You have two options.
With xml:
<EditText
android:id="@+id/editText1"
android:inputType="text"
android:imeOptions="actionDone"/>
and with code.
edittext.setOnEditorActionListener(new OnEditorActionListener() {
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
if (event != null&& (event.getKeyCode() == KeyEvent.KEYCODE_ENTER)) {
InputMethodManager in = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
in.hideSoftInputFromWindow(edittext.getApplicationWindowToken(),InputMethodManager.HIDE_NOT_ALWAYS);
}
return false;
}
});