Develop Reference

Android preferences how to work with switch statement

I have some preferences in my preference screen:
<PreferenceCategory
android:key="category"
android:summary="Category"
android:title="Category">
<Preference
android:key="pref1"
android:summary="desc"
android:title="Pref 1" />
<Preference
android:key="pref2"
android:summary="desc"
android:title="Pref 2" />
</PreferenceCategory>
Finding them in PreferenceActivity:
Preference pref1, pref2;
#Override
protected void onCreate(final Bundle savedInstanceState) {
pref1 = findPreference("pref1");
pref2 = findPreference("pref2");
}
And set some OnPreferenceClickListener to them. How do I correctly define which preference was clicked? I'd like to do it in case-switch style, but I cannot figure out which types should I use:
Preference.OnPreferenceClickListener listener = new Preference.OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
switch (???){ //I guess, here goes the "preference"?
case ???: //getting error with pref1 or pref2
}
return false;
}
}
If I put preference from onPreferenceClick in switch(), I will get errors with case.

You can get the corresponding preference like
#Override
public boolean onPreferenceClick (Preference preference)
{
String key = preference.getKey();
// do what ever you want with this key
}
ref: Preference Activity on Preference Click Listener
hope this helps :)

You can use the field key of Preference
public boolean onPreferenceClick(Preference preference) {
if (preference.getKey().equals("pref1")) {
... do something ...
} else if (preference.getKey().equals("pref2")) {
... do something ...
}
return true;
}

setOnPreferenceClickListener function doesn't work for Preference on Android

I'm using the code below to print text to logcat, but the setOnPreferenceClickListener function doesn't catch the event.
I'm using Android API Level 8 to test the code.
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<CheckBoxPreference
android:defaultValue="true"
android:key="settings_use_cache"
android:summary="Use cache"
android:title="Use Cache" />
<Preference
android:defaultValue="true"
android:key="settings_delete_cache"
android:summary="Delete all cache data"
android:title="Clear Cache" />
</PreferenceScreen>
Here is the code
public static class CachePreferenceFragment extends
PreferenceActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
Log.w("DBG", "Oncreate started");
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.pref_cache);
Preference settings_delete_cache=findPreference("settings_delete_cache");
settings_delete_cache.setOnPreferenceClickListener(new OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
Log.w("Prefence", "Deleting Cache");
return false;
}
});
}
}
What can I do to ensure the listener catches the event?

EDIT:
After talking with this dev outside of the thread, it was identified that the problem was that he was putting his listener inside of the fragment. So this code actually works, but it will only run if you are using a two-panel layout. In fact this is stated right above the method:
/**
* This fragment shows notification preferences only. It is used when the
* activity is showing a two-pane settings UI.
*/
public static class CachePreferenceFragment extends
PreferenceActivity {
The solution is to also set the onPreferenceClick listener in setupSimplePreferencesScreen()!

Cannot get a hold on my Preferences with Unified Preferences

I use this library to create my PreferenceActivity. It works quite fine so far but I can not set any listeners on my Preference.
That how my Activity looks like:
public class PrefActivity extends UnifiedSherlockPreferenceActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
setHeaderRes(R.xml.preference_headers);
// Set desired preference file and mode (optional)
setSharedPreferencesMode(Context.MODE_PRIVATE);
super.onCreate(savedInstanceState);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Preference p = (Preference)findPreference("deleteSavedSearches");
p.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference arg0) {
//code for what you want it to do
return true;
}
});
}
}
This is my PreferenceScreen:
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<Preference
android:key="deleteSavedSearches"
android:summary="Gespeicherte Suchen löschen"
android:title="Gespeicherte Suchen löschen" />
</PreferenceScreen>
And those are my headers:
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:unified="http://schemas.android.com/apk/res-auto" >
<!--
/*
** Header definitions are identical to android:* except for preferenceRes which should be a reference to a preference xml file
** Unlike the native headers these are also used for building the single pane version.
*/
-->
<header
unified:fragment="com.example.skelett.PrefActivity$GeneralPreferenceFragment"
unified:preferenceRes="#xml/pref_country"
unified:title="Land" />
<header
unified:fragment="com.example.skelett.PrefActivity$GeneralPreferenceFragment"
unified:preferenceRes="#xml/pref_data"
unified:title="Daten" />
</preference-headers>
In this case, p is null. getPreferenceScreen() also always returns null. I have my keys set up in the preference xml. What am I missing?

Just move the findPreference method in onPostCreate and should work:
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
Preference p = (Preference) findPreference("deleteSavedSearches");
p.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference arg0) {
// code for what you want it to do
return true;
}
});
}

Android Prefererences

I'm coming to think my problem is with my preferences not being done correctly is why i cannot access tem. Here is My preferences:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory
android:title="#string/pref_user_profile"
android:textSize="20px"
android:layout="#layout/pref_layout">
<SwitchPreference
android:title="#+string/pref_frequency"
android:summary="#+string/pref_frequency_summary"
android:key="frequency"
android:defaultValue="true"
android:layout="#layout/pref_layout"/>
<SwitchPreference
android:title="#+string/pref_time"
android:summary="#+string/pref_time_summary"
android:key="time"
android:defaultValue="true"
android:layout="#layout/pref_layout"/>
<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: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: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: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>
Java:
package com.projectcaruso.naturalfamilyplaning;
import com.projectcaruso.naturalfamilyplanning.R;
import android.os.Bundle;
import android.preference.PreferenceActivity;
public class UserSettingActivity extends PreferenceActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.settings);
}
}
Here is my call to the settings menu:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
final int RESULT_SETTINGS = 1;
switch (item.getItemId()) {
case R.id.projectcaruso:
Util.goToGitHub(this);
return true;
case R.id.about:
new AlertDialog.Builder(this)
.setTitle(R.string.about)
.setMessage(Html.fromHtml(getString(R.string.about_msg)))
.show();
break;
case R.id.licenses:
new AlertDialog.Builder(this)
.setTitle(R.string.licenses)
.setMessage(Html.fromHtml(getString(R.string.license_detail)))
.show();
break;
case R.id.contact:
break;
case R.id.settings:
Intent j = new Intent(this, UserSettingActivity.class);
startActivityForResult(j, RESULT_SETTINGS);
break;
}
return super.onOptionsItemSelected(item);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getSupportMenuInflater().inflate(R.menu.settings, menu);
return true;
}
}
So any help would be appreciated! I'm trying to access these preferences but cannot. It seems to be saving them just fine. I am able to test and run the code, change the pref's and it saves their state. However when i try to access them i cannot... Here's the code i used to try and access them:
EDIT:
I've changed it to call as the following and no matter the setting it is still the "Hello toast 2!"
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences preferences = this.getActivity().getSharedPreferences("UserSettingActivity",0);
// Inflate the layout for this fragment
Boolean symptothermal = preferences.getBoolean("symptothermal", true);
if (!symptothermal) {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 1!", Toast.LENGTH_LONG).show();
} else {
Context context = getActivity().getApplicationContext();
Toast.makeText(context, "Hello toast 2!", Toast.LENGTH_LONG).show();
}
if (!symptothermal) {
TextView temp = (TextView) getView().findViewById(R.id.temp);
temp.setVisibility(View.GONE);
}
}

The problem is how you are trying to access them.
You use this line:
SharedPreferences preferences = this.getActivity().getSharedPreferences("pref",0);
When to access the preferences that are stored through a PreferenceActivity you should call the default preferences.
SharedPreferences mPreferences = PreferenceManager.getDefaultSharedPreferences(this);
That is it.
Edit
If you are making a call to getDefaultSharedPreferences() from a Fragment, you simply need to change the value you pass as parameter. this in the above example is a context, to call this from the Fragment, do the following:
SharedPreferences mPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());

Probably you trying to read prefs from a different file.
Add getPreferenceManager().setSharedPreferencesName("pref"); to UserSettingActivity and see if it will help

Using Android preferences and dont show a variable to user

I have a sharedPreferences implementation where I store user preferences. When the user clicks "preferences" in menu, I open the standar editor to allow the user to change preferences. This is the code:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.MENU_PREFERENCES:
Intent intent = new Intent(context, PreferencesActivity.class);
startActivity(intent);
return true;
case xx:
....
}
Toast.makeText(this, "ERROR: Bad menu item", Toast.LENGTH_SHORT).show();
return true;
}
In PreferencesActivity.java I have:
public class PreferencesActivity extends PreferenceActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
My question is if can I have a variable in the preferences for internal use, I mean, that will not be showed to user when startActivity(intent)? how?
I suppose I must change something in preferences.xml but dont know exactly what....
thanks
EDIT: as requested, I paste xml:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory>
<ListPreference android:title="Pomodoro duration" android:key="pomodoro_duration" android:summary="Duration of each pomodoro" android:entryValues="#array/array_duration_values" android:defaultValue="25" android:entries="#array/array_duration"/><ListPreference android:key="short_break_duration" android:title="Short break duration" android:summary="Duration of break after each pomodoro" android:entryValues="#array/array_duration_values" android:entries="#array/array_duration" android:defaultValue="5"/>
<ListPreference android:title="Long break interval" android:summary="Interval of the longer break" android:key="intervalos" android:entryValues="#array/interval_array_values" android:defaultValue="4" android:entries="#array/interval_array"/>
<ListPreference android:defaultValue="20" android:title="Long break duration" android:summary="Duration of break after each pomodoro" android:key="long_break_duration" android:entries="#array/array_duration" android:entryValues="#array/array_duration_values"/><RingtonePreference android:title="Notification sound" android:ringtoneType="notification" android:summary="Tone that will sound after pomodoro ends" android:key="notification_tone" android:showDefault="true" android:showSilent="true"/>
<ListPreference android:summary="Period used to calculate productivity" android:title="Calculus period" android:key="calculus_period" android:entryValues="#array/array_calculo_valores" android:entries="#array/array_calculo"/>
</PreferenceCategory>
</PreferenceScreen>
When I inveke the standar UI to allow user to set this variables, I would like to hide one of them programmaticaly. Is possible?

If it is not in preferences.xml, it won't be displayed, so just don't add it there. You can use the SharedPreferences class to get/set preferences without displaying a UI. Something like:
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
boolean flag = prefs.getBoolean("flag", false);