Question

在我的应用程序中有一个微调器，为用户提供选择单元，以便随机显示来自该特定单元的数据。我的微调器看起来像这样单元1 单元2 。。。单位-25 如果用户从微调器中选择单元-2，则单元-2中有12个单词，因此该单元中的单词应随机显示。我创建了一个表并存储在数据库中的列是单位，单词我已在表格中以下列方式存储

单元|字

1    bank
1    stack
1    over
1    flow
.     .
.     .
.     .
2    google
2    facebook
2    gmail

所以最多25个单位每个单位有12个单词。现在我应该检索它们并随机显示它们如果用户单击单元-12应该显示特定单位单词，如何为此编写逻辑。请帮助我解决此问题提前致谢

Answer 1

这是我用来从Sqlite填充数据的示例 Spinner，您可以根据需要对其进行自定义，移除SQLite 部分，如果你不需要它 - 而不是传递一个数组

在onActivityCreated中调用此方法

setDataForCity();

<强> FunctionDefinition ::

private void setDataForCity() {
    DatabaseHandler mHelper;
    SQLiteDatabase db = null;
    Cursor mCursor = null;

    ArrayList<LinkedHashMap<String,String>> listCollection=new ArrayList<LinkedHashMap<String,String>>();
    LinkedHashMap<String, String> mapCollection;
    try {

        mHelper = new DatabaseHandler(getActivity());
        db = mHelper.getReadableDatabase();

        //QUERY:- select city_id,city_name,no_of_buffets,downloaded from city_mas
        mCursor = db.rawQuery("select " 
                +""+city_mas.COLUMN_CITY_ID+"," 
                +""+city_mas.COLUMN_CITY_NAME+"," 
                +""+city_mas.COLUMN_DOWNLOADED+" " 
                +"from " 
                +""+city_mas.TABLE_NAME_CITY_MAS+"", null);

        if(mCursor.moveToFirst()){
            do{                 
                mapCollection=new  LinkedHashMap<String,String>();
                mapCollection.put(city_mas.COLUMN_CITY_ID, mCursor.getString(mCursor.getColumnIndexOrThrow(city_mas.COLUMN_CITY_ID)));
                mapCollection.put(city_mas.COLUMN_CITY_NAME, mCursor.getString(mCursor.getColumnIndexOrThrow(city_mas.COLUMN_CITY_NAME)));
                mapCollection.put(city_mas.COLUMN_DOWNLOADED, mCursor.getString(mCursor.getColumnIndexOrThrow(city_mas.COLUMN_DOWNLOADED)));
                listCollection.add(mapCollection);
            }while(mCursor.moveToNext());
        }

        AdpSearchCitySpinner adapter=new AdpSearchCitySpinner(getActivity(),listCollection);
        spnSearchByCity.setAdapter(adapter);

    } catch (Exception e) {
        e.printStackTrace();

    }finally{
        if(db!=null){
            if(db.isOpen()) db.close();
        }
        if(mCursor!=null){
            if(!mCursor.isClosed())mCursor.close();
        }
    }
}

<强> AdpSearchCitySpinner.java

public class AdpSearchCitySpinner extends BaseAdapter {

    Context mContext;
    ArrayList<LinkedHashMap<String, String>> city;

    public AdpSearchCitySpinner(Context context, ArrayList<LinkedHashMap<String, String>> _listCollection) {
        super();
        this.mContext = context;
        city=_listCollection;
    }

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

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

    @Override
    public long getItemId(int position) {
        return 0;
    }

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

        LinkedHashMap<String, String> mapCollection=city.get(position);

        LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
        View row = inflater.inflate(R.layout.adp_search_city_spinner, parent, false);

        TextView city_id = (TextView) row.findViewById(R.id.city_id);
        TextView city_name = (TextView) row.findViewById(R.id.city_name);
        TextView downloaded_id = (TextView) row.findViewById(R.id.downloaded_id);

        city_id.setText(mapCollection.get(city_mas.COLUMN_CITY_ID));       
        city_name.setText(mapCollection.get(city_mas.COLUMN_CITY_NAME));
        downloaded_id.setText(mapCollection.get(city_mas.COLUMN_DOWNLOADED));

        return row;
    }   
}

希望这有帮助！

如何在android中从数据库加载数据到微调器

单元|字

1 个答案: