ListView Not Updating After Filtering, when the backspace key is entered

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Here is the code, I used a custom adapter, and applied the Filter method, now the ListView does not update when the backspace key is entered, on when one switches back from an item activity. please help me.. and how to display no result to filtered list..

public class ItemListAdapter extends ArrayAdapter<ItemVO>
{

    private ArrayList<ItemVO> itemList;
    private ArrayList<ItemVO> fiems;
    private static final int LONG_DELAY = 3500; // 3.5 seconds
    private static final int SHORT_DELAY = 2000; // 2 seconds
    private Context context;
    private Filter filter;

    public ItemListAdapter(Context context, int textViewResourceId,ArrayList<ItemVO> stateList) 
    {
        super(context, textViewResourceId, stateList);
        this.context = context;
        this.itemList = new ArrayList<ItemVO>();
        this.itemList.addAll(stateList);
        this.fiems=new ArrayList<ItemVO>();
        this.fiems.addAll(stateList);

    }

    private class ViewHolder
    {
        TextView code;
        CheckBox name;
    }

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

        ViewHolder holder = null;

        Log.v("ConvertView", String.valueOf(position));

        if (convertView == null)
        {

            LayoutInflater vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            convertView = vi.inflate(R.layout.listview_items, null);

            holder = new ViewHolder();
            holder.code = (TextView) convertView.findViewById(R.id.textView1);
            holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);

            convertView.setTag(holder);

            holder.name.setOnClickListener( new View.OnClickListener() 
            {
                public void onClick(View v)  
                {
                    CheckBox cb = (CheckBox) v;
                    ItemVO item = (ItemVO) cb.getTag();

                    item.setSelected(cb.isChecked());
                }
            });

        }
        else
        {
            holder = (ViewHolder) convertView.getTag();
        }

        ItemVO state = itemList.get(position);

        holder.code.setText(state.getItemdescription());
        holder.name.setChecked(state.isSelected());

        holder.name.setTag(state);

        return convertView;
    }
    @Override
    public Filter getFilter()
    {
        if (filter == null)
            filter = new PkmnNameFilter();

        return filter;
    }

    private class PkmnNameFilter extends Filter
    {
            @SuppressWarnings("unused")
            @SuppressLint("DefaultLocale")
            @Override
            protected FilterResults performFiltering(CharSequence constraint)
            {   
                FilterResults results = new FilterResults();  // Holds the results of a filtering operation in values
                String prefix = constraint.toString().toLowerCase();

                if (prefix == null || prefix.length() == 0)
                {
                    ArrayList<ItemVO> list = new ArrayList<ItemVO>(fiems);
                    results.values = list;
                    results.count = list.size();
                }
                else
                {
                    final ArrayList<ItemVO> list = new ArrayList<ItemVO>(fiems);
                    final ArrayList<ItemVO> nlist = new ArrayList<ItemVO>();
                    int count = list.size();

                    for (int i=0; i<count; i++)
                    {
                        final ItemVO pkmn = list.get(i);
                        final String value = pkmn.getItemdescription().toLowerCase();

                        if (value.startsWith(prefix))
                        {
                            nlist.add(pkmn);
                        }
                       /*else
                        {
                           final Toast toast= Toast.makeText(context, "No Items Found", Toast.LENGTH_SHORT);
                            toast.show();
                             Handler handler = new Handler();
                             handler.postDelayed(new Runnable() {
                                @Override
                                public void run() {
                                    toast.cancel(); 
                                }
                         }, 1000);
                        }*/
                    }
                    // set the Filtered result to return
                    results.values = nlist;
                    results.count = nlist.size();

                }
                return results;
            }



            @SuppressWarnings("unchecked")
            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {

                itemList = (ArrayList<ItemVO>)results.values; // has the filtered values

                clear();
                int count = itemList.size();
                for (int i=0; i<count; i++)
                {
                    ItemVO pkmn = (ItemVO)itemList.get(i);
                    add(pkmn);

                    notifyDataSetChanged(); // notifies the data with new filtered values
                }
            }

        }


    public void notifyDataSetChanged() {
        super.notifyDataSetChanged();
        boolean notifyChanged = true;
    }
    }

public class CateringList extends Activity 
{
	     ItemVO details;
	     Bfs categoryDetails;
	     ArrayList<ItemVO> itemList;
	     ArrayList<ItemVO> i;
	     ArrayList<String> itemsList;
	     String cat;
	     ArrayAdapter<String> arrayAdapter;
	     ItemListAdapter adapter1;
	     ListView lv;
	     private SharedPreferences sp;
	      ItemListAdapter dataAdapter;
	     EditText searchBox;
	     

		 @Override
		 protected void onCreate(Bundle savedInstanceState)
		 {
			super.onCreate(savedInstanceState);
			setContentView(R.layout.list_item_name);
			//dataAdapter.clear();
			itemList = new ArrayList<ItemVO>();
			//itemList.clear();
			 Log.d("D.TAG", " value.: " + itemList.toString());
			details = (ItemVO) ApplicationCache.getInstance().getValue("categoryNameDetails");
			categoryDetails = (Bfs) ApplicationCache.getInstance().getValue("categoryTypeDetails");
			itemList = categoryDetails.getCategoryNameDetails(); 
			lv = (ListView) findViewById(R.id.list1);
			arrayAdapter = new ArrayAdapter<String>(this,R.layout.listview_items,R.id.textView1);
				for (ItemVO mnvo : categoryDetails.getCategoryNameDetails())
				{
					Log.d("TestTag", "Name of custome care"+mnvo.getCategoryName());
					arrayAdapter.add(mnvo.getCategoryName());
				}
				Log.d("D.TAG", " value: " + itemList.toString());
				
				//binding adapter
				//lv.setAdapter(new MyAdapter(CateringList.this,R.id.textView1,itemList));
				
	   
				 dataAdapter = new ItemListAdapter(this,R.layout.listview_items, itemList);
				 Log.d("D.TAG", " value1: " + itemList.toString());
				 lv.setAdapter(dataAdapter);
				 //lv.setTextFilterEnabled(true);				 
				 searchBox=(EditText) findViewById(R.id.filter_text);
				 //searchBox.addTextChangedListener(filterTextWatcher);
				
		        searchBox.addTextChangedListener(new TextWatcher() {
		        	 
		             @Override
		             public void afterTextChanged(Editable arg0) {
		                 // TODO Auto-generated method stub
		            	 
		             }
		  
		             @Override
		             public void beforeTextChanged(CharSequence arg0, int arg1,
		                     int arg2, int arg3) {
		                 // TODO Auto-generated method stub
		             }
		  
		             @Override
		             public void onTextChanged(CharSequence s, int arg1, int arg2,
		                     int arg3) {
		            	 //String text = searchBox.getText().toString().toLowerCase(Locale.getDefault());
		                 dataAdapter.getFilter().filter(s);
		                 
		                 Log.d("D.TAG", " value2: " + itemList.toString());
		                // dataAdapter.getFilter().filter(s); 
		                 //dataAdapter.notifyDataSetChanged();
		                
		                //  
		             } 
			     });
		        Log.d("D.TAG", " value1: " + itemList.toString());
		        ApplicationCache.getInstance().clear();
		        
		        
				 dataAdapter = new ItemListAdapter(this,R.layout.listview_items, itemList);
				 lv.setAdapter(dataAdapter);
				 Log.d("D.TAG", " value1: " + itemList.toString());
				 
				 
				sp = getSharedPreferences("aksp", Context.MODE_PRIVATE);
				//store your data in a key/value form
				String items = sp.getString("Items", null);
				

				String[] itemsArray = null;
				itemsList = new ArrayList<String>();

					if(items == null || items.equalsIgnoreCase(""))
					{
				
					}
					else
					{
						itemsArray = items.split("\\|");
						for(String c : itemsArray)
						{
							itemsList.add(c);
						}
				
					}
					Intent intentObject = getIntent();
					cat = intentObject.getStringExtra("categorypos");
					Button myButton = (Button) findViewById(R.id.button1);
					myButton.setOnClickListener(new OnClickListener() 
					{
							@Override
							public void onClick(View v) 
							{

									String items = "";
					
									int count = 0;
									for(ItemVO c : itemList)
									{
										if(c.isSelected())
										{
											count++;
											items =items+"\n"+ c.getItemdescription();
											sp.edit().putString("items", items).commit();
							
										}
						
									}
									if(count==0)
									{
											Toast.makeText(CateringList.this, "Please select at least one item", Toast.LENGTH_LONG).show();
											return;
									}
									String catitems=cat +"\n "+"Items:" + items;
									Intent iIntent = new Intent(CateringList.this,MyCart.class);
									iIntent.putExtra("catitems", catitems);
									startActivity(iIntent);
					
									ApplicationCache.getInstance().clear();
									itemsList.clear();
					
									String[] countriesArray = items.split("\\|");
					
									for(String c : countriesArray)
									{
										itemsList.add(c);
									}
					
							}
					});
					/*swipe_layout.setOnTouchListener(new OnTouchListener() {
	                        @Override
	                        public boolean onTouch(View v, MotionEvent ev) {
	                            if (ev.getAction() == MotionEvent.ACTION_DOWN) {
	                                lastY = ev.getRawY();
	                            } else if (ev.getAction() == MotionEvent.ACTION_MOVE) {
	                                nowY = ev.getRawY();
	                            } else if (ev.getAction() == MotionEvent.ACTION_UP) {
	                                if ((nowY - lastY) > 0) {
	                               
	                                    //PULL_DOWN_EVENT, custom function here where you can show you search box view;
	                                }
	                                nowY = 0;
	                                lastY = 0;
	                            }
	                            return false;
	                        }

							
	                      });*/
					
	     }

Posted 27-Jun-14 0:53am

Deepak Drs

Updated 1-Jul-14 21:35pm

v3

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mathiazhagan01 · Accepted Answer · 2014-06-27T18:14:00

Solution 1

Me too had problem with

dataAdapter.notifyDataSetChanged()

I just cleared adapter and again set the adapter whenever I needed to update the list. Its works fine for me.

Posted 27-Jun-14 18:14pm

mathiazhagan01

Comments

Deepak Drs 28-Jun-14 2:46am

I don't think .notifyDataSetChanged() is a valid method call here. It doesn't work in this instance it seems. how to clear that adapter please suggest me..

Deepak Drs 28-Jun-14 2:51am

i used that clear() method outside and inside onTextChanged.. But same problem occurs..
i used like this. .. dataAdapter.clear(); lv.setAdapter(dataAdapter);

Deepak Drs 30-Jun-14 8:37am

@mathiazhagan01362,
Please suggest me.. how to use that clear() and set the adapter in my program..

mathiazhagan01 · Accepted Answer · 2014-06-30T20:28:00

I am using a ArrayList to add the values to be displayed in listview.

List values = new ArrayList();
ListView listView1 = (ListView) findViewById(R.id.listView1);
String listValue = null;
ArrayAdapter adapter;

Adding values using add(), I will have a string in listValue

values.add(listValue);

Setting the adapter

adapter = new ArrayAdapter(getBaseContext(),android.R.layout.simple_list_item_1, android.R.id.text1, values);
			
listView1.setAdapter(adapter);

When I need to change the data in the listView1, I just clear the values using clear()

values.clear();

Then, again set the adapter

adapter = new ArrayAdapter(getBaseContext(),android.R.layout.simple_list_item_1, android.R.id.text1, values);
   			
listView1.setAdapter(adapter);

Hope this help you. But I think this is not a way to do. We should use the notifyDataSetChanged().