In CheckBoxPreference, what is the difference between "android:defaultValue" and "android:checked"? Both seems to be doing the same thing
<CheckBoxPreference
android:key="pref_"
android:title=""
android:summary=""
android:defaultValue="true"
android:checked="true">
</CheckBoxPreference>
Sets the checked state and saves it to the SharedPreferences. And Sets the default value for this Preference, which will be set either if persistence is off or persistence is on and the preference is not found in the persistent storage.
#andychen the default value tag defines what value should be fetched from preference if the user hasn't explicitly stored any value for checkbox in preference. And tag checked defines what state of checkbox should be shown to user on screen initialization
Related
I am following the documentation for creating my preferences xml, which contains a drop down preference populated with a list of languages. I looked up the documentation, and other questions on Stack Overflow, and I should be able to assign an array of strings for the entryValues property of my preference. However, I keep getting an error that says that a String was expected, not an array.
This is my Preferences xml up until now
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<DropDownPreference
android:defaultValue="true"
android:entries="#array/language_settings_options"
android:entryValues="#array/locale_language_preference"
android:key="language_preference"
android:title="#string/language_settings_title" />
</PreferenceScreen>
What am I doing wrong?
I have a XML PreferenceScreen that holds an EditTextPreference like below
<EditTextPreference
app:key="preference_key"
app:title="test preference"
app:useSimpleSummaryProvider="true"/>
If the user has not set anything "Not set" is shown as expected. However I want this to have a default value which is also shown, but the value is dynamic based on some other settings. I already have the code to get said setting, but I just don't know how to set it in the EditTextPrefrence (preference_key) programmatically?
If i try with Preference.setDefaultValue it still showns "Not set"
My requirement
Have a main screen full of preferences (main_screen)
One preference (pref1) in this main_screen when clicked upon opens a
sub screen of settings (sub_screen)
In this sub_screen, there are 2 ListPreferences, when the user
selects a value from these lists, the summary for that ListPreference
is updated to contain the value the user selected
in the main_screen, the summary for pref1 should show the values
selected in the subscreen's listPreferences (i.e. the summary has
List1SelectedValue, List2SelectedValue)
On going into the main_screen for the first time, the summary for
pref1 should be populated
On going to the sub_screen and changing the values, and then
returning to the main_screen the summary should be updated to reflect
the newly selected values in sub_screen.
I have searched around and i can not work out how to set the summary of the pref1 on the main screen to the values selected in the sub_screen.
Sample main_screen xml
<PreferenceScreen>
<PreferenceCategory
style="#style/settings_category_text"
android:title="Section 1 Heading" >
<Preference
android:key="section1_key1"
android:title="Pref 1">
</Preference>
</PreferenceCategory>
<PreferenceCategory
style="#style/settings_category_text"
android:key="extra_settings_category"
android:title="Section 2 Heading" >
<PreferenceScreen
android:key="sub_screen"
android:title="Sub screen of settings"
android:summary="">
<intent
android:targetPackage="com.my.test"
android:targetClass="com.my.test.SubScreenPreferenceActivity" />
</PreferenceScreen>
</PreferenceCategory>
</PreferenceScreen>
Sample sub_screen xml
<PreferenceScreen>
<PreferenceCategory
style="#style/settings_category_text"
android:title="Additional Settings" >
<ListPreference
android:key="list_pref1"
android:title="List Pref 1"
android:defaultValue="1"
android:entries="#array/list_pref1_titles"
android:entryValues="#array/list_pref1_values"
android:summary="%s"
/>
<ListPreference
android:key="list_pref2"
android:title="List Pref 2"
android:defaultValue="1"
android:entries="#array/list_pref2_titles"
android:entryValues="#array/list_pref2_values"
android:summary="%s"
/>
</PreferenceCategory>
</PreferenceScreen>
Sample arrays for list values in sub_screen
<string-array name="list_pref1_titles">
<item>Apples</item>
<item>Pears</item>
<item>Bananas</item>
</string-array>
<string-array name="list_pref1_values">
<item>1</item>
<item>2</item>
<item>3</item>
</string-array>
<string-array name="list_pref2_titles">
<item>Cream</item>
<item>Ice Cream</item>
<item>Custard</item>
</string-array>
<string-array name="list_pref2_values">
<item>1</item>
<item>2</item>
<item>3</item>
</string-array>
My classes
com.my.test.MainPreferenceActivity : code for this main screen of
preferences
com.my.test.SubScreenPreferenceActivity : code for this sub screen
of preferences
What the screens look like
When the settings are displayed the user will see
Section 1 Heading
-----------------
Pref 1
Section 2 Heading
-----------------
Sub screen of settings
Clicking on "Sub screen of settings" will take you to a second settings screen that looks like the following
Additional Settings
-------------------
List Pref 1
Apples
List Pref 2
Cream
Clicking on "List Pref 1" will show a popup for the user to select Apples/Pears/Bananas
Clicking on "List Pref 2" will show a popup for the user to select Cream/Ice cream/Custard
In SubScreenPreferenceActivity i have registered an OnSharedPreferenceChangeListener so that when the user selects a value from one of the options popped up the summary for the the ListPreferences is updated with the value the user has selected.
What I am completely stuck on
I would like the main_screen to also contain a summary of the values that have been set in the sub_screen, for example, in the main screen i would like it to render like the following
Section 1 Heading
----------------
Pref 1
Section 2 Heading
------------------
Sub screen of settings
Apples, Cream
I would like it that when i go into the main_screen initially, the "Sub screen of settings" preference's summary is already set to the currently stored values for the preferences in the sub-screen (using the display values not the actual values).
Also when the user goes to the sub screen and changes the values, on returning to the main_screen the "Sub screen of settings" preference's summary is updated to show the new values of the settings.
How do i set the summary in the main_screen (MainPreferenceActivity) to the values selected in the sub_screen?
How do i update the main_screen when the preferences in the sub_screen (SubScreenPreferenceActivity) change?
Why I have the sub_screen xml in its own file and activity
By the way, I have the sub-screen in a separate XML file and with its own Activity class as I need to call it from the Android settings screens.
In the Android settings, when you click on the Account for my application it shows the "Account & Settings | Sync Settings" screen. In this screen i have it displaying the "Section 2 Heading" PreferenceCategory section (just like in my applications settings screen), clicking on "Account & Settings | Sync Settings" screen takes you to the sub-section preferences screen in my application.
Account & Settings | Sync Settings
AppIcon myAccount
appName
Section 2 Heading
-----------------
Sub screen of settings
Apples, Cream
DATA & SYNCHRONIZATION
----------------------
account_authenticator.xml
<account-authenticator xmlns:android="http://schemas.android.com/apk/res/android"
android:accountType="myAccount"
android:icon="#drawable/launcher"
android:label="#string/app_name"
android:smallIcon="#drawable/launcher"
android:accountPreferences="#xml/account_preferences"/>
account_preferences.xml
<?xml version="1.0" encoding="UTF-8"?>
<PreferenceCategory
style="#style/settings_category_text"
android:key="extra_settings_category"
android:title="Section 2 Heading" />
<PreferenceScreen
android:key="sub_screen"
android:title="Sub screen of settings"
android:summary="">
<intent
android:targetPackage="com.my.test"
android:targetClass="com.my.test.SubScreenPreferenceActivity" />
</PreferenceScreen>
</PreferenceScreen>
I have resolved this myself. It turned out to not be too complex.
In the "onResume" of the activity for the first preference screen, I simply call a utility method to generate the summary string for the preference whose summary is to contain the values of all selected values in the second screen. This utility method queries the stored preferences to get the preference values and then makes up a suitable string. As this utility method checks the values of the stored preference the summary will be accurate when you first go into the activity as well as when you return to the activity from the sub-screen.
For example
in "com.my.test.MainPreferenceActivity" "onResume" method i have the following
// update the preference's summary to a string containing the values selected in the sub-screen
Preference syncPref = findPreference(SUB_SCREN_OF_SETTINGS);
syncPref.setSummary(getSubScreenSummary(....));
public String getSubScreenSummary(){
// get the value of list_pref_1
// get the value of list_pref_2
String s = ...... // build up the string based on values of list_pref_1/list_pref_2
return s;
}
I have some Shared Preferences in my application defined in an XML file. They are EditTextPreferences. I want to display the existing values on the Preference screen so that the user doesn't have to enter the Preference Edit Dialog to see the current value of the Preference. The defaultValue is only visible in the Dialog screen. I want to see the defaultValue in the main preferences screen - maybe in the place of android:summary. How can I do this?
<EditTextPreference
android:key="PREF_LT_500"
android:title="Step 1"
android:summary="I dont want a summary - I want to show current value"
android:inputType="numberDecimal"
android:defaultValue="0.8952"
android:dialogTitle="Enter Blah " />
Thanks in advance
You could try:
yourPrefrence.getText();
Or a more generic solution:
SharedPreferences p = PreferenceManager.getDefaultSharedPreferences(this);
String ans = p.getString(keyStr, defaultValue);
When this is a Context, keyStr is the key & defaultValue is a default value in case the key is not found (usually "")
I have setup ability for a user to specify some settings using the in-built preference system. My preference.xml is simple, with only a ListPreference:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
xmlns:android="http://schemas.android.com/apk/res/android" android:persistent="true">
<PreferenceCategory android:title="Your nuSTOCK Settings" android:persistent="true">
<ListPreference android:key="operation_section" android:entries="#array/array_nustock_section_values" android:summary="What's your operational section in nuSTOCK?" android:entryValues="#array/array_nustock_section_keys" android:title="Operation Section" android:negativeButtonText="Cancel" android:positiveButtonText="OK" android:persistent="true" android:enabled="true"/>
</PreferenceCategory>
</PreferenceScreen>
That references my Arrays, which are:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="array_nustock_section_keys">
<item>store</item>
<item>branch</item>
</string-array>
<string-array name="array_nustock_section_values">
<item>Store</item>
<item>Branch</item>
</string-array>
</resources>
And then I load it (the Preference Module) into my Activity Like this:
nustock_preferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
After which I then prompt the user to set the values (select from only two options), by invoking the preference activity via an Intent:
Intent settingsActivity = new Intent(this,
MyPreferenceActivity.class);
startActivity(settingsActivity);
The Preference Activity is like so:
public class MyPreferenceActivity extends PreferenceActivity {
private static final String PREF_FILENAME = "nustock_preferences";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getPreferenceManager().setSharedPreferencesName(PREF_FILENAME);
addPreferencesFromResource(R.xml.preferences);
}
}
And I then try to read the preference value set by the user like this:
nustock_preferences = PreferenceManager
.getDefaultSharedPreferences(getBaseContext());
String op = nustock_preferences.getString(PREF_OPERATION_SECTION,"none");
Log.d(Tag,String.format("Operation Section : %s", op));
PROBLEM:
No matter what value of the preference I select, only value I get is the default "none" (which I've actually added as different from the actual values in the list, just to highlight the problem -- selected value never gets returned!).
So, What Am I doing wrong? I've tried many variations of this approach, but I can't get the user's selected preference! Even tried restarting the app (hoping that the preferences get set at start-up, nothing!)
But, interestingly, whenever I load the preference screen, the correct value is still selected under the ListPreference dialog!
I believe you specify a particular preference file name with getPreferenceManager().setSharedPreferencesName(PREF_FILENAME);
but later you are trying to get preference value from default preferences .getDefaultSharedPreferences(getBaseContext());
It's like writing data to table PERSON, but later trying to find it in the table DEFAULT
Either remove the setting for preference file name, or get your value from the preference file you specified