Question

I have over 100 different checkboxes in 6 activites and i would like to save the state of each, so that when i switch from one activity to another, it remains checked. Do i really have to create over 100 booleans to save each checkbox separately or is there an easier way to save and read out the states? I thought of using a loop but i cant really think of an intelligent way to do this. Would be great if anyone could help!
This is an example of one of my checkboxes: Its supposed to add a String to an ArrayList object when the box gets klicked and delete the String when the box gets unchecked. It works fine, but when i leave eg. Actvity1, go into Activity2 and come back to Acivity1 to uncheck one of my checkboxes, the string is added to my ArrayList a second time instead of beeing removed.

    myBox1.setOnClickListener(new OnClickListener() {
        @Override

        public void onClick(View v) {
            if (myBox1.isChecked() == true)
                helperActivity.myStringArrayList.add("myString1");

            else {
        helperActivity.myStringArrayList.remove("myString1");}
        }           
    });

Answer 1

One option would be to use Shared Preferences to save the checked state for each of your checkboxes.

// Access the default SharedPreferences
SharedPreferences preferences = 
  PreferenceManager.getDefaultSharedPreferences(this);

...

SharedPreferences.Editor editor = preferences.edit();
// Save the checked state
editor.putBoolean("myBox1", true);
editor.commit();

...

// Get and set the checked state
boolean myBox1State = preferences.getBoolean("myBox1", false);
myBox1.setChecked(myBox1State);

The advantage of this scheme is that these settings will survive application restarts.