进度条不工作。安卓

我有一个包含两个活动的应用程序。当我切换到第二个活动时，数字是从 firebase 数据库中获取的，基于填充的进度条位于片段中。我的问题是，当我进入活动时，进度条没有填满，但如果我按下系统后退按钮（这将使我们返回到上一个活动），然后再次启动活动，进度条就会填满！我完全不知道为什么会这样。进度条填充在片段的 onCreateView() 中，对象是在活动的 onCreate() 中从数据库中读取的。重新创建片段时，没有任何变化，由此我得出结论，问题出在从数据库加载时。但是为什么会出现这个问题呢，因为我第二次去有fragment的activity的时候，执行的是和第一次执行的代码是一样的！

我真诚地希望得到你的支持，因为我不知道该怎么办了。

onCreate()方法代码：

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

    auth = FirebaseAuth.getInstance();
    user = auth.getCurrentUser();



    if (user != null) {
        // already signed in
        uid = user.getUid();
        name = user.getDisplayName();
        email = user.getEmail();
    } else {
        // not signed in
        startActivityForResult(
                AuthUI.getInstance()
                        .createSignInIntentBuilder()
                        .setProviders(Arrays.asList(new AuthUI.IdpConfig.Builder(AuthUI.EMAIL_PROVIDER).build(),
                                new AuthUI.IdpConfig.Builder(AuthUI.GOOGLE_PROVIDER).build()//,
                                // new AuthUI.IdpConfig.Builder(AuthUI.FACEBOOK_PROVIDER).build()
                                // new AuthUI.IdpConfig.Builder(AuthUI.TWITTER_PROVIDER).build()
                        ))
                        .build(),
                200);
    }

    database = FirebaseDatabase.getInstance();

    if (uid != null) {
        charRef = database.getReference("Users").child(uid).child("Character");

        charRef.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                // This method is called once with the initial value and again
                // whenever data at this location is updated.
                    myCharacter = dataSnapshot.getValue(Runner.class);
                    SnickNameBottom = myCharacter.getNickname();
                    currentSpeed = myCharacter.getSpeed();
                    currentStr = myCharacter.getStrength();
                    currentStamina = myCharacter.getStamina();
                    currentIntuition = myCharacter.getIntuition();
                    SlevelBottom = getString(R.string.level) + myCharacter.getCurrentLevel();
                    nickNameBottom = (TextView) findViewById(R.id.nickNameBottom);
                    levelBottom = (TextView) findViewById(R.id.levelBottom);
                    nickNameBottom.setText(SnickNameBottom);
                    levelBottom.setText(SlevelBottom);
                    stamFromEq = myCharacter.getStaminaFromEquipment();
                    strFromEq = myCharacter.getStrengthFromEquipment();
                    spdFromEq = myCharacter.getSpeedFromEquiment();
                    winsInARow = myCharacter.getWinsInARow();
                    wins = myCharacter.getWins();
                    defeats = myCharacter.getDefeats();
                    tournamentsTotal = myCharacter.getTournamentsTotal();
                    winsInTournaments = myCharacter.getWinsInTournaments();
            }

            @Override
            public void onCancelled(DatabaseError error) {
                // Failed to read value


            }
        });
    }
    if (savedInstanceState == null) {
        getFragmentManager()
                .beginTransaction()
                .add(R.id.container, new CardFrontFragment())
                .commit();
    }

}

片段 onCreateView() 方法代码：

@Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View view = inflater.inflate(R.layout.card_front, container, false);
            nickNameBottom = (TextView) view.findViewById(R.id.nickNameBottom);
            levelBottom = (TextView) view.findViewById(R.id.levelBottom);
            progressStr = (RoundCornerProgressBar) view.findViewById(R.id.strengthbar);
            progressSpd = (RoundCornerProgressBar) view.findViewById(R.id.speedbar);
            progressStamina = (RoundCornerProgressBar) view.findViewById(R.id.staminabar);
            progressIntuition = (RoundCornerProgressBar) view.findViewById(R.id.intuitionBar);

            nickNameBottom.setText(SnickNameBottom);
            levelBottom.setText(SlevelBottom);

            statsSum = (float) currentSpeed + currentStamina + currentStr;
            progressStr.setMax(statsSum);
            progressStr.setProgress((float)currentStr);
            progressStr.setSecondaryProgress((float) strFromEq);

            progressSpd.setMax(statsSum);
            progressSpd.setProgress((float)currentSpeed);
            progressSpd.setSecondaryProgress((float)spdFromEq);

            progressStamina.setMax(statsSum);
            progressStamina.setProgress((float)currentStamina);
            progressStamina.setSecondaryProgress((float)stamFromEq);

            progressIntuition.setMax(statsSum);
            progressIntuition.setProgress((float) currentIntuition);

            TextView totalPlayed = (TextView) view.findViewById(R.id.total);
            totalPlayed.setText(getString(R.string.total) + " " + (wins + defeats));

            TextView winsT = (TextView) view.findViewById(R.id.wins);
            winsT.setText(getString(R.string.wins) + " " + wins);

            TextView defeatsT = (TextView) view.findViewById(R.id.defeats);
            defeatsT.setText(getString(R.string.defeats) + " " + defeats);

            TextView tournamentsTotalT = (TextView) view.findViewById(R.id.tournamentsTotal);
            tournamentsTotalT.setText(getString(R.string.tournamentsTotal) + " " + tournamentsTotal);

            TextView tournamentsWinsT = (TextView) view.findViewById(R.id.tournamentsWins);
            tournamentsWinsT.setText(getString(R.string.tournamentsWins) + " " + winsInTournaments);

            TextView winsInARowT = (TextView) view.findViewById(R.id.winsInARow);
            winsInARowT.setText(getString(R.string.winsInARow) + " " + winsInARow);

            return view;

进行了一项实验，启动了活动，关闭了互联网，按下并重新启动 - 一切都被填满了。所以所有的数据都已经从第一次加载了。

这是一段视频，清楚地展示了一切。