fragmentAdapterを使用してさまざまな状況で異なるフラグメントを受け取る方法

私はビューページャーを実装しようとしているアクティビティを持っています。問題は、それぞれの状況が異なる量のフラグメントと画面を表示できるという事実にあります。fragmentAdapterを使用してさまざまな状況で異なるフラグメントを受け取る方法

私の現在のプロジェクトでは、オブジェクトは4つのデータ項目を含むことができ、それぞれ異なるフラグメントに対応します。

例えば2は、スワイプが欠落している間に、たとえば私は、データ項目1,3と4を持っている場合は1から3までに行く必要が、その後4と後方スワイプは4,3,1

に行く必要があるので、私私はどれくらいの数を持っているかを確認するためにgetCountメソッドを書いています。マップを使ってリストを調べ、それらが正しくマップされていることを確認します。しかし、アプリケーション自体は間違いを犯し、必要なものとは異なる断片を示しています。私は何が不足しているのだろうと、よりよいアプローチがあるのだろうか？

public DemoFragmentAdapter(FragmentManager fm, MYObject currentObject) { 
     super(fm); 
     set_currentObject(currentObject); 
     createItemConvertionMap(); 
    } 

@Override 
    public int getCount() { 
     int count=0; 
     if (_currentObject.get_type1()!=null&&_currentObject.get_type1().isEmpty()==false) 
     { 
      count++; 
     } 
     if (_currentObject.get_type2()!=null&& 
       _currentObject.get_type2().isEmpty()==false) 
     { 
      count++; 
     } 
     if (_currentObject.get_type3()!=null&& 
       _currentObject.get_type3().isEmpty()==false) 
     { 
      count++; 
     } 
     if (_currentObject.get_type4()!=null&&_currentObject.get_type4().isEmpty()==false) 
     { 
      count++; 
     } 
     Log.d(MyApplication.LOG_TAG,"fragment adaprter - count:\n"+count); 

     return count; 
    } 

public void createItemConvertionMap() { 
     _convertionMap=new HashMap<>(); 
     int i=0; 
     if (_currentObject.get_type1()!=null&&_currentObject.get_type1().isEmpty()==false) 
     { 
      _convertionMap.put(i, TYPE1); 
      i++; 
     } 
     if (_currentObject.get_type2()!=null&& 
       _currentObject.get_type2().isEmpty()==false) 
     { 
      _convertionMap.put(i, TYPE2); 
      i++; 
     } 
     if (_currentObject.get_type3()!=null&& 
       _currentObject.get_type3().isEmpty()==false) 
     { 
      _convertionMap.put(i, TYPE3); 
      i++; 
     } 
     if (_currentObject.get_type4()!=null&&_currentObject.get_type4().isEmpty()==false) 
     { 
      _convertionMap.put(i, TYPE4); 
      i++; 
     } 
    } 

@Override 
    public Fragment getItem(int i) { 
     Fragment fragment=new FragmentType1();//default 
     Bundle args = new Bundle(); 
     int fragmentItem=get_convertionMap().get(i); 
     Log.d(MyApplication.LOG_TAG,"fragment adaprter - item key requested:"+i +" item convertion is:"+fragmentItem); 
     switch (fragmentItem) { 
     case TYPE1: 
      Log.d(MyApplication.LOG_TAG,"fragment adaprter - returning TYPE1 fragment"); 
      fragment=new FragmenType1(); 
      break; 
     case TYPE2: 
      Log.d(MyApplication.LOG_TAG,"fragment adaprter - returning TYPE2fragment"); 
      fragment=new FragmentType2(); 
      break; 
     case TYPE3: 
      Log.d(MyApplication.LOG_TAG,"fragment adaprter - returning TYPE3 fragment"); 
      fragment=new FragmentType3(); 
      break; 

     case TYPE4: 
      Log.d(MyApplication.LOG_TAG,"fragment adaprter - returning TYPE 4 fragment"); 
      fragment=new FragmentType4(); 
      break; 
     default: 
      Log.d(MyApplication.LOG_TAG,"fragment adaprter - an error with returend converted item returning default fragment"); 
      break; 
     } 
     // TODO finish object bundle 
     args.putInt(MyActivity.ARG_OBJECT, i + 1); 
     fragment.setArguments(args); 
     return fragment; 
    }

ログ起動第1の目的は、微細示した後に、それは2つのデータ項目を有し、作業の両方apaer correctlly第1ありえないが良く、それは3つのデータ項目を有するがパガーがそれらを通過するとき、それはTYPE1、TYPE4になり、TYPE4の代わりにTYPE1、TYPE2、TYPE4：

03-17 15:05:16.482: D/GABI(955): fragment adaprter - count: 
03-17 15:05:16.482: D/GABI(955): 2 
03-17 15:05:16.492: D/GABI(955): fragment adaprter - count: 
03-17 15:05:16.492: D/GABI(955): 2 
03-17 15:05:16.494: D/GABI(955): fragment adaprter - item key requested:0 item convertion is:0 
03-17 15:05:16.494: D/GABI(955): fragment adaprter - returning TYPE1 fragment 
03-17 15:05:16.494: D/GABI(955): fragment adaprter - item key requested:1 item convertion is:3 
03-17 15:05:16.494: D/GABI(955): fragment adaprter - returning TYPE4 fragment 
03-17 15:05:16.494: D/GABI(955): fragment adaprter - count: 
03-17 15:05:16.494: D/GABI(955): 2 
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03-17 15:05:45.682: D/GABI(955): 2 
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03-17 15:05:45.699: D/GABI(955): 2 
03-17 15:05:45.716: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.716: D/GABI(955): 2 
03-17 15:05:45.732: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.732: D/GABI(955): 2 
03-17 15:05:45.749: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.749: D/GABI(955): 2 
03-17 15:05:45.766: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.766: D/GABI(955): 2 
03-17 15:05:45.783: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.783: D/GABI(955): 2 
03-17 15:05:45.799: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.799: D/GABI(955): 2 
03-17 15:05:45.816: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.816: D/GABI(955): 2 
03-17 15:05:45.833: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.833: D/GABI(955): 2 
03-17 15:05:45.850: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.850: D/GABI(955): 2 
03-17 15:05:45.867: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.867: D/GABI(955): 2 
03-17 15:05:45.883: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.883: D/GABI(955): 2 
03-17 15:05:45.899: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.899: D/GABI(955): 2 
03-17 15:05:45.916: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.916: D/GABI(955): 2 
03-17 15:05:45.933: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.933: D/GABI(955): 2 
03-17 15:05:45.949: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.949: D/GABI(955): 2 
03-17 15:05:45.966: D/GABI(955): fragment adaprter - count: 
03-17 15:05:45.966: D/GABI(955): 2 
03-17 15:05:51.150: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.150: D/GABI(955): 2 
03-17 15:05:51.150: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.150: D/GABI(955): 2 
03-17 15:05:51.150: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.150: D/GABI(955): 2 
03-17 15:05:51.150: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.150: D/GABI(955): 2 
03-17 15:05:51.165: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.165: D/GABI(955): 3 
03-17 15:05:51.170: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.170: D/GABI(955): 3 
03-17 15:05:51.170: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.170: D/GABI(955): 3 
03-17 15:05:51.186: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.186: D/GABI(955): 3 
03-17 15:05:51.186: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.186: D/GABI(955): 3 
03-17 15:05:51.258: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.258: D/GABI(955): 3 
03-17 15:05:51.272: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.272: D/GABI(955): 3 
03-17 15:05:51.272: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.272: D/GABI(955): 3 
03-17 15:05:51.273: D/GABI(955): fragment adaprter - count: 
03-17 15:05:51.273: D/GABI(955): 3 
03-17 15:05:52.996: D/GABI(955): fragment adaprter - count: 
03-17 15:05:52.996: D/GABI(955): 3 
03-17 15:05:52.996: D/GABI(955): fragment adaprter - count: 
03-17 15:05:52.996: D/GABI(955): 3 
03-17 15:05:52.996: D/GABI(955): fragment adaprter - count: 
03-17 15:05:52.996: D/GABI(955): 3 
03-17 15:05:53.017: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.017: D/GABI(955): 3 
03-17 15:05:53.034: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.034: D/GABI(955): 3 
03-17 15:05:53.051: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.051: D/GABI(955): 3 
03-17 15:05:53.051: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.051: D/GABI(955): 3 
03-17 15:05:53.053: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.053: D/GABI(955): 3 
03-17 15:05:53.067: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.067: D/GABI(955): 3 
03-17 15:05:53.067: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.067: D/GABI(955): 3 
03-17 15:05:53.069: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.069: D/GABI(955): 3 
03-17 15:05:53.084: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.084: D/GABI(955): 3 
03-17 15:05:53.084: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.084: D/GABI(955): 3 
03-17 15:05:53.086: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.086: D/GABI(955): 3 
03-17 15:05:53.100: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.100: D/GABI(955): 3 
03-17 15:05:53.100: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.100: D/GABI(955): 3 
03-17 15:05:53.101: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.101: D/GABI(955): 3 
03-17 15:05:53.106: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.106: D/GABI(955): 3 
03-17 15:05:53.106: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.106: D/GABI(955): 3 
03-17 15:05:53.106: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.106: D/GABI(955): 3 
03-17 15:05:53.117: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.117: D/GABI(955): 3 
03-17 15:05:53.134: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.134: D/GABI(955): 3 
03-17 15:05:53.151: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.151: D/GABI(955): 3 
03-17 15:05:53.168: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.168: D/GABI(955): 3 
03-17 15:05:53.184: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.184: D/GABI(955): 3 
03-17 15:05:53.201: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.201: D/GABI(955): 3 
03-17 15:05:53.218: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.218: D/GABI(955): 3 
03-17 15:05:53.234: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.234: D/GABI(955): 3 
03-17 15:05:53.251: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.251: D/GABI(955): 3 
03-17 15:05:53.268: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.268: D/GABI(955): 3 
03-17 15:05:53.284: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.284: D/GABI(955): 3 
03-17 15:05:53.301: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.301: D/GABI(955): 3 
03-17 15:05:53.318: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.318: D/GABI(955): 3 
03-17 15:05:53.335: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.335: D/GABI(955): 3 
03-17 15:05:53.351: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.351: D/GABI(955): 3 
03-17 15:05:53.368: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.368: D/GABI(955): 3 
03-17 15:05:53.385: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.385: D/GABI(955): 3 
03-17 15:05:53.401: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.401: D/GABI(955): 3 
03-17 15:05:53.418: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.418: D/GABI(955): 3 
03-17 15:05:53.435: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.435: D/GABI(955): 3 
03-17 15:05:53.452: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.452: D/GABI(955): 3 
03-17 15:05:53.468: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.468: D/GABI(955): 3 
03-17 15:05:53.485: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.485: D/GABI(955): 3 
03-17 15:05:53.485: D/GABI(955): fragment adaprter - item key requested:2 item convertion is:3 
03-17 15:05:53.485: D/GABI(955): fragment adaprter - returning TYPE4 fragment 
03-17 15:05:53.485: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.485: D/GABI(955): 3 
03-17 15:05:53.490: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.490: D/GABI(955): 3 
03-17 15:05:53.490: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.490: D/GABI(955): 3 
03-17 15:05:53.491: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.491: D/GABI(955): 3 
03-17 15:05:53.976: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.976: D/GABI(955): 3 
03-17 15:05:53.976: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.976: D/GABI(955): 3 
03-17 15:05:53.976: D/GABI(955): fragment adaprter - count: 
03-17 15:05:53.976: D/GABI(955): 3 
03-17 15:05:54.003: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.003: D/GABI(955): 3 
03-17 15:05:54.019: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.019: D/GABI(955): 3 
03-17 15:05:54.020: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.020: D/GABI(955): 3 
03-17 15:05:54.022: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.022: D/GABI(955): 3 
03-17 15:05:54.036: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.036: D/GABI(955): 3 
03-17 15:05:54.036: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.036: D/GABI(955): 3 
03-17 15:05:54.038: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.038: D/GABI(955): 3 
03-17 15:05:54.053: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.053: D/GABI(955): 3 
03-17 15:05:54.053: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.053: D/GABI(955): 3 
03-17 15:05:54.054: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.054: D/GABI(955): 3 
03-17 15:05:54.069: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.069: D/GABI(955): 3 
03-17 15:05:54.069: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.069: D/GABI(955): 3 
03-17 15:05:54.070: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.070: D/GABI(955): 3 
03-17 15:05:54.075: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.075: D/GABI(955): 3 
03-17 15:05:54.075: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.075: D/GABI(955): 3 
03-17 15:05:54.075: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.075: D/GABI(955): 3 
03-17 15:05:54.086: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.086: D/GABI(955): 3 
03-17 15:05:54.103: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.103: D/GABI(955): 3 
03-17 15:05:54.120: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.120: D/GABI(955): 3 
03-17 15:05:54.136: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.136: D/GABI(955): 3 
03-17 15:05:54.153: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.153: D/GABI(955): 3 
03-17 15:05:54.170: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.170: D/GABI(955): 3 
03-17 15:05:54.187: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.187: D/GABI(955): 3 
03-17 15:05:54.203: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.203: D/GABI(955): 3 
03-17 15:05:54.220: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.220: D/GABI(955): 3 
03-17 15:05:54.237: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.237: D/GABI(955): 3 
03-17 15:05:54.254: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.254: D/GABI(955): 3 
03-17 15:05:54.270: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.270: D/GABI(955): 3 
03-17 15:05:54.287: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.287: D/GABI(955): 3 
03-17 15:05:54.303: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.303: D/GABI(955): 3 
03-17 15:05:54.321: D/GABI(955): fragment adaprter - count: 
03-17 15:05:54.321: D/GABI(955): 3

出典

2017-03-17 Gabriel H

なぜあなたのオブジェクトに4種類ありますか？現在、あなたのオブジェクトは同時に4つのタイプになることができます。それは本当に混乱しています。 – beeb

実際には4つのタイプではなく、私は実際のコンテンツを入れ替えました。基本的にオブジェクトにはそれぞれ異なるフラグメントに対応する4つのデータ項目を含めることができます。たとえば、データアイテム1,3と4がある場合2が欠落しています。スワイプが1から3に移動する必要があり、4と後方スワイプが4,3,1に移動する必要があります。 –

あなたの正確な問題について、断片。どの断片がロードされ、何を期待していますか。デバッグのコンソール出力を追加してください。私たちはそれの値を見ることができるあなたのオブジェクトをトレースすることはできますか？アダプタが1つのフラグメントだけをロードすると思う場合は、間違っていることに注意してください。デフォルトのオフスクリーンページは1で、低くすることはできません。 – beeb

私はあなたの問題が何であるか知っていると思います。 viewpagesのoffscreenpageのデフォルトと最小値は1であるので、最初のフラグメントはタイプ1です。2番目のフラグメントはタイプ4です。オブジェクトが更新され、タイプ2が追加されます。しかし、フラグメント1（タイプ1）とタイプ2（タイプ4）は既にロードされており、ビューページャのキャッシュにあります。

更新前のマップ：

インデックス0 = 1型

指数1 = 4型

更新後のマップ：

インデックス0 =タイプ1

インデックス1 =タイプ2 < - この1つはあなたが現在お使いの画面で見る何新しい

インデックス2 =タイプ4

次のとおりです。 - この1

インデックス0 =タイプ1

インデックス1 =タイプ4 <更新されない（それがあるべき2）

インデックス2 =タイプ4

しかし、新しいトンype（タイプ2）は既にロードされてインデックス1にキャッシュされているため、更新されません。アダプターはタイプ2のインデックス2のフラグメントを正しく作成します。

出典

2017-03-17 14:07:15 beeb

私はviewpagerを含むアクティビティ全体に対してrecreate（）メソッドを使用します。そのシナリオをカバーしてはいけないのでしょうか？ –

あなたは正しいと思います。再作成する前に、次の行をメソッドに追加しました。 - viewPager.setAdapter（null）;アダプターをクリアしてから、アクティビティーのoncreateviewメソッドで再作成します。私は全体の活動を再開したが、結果と主張することはできません：/ ty –

fragmentAdapterを使用してさまざまな状況で異なるフラグメントを受け取る方法

答えて

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