android.support.v4.app.Fragment.setArguments(android.os.Bundle)' 在空对象引用上

Question

在一些非常罕见的情况中，这条线路会发生崩溃:

mCurrentDialogFragment.get().setArguments(bundle);

protected void showDateTimePickerDialog() {
        mCurrentDialogFragment = new WeakReference<AppCompatDialogFragment>(new DateTimePickerDialogFragment());
        ((DateTimePickerDialogFragment) mCurrentDialogFragment.get()).setOnDateTimeSelectedListener(
                new DateTimePickerDialogFragment.OnDateTimeSelectedListener() {
                    @Override
                    public void onCancelled() {
                    }

                    @Override
                    public void onDateTimeSet(int year, int monthOfYear, int dayOfMonth,
                                              int hourOfDay, int minute) {
                        ...
                });

        DateTime dt = new DateTime(mCalendarTimeLineAdapter.convertPositionToMs(
                mViewPager.getCurrentItem()));

        if (mCurrentDialogFragment != null && mCurrentDialogFragment.get() != null) {
            Pair<Boolean, SublimeOptions> optionsPair =
                    TimeUtils.getDateTimePickerOptionsForDiary(mScheduleRange,
                            new DateTime(dt), mCalendarTimeLineAdapter.getCalendarTodayPosition());

            Bundle bundle = new Bundle();
            bundle.putParcelable(DateTimePickerDialogFragment.BUNDLE_KEY_DATETIME_OPTIONS, optionsPair.second);

            // **** CRASH HERE
            mCurrentDialogFragment.get().setArguments(bundle);

            mCurrentDialogFragment.get().setStyle(android.support.v4.app.DialogFragment.STYLE_NO_TITLE, 0);
            mCurrentDialogFragment.get().show(getSupportFragmentManager(), TAG);
        }
    }

怎么可能？我不明白引用怎么可以为空...

大家有什么解释吗？

非常感谢

Answer 1

尝试初始化您的 Dialoig mCurrentDialogFragment = null 然后分配给它。