Android append text file

I am tring to record the wake time and sleep time from a dialog picker to a text file like this, but the call to the method commitToFile2 doesn't append the text file "savedData.txt."

I know this code is very very dirty. I'm new to Java so any other suggestions would be greatly appreciated.

package com.buttinyourface;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.AdapterView.OnItemClickListener;

public class SettingsActivity extends Activity {

    public int wakeHour;
    public int wakeMinute;
    public int sleepHour;
    public int sleepMinute;
    public String sleepHourText = "No Data";
    public String sleepMinuteText = "No Data";
    public String outputTime = "No Data";
    public String wakeHourText = "No Data";
    private ListView lv;
    Dialog newDialogBox;
    Context appContext;
    protected Context context;
    static final private int WAKE_TIME = 0;
    static final private int SLEEP_TIME = 1;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings);
        final String[] settingsList = getResources().getStringArray(
                R.array.settingsStringArray);
        lv = (ListView) findViewById(R.id.list);
        TextView wakeHourTextView = (TextView) find