我有一个带回收者视图的片段(A)。当我按下某个项目时,会显示 DialogFragment (包含该项目的详细信息)。当我按下删除按钮时,该项目被删除并显示片段A(带有更改)。我的问题是如何通知该项目已被删除?我想通过撤消选项显示 Snackbar 。我在谷歌上找不到任何东西..
由于
答案 0 :(得分:3)
在DialogFragment中定义一个接口:
public interface OnDeletedItem {
void onDeletedItem(Item deletedItem);
}
让您的活动实现界面
public class MainActivity
extends AppCompatActivity
implements DialogFragment.OnDeletedItem
@Override
public void onDeletedItem(Item deletedItem) {
// get the Fragment A from fragment manager and notify it via public method to show a Snackbar with the Undo option as desired
FragmentA fragmentA = (FragmentA) getFragmentManager().findFragmentByTag("FragmentA");
fragmentA.showSnackbarForDeletedItem(deletedItem); // implement showSnackbarForDeletedItem or similar method in FragmentA
getSupportFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
然后,当您按下DialogFragment中的“删除”按钮时:
try {
((OnDeletedItem)getActivity()).onDeletedItem(deletedItem);
} catch (ClassCastException cce) {}