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嗨，我正在为我的列表视图使用光标适配器，我的问题是当我将应用程序置于后台时，重新调整我的屏幕是空的，在 onresume 中我打开数据库并创建光标仍然有问题，我该如何解决我的问题，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);
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1 回答 1

1

您正在谈论 ListView 并使用 SimpleCursorAdapter。您不认为创建自己的 ArrayAdaptor 效率不高吗：您创建自己的类来保存您想要从 DB 请求中获取的数据（遍历您的 Cursor），然后填充该类的 ArrayList。然后你把这个 ArrayList 给一个扩展 ArrayAdaptor 的类。您应该将 ArrayList 存储在 ArrayAdaptor 中并覆盖构造函数和公共 View getView(int position, View convertView, ViewGroup parent) 方法来创建 ListView 的每个视图。

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

于 2011-04-30T12:52:19.713 回答