无法在片段

Question

我正在尝试以下示例代码。即使我的文本视图以类似的方式更新。在seekbar.setProgress（45）它抛出一个空指针异常，好像它还没有找到了搜索栏..任何想法为什么？所有textview和seekbar都以类似的方式在onCreateView和onStart中初始化。除了那个搜索栏监听器被称为适当的ontouch拖动等..

public class HomeMenuFragment extends Fragment {

    TextView tvHomeMenuText;
    TextView tvHomeMenuTextUnit;
    ImageButton btnHomeMenu;
    public SeekBar menuSeek;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        final View v = inflater.inflate(R.layout.fragment_home, container, false);

        menuSeek = (SeekBar) v.findViewById(R.id.sbHomeMenu);
        tvHomeMenuText = (TextView) v.findViewById(R.id.tvHomeMenuText);
        tvHomeMenuTextUnit = (TextView) v.findViewById(R.id.tvHomeManuTextUnit);
        btnHomeMenu = (ImageButton) v.findViewById(R.id.btnHomeMenu);

        return v;
    }

    @Override
    public void onStart() {
        super.onStart();


        /* Set Typeface */
        AssetManager am = getActivity().getAssets();
        Typeface typeface = Typeface.createFromAsset(am, String.format(Locale.US, "fonts/%s", "century_gothic_bold.ttf"));
        tvHomeMenuText.setTypeface(typeface);
        tvHomeMenuTextUnit.setTypeface(typeface);

        menuSeek.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            int translatedProgress;

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean b) {
                    translatedProgress = progress + 60;
                    tvHomeMenuText.setText(Integer.toString(translatedProgress));
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {


                        tvHomeMenuText.setText(Integer.toString(translatedProgress));

                             }

        });

        menuSeek.setProgress(75);


        final Handler handler = new Handler();

        handler.post(new Runnable() {
            @Override
            public void run() {

                tvHomeMenuText.setText("--");
                tvHomeMenuTextUnit.setText("--");
                menuSeek.setProgress(45);

                // upadte textView here
                handler.postDelayed(this, 500); // set time here to refresh textView

            }
        });
    }


    @Override
    public void onResume() {
        super.onResume();
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        return false;
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        getActivity().getMenuInflater().inflate(R.menu.main, menu);
        super.onCreateOptionsMenu(menu, inflater);
    }
}