Shared Preferences not save data properly

Question

Hello I have 3 activities in my app and I transport data between them with Intent. The problem that I ran into is that Shared Preferences I have on my main activity get change when I returned to the main activity from the 3 activity. I suspect that the problem is that my intent get reboot but I'm not sure. I'm trying to get the data remain the same as it was when i moved to the 3 activity. my app start in activity 1 then its going to the main activity and at last if you click a button its goes to the third activity get some data and returned to the main activity the problem I have is that the data I got form the first activity get restart when I returned from the third activity. when i move data between activities I use intent.

my code to transport the intent activity 1:

        Bundle CIW = new Bundle();
    CIW.putInt("one", int1);
    CIW.putInt("two", int2);
    CIW.putDouble("double", double);
    Intent a = new Intent(Must.this, Main.class);
    a.putExtras(CIW);
    startActivity(a);

my code to get the bundles in my main activity (its in mine on create method):

            Intent must = getIntent();
        Intent name = getIntent();
        Bundle CIW = must.getExtras();
        Bundle card = name.getExtras();
        int1 = CIW.getInt("one");
        int2 = CIW.getInt("two");
        double= CIW.getDouble("double");
        int3 = card.getInt("three");

my Shared Preferences code (on pause):

            SharedPreferences settings = PreferenceManager
            .getDefaultSharedPreferences(getApplicationContext());
    SharedPreferences.Editor editor = settings.edit();
    editor.putInt("one", Int1); //the rest of the variable 
editor.commit();

my Shared Preferences code (on resume):

    SharedPreferences settings = PreferenceManager
            .getDefaultSharedPreferences(getApplicationContext());
    int1 = settings.getInt("one", int1); //the rest of the variable 

my code to transport the intent activity 3:

Bundle number = new Bundle();
    number.putInt("three", int3);
    Intent a = new Intent(Card.this, Main.class);
    a.putExtras(number);

Answer 1

Your shared preferences file (name) is always the same right?

If you are using shared preferences from different activity/services/intents/... you should use it with mode MODE_MULTI_PROCESS (constant value int = 4). If not, file gets locked and only one process can write it at once!

So when you call shared preferences in multi processes app do it like this:

SharedPreferences preferences = this.getSharedPreferences("myapp",4);

MODE_MULTI_PROCESS is ON on all version till android 2.3, but latter must be called strictly! Offical docs say:

Operating mode. Use 0 or MODE_PRIVATE for the default operation, MODE_WORLD_READABLE and MODE_WORLD_WRITEABLE to control permissions. The bit MODE_MULTI_PROCESS can also be used if multiple processes are mutating the same SharedPreferences file. MODE_MULTI_PROCESS is always on in apps targetting Gingerbread (Android 2.3) and below, and off by default in later versions.