I have those preference:
<xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<CheckBoxPreference
android:key="pk1"
android:title="#string/pt1"
android:summary="#string/pt1s"
android:defaultValue="false" />
<CheckBoxPreference
android:key="pk2"
android:title="#string/pt2"
android:defaultValue="false" />
<ListPreference
android:key="pk3"
android:title="#string/pt3"
android:dialogTitle="#string/pt3"
android:entries="#array/fontsi"
android:entryValues="#array/fontsiv"
android:defaultValue="0" />
<Preference
android:key="pkb"
android:title="#string/ptb" />
</PreferenceScreen>
And the settings activity:
public class SettingsActivity extends PreferenceActivity {
SharedPreferences.OnSharedPreferenceChangeListener lst;
SharedPreferences prf;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
prf = getPreferenceScreen().getSharedPreferences();
lst = new SharedPreferences.OnSharedPreferenceChangeListener() {
public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
Log.i("SettingsActivity","!any preference changen!");
if (key.equals("pk1")) { Log.i("SettingsActivity","!pref PK1 called!"); } }
else if (key.equals("pkb")) { Log.i("SettingsActivity","!pref PKB called!"); }
prf.registerOnSharedPreferenceChangeListener(lst);
}
#Override
protected void onResume() {
super.onResume();
prf.registerOnSharedPreferenceChangeListener(lst); }
#Override
protected void onPause() {
super.onPause();
prf.unregisterOnSharedPreferenceChangeListener(lst); }
...
}
The listener works with all the preferences but e custom preference (the last one, pkb as key)!
That i want to use as a back button.
Anybody knows why ?
Obviously your preference doesn't change any preferences.
Since it doesn't do anything, OnSharedPreferenceChangeListener ignores it.
A possible solution would be to set a clickListener to it like this:
findPreference("pkb").setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
Log.i("SettingsActivity", "!pref PKB called!");
return false;
}
});
Related
onSharedPreferenceChanged isn't called when preferences is changed, I use following code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings2);
getFragmentManager().beginTransaction().replace(android.R.id.content, new Frag()).commit();
}
public static class Frag extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.pref);
getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
#Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
System.out.println(key);
}
}
pref.xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<SwitchPreference android:title="show floating touch" android:defaultValue="false"></SwitchPreference>
</PreferenceScreen>
it doesn't invoke onSharedPreferenceChanged when i change SwitchPreference, why?
the code SwitchPreference doesn't set android:key:
<SwitchPreference android:title="show floating touch" android:defaultValue="false"></SwitchPreference>
when change it to:
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<SwitchPreference android:key="show_float_toucher" android:title="show floating toucher" android:defaultValue="false"/>
</PreferenceScreen>
it work
I found useful the following link for the same problem :
How to listen for preference changes within a PreferenceFragment?
code sample:
public class PrefActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new PrefFragment()).commit();
}
public static class PrefFragment extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
#Override
public void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
#Override
public void onPause() {
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
super.onPause();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// set xml
addPreferencesFromResource(R.xml.pref);
// set texts correctly
onSharedPreferenceChanged(null, "");
}
#Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
if (key.equals("show_float_toucher"))
{
//TODO
}
}
}
}
Tip: check you minSdkVersion !
best regards!
i have setup an onpreference click listener for a preference but it fails to fire even though the preference is found by the find preference command.
Activity
public class PreferenceActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Display the fragment as the main content
setContentView(R.layout.activity_preference);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.replace(R.id.settings, new SettingsFragment())
.commit();
}
}
public static class SettingsFragment extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
Context context;
private final String DOB = "date";
private SharedPreferences prefs;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
context = getActivity().getApplicationContext();
Preference dob = findPreference(DOB);
Log.i("test", dob.getKey() + "");
dob.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
Log.i("test", "2");
return false;
}
});
}
#Override
public void onPause() {
super.onPause();
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}
#Override
public void onResume() {
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
}
}
The preference xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory android:title="My Account">
<EditTextPreference
android:key="profile_name"
android:summary="Taylor Swift"
android:title="Username" />
<Preference
android:key="date"
android:summary="N.A."
android:title="#string/date" />
</PreferenceCategory>
</PreferenceScreen>
The log output for "test" correctly displays the key of the preference but the log within the onclick never fires.
I've created simple project with your code and everything seems to be working fine.
Log.i("test", "2");
is being called when I click "Date" field.
I am a newbie at android development and I am trying to implement a Settings Activity so that it can take user preferences. This is my Settings Activity which already includes code to handle Edit Preference changes.The module is implemented for Android 3.0 and above hence Settings Fragment is used.
public class SettingsActivity extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content, new SettingsFragment()).commit();
}
public static class SettingsFragment extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener{
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.pref_general);
}
#Override
public void onResume(){
super.onResume();
getPreferenceScreen().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
#Override
public void onPause(){
super.onPause();
getPreferenceScreen().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
}
#Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key){
if(key.equals("location")){
Preference loc_preference=findPreference("location");
loc_preference.setSummary(sharedPreferences.getString(key,""));
}
}
}
}
This is the pref_gen.xml file
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<EditTextPreference
android:key="#string/pref_loc_key"
android:dialogMessage="#string/location_dialog_message"
android:dialogTitle="#string/location_dialog"
android:title="#string/pref_loc_label"
android:defaultValue="#string/pref_default_loc"
android:selectAllOnFocus="true"
android:singleLine="true" />
<ListPreference
android:key="#string/pref_unit_key"
android:dialogTitle="#string/unit_dialog_message"
android:title="#string/pref_unit_label"
android:defaultValue="#string/pref_default_unit"
android:entries="#array/pref_unit_options"
android:entryValues="#array/pref_unit_values" />
This is the arrays.xml file
<string-array name="pref_unit_options">
<item>Metric</item>
<item>Imperial</item>
</string-array>
<string-array name="pref_unit_values">
<item>1</item>
<item>0</item>
</string-array>
Can anyone help me to add the List Preference module in the Settings Fragment method along with a listener? I have gone through other posts but somehow I cant modify it accordingly.
You can use getPreference to reference ListPreference in java and then register listener on it.
ListPreference unit_preference = mContext.getPreference(<Key>);
unit_preference .setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
public boolean onPreferenceChanged(Preference preference, Object newValue) {
//Do something with newValue here
}
});
Note: mContext is a class variable of type Context. You must set it before calling beginTransaction:
mContext = this;
I have prepared a simple test case at GitHub for my question and have a feeling, that only few lines of code are missing to make it working.
In an Android app I have 1 activity (MainActivity.java) and 2 fragments (MainFragment.java and PrefFragment.java) - and when I change values in the preferences fragment, they are not saved.
Also the default values are not loaded and the summaries not updated:
Here is my PrefFragment where I register a shared prefs listener - in order to update the summaries - but for some reason it is never called:
public class PrefFragment extends PreferenceFragment
implements OnSharedPreferenceChangeListener {
public static final String BOOL_1 = "bool_1";
public static final String STR_1 = "str_1";
public static final String STR_2 = "str_2";
private CheckBoxPreference mBool1;
private EditTextPreference mStr1;
private EditTextPreference mStr2;
private SharedPreferences mPrefs;
private Editor mEditor;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(false);
addPreferencesFromResource(R.xml.preferences);
mBool1 = (CheckBoxPreference) findPreference(BOOL_1);
mStr1 = (EditTextPreference) findPreference(STR_1);
mStr2 = (EditTextPreference) findPreference(STR_2);
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
mPrefs = PreferenceManager.getDefaultSharedPreferences(activity);
mEditor = mPrefs.edit();
mPrefs.registerOnSharedPreferenceChangeListener(this);
}
#Override
public void onDetach() {
super.onDetach();
mPrefs.unregisterOnSharedPreferenceChangeListener(this);
}
#Override
public void onSharedPreferenceChanged(SharedPreferences prefs,
String key) {
Log.d("onSharedPreferenceChanged", key); // XXX is never called
if (BOOL_1.equals(key)) {
boolean bool1 = prefs.getBoolean(key, false);
mBool1.setSummary(bool1 ? "Enabled" : "Disabled");
} else if (STR_1.equals(key)) {
String str1 = prefs.getString(key, "");
mStr1.setSummary(str1);
} else if (STR_2.equals(key)) {
String str2 = prefs.getString(key, "");
mStr2.setSummary(str2);
}
}
}
And here is preference.xml:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory
android:title="Category 1"
android:key="category_1">
<CheckBoxPreference
android:key="bool_1"
android:title="Boolean 1"
android:summary="XXX how to set this? XXX"
android:defaultValue="false" />
<EditTextPreference
android:dependency="bool_1"
android:key="str_1"
android:title="String 1"
android:summary="XXX how to set this? XXX"
android:defaultValue="change me" />
<EditTextPreference
android:dependency="bool_1"
android:key="str_2"
android:title="String 2"
android:summary="XXX how to set this? XXX"
android:defaultValue="change me too" />
</PreferenceCategory>
</PreferenceScreen>
So my question is how to handle (load, save) values in PreferenceFragment? Do I really have to extend EditTextPreference and implement onDialogClosed method in my custom class? This seems like an overkill approach to me.
Ok, the following seems to work in PrefFragment.java:
#Override
public void onResume() {
super.onResume();
SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
// CHANGE 1: load saved values to set the summaries
onSharedPreferenceChanged(prefs, BOOL_1);
onSharedPreferenceChanged(prefs, STR_1);
onSharedPreferenceChanged(prefs, STR_2);
// CHANGE 2: register shared prefs listener in onResume
prefs.registerOnSharedPreferenceChangeListener(this);
}
#Override
public void onPause() {
super.onPause();
SharedPreferences prefs = getPreferenceManager().getSharedPreferences();
prefs.unregisterOnSharedPreferenceChangeListener(this);
}
EDIT: I tried this new code but it still seems they are reset. Can anyone tell me, and propose a solution to my settings being reset?
public class UserSettingActivity extends PreferenceActivity implements OnPreferenceChangeListener{
static SwitchPreference mucus_stamps;
static SwitchPreference fertile_infertil;
static SwitchPreference cervical_mucus;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
/**
* Populate the activity with the top-level headers.
*/
#Override
public void onBuildHeaders(List<Header> target) {
Log.i("PROJECTCARUSO","onBuildHeaders");
loadHeadersFromResource(R.xml.preference_headers, target);
}
/**
* This fragment shows the preferences for the first header.
*/
public static class Prefs1Fragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.notification_settings);
}
}
/**
* This fragment shows the preferences for the second header.
*/
public static class Prefs2Fragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.charting_settings);
//findPreference("cervical_mucus").setOnPreferenceChangeListener(
mucus_stamps = (SwitchPreference) findPreference("mucus_stamps");
fertile_infertil = (SwitchPreference) findPreference("fertile_infertil");
cervical_mucus = (SwitchPreference) findPreference("cervical_mucus");
cervical_mucus.setOnPreferenceChangeListener(
new OnPreferenceChangeListener() {
#Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
// string test w/o "==" usage.
if (newValue.equals(false)) {
Log.i("PROJECTCARUSO","false");
mucus_stamps.setChecked(false);
fertile_infertil.setChecked(false);
} else {
Log.i("PROJECTCARUSO","true");
mucus_stamps.setChecked(true);
fertile_infertil.setChecked(true);
}
// true instead of false so the new value gets kept
return true;
};
});
if(!cervical_mucus.isChecked()){
mucus_stamps.setSelectable(false);
mucus_stamps.setEnabled(false);
fertile_infertil.setSelectable(false);
fertile_infertil.setEnabled(false);
} else {
mucus_stamps.setSelectable(true);
mucus_stamps.setEnabled(true);
fertile_infertil.setSelectable(true);
fertile_infertil.setEnabled(true);
}
}
}
protected void onPause()
{
super.onPause();
}
protected void onResume()
{
super.onResume();
}
#Override
public boolean onPreferenceChange(Preference arg0, Object arg1) {
// TODO Auto-generated method stub
return true;
}
}
XML:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory
android:title="#string/pref_chart_profile"
android:textSize="20px">
<SwitchPreference
android:title="#+string/pref_symptothermal"
android:summary="#+string/pref_symptothermal_summary"
android:key="symptothermal"
android:defaultValue="true"
android:layout="#layout/pref_layout"/>
<SwitchPreference
android:id="#+id/cervical_mucus"
android:title="#+string/pref_cervical_mucus"
android:summary="#+string/pref_cervical_mucus_summary"
android:key="cervical_mucus"
android:defaultValue="true"
android:layout="#layout/pref_layout" />
<SwitchPreference
android:id="#+id/mucus_stamps"
android:title="#+string/pref_mucus_stamps"
android:summary="#+string/pref_mucus_stamps_summary"
android:key="mucus_stamps"
android:defaultValue="true"
android:layout="#layout/pref_layout" />
<SwitchPreference
android:id="#+id/fertile_infertil"
android:title="#+string/pref_fertile_infertile"
android:summary="#+string/pref_fertile_infertile_summary"
android:key="fertile_infertil"
android:defaultValue="true"
android:layout="#layout/pref_layout" />
</PreferenceCategory>
</PreferenceScreen>
Depending on what you want.
The value is saved(tested), but "selectable" is not a preference value. Therefore you have to set it when the preferencescreen is launched.
Do this:
Before your oncreate:
SwitchPreference mucus_stamps;
Then above your findPreference("mucus_stamps")
mucu_stamps = (SwitchPreference) findPreference("mucus_stamps");
Now, outside the onclicklistener, you can set it.
if(!mucus_stamps.isChecked()){
mucus_stamps.setSelectable(false);
mucus_stamps.setEnabled(false);
}
(I added "setEnablet" to show you that you can disable it aswell, not just make it "non-selectable". Selectable only says that you can't click anything outside the "off/on" area to change it to on/off.)
Personally I prefer to do it like this:
mucus_stamps = (SwitchPreference) findPreference("mucus_stamps");
mucus_stamps.setOnPreferenceChangeListener(
new OnPreferenceChangeListener() {
#Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
//SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
// string test w/o "==" usage.
if (newValue.equals(false)) {
mucus_stamps.setChecked(false);
mucus_stamps.setSelectable(false);
} else {
mucus_stamps.setChecked(true);
}
// true instead of false so the new value gets kept
return true;
};
});
if(!mucus_stamps.isChecked()){
mucus_stamps.setSelectable(false);
mucus_stamps.setEnabled(false);
}
And, you don't need to implement OnPreferenceChangeListener when you do it the way you or I do. Not that it really matters.
:)