sharedpreferences

问题 So I inherited this Android project from someone else. The code currently seems to be storing huge amounts of data (that should really belong to an SQLite database) into the shared preferences. I'm very uncomfortable with that part of the code and want to start using the sqlite database. But I am still unable to justify to myself the time it would take especially if it comes with no immediate benefits. Of course I'm eventually going to move it to sqlite but since I'm kinda on a tight deadline

问题 I want to run a specific code only once in my android application.Shared preferences solution is not the solution as when you go to application manager and perform Clear Data then shared preferences gets deleted so application treats it a new fresh installation. I even tried Application class that too failed,it works same as shared preferences. Any help except Shared preferences and Application Class will be appreciated. Thanks. 回答1: The answer hinges on what "only once" means. Once per

问题 I have been able to save Integers and Strings as Shared Preferences but have searched and cannot seem to be able to save a Spinners selected value as a shared preference? spinner = (Spinner)findViewById(R.id.spnCalorieRange); adapter = ArrayAdapter.createFromResource(this, R.array.Calorie_Range, android.R.layout.simple_spinner_dropdown_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); spinner.setOnItemSelectedListener(new

问题 I'm developing small application for my class mates, which is adjustable timetable. It uses Fragments to display each day of week as a nice, finger-swipable UI: In SettingsActivity.class there are preferences (defined in xml), which automatically store settings in SharedPreferences. The problem is that class, in which Fragment is defined, is static. I cannot use there non-static method reference, like that one: SharedPreferences settings = getSharedPreferences(APP_PREFERENCES, MODE_PRIVATE);

问题 I have a tabhost with three activities and I want to save the pressed state of the buttons of each activity So now How can I save the pressed state of each button in all three child activities so that when I move from one activity to the other the button pressed state will be reflected on moving back. first activity -> all 4 buttons pressed -> go to 2nd activity -> come back to first activity -> all buttons in first activity should be in pressed state When I go to second child tab and come to

问题 in my app i am storing a value in Shared Preference and it gets stored successfully. Following is a piece of my code SharedPreferences prefs = getSharedPreferences( "idValue", 0 ); Editor editor = prefs.edit(); editor.putString( "idValue", chap.getid() ); editor.commit(); Log.e("Shared Pref",""+chap.getid()); Now i want to use this value in some other activities with a condition whether it is null or has an value. How to get this value in another activity..... 回答1: You can simply use

问题 I was coding a clock for android. For it, i set a function which updates screen 1 time each a second, so my program can consume a lot of resources, and my objective is to add a checkbox preference, consuming the less resources as I can. Then, my question is: I have seen some ways to update preferences with onSharedPreferenceChangeListener for example... Which is the way which consumes less system resources? How should I implement it to my code? 回答1: if you are using a PreferenceActivity you

问题 I have a helper class for dealing with the default shared preferences. I retrieve the preferences once and I wrap all the SP methods I need, providing the same cached instance. It goes like: public final class AccessPreferences { private static SharedPreferences prefs; // cache private static SharedPreferences getPrefs(Context ctx) { // synchronized is really needed or volatile is all I need (visibility) SharedPreferences result = prefs; if (result == null) synchronized (AccessPreferences

问题 I've looked around, and there are some similar questions, but none with a working solution. I've created a simple ListView to take input from an EditText and display it in a list on button click. If a list item is clicked, I have a dialog popup and ask for confirmation to delete. When "yes" is clicked, the item appears to delete. Though if I then try to delete another item, that item will delete, but the previous item will reappear in its place. I have no idea how to solve this problem. From

问题 I have 2 activities. Initially the button in first activity is invisible. What I want is that when I click a button in the second activity then the button in my first activity should become visible. This is my second activity code till now. this.promodeimage.setOnClickListener(new OnClickListener() { public void onClick(View view) { ///What should i do in here } }); 回答1: Do one thing ! its easy .. just make the button in your first activity as public static public class Activity_One extends