I'm using it as follows:
val prefs = PreferenceManager.getDefaultSharedPreferences(context)
val editor = prefs.edit()
editor.putString(Constants.VENDOR_UPDATE_AT, update_date)
editor.commit()
and searching
var update_date = PreferenceManager.getDefaultSharedPreferences(context).getString(Constants.VENDOR_UPDATE_AT, "")
Remembering that I have the context but I'm not in an activity .
SharedPreferences was not meant to save temporary data, but application settings as described in cache , but if you want to save this data for when the application is in the background or something, you should use onSaveInstanceState to store this data temporarily, following the example of android documentation:
TextView mTextView;
// some transient state for the activity instance
String mGameState;
@Override
public void onCreate(Bundle savedInstanceState) {
// call the super class onCreate to complete the creation of activity like
// the view hierarchy
super.onCreate(savedInstanceState);
// recovering the instance state
if (savedInstanceState != null) {
mGameState = savedInstanceState.getString(GAME_STATE_KEY);
}
// set the user interface layout for this activity
// the layout file is defined in the project res/layout/main_activity.xml file
setContentView(R.layout.main_activity);
// initialize member TextView so we can manipulate it later
mTextView = (TextView) findViewById(R.id.text_view);
}
// This callback is called only when there is a saved instance that is previously saved by using
// onSaveInstanceState(). We restore some state in onCreate(), while we can optionally restore
// other state here, possibly usable after onStart() has completed.
// The savedInstanceState Bundle is same as the one used in onCreate().
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
mTextView.setText(savedInstanceState.getString(TEXT_VIEW_KEY));
}
// invoked when the activity may be temporarily destroyed, save the instance state here
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putString(GAME_STATE_KEY, mGameState);
outState.putString(TEXT_VIEW_KEY, mTextView.getText());
// call superclass to save any view hierarchy
super.onSaveInstanceState(outState);
}