it looks like you are modifying the preference temporary. to save the prefrences and be sure it remains the same, use sharedPreferencesTurbo
Persisting programmatically added preferences in android
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14-07-2023 - |
Question
basically what I want is this:
-> I have some settings that (of course) can be modified by the user, on of it is the 'number of cubes'
-> There is an other setting which depends on this setting (movement)
----> if there is one cube the setting is disabled (this works)
----> if there are two cubes there are two options for movement and the setting is enabled (this works too)
----> if there are four cubes there needs to be a choice added for movement and here lays my problem:
I can programmatically change the value of the ListPreference to add this setting but:
-> when the user sets the added value "paired"
and
-> (s)he moves away from the settings, the setting is read correctly
however
-> when the users moves back to the settings the setting is set to the first element of the list(synchronized), not being the choice (s)he made earlier
-> the setting (paired) is remembered by the SharedPreferences instance which I get by calling:
PreferenceManager.getDefaultSharedPreferences(context);
but when moving to the settings again shows the wrong value for the setting (which nobody wants)
How do I persist a programmatically added value?
Of course the reason is that I read the preferences.xml again when the Activity is resumed, but I don't know how to persist the choice made by the user when the Activity is recreated.
This is my code: (the two methods that matter)
public class SettingsActivity extends PreferenceActivity implements
SharedPreferences.OnSharedPreferenceChangeListener {
@Override
public void onCreate(Bundle savedInstanceState) {
Log.d("SA", "onCreate");
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
updateLists();
}
private void updateLists() {
Log.d("SA", "updateLists");
Preference numberOfCubesPref = findPreference("numberOfCubes");
Preference tupleTypePref = findPreference("tuple");
Preference movementTypePref = findPreference("movement_type");
Preference pictureDistributionPref = findPreference("distribution_of_pictures");
ListPreference numberOfCubesListPref = (ListPreference) numberOfCubesPref;
if(numberOfCubesListPref.getEntry() == null){
numberOfCubesListPref.setValueIndex(0);
}
numberOfCubesPref.setSummary(numberOfCubesListPref.getEntry());
ListPreference movementTypeListPref = (ListPreference) movementTypePref;
if(movementTypeListPref.getEntry() == null){
movementTypeListPref.setValueIndex(0);
}
if (numberOfCubesListPref.getEntry().equals("Four")) {
movementTypePref.setEnabled(true);
pictureDistributionPref.setEnabled(true);
CharSequence[] oldEntries = movementTypeListPref.getEntries();
if (oldEntries.length == 2) {
Log.d("SA","length is twoo");
CharSequence[] newEntries = new CharSequence[oldEntries.length + 1];
newEntries[0] = oldEntries[0];
newEntries[1] = "Paired";
newEntries[2] = oldEntries[1];
movementTypeListPref.setEntries(newEntries);
CharSequence[] oldEntryValues = movementTypeListPref
.getEntryValues();
CharSequence[] newEntryValues = new CharSequence[oldEntryValues.length + 1];
newEntryValues[0] = oldEntryValues[0];
newEntryValues[1] = "Paired";
newEntryValues[2] = oldEntryValues[1];
movementTypeListPref.setEntryValues(newEntryValues);
}
} else if (numberOfCubesListPref.getEntry().equals("Two")) {
movementTypePref.setEnabled(true);
pictureDistributionPref.setEnabled(true);
CharSequence[] oldEntries = movementTypeListPref.getEntries();
if (oldEntries.length == 3) {
CharSequence[] newEntries = new CharSequence[oldEntries.length - 1];
newEntries[0] = oldEntries[0];
newEntries[1] = oldEntries[2];
movementTypeListPref.setEntries(newEntries);
CharSequence[] oldEntryValues = movementTypeListPref
.getEntryValues();
CharSequence[] newEntryValues = new CharSequence[oldEntryValues.length - 1];
newEntryValues[0] = oldEntryValues[0];
newEntryValues[1] = oldEntryValues[2];
movementTypeListPref.setEntryValues(newEntryValues);
}
} else {
movementTypePref.setEnabled(false);
pictureDistributionPref.setEnabled(false);
}
ListPreference pictureDistributionListPref = (ListPreference) pictureDistributionPref;
ListPreference tupleTypeListPref = (ListPreference) tupleTypePref;
if(tupleTypeListPref.getEntry() == null){
tupleTypeListPref.setValueIndex(0);
}
CharSequence[] entries = pictureDistributionListPref.getEntries();
CharSequence target, replacement;
if (tupleTypeListPref.getEntry().equals("Two of the same kind")) {
target = "Triplet";
replacement = "Pair";
} else {
target = "Pair";
replacement = "Triplet";
}
for (int i = 0; i < entries.length; i++) {
entries[i] = ((String) entries[i]).replace(target, replacement);
}
pictureDistributionListPref.setEntries(entries);
if(pictureDistributionListPref.getEntry() == null){
pictureDistributionListPref.setValueIndex(0);
}
tupleTypePref.setSummary(tupleTypeListPref.getEntry());
movementTypePref.setSummary(movementTypeListPref.getEntry());
pictureDistributionPref.setSummary(pictureDistributionListPref.getEntry());
}
and my preferences.xml (relevant piece):
<ListPreference
android:dialogTitle="@string/choose_movement_type"
android:enabled="false"
android:entries="@array/movement_type_entries"
android:entryValues="@array/movement_type_values"
android:key="movement_type"
android:title="@string/movement_type" />
and strings.xml: (relevant piece)
<string name="movement_type">Movement type</string>
<string name="choose_movement_type">How do you want to control the cubes?</string>
<string-array name="movement_type_entries">
<item>Synchronized</item>
<item>Independent</item>
</string-array>
<string-array name="movement_type_values">
<item>Synchronized</item>
<item>Independent</item>
</string-array>
The activity is called from within an other activity like this:
settings.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this,
SettingsActivity.class);
MainActivity.this.startActivity(myIntent);
}
});
any help/comments/tips are welcome :)
S.
Solution