Android简单光标适配器

Question

您好我的列表视图使用光标适配器，我的问题是当我把我的应用程序在后台，在重新调整我的屏幕是空的，在onresume我打开数据库并创建光标仍然我有问题，如何我可以解决我的问题，请帮助我。

searchCursor= dbReaderContact.rawQuery(query, null); 
startManagingCursor(searchCursor); 
String[] from=new String[] {ALDbAdapter.TITLE,DbAdapter.CATID,DbAdapter.LTID,DbAdapter.RK,DbAdapter.SUBTITLE}; 
         int [] to=new int[] {R.layout.ctllist_item}; 
catSearchAdapter=new CategorySearchAdapter(context, R.layout.ctllist_item, searchCursor, from, to); 

//////////////Adapter calss 

public class CategorySearchAdapter extends SimpleCursorAdapter implements Filterable{ 

    private Context context; 
    private int layout; 
    private ALDbAdapter dbadapter; 

    /** 
    * @param context 
    * @param layout 
    * @param c 
    * @param from 
    * @param to 
    */ 
    public CategorySearchAdapter(Context context, int layout, Cursor c, String[] from, int[] to) { 
     super(context, layout, c, from, to); 
     this.layout=layout; 
     this.context=context; 

     dbadapter=new ALDbAdapter(context); 
     try { 
      dbadapter.openAngiesListDb(); 
     } catch (Exception e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 

    @Override 
     public Cursor runQueryOnBackgroundThread(CharSequence constraint) { 
      if (getFilterQueryProvider() != null) { return getFilterQueryProvider().runQuery(constraint); } 

      StringBuilder buffer = null; 
      String[] args = null; 
      if (constraint != null) { 
       buffer = new StringBuilder(); 
       buffer.append("UPPER("); 
       buffer.append("name"); 
       buffer.append(") GLOB ?"); 
       args = new String[] { constraint.toString().toUpperCase() + "*" }; 
      } 
      Cursor c=null; 
      // c=dbadapter.getPartialNamesSearch(constraint.toString()); 
      return c; 
     } 
    @Override 
     public void bindView(View v, Context context, Cursor c) { 

      TextView subTitle=(TextView)v.findViewById(R.id.ctlName); 
      TextView title=(TextView)v.findViewById(R.id.cltAssocationName); 
      ImageView imgIcon=(ImageView)v.findViewById(R.id.ctlLogo); 

      int subTitInd=c.getColumnIndex(ALDbAdapter.SUBTITLE); 
      int titInd=c.getColumnIndex(ALDbAdapter.TITLE); 
      int ltId=c.getColumnIndex(ALDbAdapter.LTID); 
      int ltype=c.getInt(ltId); 
      if(!c.getString(subTitInd).equalsIgnoreCase("")){ 
       subTitle.setText(c.getString(subTitInd)); 
       title.setText(c.getString(titInd)); 
      }else{ 
       subTitle.setText(c.getString(titInd)); 
      } 
      if(ltype==1){ 
       imgIcon.setImageResource(R.drawable.logo1); 
      }else if(ltype==2){ 
       imgIcon.setImageResource(R.drawable.logo2); 
      }else{ 
       imgIcon.setImageResource(R.drawable.logo3); 
      } 
     } 

} 
//On post i closed the cursor 
///On Resume 

searchCursor= dbReaderContact.rawQuery(query, null); 
      startManagingCursor(searchCursor); 

Answer 1

你在谈论ListView并使用SimpleCursorAdapter。你不认为创建你自己的ArrayAdaptor不是更高效：你创建一个你自己的类来保存你的数据从你的数据库请求（迭代你的光标），然后填充该类的ArrayList。 然后，您将此ArrayList赋予扩展ArrayAdaptor的类。您应该将ArrayList存储在ArrayAdaptor中并覆盖构造函数和public View getView（int position，View convertView，ViewGroup parent）方法来创建ListView的每个视图。

你可以谷歌自定义ListView（第一个结果：http://www.softwarepassion.com/android-series-custom-listview-items-and-adapters/）。