Working with TextWatcher and ListView

Question

I have a String[] called lv_arr, and my activity looks like this:

It contains a EditText and below that I am displaying a above lv_arr[] using this code:

listView = (ListView) findViewById(R.id.listview);  
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice,lv_arr);  
listView.setAdapter(adapter);

Currently lv_arr[] contains only one string (i.e "Notes"), and whenever the user adds a string it will be updated. I want to add TextWatcher on my EditText, so I tried the following:

   <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/addLabelText"
        android:hint="Add Label">
        <requestFocus/>

    </EditText>

With:

addLabelText = (EditText) findViewById(R.id.addLabelText);
        addLabelText.addTextChangedListener(listWatcher);
}

private  final TextWatcher listWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int i, int i1, int i2) {
            System.out.println(s);
        }

        @Override
        public void onTextChanged(CharSequence s, int i, int i1, int i2) {

        }

        @Override
        public void afterTextChanged(Editable editable) {

        }
    };

I want a final output which, whenever user types anything in that EditText, the significant values from my list should be displayed below it. When that EditText is goes to a blank state, the below list should display all elements. Otherwise only matching values should be visible.

I tried using a for loop so that I can get matching values, but I am making a mistake somewhere...

Answer 1

So, to achieve my desired output i write code as follows:

1) i changed my EditText to SearchView

<SearchView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/addLabelText"
            />

2)added setOnQueryTextListener on SearchView

addLabelText =(SearchView) findViewById(R.id.addLabelText);
        addLabelText.setOnQueryTextListener(this);

3)implement QueryTextChangeListener 4)Then,

@Override
    public boolean onQueryTextSubmit(String query) {

        return false;
    }

    @Override
    public boolean onQueryTextChange(String newText) {
        adapter.getFilter().filter(newText);
        return false;
    }

Here adapter is the adapter that i used for my List View, i.e

adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice,lv_arr);
        listView.setAdapter(adapter);

Reference Link: http://www.tutorialsbuzz.com/2014/08/android-filters-for-simple-listview.html