Question

I am developing a android application where I need time stamp should be saved in time picker even if we click back button in android.Since I am new to android I need help.Thanks in advance for help.

Answer 1

System.currentTimeMillis();

Will get you the current timestamp.If you want to save it somehow you may use SharedPrefences or sqlite db or something like this.

I think I would prefer SharedPreferences since you want the timestamp to be there after clicking the back button. Clicking that button might exit you application so some persistent storage would be fine. The timestampt is no POJO so SharePreferences are my first choice.

Something like that should help:

// That will save the timestamp
SharedPreferences pref = context.getSharedPreferences("PREF_TAG_TIMESTAMP", Context.MODE_PRIVATE);
pref.edit().putLong("PREF_TAG_TIMESTMAP", System.currentTimeMillis()).commit();
pref.edit().clear().commit();

// That will get you the timestamp
SharedPreferences pref = context.getSharedPreferences("PREF_TAG_TIMESTAMP", Context.MODE_PRIVATE);
pref.getLong("PREF_TAG_TIMESTMAP", -1.0);