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我有一個導航抽屜，有兩個片段：Fragment0和Fragment1 我想保存方向變化時的狀態。在方向變化時保存片段狀態（savedInstanceState）
這是我的代碼：（只有重要組成部分）
public class MainActivity extends Activity {
public int selectedPosition = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null){
selectItem(0);
Log.e("savedInstanceNull", "gets called "+selectedPosition);
} else {
selectedPosition=savedInstanceState.getInt("fragmentposition",0);
Log.v("Position get", ""+selectedPosition);
selectItem(selectedPosition);
}
}
private void selectItem(int position) {
// update the main content by replacing fragments
Fragment fragment = new PlanetFragment();
Bundle args = new Bundle();
args.putInt(PlanetFragment.ARG_PLANET_NUMBER, position);
fragment.setArguments(args);
switch(position){
case 0:
fragment = new Fragment0();
break;
case 1:
fragment = new Futtermittelliste();
break;
}
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mPlanetTitles[position]);
mDrawerLayout.closeDrawer(mDrawerList);
selectedPosition = position;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("fragmentposition", selectedPosition);
Log.v("Position saved", ""+selectedPosition);
}
}
logcat的：
04-01 18:46:58.455: V/Position saved(2077): 1
04-01 18:46:58.515: V/Position get(2077): 1
04-01 18:46:58.555: E/savedInstanceNull(2077): gets called 0
（1）獲取存儲位置（第一個LogCat輸出） 然後是0在savedInstanceState的被調用，我檢索位置（1）（第二LocCat輸出） 但現在，我不知道爲什麼，在if (savedInstanceState == null)被又一次打來電話，這臺selectItem(0)，而不是selectItem(1)
你有一個想法，爲什麼？ 在此先感謝！