在View Pager中使用View Pager时,不显示子视图寻呼机的项目

问题描述 投票:0回答:1

在我的应用程序中,父视图寻呼机有5个片段,其中2个在其中使用第二个视图寻呼机,其中包含另外5个片段。导航在父视图寻呼机中,我使用底部导航。在导航的孩子,我使用Tab布局。

问题是全视图,除了子视图寻呼机的视图显示在父视图中的viewpager.https://ibb.co/2ScB3N6

我注意到,如果孩子在到达最后一个项目后查看寻呼机的项目。例如,如果我到达最后一个项目,那么如果我去第二个项目那么它就会显示.https://ibb.co/jLdT9Zf

此外,如果我更改项目(其中有视图寻呼机)位置到第一,然后当时只是我正在显示它的项目,但当我将父视图寻呼机的项目更改为第二,然后转到第一,然后出现相同的问题。

父视图寻呼机代码适配器:

public class ViewPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }
    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

    @Override
    public int getCount() {
        return mFragmentList.size();
    }

    public void addFragment(Fragment fragment) {
        mFragmentList.add(fragment);
    }

    @Override
    public int getItemPosition(Object object) {
        // POSITION_NONE makes it possible to reload the PagerAdapter
        return POSITION_NONE;
    }
}

与parent viewpager Initialization相关的所有方法:

// ************ - 设置视图寻呼机 - *********************调用BottomNavigationmethod()和viewPagerMethod()进入onCreate

   private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        home=new Home();
        home.setArguments(HomeBundle);
        speed=new Speed();
        speed.setArguments(HomeBundle);
        rpm=new Rpm();
        rpm.setArguments(HomeBundle);
        spdRpm=new SpdRpm();
        spdRpm.setArguments(HomeBundle);
        dataRecord=new DataRecord();

        adapter.addFragment(home);
        adapter.addFragment(rpm);
        adapter.addFragment(dataRecord);
        adapter.addFragment(spdRpm);
        adapter.addFragment(speed);
        viewPager.setAdapter(adapter);
    }

// *************** - 底部导航方法 - ***********

    public void BottomNavigationmethod(){
        bottomNavigationView.setOnNavigationItemSelectedListener(
                new BottomNavigationView.OnNavigationItemSelectedListener() {
                    @Override
                    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                        switch (item.getItemId()) {
                            case R.id.action_home:
                                viewPager.setCurrentItem(0);

                                break;

                            case R.id.action_rpm:
                                viewPager.setCurrentItem(1);


                                break;
                            case R.id.action_dataRecord:
                                viewPager.setCurrentItem(2);


                                break;
                            case R.id.action_spdRpm:
                                viewPager.setCurrentItem(3);


                                break;
                            case R.id.action_speed:
                                viewPager.setCurrentItem(4);
                                break;

                        }
                        return false;
                    }
                });
    }

// **************** - 查看寻呼机方法 - ******

  public void viewPagerMethod(){

        GetCurrentItem=String.valueOf(viewPager.getCurrentItem());

        Log.d("getcurrntinside",GetCurrentItem);
        viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }


            @Override
            public void onPageSelected(int position) {
//                viewPager.getAdapter().notifyDataSetChanged();
                if (prevMenuItem != null) {
                    prevMenuItem.setChecked(false);
                }
                else
                {
                    bottomNavigationView.getMenu().getItem(0).setChecked(true);
                }    
                Position=String.valueOf(position);
                bottomNavigationView.getMenu().getItem(position).setChecked(true);
                prevMenuItem = bottomNavigationView.getMenu().getItem(position);

                OnViewPager=String.valueOf(bottomNavigationView.getMenu().getItem(position));


            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

        setupViewPager(viewPager);
    }

我的xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_home"
        android:checked="true"
        android:icon="@drawable/cartab"
        android:title="@string/HomeTab"
        app:showAsAction="always" />
    <item
        android:id="@+id/action_rpm"
        android:checked="false"
        android:icon="@drawable/rpmtab"
        android:title="@string/RpmTab"
        app:showAsAction="always" />


    <item
        android:id="@+id/action_dataRecord"
        android:checked="false"
        android:icon="@drawable/rpmtab"
        android:title="@string/DataRecordTab"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/action_spdRpm"
        android:checked="false"
        android:icon="@drawable/spdrpmtab"
        android:title="@string/SpeedRpmTab"
        app:showAsAction="ifRoom" />

    <item
        android:id="@+id/action_speed"
        android:checked="false"
        android:icon="@drawable/speedtab"
        android:title="@string/SpeedTab"
        app:showAsAction="always" />

</menu>

查看子视图寻呼机的寻呼机适配器:

public class ViewpageAdapterFrg extends FragmentPagerAdapter {
    public List<Fragment> fragmentList=new ArrayList<>();
    public List<String> fragmentTittle=new ArrayList<>();


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

    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmentTittle.size();
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return fragmentTittle.get(position);
    }

    public void fragmentAdd(Fragment fragment, String text){
       fragmentList.add(fragment);
       fragmentTittle.add(text);
    }
    @Override
    public int getItemPosition(Object object) {
        // POSITION_NONE makes it possible to reload the PagerAdapter
        return POSITION_NONE;
    }
}

与子视图寻呼机相关的方法:在创建时调用此方法

public void apptabview(){
    tabLayout=(TabLayout)view.findViewById(R.id.tabs);
    viewPager=(ViewPager)view.findViewById(R.id.viewpage);

    ViewpageAdapterFrg FirstAdapter=new ViewpageAdapterFrg(getActivity().getSupportFragmentManager());

    FirstAdapter.fragmentAdd(new NormalRpmFragment(),"Normal");
    FirstAdapter.fragmentAdd(new AwesomeRpmFragment(),"Awesome");
    FirstAdapter.fragmentAdd(new PointerRpmFragment(),"Pointer");
    FirstAdapter.fragmentAdd(new ProgressRpmFragment(),"Pointer");
    FirstAdapter.fragmentAdd(new DeluxeRpmFragment(),"Deluxe");

    viewPager.setAdapter(FirstAdapter);

    Log.d("speedViewFragemnt",String.valueOf(viewPager.getCurrentItem()));
    tabLayout.setupWithViewPager(viewPager);
}

我在子视图寻呼机的addOnPagerListen的各种事件中尝试了viewpager.getAdapter.notifyDatasetChanges(),但它冻结了应用程序。

android android-fragments navigation android-viewpager
1个回答
1
投票
 getChildFragmentManager()

返回一个私有FragmentManager,用于放置和管理Fragment中的Fragment。

 getSupportFragmentManager()

返回FragmentManager以与与此片段的活动关联的片段进行交互。

在与子视图寻呼机相关的方法中

ViewpageAdapterFrg FirstAdapter=new ViewpageAdapterFrg(getChildFragmentManager());

FirstAdapter.fragmentAdd(new NormalRpmFragment(),"Normal");
FirstAdapter.fragmentAdd(new AwesomeRpmFragment(),"Awesome");
FirstAdapter.fragmentAdd(new PointerRpmFragment(),"Pointer");
FirstAdapter.fragmentAdd(new ProgressRpmFragment(),"Pointer");
FirstAdapter.fragmentAdd(new DeluxeRpmFragment(),"Deluxe");

viewPager.setAdapter(FirstAdapter);

Log.d("speedViewFragemnt",String.valueOf(viewPager.getCurrentItem()));
tabLayout.setupWithViewPager(viewPager);
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