Eu usei ActionBarSherlock para criar ActionBar tem um botão de pesquisa que mostra umAutoCompleteEditText (SHOW_AS_COLLAPSIBLE_ACTION_VIEW) Quando o botão Pesquisar é clicado,EditText é mostrado, eu queroEditText para obter foco e, assim, mostrar o teclado suave, como é expandido este é o código

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getSupportMenuInflater().inflate(R.menu.activity_main, menu);

    boolean isLight = true;
    // Add Search button
    int menuItemId = menu
            .add("Search")
            .setIcon(
                    isLight ? R.drawable.ic_search_inverse
                            : R.drawable.ic_search)
            .setActionView(R.layout.collapsible_edittext)
            .setShowAsActionFlags(
                    MenuItem.SHOW_AS_ACTION_ALWAYS
                            | MenuItem.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW)
            .getItemId();
    // Add Search Topic (Sub Menu)
    SubMenu subMenu1 = menu.addSubMenu("Topic");
    subMenu1.add(Menu.NONE, 10, 0, "All Topics");
    subMenu1.add(Menu.NONE, 11, 1, "Adult");
    subMenu1.add(Menu.NONE, 12, 2, "Pediatric");
    subMenu1.add(Menu.NONE, 13, 13, "Drug");

    MenuItem subMenu1Item = subMenu1.getItem();
    subMenu1Item.setIcon(R.drawable.abs__ic_menu_moreoverflow_holo_light);
    subMenu1Item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);

    searchBar = (AutoCompleteTextView) menu.findItem(menuItemId)
            .getActionView().findViewById(R.id.etSearch);

    setSearchSettings(searchMenuID);

    // get instance of Search Button
    searchWidgetItem = menu.findItem(menuItemId);

    searchBar
            .setOnEditorActionListener(new EditText.OnEditorActionListener() {


                @Override
                public boolean onEditorAction(TextView v, int actionId,
                        KeyEvent event) {
                    if (actionId == EditorInfo.IME_ACTION_SEARCH) {

                        // Perform a Search
                        performSearch(v.getText().toString(),
                                (searchMenuID < 0) ? 3 : searchMenuID);

                        imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                        imm.hideSoftInputFromWindow(v.getWindowToken(), 0);

                        // Collapse the ActionView (Search Bar)
                        searchWidgetItem.collapseActionView();

                        // Clear the TextEdit
                        v.setText("");

                        return true;
                    }
                    return false;
                }
            });
    return true;
}

Eu tentei definir umOnFocusChangeListener no EditText e mostrar Soft Keboard se tiver foco, mas não deu certo:

searchBar.setOnFocusChangeListener(new OnFocusChangeListener() {

            @Override
            public void onFocusChange(View v, boolean hasFocus) {
                if (hasFocus) {
                    imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                    imm.showSoftInput(v, InputMethodManager.SHOW_FORCED);
                }
            }
        });

Como fazer isso ?