访问另一个应用程序的共享首选项

Question

I am trying to access the shared preferences of another application using this code:

final ArrayList<HashMap<String,String>> LIST = new ArrayList<HashMap<String,String>>();
            @SuppressWarnings("deprecation")
            Context myContext = null;
            try {
                myContext = createPackageContext("owning app's pkg name", 
                Context.CONTEXT_IGNORE_SECURITY);
            } catch (NameNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } // where com.example is the owning  app containing the  preferences
              @SuppressWarnings("deprecation")
            SharedPreferences testPrefs = myContext.getSharedPreferences 
            ("file", Context.CONTEXT_IGNORE_SECURITY); 


            Map<String, ?> items = testPrefs .getAll();
            System.out.println(items.size());
            for(String s : items.keySet())
            {
                //do somthing like String value=     items.get(s).toString());
                System.out.println(items.get(s).toString());
                }

However I am getting the size as 0 of the map "items". This is the stack trace:

12-04 12:24:13.659: W/SharedPreferencesImpl(22768): Attempt to read preferences file   /data/data/owning app's pkg name/shared_prefs/filename.xml without permission
12-04 12:24:13.659: I/System.out(22768): 0

It indicates that the owning app doesn't support the sharing. Is there any way I can overcome this?

Answer 1

owning application needs to have mode WORLD_READABLE permission. Additionally you have to add same android:sharedUserId in the both app's manifest file.