ListView zweimal in der Fragmentklasse einstellen

Question

Ich habe eine Basistabelle in der Datenbank namens "Category". Dann haben zwei andere Tabellen namens Category1 und Category2 beide eine Eins-zu-viele-Beziehung mit der Kategorie-Tabelle. Es ist wie folgt: -

**Category Table** 
Id Category 
0  Category1 (One) -> Category1 Table (Many). 
1  Category2 (One) -> Category2 Table (Many). 

ich einen Tab-Manager bin mit dem die beiden Kategorien aus der Kategorie-Tabelle und die Liste der Elemente in einer Listenansicht in einem Register von category1 oder category2 Tabelle und die andere zeigt in die andere Registerkarte. Aber das Problem, das ich gegenüberstelle, ist, dass ich versuche, den Adapter auf listview basierend auf einer if-else-Anweisung zu setzen. Es zeigt also nur Kategorie1-Elemente und nicht Kategorie2-Elemente, wenn ich auf der Registerkarte Kategorie2 drücke. Ich weiß, dass ich zwei Adapter in einer einzigen Listenansicht basierend auf den Recherchen, die ich getan habe, nicht einstellen kann. Gibt es eine Lösung? Unten ist mein Code.

FragmentClass

public class CategoryFragment extends Fragment{ 

    private ListView listView; 
    private String currentTabTag; 
    private CategoryAdapter1 categoryAdapter1; 
    private CategoryAdapter2 categoryAdapter2; 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // inflate the layout for this fragment 
     View view = inflater.inflate(R.layout.activity_category_fragment_list, container, false); 

     // get references to widgets 
     listView = (ListView) view.findViewById (R.id.prescriptorsListView); 

     // get the current tab 
     TabHost tabHost = (TabHost) container.getParent().getParent(); 
     currentTabTag = tabHost.getCurrentTabTag(); 

     // refresh the category list view 
     refreshCategoryList(); 

     // return the view 
     return view; 
    } 

    public void refreshCategoryList() { 
     // get category list for current tab from database 
     Context context = getActivity().getApplicationContext(); 
     CategoryDatabase categoryDatabase = new CategoryDatabase(context); 

     if(currentTabTag.equals("Category 1")) { 
      ArrayList<Category1> category1ArrayList = categoryDatabase.getAllCategory1(currentTabTag); 
      // create adapter and set it in the ListView widget 
      listView = new Category1Adapter(context, category1ArrayList); 
      listView.setAdapter(Category1Adapter); 
     } 
     else if(currentTabTag.equals("Category 2")) 
     { 
      ArrayList<Category2> category2ArrayList = categoryDatabase.getAllCategory2(currentTabTag); 
      // create adapter and set it in the ListView widget 
      listView = new Category2dapter(context, category2ArrayList); 
      listView.setAdapter(Category2Adapter); 
     } 

    } 
    @Override 
    public void onResume() { 
     super.onResume(); 
     refreshTaskList(); 
    } 
} 

Adapter von Category1

public class Category1Adapter extends BaseAdapter { 
    private Context context; 
    private ArrayList<Category1> category1ArrayList; 

    public Category1Adapter(Context context, ArrayList<FamilyPrescription> category1ArrayList) { 
     this.context = context; 
     this.category1ArrayList = category1ArrayList; 
    } 

    @Override 
    public int getCount() { 
     return category1ArrayList.size(); 
    } 

    @Override 
    public Object getItem(int position) { 
     return category1ArrayList.get(position); 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     Category1TaskLayout taskLayout = null; 
     Category1 category1 = category1ArrayList.get(position); 

     if (convertView == null) { 
      taskLayout = new Category1TaskLayout(context, category1); 
     } else { 
      taskLayout = (Category1TaskLayout) convertView; 
      taskLayout.setCategory1(category1); 
     } 
     return taskLayout; 
    } 
} 

Der Adapter von category2 ist, auf die oben Adapter ähnlich.

Jede Hilfe würde geschätzt :)

Answer 1

Als ich vorschlagen, dachte ich über einen Adapter verwenden.

private class OneAdapter extends BaseAdapter { 

    List<Category1> cat1 = categoryDatabase.getAllCategory1(currentTabTag); 
    List<Category2> cat2 = categoryDatabase.getAllCategory2(currentTabTag); 

    @Override 
    public int getCount() { 
     if(currentTabTag.equals("Category 1")) { 
      return cat1.size(); 
     } else if(currentTabTag.equals("Category 2")) { 
      return cat2.size(); 
     } 
     return 0; 
    } 

    @Override 
    public Object getItem(int position) { 
     if(currentTabTag.equals("Category 1")) { 
      return cat1.get(position); 
     } else if(currentTabTag.equals("Category 2")) { 
      return cat2.get(position); 
     } 
     return null; 
    } 

    @Override 
    public long getItemId(int position) { 
     return position; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     //... 

     Object c = getItem(position); 
     if(c instanceof Category1) { 
      ... 
     } else if(c instanceof Category2) { 
      ... 
     } 

     return convertView; 
    } 
} 

Als Tab geändert müssen Adapter aktualisieren;

tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() { 
     @Override 
     public void onTabChanged(String tabId) { 
      currentTabTag = tabHost.getCurrentTabTag(); 
      adapter.notifyDataSetChanged(); 
     } 
    }); 

Vollarbeitsbeispiel in Aktivität:

import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ListView; 
import android.widget.TabHost; 
import android.widget.TextView; 

import java.util.ArrayList; 
import java.util.List; 

public class Main2Activity extends AppCompatActivity { 

    TabHost tabHost; 
    ListView listView; 
    String currentTabTag; 
    CategoryDatabase categoryDatabase; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main2); 

     tabHost = (TabHost) findViewById(android.R.id.tabhost); 
     tabHost.setup(); 
     TabHost.TabSpec tab1 = tabHost.newTabSpec("Category 1"); 
     TabHost.TabSpec tab2 = tabHost.newTabSpec("Category 2"); 
     tab1.setContent(R.id.tab1); 
     tab1.setIndicator("Cat1"); 
     tab2.setContent(R.id.tab2); 
     tab2.setIndicator("Cat2"); 
     tabHost.addTab(tab1); 
     tabHost.addTab(tab2); 

     categoryDatabase = new CategoryDatabase(); 

     currentTabTag = tabHost.getCurrentTabTag(); 

     listView = (ListView) findViewById(android.R.id.list); 

     listView.setAdapter(new TabAdapter()); 
     tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() { 
      @Override 
      public void onTabChanged(String tabId) { 
       currentTabTag = tabHost.getCurrentTabTag(); 
       ((BaseAdapter)listView.getAdapter()).notifyDataSetChanged(); 
      } 
     }); 
    } 

    private class TabAdapter extends BaseAdapter { 

     @Override 
     public int getCount() { 
      if(currentTabTag.equals("Category 1")) { 
       return categoryDatabase.getAllCategory1().size(); 
      } else if(currentTabTag.equals("Category 2")) { 
       return categoryDatabase.getAllCategory2().size(); 
      } 
      return 0; 
     } 

     @Override 
     public Object getItem(int position) { 
      if(currentTabTag.equals("Category 1")) { 
       return categoryDatabase.getAllCategory1().get(position); 
      } else if(currentTabTag.equals("Category 2")) { 
       return categoryDatabase.getAllCategory2().get(position); 
      } 
      return null; 
     } 

     @Override 
     public long getItemId(int position) { 
      return position; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      final ViewHolder holder; 
      if(convertView == null) { 
       convertView = LayoutInflater.from(Main2Activity.this).inflate(android.R.layout.simple_list_item_1, parent, false); 
       holder = new ViewHolder(convertView); 
       convertView.setTag(holder); 
      } else { 
       holder = (ViewHolder) convertView.getTag(); 
      } 

      Object c = getItem(position); 
      if(c instanceof Category1) { 
       Category1 c1 = (Category1) c; 
       holder.text1.setText(c1.text); 
      } else if(c instanceof Category2) { 
       Category2 c2 = (Category2) c; 
       holder.text1.setText(c2.text); 
      } 

      return convertView; 
     } 

     class ViewHolder { 
      TextView text1; 
      public ViewHolder(View convertView) { 
       text1 = (TextView) convertView.findViewById(android.R.id.text1); 
      } 
     } 
    } 
} 

class CategoryDatabase { 
    private List<Category1> cat1; 
    private List<Category2> cat2; 
    { 
     cat1 = new ArrayList<Category1>(); 
     cat2 = new ArrayList<Category2>(); 
     for(int i=0;i<10;i++) { 
      cat1.add(new Category1("Category 1 "+i)); 
     } 
     for(int i=0;i<20;i++) { 
      cat2.add(new Category2("Category 2 "+i)); 
     } 
    } 

    public List<Category1> getAllCategory1() { 
     return cat1; 
    } 
    public List<Category2> getAllCategory2() { 
     return cat2; 
    } 
} 

class Category1 { 
    String text; 
    public Category1(String text) { 
     this.text = text; 
    } 
} 

class Category2 { 
    String text; 
    public Category2(String text) { 
     this.text = text; 
    } 
} 

Layout:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <TabHost 
     android:id="@android:id/tabhost" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:padding="5dp"> 

      <TabWidget 
       android:id="@android:id/tabs" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" /> 

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

       <View 
        android:id="@+id/tab1" 
        android:layout_width="match_parent" 
        android:layout_height="0dp" /> 

       <View 
        android:id="@+id/tab2" 
        android:layout_width="match_parent" 
        android:layout_height="0dp"></View> 
      </FrameLayout> 
     </LinearLayout> 

    </TabHost> 

    <ListView 
     android:id="@android:id/list" 
     android:layout_width="match_parent" 
     android:layout_weight="1" 
     android:layout_height="0dp" /> 
</LinearLayout> 

Answer 2

So nach Tonnen Forschung, ich habe endlich meine Reiter arbeiten. Ich habe den CWAC Merge Adapter verwendet, der in dieser github link für Interessierte gefunden werden kann.

Hier ist, wie ich in meinem Code verwendet:

Fragment Klasse

public class CategoryFragment extends Fragment{ 

    private ListView listView; 
    private String currentTabTag; 
    private CategoryAdapter1 categoryAdapter1; 
    private CategoryAdapter2 categoryAdapter2; 
    private MergeAdapter adapter = new MergeAdapter(); 
    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     // inflate the layout for this fragment 
     View view = inflater.inflate(R.layout.activity_category_fragment_list, container, false); 

     // get references to widgets 
     listView = (ListView) view.findViewById (R.id.prescriptorsListView); 

     // get the current tab 
     TabHost tabHost = (TabHost) container.getParent().getParent(); 
     currentTabTag = tabHost.getCurrentTabTag(); 

     // refresh the category list view 
     refreshCategoryList(); 

     // return the view 
     return view; 
    } 

    public void refreshCategoryList() { 
     // get category list for current tab from database 
     Context context = getActivity().getApplicationContext(); 
     CategoryDatabase categoryDatabase = new CategoryDatabase(context); 

     if(currentTabTag.equals("Category 1")) { 
      ArrayList<Category1> category1ArrayList = categoryDatabase.getAllCategory1(currentTabTag); 
      // create adapter and set it in the ListView widget 
      categoryAdapter1 = new Category1Adapter(context, category1ArrayList); 
      adapter.add(Category1Adapter); 
     } 
     else if(currentTabTag.equals("Category 2")) 
     { 
      ArrayList<Category2> category2ArrayList = categoryDatabase.getAllCategory2(currentTabTag); 
      // create adapter and set it in the ListView widget 
      categoryAdapter2 = new categoryAdapter2(context, category2ArrayList); 
      adapter.add(categoryAdapter2); 
     } 
     listView.setAdapter(adapter); 

    } 
    @Override 
    public void onResume() { 
     super.onResume(); 
     refreshTaskList(); 
    } 
} 

Ich habe diesen Code getestet und es funktioniert.

Wenn jemand eine bessere Möglichkeit hat, dies zu kodieren, bitte teilen.

Glücklich Coding :)