Activities interaction

Question

I have 3 Activities, let the Activity A is the main Activity from which B and C Activities are called. B is Activity with settings, and C is Activity with the main actions. I need to realize ToggleButton in B which is responsible for whether the device will vibrate after pressing the buttons in C. Thus, it is necessary to connect B and C. If using Intent, it is necessary to call the StartActivity (Intent)/StartActivityForResult (Intent) method. From this it follows that when pressing ToggleButton in B, the C will be called by B. And it is unnecessary to me. I need that when pressing ToggleButton "something" was remembered "somewhere", and then when the C is called it will be cause to device vibrating. How to solve this problem?

If you need the value to persist then use sharedPreference. Alternatively, you can use static variables. Check this http://www.infoq.com/presentations/Android-Design — Zohra Khan, Feb 04 '14 at 18:51
Check this link http://stackoverflow.com/questions/12189476/public-static-variables-and-android-activity-life-cycle-management — Zohra Khan, Feb 04 '14 at 18:52

score 1 · Answer 1 · answered Feb 04 '14 at 17:48

SharedPreferences is probably the best way to handle this. In Activity B create a SharedPreferences for vibrate, set to the boolean value "true" when the toggle is pressed, and then in Activity C check the SharedPreferences for said value and act accordingly.

score 1 · Accepted Answer · answered Feb 04 '14 at 17:51

You can use SharedPreferences to store some states, eg:

SharedPreferences prefs = getSharedPreferences("myprefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();

editor.putString("key_string", "jack");
editor.putInt("key_int", 30);
editor.putBoolean("vibrator", false);

editor.commit();

Then you can read it when you need it:

SharedPreferences prefs = getSharedPreferences("myprefs", Context.MODE_PRIVATE);

String name = prefs.getString("key_string", "defaultName");
int age = prefs.getInt("key_int", 25);
boolean vib = prefs.getBoolean("vibrator", true);

Basically, SharedPreferences store key-value pairs. Read more about them here and here.

Activities interaction

2 Answers2