public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    private ArrayAdapter adapter;

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

        ListView list = (ListView) findViewById(R.id.theList);
        EditText theFilter = (EditText) findViewById(R.id.searchFilter);

        Log.d(TAG, "onCreate: Started.");

        ArrayList<String> names = new ArrayList<>();
        names.add("United States");
        names.add("Israel");
        names.add("England");
        names.add("France");
        names.add("Germany");
        names.add("Georgia");

        adapter = new ArrayAdapter(this, R.layout.list_item_layout, names);
        list.setAdapter(adapter);

        theFilter.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

                (MainActivity.this).adapter.getFilter().filter(s);

            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

    }
}

public class MainActivity extends AppCompatActivity {

    public static TextView data;
    public TextView dataNew;

    Button b;

    // Additional code for the search - Part 1

    private static final String TAG = "MainActivity";

    private ArrayAdapter adapter;

    // Additional code for the search - Part 1

    ListView listView;
    String[] fruitNames = {"USD", "ILS", "GBP", "CAD", "EUR"};
    String[] fruitDesc = {"United States", "Israel", "United Kingdom", "Canada", "Europe"};
    String[] currencyRates = {"1", "1", "1", "1", "1"};
    int[] fruitImages = {R.drawable.us5, R.drawable.il5, R.drawable.uk5, R.drawable.ca5, R.drawable.eu5};

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

        /// Additional code for the search - Part 2

        Button b = (Button) findViewById(R.id.button);
        b.setOnClickListener( new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                ListView list = (ListView) findViewById(R.id.listview);
                EditText theFilter = (EditText) findViewById(R.id.edittext);

                Log.d(TAG, "onCreate: Started.");

               adapter = new ArrayAdapter(MainActivity.this, R.layout.row_data, fruitNames);
                list.setAdapter(adapter);

                 theFilter.addTextChangedListener(new TextWatcher() {
                  @Override
                    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

                    }

                   @Override
                    public void onTextChanged(CharSequence s, int start, int before, int count) {

                        (MainActivity.this).adapter.getFilter().filter(s);

                   }

                   @Override
                  public void afterTextChanged(Editable s) {

                    }
                });

            }
        });

        /// Additional code for the search - Part 2