[android help] ObjectOutputStream not saving in custom class

I made my own custom class, and I can't figure out what's wrong with it. More specifically my question is what differences exist between making a class for android instead of Java. I mean, according to the logCat it doesn't throw any errors or anything. To the contrary, it tells me it that the InputStream reads correctly. For some reason I can't get it to save. At all. It doesn't throw errors or anything. It just doesn't save the parameters given. Any ideas? I think it's because I'm declaring the parameters for the method saveData incorrectly.

package com.eai.thepicker;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.util.Log;


public class DataHandler extends Activity {

    FileOutputStream file_out;
    FileInputStream file_in;
    ObjectOutputStream obj_out;
    ObjectInputStream obj_in;
    ArrayList retrieved_data, data_out;
    private boolean switch_1;
    private String tag;
    private String default_message;
    Context context;
    ArrayList data_given;

    public DataHandler(Context context_given){
        context = context_given;
    }

    @SuppressWarnings("unchecked")
    public ArrayList retrieveData(){
        tag = "DataHandler";
        default_message = "Tested";

        try {
            file_in = context.openFileInput("array_saved");
            obj_in = new ObjectInputStream(file_in);
            retrieved_data = (ArrayList) obj_in.readObject();
            obj_in.close();
            file_in.close();
            switch_1 = true;
            Log.d(tag, "Loaded");
            } catch (FileNotFoundException e) {
            Log.d(tag, "File Not Found Exception.");
            } catch (IOException e) {
                Log.d(tag, "IO Exception.");
            } catch (ClassNotFoundException e) {
                Log.d(tag, "Class Not Found Exception.");
            } 

        if (switch_1 == false);{
        retrieved_data = new ArrayList();
        retrieved_data.add(default_message);
    }

        return retrieved_data;

    }
    public void saveData(ArrayList data_given){
        try {
            file_out = context.openFileOutput("array_saved", 0);
            obj_out = new ObjectOutputStream(file_out);
            obj_out.writeObject(this.data_given);
            obj_out.close();
            file_out.close();
            Log.d(tag, "Loaded");
        } catch (FileNotFoundException e) {
        Log.d(tag, "File Not Found Exception.");
        } catch (IOException e) {
            Log.d(tag, "IO Exception.");
            } 
    }


}

.

stackoverflow.comm