sharedpreferences

问题 I want to create a User Session on Android so that i do not have to login every time. What content should be stored in Shared Preferences so that i can authenticate every time my server gets a request from the user i can make sure people are not hacking into my system. The users can login via the following in my app Facebook Google Do i need to convert and store some encrypted data in Shared Preferences ? Or just Storing the users Email or Username should be enough. 回答1: Its easy to store the

问题 How to use SharedPreferences in a class without oncreate ? I get null pointer when accessing it. public class Ftr extends Activity { SharedPreferences preferences; Context ab=this; public void ft() { preferences = PreferenceManager.getDefaultSharedPreferences(ab); String result = preferences.getString("F",""); } } I'm calling Function ft() from another activity Ftr is just a class not an activity. How can I use SharedPreferences in this condition? 回答1: You can take in Common method or Utils

问题 my question is the extension of this question here but in this question I added two function which are : SharedPreferences Remember me function (Checkbox) Currently, I managed to login with/without remember me checkbox and intent the rest of the JSON Object fetch from mysql database. But the problem is inside LoginActivity.java PART A block . When I restart/rebuild the apps, the intent data is null which is not stored and sent into next activity. The data could not be stored and sent into

问题 i am new developer in android applications.i would like to save the data using shared preference concept.i am saving the data in one activity and get the same data in another activity.here i would like to send the String a[]={"one","two","three"} one activity to another activity.i have written code as follows Main1.java public class Main1 extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main);

问题 I have multiple views that come and go as the application runs. I want each view to have its own personal preferences that are stored as the ID tag of the view. Above these is the "General Preferences" that the sub prefs reference to get their default values when a view it is created. Right now I have it set up that the General Preferences are the default SharedPreferences. But I have no Idea how to create the new preferences and set up an activity UI so the user can change them. Is it pretty

问题 I have multiple views that come and go as the application runs. I want each view to have its own personal preferences that are stored as the ID tag of the view. Above these is the "General Preferences" that the sub prefs reference to get their default values when a view it is created. Right now I have it set up that the General Preferences are the default SharedPreferences. But I have no Idea how to create the new preferences and set up an activity UI so the user can change them. Is it pretty

问题 Currently my application is searching for an existing device in "Device" table to enable login access. However, I want to register a new device every time they're required to log in and have them bypass the login page every time the application runs. Currently, the application says there's invalid credentials upon opening since the username and password aren't being saved properly. How do I solve this? protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I tried to save string value after the app closed and re open. I look at all of the SharedPreferences but i didn't understand if i need to open new activity or what. So if you have any idea it will be very helpful. 回答1: what I recommend that you do is to implement shared preferences... going by this way

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I tried to save string value after the app closed and re open. I look at all of the SharedPreferences but i didn't understand if i need to open new activity or what. So if you have any idea it will be very helpful. 回答1: what I recommend that you do is to implement shared preferences... going by this way

问题 Can I save my own object array to the SharedPreferences, like in the post below? Android ArrayList of custom objects - Save to SharedPreferences - Serializable? But there he doesn't save an array, so is there a possibility to save a custom object array to SharedPreferences like in the post of the link? 回答1: You can use gson to serialize class objects and store them into SharedPreferences. You can downlaod this jar from here https://code.google.com/p/google-gson/downloads/list