I am doing an app with preferences but I have used a method that is deprecated and it says :
"This function is not relevant for a modern fragment-based PreferenceActivity". My code is this:
public class Settings extends PreferenceActivity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
How can I update this to not deprecated function. Thank you very much.
The new way is to do the Preferences in an Fragment instead of an Activity. This is espacially true for large screens and tablets. Fragments can be shown separate or next to each other over an Activity according to screen size. Use them like this:
public static class YourPreferenceFragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Load the preferences from an XML resource
addPreferencesFromResource(R.xml.preferences);
}
}
and instead of calling the PreferenceActivity you make a call to the Fragment in your Activity:
YourPreferenceFragment prefFragment = new YourPreferenceFragment();
prefFragment.show(getFragmentManager(), "someFragmentId");
Try to use PreferenceFragment instead.
Check this: http://developer.android.com/guide/topics/ui/settings.html
PreferenceActivity is depricated, you can use PreferenceFragment instead.
here are some tutorials
Link 1
Link 2
Here is the documenattion for PreferenceFragment
Related
I got some nested PreferenceScreen in my PreferenceActivity, and under them a series of CheckBoxPreference.
Everything is working well but, whenever the device is rotated, the PreferenceActivity returns to the main PreferenceScreen, disregarding what nested preference screen the user was in.
This is exactly like in these previous SO questions, where the solution was to add a key to the PreferenceScreen:
When my PreferenceActivity rotates, it does not remember which
PreferenceScreen was open
How to prevent quitting from inner preference screen when there's a
configuration change
Nested Preference Screen closes on Screenorientation change in
Android
I've added keys to all my PreferenceScreen and the solution works, as long as I use the deprecated way:
public class Settings extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
}
}
The problem is I'm using a PreferenceFragment, like in this SO answer (and also here).
The code:
public class Settings extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getFragmentManager().
beginTransaction().
replace(android.R.id.content, new MyPreferenceFragment()).
commit();
}
public static class MyPreferenceFragment extends PreferenceFragment
{
#Override
public void onCreate(final Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.prefs);
}
}
}
So, how to keep inner PreferenceScreen open after screen orientation changes, if possible with the current code?
I see that for Preferences Google now recommends AppCompatActivity and PreferenceFragmentCompat, but I would prefer to not use any libraries, not even Google's, specially for only such a small detail.
I'm quite surprised this little problem managed to generate three SO questions while Android was under API 11, and none - that I can find at least - between API 11 and API 28, when PreferenceFragment was deprecated.
Anyways, I found the solution here in SO as well, in an answer to Android- deprecated method warning regarding PreferenceActivity.
The key is to check if (savedInstanceState == null) before adding the PreferenceFragment, like this:
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
if (savedInstanceState == null)
getFragmentManager().
beginTransaction().
replace(android.R.id.content, new MyPreferenceFragment()).
commit();
}
Now the nested PreferenceScreen remains open when screen orientation changes, as long as it has an android:key value set in, of course.
Hi everyone i want to block the Screenshot in my app. I got the first problem solve from here.
But now the thing is I have more than 10 activity and 10 + fragment.
Is there any way to do this just by writing in the one class and giving it reference to the entire app.
Just like we make one Application class and in the AndroidMainfest.xml give that application class refrence.
You can implement a BaseActivity, and make all your activities extend this BaseActivity. In onCreate() of this activity set the flag. You need to ensure all your activities call super.onCreate() as follows:
BaseActivity.java
public abstract class BaseActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//set your flag here
...
}
}
Activity1.java
public class Activity1 extends BaseActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
}
}
Consider the following activity:
public class SettingsActivity extends PreferenceActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
PreferenceScreen screen =
getPreferenceManager().createPreferenceScreen(this);
}
}
Android Studio shows a warning for the call to getPreferenceManager():
'getPreferenceManager()' is deprecated
This inspection reports where deprecated code is used in the specified inspection scope.
However, it does not describe what corrective action I should take to avoid the warning. I can't find any alternative for obtaining a reference to the PreferenceManager and I see no other way to create a PreferenceScreen.
My goal is to programatically populate the PreferenceActivity with preferences and their default values since these are generated at runtime and cannot be included in xml/preferences.xml.
Although getPreferenceManager() is deprecated in SettingsActivity, it is not deprecated in PreferenceFragment. Therefore, the correct way to create a PreferenceScreen is as follows:
public class SettingsActivity extends PreferenceActivity {
public static class SettingsFragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
PreferenceScreen screen =
getPreferenceManager().createPreferenceScreen(getActivity());
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager()
.beginTransaction()
.replace(android.R.id.content, new SettingsFragment())
.commit();
}
}
Users can add projects in my app and I have a PreferenceFragment for settings of the projects.
This is my Fragment:
public class SettingsFragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.project_settings);
}
}
And my Activity:
public class Settings extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new SettingsFragment())
.commit();
}
}
The availabal settings for each project are identical but the data should be saved per project (e.g. the project name). So how can I save the preferences to my sqlite database?
Putting this here as none of the other questions/answers on this topic were satisfactory, and I just finished precisely this functionality (connect Preferences in a PreferenceFragment to the database).
Basically, you should set android:persistent="false" for each Preference in the XML. You should then load values into the Preferences manually on onCreate(), and use setOnPreferenceChangeListener() to do database value-updating and Preference summary field updating. You may also have to extend some existing Preferences to allow them to be set with values manually, as some of them (e.g. the RingtonePreference) do not have methods to set their values -- they just get them internally from SharedPreferences.
The answer is a Preference.OnPreferenceChangeListener and some magic inside the onPreferenceChange method.
Following the new API's I have created a pretty simple PreferenceFragment:
public class PrefsFragment extends PreferenceFragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
addPreferencesFromResource(R.xml.preferences);
}
}
I use that in my Activity created to enable the user to change app settings:
public class SetPreferenceActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new PrefsFragment()).commit();
}
}
Now I need to change the summary of a ListPreference according to user's choice. There is no findPreference() method defined for Activity class, so how can I access the desired preference?
Sorry if the answer is obvious, I'm not really familiar with the new API and always used a PreferenceActivity before it became deprecated..
Instead of doing new PrefsFragment() right in your statement where you replace the fragment you can do this.
PreferenceFragment pFrag = new PrefsFragment();
PrefsFragment pf = (PrefsFragment)pFrag;
getFragmentManager().beginTransaction()
.replace(android.R.id.content, pFrag).commit();
then in your PreferenceFragment you create a public method that you can change what you want
pf.changeMyPreference();