hidden_fragment.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
shown_fragment.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
HiddenFragment.java:
public class HiddenFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (container == null) {
return null;
}
View view = inflater.inflate(R.layout.hidden_fragment, container, false);
final FloatingActionButton fab = ((MainActivity) getActivity()).getFloatingActionButton();
if (fab != null) {
((MainActivity) getActivity()).hideFloatingActionButton();
}
return view;
}
}
ShownFragment.java:
public class ShownFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (container == null) {
return null;
}
View view = inflater.inflate(R.layout.hidden_fragment, container, false);
final FloatingActionButton fab = ((MainActivity) getActivity()).getFloatingActionButton();
if (fab != null) {
((MainActivity) getActivity()).showFloatingActionButton();
}
return view;
}
}
在我的MainActivity.java中,我有这个:
public FloatingActionButton getFloatingActionButton() {
return fab;
}
public void showFloatingActionButton() {
fab.show();
}
public void hideFloatingActionButton() {
fab.hide();
}
目前的方式不起作用。当我启动应用程序时,第一个启动的片段是HiddenFragment。但是当我转到ShownFragment时,FAB不会出现。我尝试了另一种方法,我在每个片段中添加了一个按钮,并将showFloatingActionButton()和hideFloatingActionButton()添加到按钮中,这样就可以正常工作了。有人知道我做错了什么吗?
show()
和hide()
应该能够正常工作,这对我很有效。您正在使用哪个版本的支持库?此外,您是否在该片段中使用 ViewPager? - Daniel Nugent