与数据库和自定义适配器的可扩展列表视图

Question

我想使用其内容从数据库填充的可扩展列表视图。

我写的代码，但我没有得到正确的输出。它为所有父母提供所有记录，但是我想为一位父母显示仅显示相关的孩子以及根据其各自父母显示的其他孩子。 这是给我的输出，如：

• 日期1

  • 数据1
  • 数据2

• date2的

  • 数据1
  • DATA2

这就是问题所在。我想输出如下

• 日期1
  • 数据1
• date2的
  • 数据2

//下面是活动类

public class FavoriteActivity extends Activity { 

/** Final static constant. */ 
private static final String TAG = "FAVORITE_ACTIVITY"; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_favorite); 

    Cursor mCursor = null; 
    Cursor mDataCursor = null; 
    FavoriteNews mFavoriteNews = null; 
    List<String> mList; 
    List<FavoriteNews> mFavoriteList = new ArrayList<FavoriteNews>(); 
    mCursor = DBHandler.getData("select DISTINCT " + DBHelper.NEWS_DATE + " from " + DBHelper.FAVOURITE_TABLE + "", 
      null); 

    if (mCursor.getCount() != 0) { 
     mList = new ArrayList<String>(); 
     while (mCursor.moveToNext()) { 
      mList = new ArrayList<String>(); 
      mDataCursor = DBHandler.getData("select " + DBHelper.NEWS_LABEL + " from " + DBHelper.FAVOURITE_TABLE 
        + " where " + DBHelper.NEWS_DATE + "='" + mCursor.getString(0) + "'", null); 
      if (mDataCursor.getCount() != 0) { 
       while (mDataCursor.moveToNext()) { 
        mFavoriteNews = new FavoriteNews(); 
        String news = mDataCursor.getString(0); 
        mList.add(news); 
       } 
       mDataCursor.close(); 
       String date = mCursor.getString(0); 
       mFavoriteNews.setDate(date); 
       mFavoriteNews.setFavNews(mList); 
      } 
      mFavoriteList.add(mFavoriteNews); 
     } 
     try { 
      ExpandableListView mExList = (ExpandableListView) findViewById(R.id.expandable_list); 
      mExList.setAdapter(new CustomExpandableAdapter(this, mFavoriteList)); 

      mCursor.close(); 
     } catch (Exception e) { 
      Log.e(TAG, "Data not found", e); 
     } finally { 
      if (mDataCursor != null) { 
       mDataCursor.close(); 
      } 
      if (mCursor != null) { 
       mCursor.close(); 
      } 
     } 
    } else { 
     Toast.makeText(this, "No Favorite Items are Available", Toast.LENGTH_SHORT).show(); 
    } 
} 

}

//这是我的另一个类

public class FavoriteNews { 
    String date; 
    List<String> favNews; 

    public String getDate() { 
     return date; 
    } 
    public void setDate(String date) { 
     this.date = date; 
    } 
    public List<String> getFavNews() { 
     return favNews; 
    } 
    public void setFavNews(List<String> favNews) { 
     this.favNews = favNews; 
    } 
} 

//这是适配器

public class CustomExToDoAdapter extends BaseExpandableListAdapter{ 

    LayoutInflater inflater; 
    ArrayList<ToDoTaskList> list; 

    public CustomExToDoAdapter(Context context,ArrayList<ToDoTaskList> list){ 
     inflater=LayoutInflater.from(context); 
     this.list=list; 
    } 


    @Override 
    public Object getChild(int groupPosition, int childPosition) { 
     return list.get(groupPosition).getTaskList().get(childPosition); 
    } 

    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
     return childPosition; 
    } 

    @Override 
    public View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) { 
     if(convertView==null){ 
      convertView=inflater.inflate(R.layout.child_row, parent,false); 
     } 
     TextView childTxt=(TextView) convertView.findViewById(R.id.childItem); 
     childTxt.setText(list.get(groupPosition).getTaskList().get(childPosition)); 
     childTxt.setPadding(40, 5, 5, 5); 
     return convertView; 
    } 

    @Override 
    public int getChildrenCount(int groupPosition) { 
     return list.get(groupPosition).getTaskList().size(); 
    } 

    @Override 
    public Object getGroup(int groupPosition) { 
     return list.get(groupPosition).getDate(); 
    } 

    @Override 
    public int getGroupCount() { 
     return list.size(); 
    } 

    @Override 
    public long getGroupId(int groupPosition) { 
     return groupPosition; 
    } 

    @Override 
    public View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) { 
     if(convertView==null){ 
      convertView=inflater.inflate(R.layout.header_row, parent,false); 
     } 
     TextView txtView=(TextView) convertView.findViewById(R.id.header); 
     txtView.setText(getGroup(groupPosition).toString()); 
     txtView.setPadding(50, 10, 10, 10); 
     return convertView; 
    } 

    @Override 
    public boolean hasStableIds() { 
     return true; 
    } 

    @Override 
    public boolean isChildSelectable(int groupPosition, int childPosition) { 
     return true; 
    } 
    public void registerDataSetObserver(DataSetObserver observer) 
    { 

      /* used to make the notifyDataSetChanged() method work */ 
      super.registerDataSetObserver(observer); 
      //Log.i("TAG","Inside Cons 10"); 
     } 
} 

Answer 1

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

       dbHelper=new DBHelper(this, "smartdiary.db", null, 2); 
       SQLiteDatabase db=dbHelper.getWritableDatabase(); 
       dbHandler=new DBHandler(this,db); 
       favoriteList=new ArrayList<FavoriteNews>(); 
       Cursor cursor=dbHandler.getData("select DISTINCT date from favorite", null); 

       mExList=(ExpandableListView) findViewById(R.id.expandable_list); 

       if(cursor.getCount()!=0) 
       { 

        while(cursor.moveToNext()) 
        { 

//create a list each time data found so that it contains only relevant data with //corresponding group 
         list=new ArrayList<String>(); 
         Cursor dataCursor=dbHandler.getData("select newsLabel from favorite where date='"+cursor.getString(0)+"'",null); 
         if(dataCursor.getCount()!=0) 
         { 
          System.out.println(" Value of Cursor "+cursor.getCount()); 
          System.out.println("Value of dataCursor "+dataCursor.getCount()); 
          while(dataCursor.moveToNext()){    
           favoriteNews=new FavoriteNews(); 
           String news=dataCursor.getString(0); 

           list.add(news); 
          } 
          String date=cursor.getString(0); 
          favoriteNews.setDate(date); 
          favoriteNews.setFavNews(list); 
         } 
     favoriteList.add(favoriteNews); 
        } 
     try{ 
        mExList.setAdapter(new CustomExpandableAdapter(this, favoriteList)); 
        } 
        catch(Exception e) 
        { 

         e.printStackTrace(); 
        } 
       } 

       else{ 
        Log.i("FAV_CURSOR", "Data not Found"); 
        Toast.makeText(this, "No Favorite Items are Availble", Toast.LENGTH_SHORT).show(); 
       } 

      }