Some Android functions

1. 隐藏软键盘

    private void hideKeyboard() {
        final Activity activity = getActivity();
        if (activity != null) {
            View view = activity.getCurrentFocus();
            InputMethodManager imm = (InputMethodManager)
                    activity.getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
    }