これはうまくいく可能性があります。 どこかにバグがある可能性があるので注意してください。 私はあなたに似たような状況がありますが、私は3つのスピナーを持っていて、前のものの選択に応じて人口が集まります。
考え方は、スピナーのインデックス/ポジションをIndexVariablesに保存することです。 これらの変数のデフォルト値は-1です。
ストアonSaveInstanceStateの現在値、
はonActivityCreatedの値を復元します。 onItemSelectedチェックで
アイテム= nullを選択した場合IndexVariableが設定された場合、（すなわち、 - = -1！）チェック
ので、スピナーを設定するためにそれを使用する場合、-1に戻すIndexVariableを設定します。ここで
はクラスが
（私はHow to make an Android Spinner with initial text "Select One"からNothingSelectedSpinnerAdapterを使用。 本当に重要ちょうど私がそのコードを得た男/女に大声で叫ぶを与えていない。）
public class SpinnerTestFragment extends Fragment {
private MainActivity activity;
private static final String SELECTED_THEME_IDX_STORAGE_KEY = "mSelectedTheme_IDX_StorageKey";
private static final String SELECTED_AIM_IDX_STORAGE_KEY = "mSelectedAim_IDX_StorageKey";
private static final String SELECTED_GOAL_IDX_STORAGE_KEY = "mSelectedGoal_IDX_StorageKey";
private static String TAG = "SpinnerTestFragment";
private Spinner spnrThemes;
private Spinner spnrAims;
private Spinner spnrGoals;
private String mSelectedTheme;
private String mSelectedAim;
private String mSelectedGoal;
private int mSelectedAimIdx = -1;
private int mSelectedThemeIdx = -1;
private int mSelectedGoalIdx = -1;
//----------------------------------------------------------------------------------------//
public SpinnerTestFragment() {
}//ctor
//----------------------------------------------------------------------------------------//
@Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState) {
Log.d(TAG, "onCreateView");
activity = (MainActivity) getActivity();
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_photo, container, false);
spnrThemes = view.findViewById(R.id.spnrThemes);
spnrAims = view.findViewById(R.id.spnrAims);
spnrGoals = view.findViewById(R.id.spnrGoals);
setSpinner(spnrThemes, "Select Theme", ThemesAimsGoals.getThemes());
spnrThemes.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Object selectedItem = parent.getItemAtPosition(position);
if (selectedItem != null) {
mSelectedTheme = selectedItem.toString();
setSpinner(spnrAims, "Select Aim", ThemesAimsGoals.getAims(mSelectedTheme));
} else if(mSelectedThemeIdx != -1){
selectedItem = parent.getItemAtPosition(mSelectedThemeIdx);
mSelectedTheme = selectedItem.toString();
setSpinner(spnrAims, "Select Aim", ThemesAimsGoals.getAims(mSelectedTheme));
parent.setSelection(mSelectedThemeIdx);
mSelectedThemeIdx = -1;
}//Else
}//onItemSelected
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
spnrAims.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Object selectedItem = parent.getItemAtPosition(position);
if (selectedItem != null) {
mSelectedAim = selectedItem.toString();
setSpinner(spnrGoals, "Select Goal", ThemesAimsGoals.getGoals(mSelectedTheme, mSelectedAim));
} else if(mSelectedAimIdx != -1){
selectedItem = parent.getItemAtPosition(mSelectedAimIdx);
mSelectedAim = selectedItem.toString();
setSpinner(spnrGoals, "Select Goal", ThemesAimsGoals.getGoals(mSelectedTheme, mSelectedAim));
parent.setSelection(mSelectedAimIdx);
mSelectedAimIdx = -1;
}//Else
}//onItemSelected
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
spnrGoals.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Object selectedItem = parent.getItemAtPosition(position);
if (selectedItem != null) {
mSelectedGoal = selectedItem.toString();
}else if(mSelectedGoalIdx != -1){
selectedItem = parent.getItemAtPosition(mSelectedGoalIdx);
mSelectedGoal = selectedItem.toString();
parent.setSelection(mSelectedGoalIdx);
mSelectedGoalIdx = -1;
}//Else
}//onItemSelected
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
return view;
}//onCreateView
//----------------------------------------------------------------------------------------//
/**
* Populate Spinner
* @param spnr Spinner to populate
* @param prompt What to show at the start
* @param array Items in the spinner
*/
private void setSpinner(Spinner spnr, String prompt, String[] array) {
spnr.setPrompt(prompt);
ArrayAdapter<CharSequence> adapter = new ArrayAdapter(activity, android.R.layout.simple_spinner_item, array);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spnr.setAdapter(
new NothingSelectedSpinnerAdapter(
adapter,
R.layout.contact_spinner_row_nothing_selected,
activity,
prompt));
}//setSpinner
//----------------------------------------------------------------------------------------//
/**
* Some lifecycle callbacks so that the image can survive orientation chang
*
* @param outState current state of fragment
*/
@Override
public void onSaveInstanceState(Bundle outState) {
Log.d(TAG, "onSaveInstanceState");
super.onSaveInstanceState(outState);
outState.putInt(SELECTED_THEME_IDX_STORAGE_KEY, spnrThemes.getSelectedItemPosition());
outState.putInt(SELECTED_AIM_IDX_STORAGE_KEY, spnrAims.getSelectedItemPosition());
outState.putInt(SELECTED_GOAL_IDX_STORAGE_KEY, spnrGoals.getSelectedItemPosition());
}//onSaveInstanceState
//----------------------------------------------------------------------------------------//
/**
* Rebuilds the Activity/Fragment in the image of the last one.
*
* @param savedInstanceState Info from last session or rotation
*/
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.d(TAG, "onActivityCreated");
if (savedInstanceState == null)
return;
mSelectedThemeIdx = savedInstanceState.getInt(SELECTED_THEME_IDX_STORAGE_KEY);
mSelectedAimIdx = savedInstanceState.getInt(SELECTED_AIM_IDX_STORAGE_KEY);
mSelectedGoalIdx = savedInstanceState.getInt(SELECTED_GOAL_IDX_STORAGE_KEY);
}//onActivityCreated
}//Cls
だあなたはしてみてくださいました。 ... BaseAdapterアダプタ=（BaseAdapter）yourSpinner.getAdapter（）; adapter.notifyDataSetChanged（）; – DroiDev
サンプルコードスニペットを入力してください。 –
@NikhilLotkeいくつかのコードでポストを更新しました。 – JPM