Save the state of a counter

Question

In my application I have a counter that increases with the use of certain buttons. My problem is that I would like to save the state of the counter. When I close the application and reopen this resets, and I want to show the result that there was before closing the app

code:

TextView Display;
int counter = 0 ;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


Display = (TextView)findViewById(R.id.counter);


Button example:

counter = counter-3;
Display.setText(""+counter);

Use Shared Preferences.http://developer.android.com/guide/topics/data/data-storage.html#pref — Raghunandan, Apr 02 '14 at 17:02
check this http://stackoverflow.com/questions/151777/saving-activity-state-in-android?rq=1 — Farnabaz, Apr 02 '14 at 17:02
@Farnabaz op wants to save the value after app close and re-open the linked post does not help — Raghunandan, Apr 02 '14 at 17:04
shared preference could be good please give me an example of code thanks — francescofalletta, Apr 02 '14 at 17:05
@user3490452 its there in the docs and look at the api's and use them appropriately — Raghunandan, Apr 02 '14 at 17:08

score 1 · Answer 1 · edited May 23 '17 at 11:49

1

You have many ways to do that, depends on the application and its uses

You can

Use shared preferences (preferred as per your question)

refer to How to use SharedPreferences in Android to store, fetch and edit values
Not a good practice but if you want you can save in a file.
Use Sqlite (tons of tutorial, e.g. Android SQLite Database Tutorial)

edited May 23 '17 at 11:49

Community

1
1

answered Apr 02 '14 at 17:32

empr777

91
6

I could send the "number" from onPause and take that "number" to onResume. I know sharedPreferences but I do not know how to make it work for this – francescofalletta Apr 02 '14 at 17:43
Here add something like this //your key can be string --"counter" and value as counter SharedPreferences sp = context.getSharedPreferences(PREF_NAME, Activity.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); editor.putString(key,value); editor.commit(); – empr777 Apr 02 '14 at 17:52

Save the state of a counter

1 Answers1