当父片段替换其他片段时，内容不会加载到选项卡布局片段中

Question

我有一个 MainActivIty，它支持两个片段，即 Home，Profile.Home 有一个 TabLayout，后者又包含三个片段 Trending、Followed 和 Nearby。所以问题是当 Home 第一次加载时它显示选项卡片段的内容和选项卡布局的滑块正确移动但是当我进入配置文件然后回到主页时选项卡布局片段不会加载并且从左向右滑动滑块不动smoothly.Here是代码。

public class MainActivity extends AppCompatActivity {

 ImageButton home_btn,myProfile_btn;
FragmentManager fragmentManager;
FragmentTransaction fragmentTransaction;
TextView txt_action_bar;
Home home;
ProfileFragment profile;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    home_btn=(ImageButton)findViewById(R.id.home_btn) ;
    discover_btn=(ImageButton)findViewById(R.id.discover_btn) ;
    myProfile_btn=(ImageButton)findViewById(R.id.profile_btn) ;
    notification_btn=(ImageButton)findViewById(R.id.notification_btn) ;
    plus_btn=(ImageButton)findViewById(R.id.btn_plus) ;

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
     txt_action_bar = (TextView)findViewById(R.id.toolbar_title);
    displayMetrics = getResources().getDisplayMetrics();
    Typeface custom_font = Typeface.createFromAsset(getAssets(),"fonts/NoteworthyLight.ttf");
    txt_action_bar.setTypeface(custom_font);


    setSupportActionBar(toolbar);
     fragmentManager = getSupportFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();
     home = new Home();
     profile = new ProfileFragment();
    fragmentTransaction.add(R.id.main_fragment_container,home,"home");
    fragmentTransaction.commit();


}

public void onClickHome(View view)
{


    fragmentManager = getSupportFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();

    fragmentTransaction.replace(R.id.main_fragment_container,home,"home");
    fragmentTransaction.commit();
}

public void onClickMyProfile(View view)
{

    fragmentManager = getSupportFragmentManager();
    fragmentTransaction = fragmentManager.beginTransaction();

    fragmentTransaction.replace(R.id.main_fragment_container,profile,"profile");

   fragmentTransaction.commit();
}

}

Home.java

public class Home extends Fragment {


private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;

public Home() {
    // Required empty public constructor
}



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

}

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

    mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());
    mViewPager = (ViewPager) view.findViewById(R.id.container);
    mViewPager.setAdapter(mSectionsPagerAdapter);
    TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);
    return view;
}

FollowedFragment.java

public class FollowedFragment extends Fragment {


public FollowedFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    final View rootView = inflater.inflate(R.layout.feeds_list, container, false);
    new DownloadFollowedFeeds().execute();
    return rootView;
}

fragment_home.xml

<LinearLayout android:layout_below="@+id/header"
android:layout_above="@+id/footer"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_gravity="center_vertical"
android:orientation="vertical"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.design.widget.TabLayout
    android:id="@+id/tabs"
    style="@style/TabNameStyle"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/medium_turquoise"
    app:tabGravity="fill"
    app:tabMode="fixed" />

<android.support.v4.view.ViewPager
    android:id="@+id/container"
    android:layout_width="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    android:layout_height="fill_parent"/>

SectionPagerAdapter.java

public class SectionsPagerAdapter extends FragmentPagerAdapter {

private String tabTitles[] = new String[] { "Trending", "Followed","Nearby" };


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 PlaceholderFragment (defined as a static inner class below).
    Log.i("tag","number"+String.valueOf(position));
    if(position==0)  return  new TrendingFragment();
    else if(position==1)    return new FollowedFragment();
    else return new NearbyFragment();
}

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

@Override
public CharSequence getPageTitle(int position) {
    return tabTitles[position];
}

}

Answer 1

如回答here：

当您在 Home.java 中创建视图适配器时：

而不是

mSectionsPagerAdapter = new SectionsPagerAdapter(getFragmentManager());

你应该做的，

mSectionsPagerAdapter = new SectionsPagerAdapter(getChildFragmentManager());

当父片段替换其他片段时，内容不会加载到选项卡布局片段中

Content does not load in tab layout fragment when the parent fragment is replacing other fragment

android

fragment

android-tablayout

fragmentpageradapter