I usually use this code for creating sharedPrefs file:
SharedPrefrences SP = getSharedPrefrences("MYPREF",0);
SP.getString("Username","x");
But now if I see this directory:
"/data/data/packageName/"
There is no shared_prefs directory.
Another thing : if I use Editor its work properly.
First you need to store some data in shared preferences using apply()/commit() method so that you retrieve data from there.
SharedPrefrences SP = getSharedPrefrences("MYPREF",0);
SP.edit().putString("Username","SOME NAME").apply();
System.out.println("Username is : "+SP.getString("Username","x"));
First of all you have to SET the data with an Editor
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("Name","Pepito");
editor.apply();
Then you can read it as follows :
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
String name = preferences.getString("Name", "Here's the default value");
If you've set the value after make that getString() your String value will be "Pepito", otherwise you'll get "Here's the default value"
Related
I try Shared preferences for the first time and I am facing a problem. When i set my Shared Preferences:
SharedPreferences sp = getSharedPreferences();
The getSharedPreferences is red and there is also no suggestion from android studio to change it.
Do I have to update my gradle file or is that function replaced by something else?
You have to call .getSharedPreferences() on the current context (for example getActivity().getPreferences(Context.MODE_PRIVATE);).
You can see some examples here: https://developer.android.com/training/data-storage/shared-preferences.
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0);
Editor editor = pref.edit();
editor.putString("key_name", "string value"); // Storing string
editor.commit();
Get String from your SharedPreferences
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0);
String newval = pref.getString("key_name", null);
You should use context like below
private val sharedPreferences: SharedPreferences? =
context.getSharedPreferences("Preference", Context.MODE_PRIVATE)
The below code helped me:
SharedPreferences sh = appCompatActivity.getApplicationContext().getSharedPreferences("MySharedPref", Context.MODE_PRIVATE);
i am using shared preference in android but it return null,
i saw a lot of code example for this and i can't see any error in my code
SharedPreferences sp =this.getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
Log.v("sharedpref",""+username+": "+password);
editor.putString("email", username);
editor.putString("pass",password);
editor.apply();
and here i am retrieving the data from shared preference (in another activity)
SharedPreferences sp =this.getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
Log.v("shersend",""+sp.getString("email", "Empty")+": "+sp.getString("pass", "Empty"));
String email = sp.getString("email", "Empty");
String pass = sp.getString("pass", "Empty");
so is there any problem with my code?
and is there a better to write this?
You are saving the preference in one Activity say A, And accessing in another activity say B, and context of both activities are different and so preferences values cannot be accessed as mode is private.
try
this.getApplicationContext().getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
Please try that way, Change this code block
SharedPreferences sp =this.getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
to this code block
SharedPreferences sp= PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
Use getApplicationContext()
SharedPreferences sp =getApplicationContext().getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
Log.v("sharedpref",""+username+": "+password);
editor.putString("email", username);
editor.putString("pass",password);
editor.commit();
I am saving a value in Preference, but it always give me the default value. When the app is opened, I can get the actual value. But when I am getting the value from the IntentService, it always give me the default value.
Code for saving the value:
prefs = context.getSharedPreferences(NAME, Context.MODE_PRIVATE);
Editor editor = prefs.edit();
editor.putString(key, value);
editor.commit();
Code for reading the value:
prefs = context.getSharedPreferences(NAME, Context.MODE_PRIVATE);
String value = prefs.getString(key, defaultValue);
But if i change file name then its working for some period but afterward again it start giving default value
Try changing your access mode from Context.MODE_PRIVATE since you are reading it from outside.
Try
prefs = context.getSharedPreferences(NAME, Context.MODE_MULTI_PROCESS);
Retrieving stuff from Shared Preferences:
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(Context);
String s = sp.getString("key", null); // get "value" from the Shared Preferences
I am using following code:
SharedPreferences sharedPref = getSharedPreferences(GlobalDefines.SHARED_PREFERENCES, Context.MODE_PRIVATE);
String test = sharedPref.getString(GlobalDefines.GCM_KEY, "");
SharedPreferences.Editor editor = sharedPref.edit();
editor.clear();
editor.putBoolean(GlobalDefines.USER_IS_LOGGED_IN, false);
editor.remove(GlobalDefines.USER_NAME);
editor.remove(GlobalDefines.USER_PASSWORD);
editor.commit();
test = sharedPref.getString(GlobalDefines.GCM_KEY, "");
The string "test" has a value when I get the value from the shared preferences for the first time; when I remove another value from the preferences and want to get the same value (GCM_KEY) again, it is returned empty.
Why is that?
editor.clear() tells the editor that you want to remove ALL values from your SharedPreferences. Remove this line and you will see the expected behavior.
I am trying to use a value stored in a shared preference to help style a listview and when I use this code it comes back the default value;
SharedPreferences pref = context.getSharedPreferences("Level", 0);
mCounter = pref.getInt("Level", 3);
This is the code I used to store the preference:
SharedPreferences pref = getSharedPreferences("com.komodostudios.asllessons", MODE_PRIVATE);
pref.edit().putInt("Level", 1).commit();
getSharedPreferences(String name, int mode)
where name is the name of the preferences file
getInt (String key, int defValue)
where key is the actual preference key
Do you have named your preferences and the key both "Level"? If not that is the problem.
This should work:
SharedPreferences pref = getSharedPreferences("com.komodostudios.asllessons", MODE_PRIVATE);
mCounter = pref.getInt("Level", 3);
Are you sure the preferences have been changed from their default settings? When using the SharedPreferences.Editor you must remember to call commit() to save your changes.
SharedPreferences pref = getSharedPreferences("com.komodostudios.asllessons", MODE_PRIVATE);
mCounter = pref.getInt("Level", 3);
You have to do above code..
Use below code to store & get value from prefrance. this is best way to do this.
For store data:
pref = PreferenceManager
.getDefaultSharedPreferences(getApplicationContext());
editPref = pref.edit();
editPref.putBoolean("logedin", true);
editPref.commit();
For Get Data:
pref = PreferenceManager
.getDefaultSharedPreferences(getApplicationContext());
editPref.getBoolean("logedin", false);
You need to set same shared preference name when you want to get the value.Like here you want to get your value in "Level" preference but put in different shared preference " com.komodostudios.asllessons".
So that you get the default value for "Level"
Code will be like that:
To store:
SharedPreferences pref = getSharedPreferences("com.komodostudios.asllessons", MODE_PRIVATE);
Editor editPreference=pref .edit();
editPreference.putInt("Level",2);
editPreference.commit();
To retrieve:
SharedPreferences pref = getSharedPreferences("com.komodostudios.asllessons", MODE_PRIVATE);
int mCounter = pref.getInt("Level",1);