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我想使用从数据库中填充内容的可扩展列表视图。

我写了代码，但我没有得到正确的输出。它提供了所有父母的所有记录，但我想显示一个父母只显示相关的孩子，而其他孩子则根据他们各自的父母显示。它给了我这样的输出：

  • 日期1

    • 数据1
    • 数据2

  • 日期2

    • 数据1
    • 数据2

这就是问题。我想要输出如下

  • 日期1
    • 数据1
  • 日期2
    • 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();
    }
}

}

//这是我的另一堂课

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;
    }
}

// 这是适配器的代码

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");
        }
}
4

1 回答 1

0 
        @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();
                }

            }
于 2013-05-02T06:22:59.410 回答