How to use sharedPreferences here?

Question

I have some spinners where I set values, four of them. I want them to retain the current settings between launches. When you select a value in the spinner it should not save that value until the updateSettings button is pressed. How do I go about this?

here is some code, in onCreate I make spinners with default values :

    mBaudSpinner = (Spinner) findViewById(R.id.bannerBaudSpinner);
    ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(
            this, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    mBaudSpinner.setAdapter(adapter);
    String[] tempArray = SlickUSB2Serial.BAUD_RATES;
    for (int i = 0; i < tempArray.length; i++) {
        adapter.add(tempArray[i]);
    }
     mBaudSpinner.setSelection(SlickUSB2Serial.BaudRate.BAUD_9600.ordinal());


    mDataSpinner = (Spinner) findViewById(R.id.bannerDataSpinner);
    adapter = new ArrayAdapter<CharSequence>(this,
            android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    mDataSpinner.setAdapter(adapter);
    tempArray = SlickUSB2Serial.DATA_BITS;
    for (int i = 0; i < tempArray.length; i++) {
        adapter.add(tempArray[i]);

    }
    mDataSpinner
            .setSelection(SlickUSB2Serial.DataBits.DATA_8_BIT.ordinal());

    mParitySpinner = (Spinner) findViewById(R.id.bannerParitySpinner);
    adapter = new ArrayAdapter<CharSequence>(this,
            android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    mParitySpinner.setAdapter(adapter);
    tempArray = SlickUSB2Serial.PARITY_OPTIONS;
    for (int i = 0; i < tempArray.length; i++) {
        adapter.add(tempArray[i]);

    }
    mParitySpinner.setSelection(SlickUSB2Serial.ParityOption.PARITY_NONE
            .ordinal());

    mStopSpinner = (Spinner) findViewById(R.id.bannerStopSpinner);
    adapter = new ArrayAdapter<CharSequence>(this,
            android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    mStopSpinner.setAdapter(adapter);
    tempArray = SlickUSB2Serial.STOP_BITS;
    for (int i = 0; i < tempArray.length; i++) {
        adapter.add(tempArray[i]);

    }
    mStopSpinner
            .setSelection(SlickUSB2Serial.StopBits.STOP_1_BIT.ordinal());

If I click updateSettings, this code is run:

else if (v == mUpdateSettings) {
            if (mSelectedAdapter == null) {
                return;
            }

            mSelectedAdapter.setCommSettings(BaudRate.values()[mBaudSpinner
                    .getSelectedItemPosition()], DataBits.values()[mDataSpinner
                    .getSelectedItemPosition()],
                    ParityOption.values()[mParitySpinner
                            .getSelectedItemPosition()],
                    StopBits.values()[mStopSpinner.getSelectedItemPosition()]);

   } 

I am trying to use preferences like this for one spinner as an example, is it on the right track?

 SharedPreferences prefs;
         prefs = PreferenceManager.getDefaultSharedPreferences(this);
         SharedPreferences.Editor prefEditor = prefs.edit();
         prefEditor.putString("savedValue",mBaudSpinner.getSelectedItem().toString());
         prefEditor.commit();
         String username = prefs.getString("savedValue", String.valueOf(SlickUSB2Serial.BaudRate.BAUD_9600.ordinal()));
         mBaudSpinner.setSelection(Integer.parseInt(username));

What do you do, do I make the sharedPrefs stuff global so that it can be used in both onCreate and in the button clicking listener? Then change the lines that set the default values for the spinners to something like this as an example:

String username = prefs.getString("savedValue", String.valueOf(SlickUSB2Serial.BaudRate.BAUD_9600.ordinal()));
             mBaudSpinner.setSelection(Integer.parseInt(username));

Then put the other stuff about saving the values in the button listener? I'm trying this but the state doesnt save and always defaults to the wrong value. Is what I am doing right?

EDIT

These lines do not seem to set the default value right, why is this?

prefs = PreferenceManager.getDefaultSharedPreferences(this);
         String username = prefs.getString("savedValue", Integer.toString(SlickUSB2Serial.BaudRate.BAUD_9600.ordinal()));
         mBaudSpinner.setSelection(Integer.parseInt(username)); 

Answer 1

Look, when you call:

 mBaudSpinner.getSelectedItem()

you got a object and convert it to string. When you call :

 mBaudSpinner.setSelection(Integer.parseInt(username))

you get the string and convert to int. However, the setSelectionshould receive an int position and getSelectedItem return a object and not the item position.