I have searched the forums, but can't seem to figure out how to show a title bar in the Android Preferences Fragment. I see questions about how to hide it, but not about how to show it.
I have a preferences activity
public class SettingsActivity extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content,new SettingsFragment()).commit();
}
}
And I have a preferences fragment:
public class SettingsFragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
And I have a preferences xml:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="#string/title">
<CheckBoxPreference
android:key="regular"
However there is no title bar at the top of the preferences screen. Any ideas how to make one show?
You mean show title bar in the fragment?
you can try to inherit AppCompatActivity.
Related
I'm trying to learn how to develop Android apps. I followed a video tutorial on YouTube, and it ended by adding a simple App Settings screen to the application.
However, there's one point that bothers me: when I press the back button on my phone's navigation bar, the changed settings aren't applied.
I have tried searching on Google, but none of the solutions I found have worked. The fact that I don't yet understand 100% of what's happening on the proposed solutions may also contribute to my difficulty on solving this one problem.
The behavior I expect from the app is that when I press the back button on the navigation bar, the changed settings should be applied.
For instance, I have a setting for dark background, which is controlled by a checkbox. The current behavior is: I check the setting for dark background. When I press the back button on the navigation bar, the setting isn't applied (I do have a method that loads the preferences on my MainActivity). What I want to happen is when I press the back button, the dark background is applied in this case.
From what I understand, I believe that overriding onBackPressed should do the trick, but I don't know what should be executed in order to properly apply the settings.
Here are the class and layout of my PreferenceScreen. Regarding the strings on the XML, they aren't actually hard-coded. I just copied the English values here to show the text that should appear on the interface.
public class AppPreferences extends AppCompatActivity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_note_detail);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
SettingsFragment settingsFragment = new SettingsFragment();
fragmentTransaction.add(android.R.id.content, settingsFragment, "SETTINGS_FRAGMENT");
fragmentTransaction.commit();
}
public static class SettingsFragment extends PreferenceFragment
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.app_preferences);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="General">
<EditTextPreference
android:title="Notebook"
android:summary="The title that will be used on the main action bar."
android:key="title"
android:defaultValue="Notebook" />
</PreferenceCategory>
<PreferenceCategory
android:title="Color">
<CheckBoxPreference
android:title="Dark Background"
android:summary="Is the main background color dark?"
android:key="background_color"
android:defaultValue="false" />
</PreferenceCategory>
</PreferenceScreen>
You will need to use
public class AppPreferences extends AppCompatActivity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_note_detail);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
SettingsFragment settingsFragment = new SettingsFragment();
fragmentTransaction.add(android.R.id.content, settingsFragment, "SETTINGS_FRAGMENT");
fragmentTransaction.commit();
}
public static class SettingsFragment extends PreferenceFragment
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.app_preferences);
Preference preference = findPreference("background_color");
preference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
#Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
//do your action here
return false;
}
});
}
}
}
Or from other activity:
PreferenceManager.setDefaultValues(this, R.xml.your_setting_xml, false);
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this);
if (settings.getBoolean("background_color", true)) {
//do your action here
.........
Refer to this question also, (it has similar use case):
Checkbox Preference and Checking if its enabled or disable
Like #Chisko said, there isn't enough code in your question for us to be able to figure out your end goal - although I'm guessing you are wanting some form of persistent storage for your app to be able to save your app preferences. For this, you will want to use something in Android called SharedPreferences. This allows you to save simple data types to be accessed later.
Give that link a read, and then try saving/loading one simple piece of data. You'll want to load it from SharedPreferences on starting the activity (you can specify a default value if it hasn't been saved yet) and then you'll want to save the data in onBackPressed() as you said.
Best of luck and if you run into any issues, just comment here.
#Abdulhamid Dhaiban correctly points it out.
I'll add to your suggestion about overriding the onBackPressed() method.
If your "Up" button (top left <-) provides the correct result, then you can set the Back button to behave like the Up button by just adding the following code:
#Override
public void onBackPressed() {
super.onBackPressed();
NavUtils.navigateUpFromSameTask(this);
}
Hope it helps!
I created a Preferences screen by extending PreferencesActivity as per the example here.
The first screen appears okay but when I click to see the second screen I see them one on top of the other.
So, taking advice from a number of other thread, I changed the background of the second fragment to black.
This worked in as much as I no longer see them both. But instead I see the FIRST one only except for the header.
The first screen looks like this:
and the second one looks like this:
Only the header line changed whereas the rest remained the same.
This is the code in my activity:
public class SettingsActivity extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
getFragmentManager().beginTransaction().replace(android.R.id.content, new PreferencesMain()).commit();
}
/**
* This fragment contains a second-level set of preference that you
* can get to by tapping an item in the first preferences fragment.
*/
public static class PreferencesMain extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences);
}
#Override
public void onStart() {
super.onStart();
View view = getView();
view.setBackgroundColor(ResourcesCompat.getColor(getResources(),android.R.color.black, null));
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
view.setBackgroundColor(ResourcesCompat.getColor(getResources(),android.R.color.black, null));
}
}
/**
* This fragment contains a second-level set of preference that you
* can get to by tapping an item in the first preferences fragment.
*/
public static class PreferencesNotifications extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences_notifications);
}
#Override
public void onStart() {
super.onStart();
View view = getView();
view.setBackgroundColor(ResourcesCompat.getColor(getResources(),android.R.color.black, null));
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
view.setBackgroundColor(ResourcesCompat.getColor(getResources(),android.R.color.black, null));
}
}
#Override
protected boolean isValidFragment (String fragmentName) {
return true;
}
}
preferences.xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="#string/settings_notifications">
<!-- This PreferenceScreen tag sends the user to a new fragment of
preferences. If running in a large screen, they can be embedded
inside of the overall preferences UI. -->
<PreferenceScreen
android:fragment="activities.SettingsActivity$PreferencesNotifications"
android:title="#string/settings_notifications_managePushTitle"
android:summary="#string/settings_notifications_managePushSummary">
android:background="#android:color/black"
<!-- Arbitrary key/value pairs can be included for fragment arguments -->
<extra android:name="someKey" android:value="somePrefValue" />
</PreferenceScreen>
</PreferenceCategory>
preferences_notifications.xml
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<PreferenceCategory
android:title="#string/settings_notifications_managePushHeader">
<CheckBoxPreference
android:key="checkbox_preference"
android:title="#string/settings_notifications_managePushEntry1Title"
android:summary="#string/settings_notifications_managePushEntry1Summary" />
</PreferenceCategory>
Add a header.xml to manage settings, and use onBuildHeaders method.
Resource headers.xml:
<preference-headers xmlns:android="http://schemas.android.com/apk/res/android">
<header android:title="Digle"
android:fragment="activities.SettingsActivity$PreferencesMain"/>
</preference-headers>
Class SettingsActivity:
public class SettingsActivity extends PreferenceActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Remove all code in here
}
#Override
public void onBuildHeaders(List<Header> target) {
super.onBuildHeaders(target);
loadHeadersFromResource(R.xml.headers, target);
}
...
}
EDIT:
An alternative could be use subscreens. You have to place the group of Preference objects inside a PreferenceScreen.
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
android:key="Settings"
android:title="#string/app_name">
<PreferenceCategory
android:title="#string/settings_notifications">
<PreferenceScreen
android:background="#android:color/black"
android:summary="#string/settings_notifications_managePushSummary"
android:title="#string/settings_notifications_managePushTitle">
<PreferenceCategory
android:title="#string/settings_notifications_managePushHeader">
<CheckBoxPreference
android:key="checkbox_preference"
android:summary="#string/settings_notifications_managePushEntry1Summary"
android:title="#string/settings_notifications_managePushEntry1Title"/>
</PreferenceCategory>
</PreferenceScreen>
</PreferenceCategory>
</PreferenceScreen>
I have a PreferenceScreen with a sub PreferenceScreen:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<PreferenceCategory android:title="SOUND">
<PreferenceScreen android:title="Sound Options"
android:fragment="com.test.SoundPreferenceFragment">
</PreferenceScreen>
</PreferenceCategory>
...
The sub preference is a custom implementation of a PreferenceFragment
public class SoundPreferencesFragment extends PreferenceFragment implements
OnSharedPreferenceChangeListener {
...
I am wondering how I am supposed to start the custom fragment. In my main activity I do this:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction().replace(android.R.id.content, settingsPreference).commit();
}
Which works great to start my main settings preference screen.
I then override:
#Override
public boolean onPreferenceStartFragment(PreferenceFragment fragment, Preference preference) {
getFragmentManager().beginTransaction().replace(android.R.id.content, new SoundPreferenceFragment()).commit();
return true;
}
That seems to work but I have a few questions.
Is that the right way?
When I go into the Sounds preference and hit the back button it takes me all the way out of settings. Is that how it should work?
I think I can also tell the sub preference to start a new intent, i.e. create a new SoundPreferencesActivity. Is that a more 'correct' way.
EDIT:
I also tried not to extend 'onPreferenceStartFragment' in my main activity hoping that android would take care of starting the new preference correctly' It does seem to start the new PreferenceFragment but it overlays the UI right on top of the main preferences UI.
You have to create a new activity and attach the SoundPreferencesFragment .
when you select the item in main setting activity , start the new activity
I'm trying to add a PreferenceFragmentin my application. The problem is, it's auto placed on top of my NavigationDrawer.
public class SetPreferenceActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
navigationDrawer(); // Loads the NavigationDrawer
getFragmentManager().beginTransaction().replace(android.R.id.content,
new Settings()).commit();
}
As you can see I load the "SettingsFragment" and replace the content with it? (I'm unsure) but it places it on top of everything else.. Here's my Settings fragment.
public class Settings extends PreferenceFragment {
static final String TAG = "MAIN";
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
Everything work as expected, BUT the PreferenceFragment are loaded in front, covering up the NavigationDrawer slideout, I tried calling bringToFront(); on the listview, with no luck.
A picture for reference :
Is it possible to tell the fragment to load behind the listview? I also tought about loading the fragment in a ViewPager, but I get an error that the Pager Adapter wont accept fragments of type PreferenceFragment.
Don't replace android.R.id.content, use the the id of the FrameLayout you have in the layout that contains your DrawerLayout.
In addition to what adneal said (in case others have the same problem):
The Activity which calls the PreferenceFragment needs to have the setContentView() method if you extend the Activity with your NavigationDrawer:
public class SetPreferenceActivity extends MyNavigationDrawer {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
getFragmentManager().beginTransaction().replace(R.id.drawer_frame_layout,
new Settings()).commit();
}
And the settings.xml should only contain a FrameLayout:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
I had same issue and i resolved it by replacing android.R.id.content to R.id.container.
I am new to Android, so I need a little guidance on how to programmatically add EditTextPreference objects to my PreferenceFragment.
I am pulling in a list of values from a web service. I have saved them successfully to my SharedPreferences, and I use them to generate URLs (path portion).
I would like the users of my app to be able to edit these values, but after lots of searching on Google, it isn't clear to me how to programmatically add EditTextPreference objects to my PreferenceFragment.
Please note, my PreferenceFragment is working fine for the SharedPreferences values I hard code as names into the preference xml file (PreferenceScreen). I also know how to get my SharedPreferences, so don't worry about having to explain that portion to me.
I use addPreferencesFromResource in onCreate of my PreferenceFragment. Should I add them in the onCreateView? I was thinking I could get the PreferenceCategory and add them there? But again, I am not sure how to do that. I would really be grateful for the help!
// Code
PrefsFragment.java:
package com.example.lorddoineedhelp;
import android.os.Bundle;
import android.preference.PreferenceFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class PrefsFragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = super.onCreateView(inflater, container, savedInstanceState);
// I am guessing I need to do something here?
return v;
}
}
XML File for PreferenceFragment:
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Hard coded values -->
<PreferenceCategory
android:title="General">
<CheckBoxPreference
android:key="debug"
android:title="Debug"
android:summary="Enable Debug" />
</PreferenceCategory>
<PreferenceCategory android:title="Address">
<EditTextPreference
android:key="ipAddress"
android:title="IP Address"
android:summary="IP Address used for Image pings"
/>
<EditTextPreference
android:key="port"
android:title="Port"
android:summary="Port used for Image pings" />
</PreferenceCategory>
<!-- Where I want to add the values from my web service -->
<PreferenceCategory
android:title="Paths"
android:key="urlPaths">
</PreferenceCategory>
</PreferenceScreen>
You can add preferences, e.g. EditTextPreference, CheckBox, etc, programmatically in the "onCreate" method of the PreferenceFragment.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load "dummy" (empty) preferences from an XML resource
addPreferencesFromResource(R.xml.preferences_channelconfig);
PreferenceScreen screen = this.getPreferenceScreen(); // "null". See onViewCreated.
// Create the Preferences Manually - so that the key can be set programatically.
PreferenceCategory category = new PreferenceCategory(screen.getContext());
category.setTitle("Channel Configuration");
screen.addPreference(category);
CheckBoxPreference checkBoxPref = new CheckBoxPreference(screen.getContext());
checkBoxPref.setKey(channelConfig.getName() + "_ENABLED");
checkBoxPref.setTitle(channelConfig.getShortname() + "Enabled");
checkBoxPref.setSummary(channelConfig.getDescription());
checkBoxPref.setChecked(channelConfig.isEnabled());
category.addPreference(checkBoxPref);
}
The crucial step is the addPreferencesFromResource(...), with a dummy xml to attach an empty PreferenceScreen to the fragment. Without this, there is no "top-level Preference that is the root of a Preference hierarchy", thus this.getPreferenceScreen() returns Null.
The XML I used was just:
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
android:orderingFromXml="true">
</PreferenceScreen>
Hope that helps someone.
Here is the code to create a PreferenceFragment programmatically:
public class MyPreferenceFragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
PreferenceScreen screen = getPreferenceManager().createPreferenceScreen(getActivity());
setPreferenceScreen(screen);
EditTextPreference preference = new EditTextPreference(screen.getContext());
preference.setKey("EditTextPreference");
preference.setTitle("Edit Text Preference");
preference.setSummary("Click the preference to edit text.");
screen.addPreference(preference);
}
}
I don't know if it works in the onCreateView method but it does in the onViewCreated.
Here is my code (Inside a subclass of PreferenceFragment):
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
this.getPreferenceScreen().addPreference(new EditTextPreference(getActivity()));
}