Android - onKeyListener 

EditText _search_text = (EditText) findViewById(R.id.editTextSearchText);
_search_textText.setOnKeyListener(new OnKeyListener()
{
    public boolean onKey(View v, int keyCode, KeyEvent event)
    {
        if (event.getAction() == KeyEvent.ACTION_DOWN)
        {
            switch (keyCode)
            {
                case KeyEvent.KEYCODE_ENTER:
                 this.goToSearchResultPage();
                    return true;
                default:
                    break;
            }
        }
        return false;
    }
});

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