当安卓钛中的TextField获得焦点时，我们如何正确显示键盘？

textField.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            // 显示键盘
            InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.showSoftInput(textField, InputMethodManager.SHOW_IMPLICIT);
        } else {
            // 隐藏键盘
            InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(textField.getWindowToken(), 0);
        }
    }
});