问题
I have two fragments, FragmentCity and Fragmentnumber1. When screen orientation changes on fragmentnumber1, it goes back to FragmentCity. Does anyone know how to solve this? I appreciate it if you could show me how to solve this issue
FragmentCity
public class FragmentCity extends Fragment {
final String[] items = new String[]{"FC1", "FC2", "FC3", "FC4","FC5"
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.haz, container, false);
ListView list = (ListView) view.findViewById(R.id.fir);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, items);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Fragment myFragment = null;
switch (arg2) {
case 0:
myFragment = new Fragmentnumber1();
break;
case 1:
myFragment = new Fragmentnumber2();
break;
case 2:
myFragment = new Fragmentnumber3();
break;
case 3:
myFragment = new Fragmentnumber4();
break;
case 4:
myFragment = new Fragmentnumber5();
break;
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
fragmentManager.popBackStackImmediate(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
fragmentManager.beginTransaction().addToBackStack("frag")
.replace(R.id.container2, myFragment)
.commit();
}
});
return view;
}
}
Fragmentnumber1
public class Fragmentnumber1 extends Fragment {
final String[] items = new String[]{"num1", "num2", "num3"
};
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.haz, container, false);
ListView list = (ListView) view.findViewById(R.id.fir);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, items);
list.setAdapter(adapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Fragment myFragment = null;
switch (arg2){
case 0:
myFragment = new num1();
break;
case 1:
myFragment = new num2();
break;
case 2:
myFragment = new num3();
break;
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getChildFragmentManager();
fragmentManager.beginTransaction().addToBackStack(null)
.replace(R.id.container2, myFragment)
.commit();
}
});
return view;
}
}
回答1:
Try adding the following line to your containing activity (probably MainActivity) in the manifest
<activity android:name=".MainActivity"
android:configChanges="keyboardHidden|orientation|screenSize"/>
This will allow the Activity to maintain it's state across orientation changes.
回答2:
You have not posted code of activity class but i am guessing that you have loaded FragmentCity fragment in onCreate of your activity
So when you change orientation it again call onCreate and load FragmentCity fragment so by putting proper condition you can manage it.
来源：https://stackoverflow.com/questions/32503305/fragment-changes-when-screen-is-rotated