OnClick要片段切片结果在空白屏幕

Question

当从一个片段切换到另一个片段（在我的应用程序的第二个选项卡内）时，我的第二个片段是空白的。我试图在这里挂的解决方案，但没有一个似乎工作：

Transaction of fragments in android results in blank screen

Android: Getting white screen with fragment transaction

MainActivity：

public class MainActivity extends AppCompatActivity { 

    private SectionsPagerAdapter mSectionsPagerAdapter; 
    private ViewPager mViewPager; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main_activity); 

     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 

     // Set up the ViewPager with the sections adapter, and add pages. 
     mViewPager = (ViewPager) findViewById(R.id.container); 
     mSectionsPagerAdapter.addPage(new Received()); 
     mSectionsPagerAdapter.addPage(new Send()); 
     mViewPager.setAdapter(mSectionsPagerAdapter); 

     TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs); 
     tabLayout.setupWithViewPager(mViewPager); 

    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_alert_partners, menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     int id = item.getItemId(); 

     //noinspection SimplifiableIfStatement 
     if (id == R.id.action_settings) { 
      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 
     /** 
     * The fragment argument representing the section number for this 
     * fragment. 
     */ 
     private static final String ARG_SECTION_NUMBER = "section_number"; 

     public PlaceholderFragment() { 
     } 


     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
           Bundle savedInstanceState) { 
      if(getArguments().getInt(ARG_SECTION_NUMBER)==1) { 
       View rootView = inflater.inflate(R.layout.fragment_received, container, false); 
       return rootView; 
      } 
      else if(getArguments().getInt(ARG_SECTION_NUMBER)==2) { 
       View rootView = inflater.inflate(R.layout.fragment_send, container, false); 
       return rootView; 
      } 
      else {//main empty fragment in case of error. Never used in normal behaviour. 
       View rootView = inflater.inflate(R.layout.fragment_alert_partners, container, false); 
       return rootView; 
      } 
     } 
    } 


    public class SectionsPagerAdapter extends FragmentPagerAdapter { 

     //Create an Array list that will hold the pages. 
     ArrayList<Fragment> pages = new ArrayList<>(); 

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

     @Override 
     public Fragment getItem(int position) { 
      // getItem is called to instantiate the fragment for the given page. 
      return pages.get(position); 
     } 

     //Add a page 
     public void addPage(Fragment f) { 
      pages.add(f); 
     } 

     @Override 
     public int getCount() { 
      // Show 2 total pages. 
      return 2; 
     } 

     @Override 
     public CharSequence getPageTitle(int position) { 
      switch (position) { 
       case 0: 
        return "Received"; 
       case 1: 
        return "Send"; 

      } 
      return null; 
     } 
    } 
} 

SendFragment：

public class Send extends Fragment { 

    private OnFragmentInteractionListener mListener; 
    private TextView text1; 


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

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

    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     View v = inflater.inflate(R.layout.fragment_send, container, false); 

     //Need getView() for fragment since setContentView must be set first but is not possible in fragment. 
     text1 = (TextView)v.findViewById(R.id.textview1);   

     text1.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
           FragmentManager fragmentManager = getFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
      Send2 send2 = new Send2(); 
      fragmentTransaction.addToBackStack(null); 
      fragmentTransaction.hide(Send.this); 
      fragmentTransaction.add(android.R.id.content, send2); 
      fragmentTransaction.addToBackStack(null); 
      fragmentTransaction.commit(); 
      } 
     }); 

     return v; 
    } 

    public interface OnFragmentInteractionListener { 

    } 
} 

Send2Fragment：

public class Send2 extends Fragment { 

    private OnFragmentInteractionListener mListener; 

    public Send2() { 
     // Required empty public constructor 
    } 

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

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     // Inflate the layout for this fragment 
     final View v = inflater.inflate(R.layout.fragment_send2, container, false); 
     return v; 
    } 


    @Override 
    public void onAttach(Context context) { 
     super.onAttach(context); 
    } 

    @Override 
    public void onDetach() { 
     super.onDetach(); 
     mListener = null; 
    } 

    public interface OnFragmentInteractionListener { 

    } 
} 

Answer 1

只好在用于我被替换片段布局代码的末尾添加一个的FrameLayout：

<FrameLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:id="@+id/send1frameLayoutId"> 
</FrameLayout> 

然后使用此代码可切换到在先前的片段的相同标签的片段：

  Fragment send2 = new Send2(); 
      FragmentManager fragmentManager = getChildFragmentManager(); 
      FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 

      fragmentTransaction.replace(R.id.send1frameLayoutId, send2); 

      fragmentTransaction.addToBackStack(null); 
      fragmentTransaction.commit();