片段布局仅在可能的情况下更新

Question

我有两个片段。第二个片段的内容取决于第一个片段的用户输入。

因此，如果用户在第一个片段中放置0，我想显示第一个LinearLayout，如果他放1，我想显示第二个LinearLayout。两个LinearLayouts都在同一个xml文件中。

我的代码有效（见下文）。但它只适用于ONCE。在第一次调用时，它会执行它应该执行的所有操作。但是在以下所有调用中，setVisibility命令似乎不再起作用（同时控制台打印工作没有问题）。

    public class SectionsPagerAdapter extends FragmentPagerAdapter {

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

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a DummySectionFragment (defined as a static inner class
        // below) with the page number as its lone argument.
        Fragment fragment = new DummySectionFragment();
        Bundle args = new Bundle();
        args.putInt(DummySectionFragment.ARG_SECTION_NUMBER, position+1);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        Locale l = Locale.getDefault();
        switch (position) {
        case 0:
            return getString(R.string.title_section1).toUpperCase(l);
        case 1:
            return getString(R.string.title_section2).toUpperCase(l);
        case 2:
            return getString(R.string.title_section3).toUpperCase(l);
        }
        return null;
    }
}

public static class DummySectionFragment extends Fragment {
    public static final String ARG_SECTION_NUMBER = "section_number";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        System.out.println("test"+unitOfMeasurement);
        View rootView;
        View unitView = inflater.inflate(R.layout.fragment_personalization_unit, container, false);
        View boundaryView = inflater.inflate(R.layout.fragment_personalization_low, container, false);
        switch(getArguments().getInt(ARG_SECTION_NUMBER)) {
        case 1:
            rootView = unitView;
        break;
        case 2:
            rootView = boundaryView;
        break;
        default:
            rootView = inflater.inflate(R.layout.fragment_personalization_dummy, container, false);
        }

        setupUnitClickListener(unitView, boundaryView);
        setupInputFields(boundaryView);

        return rootView;
    }

    private void setupInputFields(View view) {
        view.findViewById(R.id.fragment_personalization_mmol_low_picker).setVisibility(View.VISIBLE);
        view.findViewById(R.id.fragment_personalization_mgdl_low_picker).setVisibility(View.VISIBLE);

        if(unitOfMeasurement==1) {
            view.findViewById(R.id.fragment_personalization_mmol_low_picker).setVisibility(View.GONE);
            System.out.println("mmol gone");
        } else if(unitOfMeasurement==0) {
            view.findViewById(R.id.fragment_personalization_mgdl_low_picker).setVisibility(View.GONE);
            System.out.println("mgdl gone");
        }

        /*switch(unitOfMeasurement) {
        case 0: //it's mmol/l
            view.findViewById(R.id.fragment_personalization_mgdl_low_picker).setVisibility(View.VISIBLE);

            final EditText val1 = (EditText) view.findViewById(R.id.fragment_personalization_low_mmol_value1);
            final EditText val2 = (EditText) view.findViewById(R.id.fragment_personalization_low_mmol_value2);
            System.out.println("testtt");
        break;
        case 1: //it's mg/dl
            LinearLayout lin = (LinearLayout) view.findViewById(R.id.fragment_personalization_mgdl_low_picker);
            lin.setVisibility(View.VISIBLE);

            final EditText val3 = (EditText) view.findViewById(R.id.fragment_personalization_low_mgdl_value1);
            System.out.println("gettinasd here"+unitOfMeasurement);
        break;
        }*/
    }

    private void setupUnitClickListener(View view, final View boundaryView) {
        final TextView mmoll = (TextView) view.findViewById(R.id.fragment_personalization_unit_option1);
        final TextView mgdl = (TextView) view.findViewById(R.id.fragment_personalization_unit_option2);

        if(unitOfMeasurement==0) { //using mmol
            mmoll.setTextColor(Color.parseColor("#920d0a"));
            mmoll.setBackgroundColor(Color.parseColor("#44525252"));
            mgdl.setTextColor(Color.parseColor("#525252"));
            mgdl.setBackgroundColor(Color.parseColor("#ffffffff"));
        } else { //using mg/dl
            mgdl.setTextColor(Color.parseColor("#920d0a"));
            mgdl.setBackgroundColor(Color.parseColor("#44525252"));
            mmoll.setTextColor(Color.parseColor("#525252"));
            mmoll.setBackgroundColor(Color.parseColor("#ffffffff"));
        }

        mmoll.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                mmoll.setTextColor(Color.parseColor("#920d0a"));
                mmoll.setBackgroundColor(Color.parseColor("#44525252"));
                mgdl.setTextColor(Color.parseColor("#525252"));
                mgdl.setBackgroundColor(Color.parseColor("#ffffffff"));
                unitOfMeasurement = 0;
            }
        });

        mgdl.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                mgdl.setTextColor(Color.parseColor("#920d0a"));
                mgdl.setBackgroundColor(Color.parseColor("#44525252"));
                mmoll.setTextColor(Color.parseColor("#525252"));
                mmoll.setBackgroundColor(Color.parseColor("#ffffffff"));
                unitOfMeasurement = 1;
            }
        });
    }
}

对于凌乱的代码感到抱歉，我也尝试了另一种方式（设置所有可见性，然后显示一个）。第一次通话后，一切都不再有用了。

编辑：添加了整个代码。所有这些，除了虚拟类都是由Android SDK创建的。