Filter Listview in android

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Mobile

Android

ListView

Hello i have made a dynamic listview..Now i have added filter in listview.m using Adapter in it.

Now i have problem:
My listview is getting filtered perfectly but while backpressing button to clear edittext listview is not getting updated..m updating my code.

here is my code:
From here m calling Getfilter method of my adater class:

list = (ListView) findViewById(R.id.list_Upadates);
// Pass the results into ListViewAdapter.java
adapter = new UpdatesAdapterList(Cardiology_updates.this,
        FinalLocalDataList);
// Set the adapter to the ListView
list.setAdapter(adapter);
// adapter.notifyDataSetChanged();

et = (EditText) findViewById(R.id.search);

// Capture Text in EditText
et.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 arg0, int arg1, int arg2,
            int arg3) {
        //String text = et.getText().toString().toLowerCase(Locale.getDefault());
        adapter.getFilter().filter(arg0);
    }
});

 }
 }

Here is my adapter class includes filter:

This is my filter:

@Override
	public Filter getFilter() {

	    if(valueFilter==null) {

	        valueFilter=new ValueFilter();
	    }

	    return valueFilter;
	}
	
	private class ValueFilter extends Filter {
		//Filter filter = new Filter() {
			
	           
	           
	           ArrayList> filteredList;

	           

	           @Override
	           protected FilterResults performFiltering(CharSequence constraint) {
	               // Holds the results of a filtering operation in values
	        	   FilterResults results=new FilterResults();
	        	   
		           if(constraint!=null && constraint.length()>0){
		        	   
	               filteredList= new ArrayList>();

	               //This is the search string user typed in EditText. 
	              // String searchString = constraint.toString().startsWith(prefix).toUpperCase(Locale.getDefault());

	               /*
	                * Code to update the filteredList based on Search String.
	                * 
	                * I'm just writing pseudo code for search, based on
	                * Cardiology_updates.UpdateTitle
	                */ 
	                int mCount=data.size();
	                
	                for (int i = 0; i < mCount; i++) {
	                    HashMap obj= data.get(i);
	                    String updateTitle=obj.get(Cardiology_updates.UpdateTitle);
	                    if(updateTitle.toUpperCase().startsWith(constraint.toString().toUpperCase())){
	                         filteredList.add(obj);
	                         
	                    } 
	                } 
	                results.count = filteredList.size();
                    results.values = filteredList;
		           }else{
	                    // set the Filtered result to return
	                    results.count = filteredList.size();
	                    results.values = filteredList;
	                }
	            
	            return results;
	            
	        }
	           @Override
	           protected void publishResults(CharSequence constraint,
	                FilterResults results) {
	               // Has the filtered values
	               data = (ArrayList>) results.values;  
	               notifyDataSetChanged();          
	           }
	     };
	     
}