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我有一個帶有MultiSelectListPreference的Android應用程序,我使用onPreferenceChange()
方法來更新首選項摘要。我設法編寫了基於newValues
參數更新摘要的代碼,但Object的內容與用戶選擇的實際選項不匹配。MultiSelectListPreference onPreferenceChange()方法獲取錯誤參數
這裏是我的代碼:
public boolean onPreferenceChange(Preference preference, Object newValue) {
if (preference instanceof MultiSelectListPreference) {
List<String> newValues = new ArrayList<>((HashSet<String>) newValue);
MultiSelectListPreference pref = (MultiSelectListPreference) preference;
ArrayList<String> newSummary = new ArrayList<>();
ArrayList<CharSequence> values = new ArrayList<>(Arrays.asList(pref.getEntryValues()));
for (int i = 0; i < newValues.size(); i++) {
int currentIndex = findIndexOfString(values, newValues.get(i).replaceAll(" ", ""));
String title = (currentIndex >= 0) ? pref.getEntries()[currentIndex].toString().replaceAll(" ", "") : "";
newSummary.add(title);
}
pref.setSummary(TextUtils.join(", ", newSummary));
}
return true;
}
private static int findIndexOfString(List<CharSequence> list, String s) {
for (int i = 0; i < list.size(); i++) {
if (s.equals(list.get(i).toString().replaceAll(" ", ""))) {
return i;
}
}
return -1;
}