Use SharedPreferences to Persist simple data

• Api level 1
• SharedPreferences give you a simple way to store simple data across configuration changes or app restarts.
• Get a prefereces object that is tied to an activity:

    SharedPreferences formStore;
      ...
    //Retrieve or create the preferences object
   formStore = getPreferences(Activity.MODE_PRIVATE);

• Get a preference object you may use across activities:

    public static final String PREF_NAME = "myPreferences";
    ....
    mPreferences = getSharedPreferences(PREF_NAME, Activity.MODE_PRIVATE);

• Retrieve data from prefs and apply it to a ui component:

    @Override
    public void onResume() {
        super.onResume();
        //Restore the form data
        email.setText(formStore.getString("email", ""));
        message.setText(formStore.getString("message", ""));
        age.setChecked(formStore.getBoolean("age", false));
}

• Modify the data in SharedPrefs:

    SharedPreferences.Editor editor = formStore.edit();
            editor.putString("email", email.getText().toString());
            editor.putString("message", message.getText().toString());
            editor.putBoolean("age", age.isChecked());
editor.commit();

• Relevant files:
  • https://github.com/blikoon/Ubufundi/blob/master/App5.3.0/app/src/main/java/com/blikoon/app530/MainActivity.java
• Direct link to app:
  • https://github.com/blikoon/Ubufundi/tree/master/App5.3.0