addFragment(new UploadVideos(), "Videos");
viewPager.setAdapter(adapter);
}
static class Adapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public Adapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
And here is the Fragment Code;
public class UploadPictures extends android.support.v4.app.Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final RecyclerView recyclerView = (RecyclerView) inflater.inflate(
R.layout.recycler_view, container, false);
ContentAdapter adapter = new ContentAdapter(recyclerView.getContext());
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return recyclerView;
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public ImageView picture;
public EditText tagEditText;
public Button tagCurLoc, choosePic, uploadContent;
public ViewHolder(LayoutInflater inflater, ViewGroup parent) {
super(inflater.inflate(R.layout.pictue_upload, parent, false));
picture = (ImageView) itemView.findViewById(R.id.imgToUpload);
tagEditText = (EditText) itemView.findViewById(R.id.tagEditText);
tagCurLoc = (Button) itemView.findViewById(R.id.tagCurLoc);
choosePic = (Button) itemView.findViewById(R.id.choosePic);
choosePic.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent galleryIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, RESULT_LOAD_IMAGE);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (data == null) {
onActivityResult(requestCode, resultCode, data);
Toast.makeText(getActivity().getApplicationContext(), "Canceled ", Toast.LENGTH_SHORT).show();
} else {
if (requestCode == RESULT_LOAD_IMAGE) {
Uri selectedImgPath = data.getData();
picture.setImageURI(selectedImgPath);
RealFilePath = Uri.parse(String.valueOf(selectedImgPath));
Toast.makeText(getActivity().getApplicationContext(), " " + RealFilePath, Toast.LENGTH_SHORT).show();
}
}
}
});
uploadContent = (Button) itemView.findViewById(R.id.uploadContent);
}
}
/**
* Adapter to display recycler view.
*/
public class ContentAdapter extends RecyclerView.Adapter<ViewHolder> {
// Set numbers of List in RecyclerView.
private Context mContext;
public ContentAdapter(Context context) {
this.mContext = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new ViewHolder(LayoutInflater.from(parent.getContext()), parent);
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
}
#Override
public int getItemCount() {
return LENGTH;
}
}
Not sure if the onClick listener for the button should be implemented in the Adapter or the View holder, and from there the issue of onActivityResult cant be used ?
Weel, solved after some more reading and few try outs.
The onClick listener should be implemented at the ViewHolder class followed by
#Override
onActivityResult.
within the onClickListener onActivityResult invoked by;
startActivityForResult(intent, RESULT_LOAD_IMAGE);
and within onActivityResult;
onActivityResult(requestCode, resultCode, data);
Considering all of this taking place in an activity extending Fragment.

Hashmap order inside the expandable listview varies from device to another

Now i'm making an application that it should display a list of courses in an expandable list view and when the user clicks on a child element it opens a new activity with the course details , everything works pretty fine but , when i tested the application through nexus the order of the courses was the same i put inside the hashmap and in the switch case statement but when i tested it through my galaxy not two here it came the disaster the orders in the list were scrambled so the click event got messed up when supposed to open course details for x it opens for y and so on ,,, what should i do ?
THIS IS THE MAIN
public class Courses extends ActionBarActivity {
HashMap<String,List<String>> Courses_castegory;
List<String> Courses_list;
ExpandableListView expandableListView;
MyCourseAdapter myCourseAdapter;
Intent detaledActivity;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_courses);
expandableListView = (ExpandableListView) findViewById(R.id.simple_expandable_list);
Courses_castegory = CourseProvider.getInfo();
Courses_list=new ArrayList<>(Courses_castegory.keySet());//get all the keys from the hashmap
myCourseAdapter = new MyCourseAdapter(this,Courses_castegory,Courses_list);
expandableListView.setAdapter(myCourseAdapter);
expandableListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {
#Override
public void onGroupCollapse(int groupPosition) {
Toast.makeText(getBaseContext(), Courses_list.get(groupPosition) + " is collapsed", Toast.LENGTH_SHORT).show();
}
});
expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
#Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
//Toast.makeText(getBaseContext(),
//Courses_castegory.get(Courses_list.get(groupPosition)).get(childPosition)+" from "+Courses_list.get(groupPosition)+" is selected",Toast.LENGTH_SHORT).show();
switch(groupPosition) {
case 0:
switch (childPosition) {
case 0:
detaledActivity = new Intent(Courses.this, DetailedCouse.class);
startActivity(detaledActivity);
break;
}
}
return true;
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_courses, 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_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
THIS IS THE COURSE PROVIDER
public class CourseProvider {
public static HashMap<String,List<String>> getInfo(){
HashMap<String,List<String>>CourseDetails = new HashMap<String,List<String>>();
List<String> CourseType1 = new ArrayList<>();
CourseType1.add("English For Work");
List<String> CourseType2= new ArrayList<>();
CourseType2.add("General English For Work");
CourseType2.add("Intensive English For Work");
List<String> CourseType3 = new ArrayList<>();
CourseType3.add("English Academic Year");
CourseType3.add("English Academic Semester");
List<String> CourseType4 = new ArrayList<>();
CourseType4.add("IELTS Exam Preparation");
CourseType4.add("TOEFL Exam Preparation");
CourseType4.add("GMAT Exam Preparation");
CourseType4.add("GRE Exam Preparation");
List<String> CourseType5 = new ArrayList<>();
CourseType5.add("Young Learners");
List<String> CourseType6 = new ArrayList<>();
CourseType6.add("General English Language");
CourseType6.add("Intensive English Language");
CourseType6.add("30+");
CourseDetails.put("Learn English in Your Teacher's Home",CourseType1);
CourseDetails.put("English For Work",CourseType2);
CourseDetails.put("Academic Semester / Year",CourseType3);
CourseDetails.put("Exam Preparation Courses",CourseType4);
CourseDetails.put("Young Learners",CourseType5);
CourseDetails.put("Flexible Courses",CourseType6);
return CourseDetails;
}}
AND THIS IS THE COURSE ADAPTER
public class MyCourseAdapter extends BaseExpandableListAdapter {
private Context context;
private HashMap<String,List<String>>Courses_Category;
private List<String> Course_List ;
public MyCourseAdapter(Context context ,HashMap<String,List<String>>Courses_Category,List<String> Course_List) {
this.context=context;
this.Courses_Category=Courses_Category;
this.Course_List=Course_List;
}
#Override
public int getGroupCount() {
return Course_List.size();
}
#Override
public int getChildrenCount(int groupPosition) {
return Courses_Category.get(Course_List.get(groupPosition)).size();
}
#Override
public Object getGroup(int groupPosition) {
return Course_List.get(groupPosition);
}
#Override
public Object getChild(int parent, int child) {
return Courses_Category.get(Course_List.get(parent)).get(child);
}
#Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
#Override
public long getChildId(int parent, int child) {
return child;
}
#Override
public boolean hasStableIds() {
return false;
}
#Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
String group_title = (String) getGroup(groupPosition);
if (convertView==null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.parent_courses,parent,false);
}
TextView parent_textview = (TextView) convertView.findViewById(R.id.parent_text_view);
parent_textview.setTypeface(null, Typeface.BOLD);
parent_textview.setText(group_title);
return convertView;
}
#Override
public View getChildView(final int parentPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
String child_title = (String) getChild(parentPosition,childPosition);
if (convertView==null){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView=inflater.inflate(R.layout.child_courses,parent,false);
}
TextView child_textview = (TextView) convertView.findViewById(R.id.child_text_view);
child_textview.setText(child_title);
return convertView;
}
#Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
public void onGroupCollapsed(int groupPosition){
super.onGroupCollapsed(groupPosition);
}
public void onGroupExpanded(int groupPosition){
super.onGroupExpanded(groupPosition);
}}
//
Done using LinkedHashMapinstead of HashMap

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