從主要活動發送包數據到片段

Question

我有一個活動與兩個選項卡上的片段，我試圖發送一個變量從主類使用包的片段。

但我不能收到任何信息，我只是空。

謝謝你的幫助！

public class DetailedInfo extends AppCompatActivity { 

    private SectionsPagerAdapter mSectionsPagerAdapter; 
    private ViewPager mViewPager; 


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

     /////INFO, I WANT TO SEND 
     InfoFragment fragment = new InfoFragment(); 
     Bundle args = new Bundle(); 
     args.putString("key", "text i want to send"); 
     fragment.setArguments(args); 
     //// 


     //TABS setup 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     // Create the adapter that will return a fragment for each of the two 
     // primary sections of the activity. 
     mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 

     // Set up the ViewPager with the sections adapter. 
     mViewPager = (ViewPager) findViewById(R.id.container); 
     mViewPager.setAdapter(mSectionsPagerAdapter); 

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

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.menu_detailed_info, menu); 
     return true; 
    } 

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

    } 


    public class SectionsPagerAdapter extends FragmentStatePagerAdapter { 

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

     @Override 
     public Fragment getItem(int position) { 
      switch (position) { 
       case 0: 
        return PicturesFragment.newInstance(position + 1); 
       case 1: 
        return InfoFragment.newInstance(position + 1); 


      } 
      return null; 

     } 

     @Override 
     public int getCount() { 
      return 2; 
     } 

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

      } 
      return null; 
     } 
    } 

    public static class PicturesFragment extends Fragment { 

     private static final String ARG_SECTION_NUMBER = "section_number"; 

     public static PicturesFragment newInstance(int sectionNumber) { 
      PicturesFragment fragment = new PicturesFragment(); 
      Bundle args = new Bundle(); 
      args.putInt(ARG_SECTION_NUMBER, sectionNumber); 
      fragment.setArguments(args); 
      return fragment; 
     } 

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

      return detailedpictures; 
     } 
    } 

    public static class InfoFragment extends Fragment { 

     private static final String ARG_SECTION_NUMBER = "section_number"; 

     public static InfoFragment newInstance(int sectionNumber) { 
      InfoFragment fragment = new InfoFragment(); 
      Bundle args = new Bundle(); 
      args.putInt(ARG_SECTION_NUMBER, sectionNumber); 
      fragment.setArguments(args); 
      return fragment; 
     } 

     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
      View detailedinfo = inflater.inflate(R.layout.fragment_detailed_info, container, false); 

      ////INFO, I WANT TO RECEIVE 
      Bundle bundle = getArguments(); 
      String customtext = bundle.getString("key"); 
      TextView detailtext= (TextView)detailedinfo.findViewById(R.id.info); 
      detailtext.setText(customtext); 
      //// 

      return detailedinfo; 
     } 
    } 
} 

Answer 1

既然你不使用你的片段sectionNumber我建議如下：

public static class InfoFragment extends Fragment { 

public static InfoFragment newInstance(String value) { 
    InfoFragment fragment = new InfoFragment(); 
    Bundle args = new Bundle(); 
    args.putInt("key", value); 
    fragment.setArguments(args); 
    return fragment; 
} 

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View detailedinfo = inflater.inflate(R.layout.fragment_detailed_info, container, false); 

    ////INFO, I WANT TO RECEIVE 
    Bundle bundle = getArguments(); 
    String customtext = bundle.getString("key"); 
    TextView detailtext= (TextView)detailedinfo.findViewById(R.id.info); 
    detailtext.setText(customtext); 
    //// 

    return detailedinfo; 
} 

}

public class SectionsPagerAdapter extends FragmentStatePagerAdapter { 

private InfoFragment infoFragment; 
private PictureFragment picFragment; 

public SectionsPagerAdapter(FragmentManager fm, InfoFragment infoFrg, PictureFragment picFrg) { 
    super(fm); 
    this.infoFragment = infoFrg; 
    this.picFragment = picFrg; 
} 

@Override 
public Fragment getItem(int position) { 
    switch (position) { 
     case 0: 
      return infoFragment; 
     case 1: 
      return picFragment; 
    } 
    return null; 
} 

最後：

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

    /////INFO, I WANT TO SEND 
    InfoFragment infoFragment = InfoFragment.newInstance("text I want to send"); 
    //// 
    PictureFragment picFrament = PictureFragment.newInstance(0); 

    //TABS setup 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
    // Create the adapter that will return a fragment for each of the two 
    // primary sections of the activity. 
    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager(), infoFragment, picFragment); 

    // Set up the ViewPager with the sections adapter. 
    mViewPager = (ViewPager) findViewById(R.id.container); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 

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