SharedPreferences example

public class Main extends Activity implements CompoundButton.OnCheckedChangeListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        CheckBox cb1, cb2, cb3;

        cb1 = (CheckBox)findViewById(R.id.checkBox1);
        cb1.setChecked(getFromSp("cb1"));
        cb1.setOnCheckedChangeListener(this);
        cb2 = (CheckBox)findViewById(R.id.checkBox2);
        cb2.setChecked(getFromSp("cb2"));
        cb2.setOnCheckedChangeListener(this);
        cb3 = (CheckBox)findViewById(R.id.checkBox3);
        cb3.setChecked(getFromSp("cb2"));
        cb3.setOnCheckedChangeListener(this);
    }

    private boolean getFromSp(String key){
        SharedPreferences preferences = getApplicationContext().getSharedPreferences("SharedPreferences_Test",
                Context.MODE_MULTI_PROCESS);
        return preferences.getBoolean(key, false);
    }

    private void saveInSp(String key, boolean value){
        SharedPreferences preferences = getApplicationContext().getSharedPreferences("SharedPreferences_Test",
                Context.MODE_MULTI_PROCESS);
        SharedPreferences.Editor editor = preferences.edit();
        editor.putBoolean(key, value);
        editor.commit();
    }

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        switch (buttonView.getId()){
            case R.id.checkBox1:
                saveInSp("cb1", isChecked);
                break;
            case R.id.checkBox2:
                saveInSp("cb2", isChecked);
                break;
            case R.id.checkBox3:
                saveInSp("cb3", isChecked);
                break;
        }
    }
}