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在Android 4中,我有一個首選值,我想以標準格式E2C56DB5-DFFB-48D2-B060-D0F5A71096E0出現。但是用戶可以輸入沒有破折號的值。我想允許用戶輸入任何空格或破折號的組合,並簡單地讓我的代碼正常化它。是否可以在更改時規範化Android偏好值?
我使用下面的代碼,我看到日誌行,但它什麼都沒做。我猜測這是因爲Android有另一個編輯器對象打開覆蓋我的更改。有沒有其他方法可以實現這一點?
public class UuidFragment extends PreferenceFragment {
...
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
this.getPreferenceScreen().findPreference("pref_uuid").setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
@Override
public boolean onPreferenceChange(Preference preference,
Object newValue) {
if (newValue.toString().length() != 0) {
String normalizedUuid=normalizeUuid(newValue.toString());
// TODO: this code runs but does nothing, I think because after committing the change, there is a higher level editor that commits the old value
// thereby undoing this change
if (!normalizedUuid.equals(newValue.toString())) {
Log.d(TAG, "Adjusting uuid from "+newValue.toString()+" to "+normalizedUuid);
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(UuidFragment.this.getActivity());
SharedPreferences.Editor editor = settings.edit();
editor.putString(preference.getKey(), normalizedUuid);
editor.commit();
}
return true;
}
}
});
}
}