显示 Fragment 时，应用程序永远冻结

Question

自从我实现了BottomAppBar 后，即使我没有更改任何内容，当某个片段应该显示时，我的应用程序也没有响应。也没有错误消息，当单击 BottomNavigationBar 中的另一个项目时显示的所有其他片段都可以正常工作。

片段：

public class StatisticsFragment extends Fragment {

private TabLayout mTabLayout;
private ViewPager mViewPager;

private BankAccountsStatisticsFragment bankAccountsStatisticsFragment = new BankAccountsStatisticsFragment();
private BillsStatisticsFragment billsStatisticsFragment = new BillsStatisticsFragment();
private CategoriesStatisticsFragment categoriesStatisticsFragment = new CategoriesStatisticsFragment();
private GoalsStatisticsFragment goalsStatisticsFragment = new GoalsStatisticsFragment();


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View inflatedView = inflater.inflate(R.layout.fragment_statistics, container, false);

    mTabLayout = (TabLayout) inflatedView.findViewById(R.id.tl_statistics);
    mViewPager = (ViewPager) inflatedView.findViewById(R.id.vp_statistics);

    mViewPager.setAdapter(new Adapter(getChildFragmentManager()));
    mTabLayout.setupWithViewPager(mViewPager);

    return inflatedView;
}

private class Adapter extends FragmentPagerAdapter {

    private static final int TABS = 4;

    public Adapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        switch (position){
            case 0: return bankAccountsStatisticsFragment;
            case 1: return billsStatisticsFragment;
            case 2: return categoriesStatisticsFragment;
            case 3: return goalsStatisticsFragment;
            default: throw new IllegalStateException("Couldn't find a fragment for position " + position);
        }
    }

    @Override
    public CharSequence getPageTitle(int position) {
        switch (position){
            case 0: return getString(R.string.tab_bank_accounts);
            case 1: return getString(R.string.tab_bills);
            case 2: return getString(R.string.tab_categories);
            default: return getString(R.string.tab_goals);
        }
    }

    @Override
    public int getCount() {
        return TABS;
    }
}

}

LOGCAT

LOGCAT

Answer 1

膨胀布局和创建片段过渡（如“FragmentManager....replace().commit()”）是在渲染 UserInterface 的 MainThread 中完成的，因此 UserInterface 将在这些时刻冻结。 我认为您必须预先加载“坏”片段，然后将其隐藏而不是销毁它……这样下次您要创建它时就已经准备好了。