我使用下拉导航,由于一些主题问题,我使用Spinner来实现。我使用以下方法设置Actionbar:
public void setupActionBar() {
Spinner navSpinner = new Spinner(new ContextThemeWrapper(this, R.style.Theme_Apptheme_Widget_ActionBarSpinner));
navSpinner.setSelection(getSharedPreferences(APP_NAME, MODE_PRIVATE).getInt(SELECTED_POSITION, 0));
Log.d(getClass().getName(), navSpinner.getSelectedItemPosition() + "");
navSpinner.setAdapter(new ActionBarSpinnerAdapter(getActionBar().getThemedContext(), dataSource.getAllShoppingLists()));
navSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
if (position < dataSource.getAllShoppingLists().size()) {
if(fragmentManager.findFragmentByTag("shoppinglist" + position) == null) {
ShoppingListFragment shoppingListFragment = ShoppingListFragment.
newInstance(dataSource.getShoppingListForPosition(position).getId());
fragmentTransaction.replace(R.id.container, shoppingListFragment, "shoppinglist" + position);
}
} else if (position == dataSource.getAllShoppingLists().size()) {
if(fragmentManager.findFragmentByTag("shoppinglistmanager") == null) {
ShoppingListManagerFragment shoppingListFragment = ShoppingListManagerFragment.newInstance();
fragmentTransaction.replace(R.id.container, shoppingListFragment, "shoppinglistmanager");
}
}
fragmentTransaction.commit();
SharedPreferences preferences = getSharedPreferences(APP_NAME, MODE_PRIVATE);
preferences.edit().putInt(SELECTED_POSITION, position).commit();
}
});
getActionBar().setCustomView(navSpinner);
}
我在Fragment
的onCreate()
方法中调用了setRetainInstance(true);
,但是仍然无法持久化Fragment
。我通过编辑文本输入框并输入文本来验证这一点。为什么会发生这种情况?