How to filter the listview in android?

Question

There are many solutions provided to this question, but I am not getting exactly where I am going wrong. I have a custom adapter, and I want to filter it.

My adapter class is as follows.

public sendivitesadapter(Context context,ArrayList<Item> items,String[]udis) {
        super(context,0,items);

        this.context= context;
         mCheckedState = new boolean[items.size()];
        this.qrusers =(qrusers) context;
        this.items = items;
        this.udis=uid;
        //mContext = context;
        vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return items.size();
    }

    @Override
    public Item getItem(int position) {
        // TODO Auto-generated method stub
        return super.getItem(position);
    }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {

            View v = convertView;

            final Item i = items.get(position);

            if (i != null) {
                if(i.isSection()){
                    SectionItem si = (SectionItem)i;
                    v = vi.inflate(R.layout.checkboxlist, null);

                    v.setOnClickListener(null);
                    v.setOnLongClickListener(null);
                    v.setLongClickable(false);

                    final TextView sectionView = (TextView) v.findViewById(R.id.list_item_section_text);
                    sectionView.setText(si.getTitle());

                }else{
                    sendItem ei = (sendItem)i;
                    v = vi.inflate(R.layout.checkboxlist, null);
                    final TextView title = (TextView)v.findViewById(R.id.contactname);
                    final TextView subtitle = (TextView)v.findViewById(R.id.companyname);
                     checkBox=(CheckBox)v.findViewById(R.id.checboxlist);
                    //checkBox.setTag(position);
                    //items.addAll(uid);


               checkBox.setTag(udis[position]);





               checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

                    if(isChecked){

                        //  isChecked=true;
                        s=(String)buttonView.getTag();
                        Log.e("IDDDDDDDD", s);

                        userid.add(s);
                        Log.e("Array", userid.toString());
                    }
                    else{

                        s=(String)buttonView.getTag();
                        userid.remove(s);

                    }

                    SharedPreferences app_preferences = PreferenceManager
                            .getDefaultSharedPreferences(qrusers.this);
                    SharedPreferences.Editor editor = app_preferences.edit();

                    editor.putString("userid", TextUtils.join(",", userid));
                    editor.commit();
                }
            });

                    if (title != null) 
                        title.setText(ei.contactname);
                    if(subtitle != null)
                        subtitle.setText(ei.companyname);

                }
            }
            return v;
        }

         public Filter getFilter() {
                if (mFilter1 == null) {
                    mFilter1 = new ItemsFilter1();
                }
                return mFilter1;

            }

        private class ItemsFilter1 extends Filter{

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();

                if (constraint == null || constraint.length() == 0){
                    results.values = items;
                    results.count = items.size();

                }
                else{

                     ArrayList<Item> itemsList1 = new ArrayList<Item>();

                     for (Item i : items){

                         if (i.toString().toUpperCase().startsWith(constraint.toString().toUpperCase()))
                                itemsList1.add(i);
                     }
                     results.values = itemsList1;
                        results.count = itemsList1.size();
                }
                return results;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                 if (results.count == 0){

                     notifyDataSetInvalidated();
                 }
                 else{

                     ArrayList<Item> lst1 = (ArrayList<Item>)results.values;
                     ArrayList<Item> itemsList1 = new ArrayList<Item>(lst1);
                     //this.items=mItems;
                    items =itemsList1;              
                    notifyDataSetChanged();
                 }

            }



        }

and in my activity I have used this code.

 usersearch1.addTextChangedListener(new TextWatcher() {

                    @Override
                    public void onTextChanged(CharSequence s, int start, int before, int count) {
                        if (usersearch1.getText().toString().equals("")){
                            sendadapter  = new sendivitesadapter(qrusers.this,items1,uid);

                            listView.setAdapter(sendadapter);



                        }

                        s=usersearch1.getText().toString();
                        Log.e("ALPHABETS", usersearch1.getText().toString());
                        sendadapter.getFilter().filter(s);
                    }

There are no errors, but when I type in EditText ,nothing happens. Please let me know I am getting wrong.

Answer 1

first of all - why are you setting your adapter inside TextChangeListener? Whatever you type inside your EditText it will refresh your listView without making any changes to it.

second of all - if you have implemented well your getFilter() method inside your sendadapter, then the only thing you should do inside onTextChange is to reset data of your adapter (get default view of your adapter data) and then execute sendadapter.getFilter().filter(s)

so, in your onCreate of your activity you should do at least this:

@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.YourSearchActivity);

    //since you haven't show rest of the code, im guessing names of the variables and U elements
    //connect UI elements with varables in code
    EditText usersearch1 = (EditText) findViewById(R.id.usersearch1);       
    ListView listView = (ListView) findViewById(R.id.listview)
    sendadapter = new sendinvitesadapter(yourActivity.this, YourListOfItems, YourStringofUdis);

    /*
    *  REST OF CODE
    */

    //set text listener to your EditText 
    usersearch1.addTextChangedListener(new TextWatcher() 
    {
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) 
        {
            // if (count < before) {sendadapter.resetData();}
            //resetData() method might be necessary, if your filtering method won't react on backspace 
            Log.e("ALPHABETS", usersearch1.getText().toString());
            sendadapter.getFilter().filter(s);
        }
    });


    /*
    *  REST OF CODE
    */

    //set adapter
    listView.setAdapter(sendadapter);
    //enable filtering of your list
    listView.setTextFilterEnabled(true);                            
}

Answer 2

add onTextChanged method

  if (!usersearch1.getText().toString().equals(""))
  {
    sendadapter.getFilter().filter(s);

   //Must
    sendadapter.notifyDataSetChanged();
  }