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I am using a Custom ArrayAdapter to store User information for example sammy, robert, lizie are each one User objects and i am using a User type ArrayList to store all the User objects to ArrayList.

And because it is not a string or int (The ArrayList) the default getFilter does not work, and i have done my research but it is really confusing how the getFilter method works so i can modify myself.

I want to implement the searching based on the name property form the User class

I know i have to implement the Filterable interface in my CustomAdapter class, but the getFilter is really unintuitive.

Here is my CustomAdapter

class CustomArrayAdapter extends ArrayAdapter<User> implements Filterable 


 CustomArrayAdapter(@NonNull Context context, ArrayList<User> users) 
 super(context, 0, users);
 

 @NonNull
 @Override
 public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) 

 User innserUser = getItem(position);

 if (convertView == null)

 convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_layout, parent, false);

 

 TextView username = (TextView) convertView.findViewById(R.id.userNameContact);
 TextView userNumber = (TextView) convertView.findViewById(R.id.userNumberContact);
 ImageView userImage = (ImageView) convertView.findViewById(R.id.userImageContact);

 try 
 if(innserUser != null) 
 username.setText(innserUser.name);
 userNumber.setText(innserUser.number);
 userImage.setImageBitmap(innserUser.imageBitmap);
 
 catch (Exception e)
 e.printStackTrace();
 

 return convertView;

 

and here is the user class nothing special here

import android.graphics.Bitmap;

public class User 

 String id, name, number;
 Bitmap imageBitmap;

 User(String id, String name, String number, Bitmap imageBitmap)

 this.id = id;
 this.name = name;
 this.number = number;
 this.imageBitmap = imageBitmap;

 

I tied alot of variations of the getFilter from many threads but none of them work for me ,and the one's with good explanations are for BaseAdapter not for ArrayAdapter

I have tried this question and i have tried this question but does not work for me.

I am new to android development field, and this seems particularly unintuitive.
Any suggestions would be really appreciated, thank you.

EDIT 1: After the answer of jitesh mohite, Thanks for the replay jitesh mohite

class CustomArrayAdapter extends ArrayAdapter<User> implements Filterable 


 ArrayList<User> users;

 CustomArrayAdapter(@NonNull Context context, ArrayList<User> users) 
 super(context, 0, users);
 this.users = users;
 

 @NonNull
 @Override
 public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) 

 User innserUser = getItem(position);

 if (convertView == null)

 convertView = LayoutInflater.from(getContext()).inflate(R.layout.row_layout, parent, false);

 

 TextView username = (TextView) convertView.findViewById(R.id.userNameContact);
 TextView userNumber = (TextView) convertView.findViewById(R.id.userNumberContact);
 ImageView userImage = (ImageView) convertView.findViewById(R.id.userImageContact);

 try 
 if(innserUser != null) 
 username.setText(innserUser.name);
 userNumber.setText(innserUser.number);
 userImage.setImageBitmap(innserUser.imageBitmap);
 
 catch (Exception e)
 e.printStackTrace();
 

 return convertView;

 


 Filter myFilter = new Filter() 
 @Override
 protected FilterResults performFiltering(CharSequence constraint) 
 FilterResults filterResults = new FilterResults();
 ArrayList<User> tempList=new ArrayList<User>();
 // Add the filter code here
 if(constraint != null && users != null) 
 int length= users.size();
 int i=0;
 while(i<length)
 User item= users.get(i);
 //do whatever you wanna do here
 //adding result set output array

 //item.name is user.name cause i want to search on name
 if(item.name.toLowerCase().contains(constraint.toString().toLowerCase()) ) // Add check here, and fill the tempList which shows as a result

 tempList.add(item);
 

 i++;
 
 //following two lines is very important
 //as publish result can only take FilterResults users
 filterResults.values = tempList;
 filterResults.count = tempList.size();
 
 return filterResults;
 

 @SuppressWarnings("unchecked")
 @Override
 protected void publishResults(CharSequence contraint, FilterResults results) 
 users = (ArrayList<User>) results.values;
 if (results.count > 0) 
 notifyDataSetChanged();
 else 
 notifyDataSetInvalidated();
 
 
 ;

 @Override
 public Filter getFilter() 
 return myFilter;
 

the search is not working on the customadapter still i think i am doing something wrong.

here i am typing something in the search bar but no filtering happens

and if you want to see the searchbar code its nothing special just the usual

@Override
public boolean onCreateOptionsMenu(Menu menu) 

 MenuInflater inflater = getMenuInflater();

 inflater.inflate(R.menu.search_box, menu);

 MenuItem item = menu.findItem(R.id.app_bar_search);

 SearchView searchView = (SearchView)item.getActionView();

 searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() 
 @Override
 public boolean onQueryTextSubmit(String query) 
 return false;
 

 @Override
 public boolean onQueryTextChange(String newText) 

 customArrayAdapter.getFilter().filter(newText);

 return false;
 
 );


 return true;

ArrayAdapter's built-in Filter uses the toString() return from the model class (i.e., its type parameter) to perform its filtering comparisons. You don't necessarily need a custom Filter implementation if you're able to override User's toString() method to return what you want to compare, provided its filtering algorithm is suitable to your situation (see below). In this case:

@Override
public String toString() 
 return name;

To be clear on exactly what that algorithm is, ArrayAdapter's default filtering goes as follows:

The filter String is first converted to lowercase. Then, looping over the dataset, each value's toString() return is converted to lowercase, and checked to see if it startsWith() the filter String. If so, it's added to the result set. If not, a second check is performed, whereby the value's lowercase String is split on a space (" "), and each value from that is compared to the filter, again using startsWith(). Basically, it first checks if the whole thing starts with the filter text, and then checks each word, if necessary.

If that's a suitable filter, then this solution is by far the simplest.

Filter myFilter = new Filter() 
 @Override
 protected FilterResults performFiltering(CharSequence constraint) 
 FilterResults filterResults = new FilterResults(); 
 ArrayList<User> tempList=new ArrayList<User>();
 // Add the filter code here
 if(constraint != null && users!=null) 
 int length= users.size();
 int i=0;
 while(i<length)
 User item= users.get(i);
 //do whatever you wanna do here
 //adding result set output array 
 if() // Add check here, and fill the tempList which shows as a result

 tempList.add(item);
 

 i++;
 
 //following two lines is very important
 //as publish result can only take FilterResults users
 filterResults.values = tempList;
 filterResults.count = tempList.size();
 
 return filterResults;
 

 @SuppressWarnings("unchecked")
 @Override
 protected void publishResults(CharSequence contraint, FilterResults results) 
 users = (ArrayList<User>) results.values;
 if (results.count > 0) 
 notifyDataSetChanged();
 else 
 notifyDataSetInvalidated();
 
 
 ;

Lastly, Override this method and return filter instance.

@Override
 public Filter getFilter() 
 return myFilter;
 

For more reference see https://gist.github.com/tobiasschuerg/3554252