轻扫后，ViewPager不会重绘内容

时间：2017-02-06 11:19:44

标签： android android-fragments android-viewpager

问题

我是Android的新手，我在我的应用程序中第一次使用viewpager 我在我的应用程序中遇到了非常奇怪的行为，即我正在使用包含三个片段的viewpager（TrackFragment，AlbumFragment，ArtistFragment）以及当我从 TrackFragment 转换到 AlbumFragment 时再次回到 TrackFragment 它变成空白（但最初不是我最初在 TrackFragment 时）并且当我跳到 ArtistFragment <时发生同样的事情/ strong>或标签布局中的任何其他片段（变为空白）。

如果我从 TrackFragment 通过 AlbumFragments 通过 AlbumFragments 打开 ArtistFragment ，则可以正常工作（即内容已显示）在页面）。

请建议我一种方法来克服上述问题或任何其他方法来实现相同的东西。 这是我的代码......

MainActivity 

public class MainActivity extends AppCompatActivity {
private String[] mPlanetTitles={"Tracks","Album","Artist"};
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
SharedPreferences sharedPreferences;
Fragment [] fragments = {new TracksFragment(),new AlbumFragment(), new ArtistFragment()};
PagerAdapter pagerAdapter;
   ViewPager viewPager;
   public static ImageView im;
   int pos= -1 ;
   public static Context context;
   MusicService musicService;
   boolean mBound;
   TabLayout tabLayout ;
   public static Uri currentsonguri;
   protected void onCreate(final Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       sharedPreferences = getSharedPreferences("lastplayed",Context.MODE_PRIVATE);

       Intent i = new Intent(MainActivity.this,MusicService.class);
       startService(i);
       mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
       mDrawerList = (ListView) findViewById(R.id.left_drawer);
       mDrawerList.setAdapter(new NavigationDrawerAdapter(this));
       mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
           @Override
           public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
               if(position == 3)
               {
                   Intent i = new Intent(MainActivity.this,PlaylistActivity.class);
                    startActivity(i);
               }
               if(position == 4)
               {
                   Intent intent = new Intent();
                   intent.setAction("android.media.action.DISPLAY_AUDIO_EFFECT_CONTROL_PANEL");
                   if((intent.resolveActivity(getPackageManager()) != null)) {
                       startActivity(intent);
                   } else {
                       // No equalizer found :(
                       Toast.makeText(getBaseContext(),"No Equaliser Found",Toast.LENGTH_LONG).show();
                   }
               }

           }
       });

       tabLayout = (TabLayout) findViewById(R.id.tablayout);
       viewPager = (ViewPager) findViewById(R.id.viewPager);
       tabLayout.setTabTextColors(Color.DKGRAY,Color.WHITE);
       tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
       context = getBaseContext();
       pagerAdapter = new myfragment(getSupportFragmentManager());


       im  = (ImageView) findViewById(R.id.currentsong);
               viewPager.setPageTransformer(true, new ZoomOutPageTransformer());
               viewPager.setAdapter(pagerAdapter);
               tabLayout.setupWithViewPager(viewPager,true);

       SharedPreferences.Editor editor= sharedPreferences.edit();
       if(sharedPreferences.getInt("count",0)==0)
       {
           editor.putInt("count",1);
       }
       else
       {
           int c= sharedPreferences.getInt("count",0);
           Log.d("Uses count",c+"");
           editor.putInt("count",c++);
           editor.apply();
       }
       if(!sharedPreferences.getString("uri","").equals(""))
       {
          String s = sharedPreferences.getString("uri","");
           Uri u = Uri.parse(s);
           currentsonguri = u;
           MediaMetadataRetriever data=new MediaMetadataRetriever();
           data.setDataSource(getBaseContext(),u);
           try {
               byte[] b = data.getEmbeddedPicture();
               Bitmap bitmap = BitmapFactory.decodeByteArray(b, 0, b.length);
               bitmap = getRoundedCornerBitmap(bitmap);
               im.setImageBitmap(bitmap);
           }
           catch (Exception e)
           {
               e.printStackTrace();
           }

           try {
               musicService.setsongbyuri(u,getBaseContext());
               musicService.setMediaPlayer();
           }
           catch (Exception e)
           {
               e.printStackTrace();
           }
       }
       else
       {

       }
       editor.apply();
       im.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
          Intent intent = new Intent(MainActivity.this, MusicPlayerActivity.class);
          intent.setData(currentsonguri);
          intent.putExtra("flag",1);
          startActivity(intent);
      }
  });



       final Uri r= getIntent().getData();
          if(r!=null) {
              currentsonguri = r;
              Intent intent = new Intent(MainActivity.this, MusicPlayerActivity.class);
              intent.setData(r);
              intent.putExtra("flag",0);
              startActivity(intent);

          }
       }

public class myfragment extends FragmentPagerAdapter {

    myfragment(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        return fragments[position];
    }

    @Override
    public int getCount() {
        return 3;
    }

    @Override
    public CharSequence getPageTitle(int position) {
        String s = "non";
        switch (position)
        {
            case 0 : s= "Tracks" ;
                break;
            case 1: s= "Albums" ;
                break;
            case 2: s= "Artist" ;
                break;
        }
        return s;
    }


}

public void setview(byte [] b, int position,Uri uri)
{
    currentsonguri = uri;
    Log.d("position in set view",""+position);
    Log.d("fail","i am here");
    if(im!=null)
    {
        if(b!=null)
        {
            Bitmap bitmap = BitmapFactory.decodeByteArray(b, 0, b.length);
            bitmap = getRoundedCornerBitmap(bitmap);
            im.setImageBitmap(bitmap);
        }
        else {
            songDetailloader loader = new songDetailloader(context);
            String s = loader.albumartwithalbum(loader.songalbum(position));
            Log.d("fail","fail to set small image");
            if (s != null) {
                im.setImageBitmap(BitmapFactory.decodeFile(s));
                Log.d("fail","nowsetting set small image");
            } else {
                im.setImageResource(R.drawable.default_track_light);
                Log.d("ic","ic_launcher setted");
            }

        }
    }
    else {
        Log.d(""," im is null");
    }
}



public static Bitmap getRoundedCornerBitmap(Bitmap bitmap) {
    Bitmap output = Bitmap.createBitmap(bitmap.getWidth(),
            bitmap.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(output);

    final int color = 0xff424242;
    final Paint paint = new Paint();
    final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
    final RectF rectF = new RectF(rect);
    final float roundPx = 100;

    paint.setAntiAlias(true);
    canvas.drawARGB(0, 0, 0, 0);
    paint.setColor(color);
    canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(bitmap, rect, rect, paint);

    return output;
}


private ServiceConnection serviceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        MusicService.LocalBinder binder = (MusicService.LocalBinder) service;
        musicService  =  binder.getService();
        mBound =true;
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        mBound =false;
    }
};

@Override
protected void onDestroy() {
    super.onDestroy();
    Log.d("MainActivity","Get distoryed");
}

@Override
protected void onResume() {
    super.onResume();
    Intent i = new Intent(this,MusicService.class);
    bindService(i, serviceConnection, Context.BIND_AUTO_CREATE);
}

@Override
protected void onStart() {
    super.onStart();

}


@Override
protected void onStop() {
    super.onStop();
    unbindService(serviceConnection);

}}

跟踪片段 

public class TracksFragment extends Fragment {
songDetailloader loader = new songDetailloader();
ArrayList<Songs> give = new ArrayList<>();
public int pos = -1;
MediaPlayer mp ;
MusicService musicService;
boolean mBound;
ImageView search;
ListViewAdapter listViewAdapter;
RelativeLayout editreltive;
ListView listView;
EditText editText;
TextView ch;
private Cursor cursor ;
int albumindex,dataindex,titleindex,durationindex,artistindex;
private final static String[] columns ={MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.TITLE, MediaStore.Audio.Media.IS_MUSIC,MediaStore.Audio.Media.IS_RINGTONE,MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.SIZE ,MediaStore.Audio.Media._ID};
private final String where = "is_music AND duration > 10000 AND _size <> '0' ";
private final String orderBy =  MediaStore.Audio.Media.TITLE;
public TracksFragment() {

}

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.d("fragment created","created");
    setRetainInstance(true);


}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable final ViewGroup container, @Nullable Bundle savedInstanceState)
{
    View v =inflater.inflate(R.layout.listviewofsongs,container,false);
    listView = (ListView) v.findViewById(R.id.listView);
    allsongs();
    intlistview();
    new Thread(new Runnable() {
        @Override
        public void run() {
            Intent i = new Intent(getActivity(),MusicService.class);
            getActivity().bindService(i, serviceConnection, Context.BIND_AUTO_CREATE);
        }
    }).start();
    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id)
        {
            Log.d("Uri of ",""+give.get(position).getSonguri());
            musicService.setplaylist(give,give.get(position).getPosition());
            musicService.setMediaPlayer();
            view.setSelected(true);
        }
    });
    listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
            final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
            View v =LayoutInflater.from(getContext()).inflate(R.layout.select_dialog_layout,null);
            builder.setView(v);
            builder.setTitle(give.get(position).gettitle()+"\n  "+give.get(position).getalbum());
            builder.create();
            final AlertDialog d=builder.show();

            //seting click listner.....
            TextView play = (TextView) v.findViewById(R.id.dialogplay);
            TextView playnext = (TextView) v.findViewById(R.id.dialogplaynext);
            TextView queue = (TextView) v.findViewById(R.id.dialogqueue);
            TextView fav = (TextView) v.findViewById(R.id.dialogaddtofav);
            TextView album = (TextView) v.findViewById(R.id.dialogalbum);
            TextView artist = (TextView) v.findViewById(R.id.dialogartist);
            TextView playlist = (TextView) v.findViewById(R.id.dialogaddtoplaylsit);
            TextView share = (TextView) v.findViewById(R.id.dialogshare);
            TextView delete = (TextView) v.findViewById(R.id.dialogdelete);
            TextView properties = (TextView) v.findViewById(R.id.dialogproperties);
            play.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    File f= new File(give.get(position).getSonguri().getLastPathSegment());
                    Log.d("LENGTH IS",""+f.length());
                    musicService.setplaylist(give,position);
                    musicService.setMediaPlayer();
                    d.dismiss();
                }
            });
            playnext.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    d.dismiss();

                }
            });
            queue.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    d.dismiss();
                    musicService.insertinqueue(give.get(position));
                }
            });

            fav.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    d.dismiss();
                    DataBaseClass db = new DataBaseClass(getContext());
                    int i=db.insetintoliked(give.get(position));
                    if(i==1)
                    {
                        Toast.makeText(getContext(),"Added to Favorites",Toast.LENGTH_SHORT).show();
                    }
                    else
                        Toast.makeText(getContext(),"Already in Favorites",Toast.LENGTH_SHORT).show();
                }
            });

            album.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    d.dismiss();
                    Intent i = new Intent( getActivity() , AlbumDetail.class);
                    Bundle b= new Bundle();
                    b.putCharSequence("album",give.get(position).getalbum());
                    i.putExtras(b);
                    startActivity(i);
                }
            });

            artist.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent i=new Intent(getActivity(),ArtistActivity.class);
                    i.putExtra("artist",give.get(position).getartist());
                    startActivity(i);
                    d.dismiss();

                }
            });
            playlist.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    d.dismiss();

                }
            });
            delete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    AlertDialog.Builder b = new AlertDialog.Builder(getContext());
                        b.setMessage("Audio '"+give.get(position).gettitle()+"' will be deleted permanently !");
                        b.setTitle("Delete ?");
                        b.setNegativeButton("No", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                d.dismiss();
                            }
                        });
                        b.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                            File f= new File(give.get(position).getSonguri().getPath());
                            boolean b = f.delete();
                            Log.d("Is file exist",f.exists()+"");
                            Log.d("File Lenth",""+f.length());
                            Log.d("Return value",""+b);
                            loader.set(getContext());
                            loader.deleteSong(getContext(),give.get(position).getPosition());
                            give.remove(position); // give is Arraylist of Songs(datatype);
                            listViewAdapter.notifyDataSetChanged();
                            if(b)
                            {
                                Toast.makeText(getContext(),"Deleted",Toast.LENGTH_SHORT).show();
                            }
                            else
                            {
                                Toast.makeText(getContext(),"Fail to Delete",Toast.LENGTH_SHORT).show();
                            }

                        }
                    });
                    b.create().show();
                    d.dismiss();

                }
            });
            share.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    d.dismiss();
                    Intent share = new Intent(Intent.ACTION_SEND);
                    share.setType("audio/*");
                    share.putExtra(Intent.EXTRA_STREAM, give.get(position).getSonguri());
                    startActivity(Intent.createChooser(share, "Share Audio"));
                }
            });
            properties.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    AlertDialog.Builder b = new AlertDialog.Builder(getContext());
                    File f= new File(give.get(position).getSonguri().getPath());
                    long size = (f.length())/1024;
                    long mb= size/1024;
                    long kb= size%1024;

                    b.setMessage("Size:"+"\n"+"Size "+mb+"."+kb+" MB\n"+"Path:"+f.getAbsolutePath()+"\n");
                    b.setTitle(f.getName());
                    b.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    });
                    b.create().show();
                    d.dismiss();
                }
            });

            return true;
        }
    });
    return v;
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);

    Log.d("fragment","instance saved");
}

@Override
public void onViewStateRestored(@Nullable Bundle savedInstanceState) {
    super.onViewStateRestored(savedInstanceState);
    Log.d("Fragment","Instance Restored");
}


public void intlistview()
{
    listViewAdapter = new ListViewAdapter(getContext(),give);
    listView.setAdapter(listViewAdapter);
}

@Override
public void onDestroy() {
    super.onDestroy();
    Log.d("Fragment","Destroyed");
    getActivity().unbindService(serviceConnection);
}

private ServiceConnection serviceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        MusicService.LocalBinder binder = (MusicService.LocalBinder) service;
        musicService  =  binder.getService();
        mBound =true;
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {
        mBound =false;
    }
};


public void allsongs()
{
    cursor = getContext().getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, columns, where, null, orderBy);
    dataindex = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);
    albumindex = cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM);
    titleindex = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);
    durationindex = cursor.getColumnIndex(MediaStore.Audio.Media.DURATION);
    artistindex = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);
    cursor.moveToFirst();
    for(int i=0;i<cursor.getCount();i++)
    {
        Songs song = new Songs();
        song.setalbum(cursor.getString(albumindex));
        song.settitle(cursor.getString(titleindex));
        song.setSonguri(Uri.parse(cursor.getString(dataindex)));
        song.setartist(cursor.getString(artistindex));
        song.setDuration(Long.decode(cursor.getString(durationindex)));
        song.setPosition(cursor.getPosition());
        this.give.add(song);
        cursor.moveToNext();
    }
    cursor.close();

}}

相册片段 

public class AlbumFragment extends Fragment {
songDetailloader songDetailloader  = new songDetailloader();
public AlbumFragment() {
    super();
}
GridView gridView;
AlbumAdapter a;
private static ArrayList<Bitmap> image = new ArrayList<>();
LinearLayout linearLayout;
Cursor cursor ;
ImageView album;

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

@Nullable
@Override


public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    final View v =inflater.inflate(R.layout.albumgridview,container,false);
    gridView = (GridView) v.findViewById(R.id.gridview);
    album = (ImageView) v.findViewById(R.id.albumart);
    /*Animation animation = AnimationUtils.loadAnimation(getContext(),R.anim.grid_layout_anim);
    GridLayoutAnimationController controller = new GridLayoutAnimationController(animation,0.2f,0.2f);
    gridView.setLayoutAnimation(controller);*/
    final TextView albumname = (TextView) v.findViewById(R.id.albumname);
    cursor = songDetailloader.getAlbumCursor(getContext());
    if(image.size()==0)
    new getbitmaps().execute();

    gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String s = songDetailloader.albumart(position);
            Intent i = new Intent( getActivity() , AlbumDetail.class);
            Bundle b= new Bundle();
            b.putCharSequence("album",songDetailloader.album(position));
            i.putExtras(b);
            startActivity(i);
        }
    });
    return v;
  }

public class getbitmaps extends AsyncTask<Void,Void,Void>
{
     Bitmap b;

    public getbitmaps() {
        super();
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

    }

    @Override
    protected Void doInBackground(Void... params) {
        for(int i=0;i<cursor.getCount();i++)
        {
            cursor.moveToPosition(i);
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize= 2;
            b=BitmapFactory.decodeFile(cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART)),options);
            if(b==null)
            {
                b=BitmapFactory.decodeFile(cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Albums.ALBUM_ART)));

            }
            image.add(b);
        }
        cursor.close();
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        a =new AlbumAdapter(getContext(),image);
        a.setCursor();
        gridView.setAdapter(a);
        new Thread(new Runnable() {
            @Override
            public void run() {
                songDetailloader.set(getContext());
            }
        }).start();

    }
}}

艺术家片段 

public class ArtistFragment extends Fragment {

ListView listView ;
ArrayList<Artists> aa = new ArrayList<>();
final String[] columns3 = {MediaStore.Audio.Artists._ID, MediaStore.Audio.Artists.ARTIST,MediaStore.Audio.Artists.NUMBER_OF_ALBUMS,MediaStore.Audio.Artists.NUMBER_OF_TRACKS};
final static String orderBy3 = MediaStore.Audio.Albums.ARTIST;
public Cursor cursor3;

public ArtistFragment() {
    super();
}

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

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

    listView  = (ListView) v.findViewById(R.id.listView);
    new artist().execute();
    return v;
}

public class artist extends AsyncTask<Void, Void ,Void>
{
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... params) {
        allartist();
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        ArtistAdapter artistAdapter = new ArtistAdapter(getActivity().getBaseContext(),aa);
        listView.setAdapter(artistAdapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent i= new Intent(getActivity(), ArtistActivity.class);
                i.putExtra("artist", aa.get(position).getArtistname());
                i.putExtra("noofsongs",aa.get(position).getNofosongs());
                startActivity(i);
            }
        });
    }
}

@Override
public void setInitialSavedState(SavedState state) {
    super.setInitialSavedState(state);
}

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

@Override
public void onDestroy() {
    super.onDestroy();
}

public void allartist()
{
    cursor3 = getContext().getContentResolver().query(MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI, columns3, null, null, orderBy3);
    cursor3.moveToFirst();
    for(int i=0;i< cursor3.getCount() ;i++)
    {
        Artists art = new Artists();
        art.setArtistname(cursor3.getString(cursor3.getColumnIndex(MediaStore.Audio.Artists.ARTIST)));
        art.setNoalbums(Integer.parseInt(cursor3.getString(cursor3.getColumnIndex(MediaStore.Audio.Artists.NUMBER_OF_ALBUMS))));
        art.setNofosongs(Integer.parseInt(cursor3.getString(cursor3.getColumnIndex(MediaStore.Audio.Artists.NUMBER_OF_TRACKS))));
        this.aa.add(art);
        cursor3.moveToNext();
    }
    cursor3.close();
}}

1 个答案:

答案 0 :(得分：0)

也许您可以尝试使用onCreate的{​​{1}}方法向viewpager添加此属性：

MainActivity

<强>更新

你可以尝试的另一件事是：

以这种方式覆盖viewPager.setOffscreenPageLimit(fragments.size()); 覆盖myfragment：

getItemPosition

并在@Override public int getItemPosition(Object object) { return POSITION_NONE; } 的{​​{1}}中添加此代码：

onCreate

此代码的目的不是高效，而是试图了解您的问题。 希望这可以帮到你

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