如何使用Cursor Adapter刷新listView

Question

我创建了一个ListView使用CursorAdapter.现在我正在尝试更新ListView和刷新ListView的值.

但我无法弄明白.如何使用Loader或changeCursor()刷新我的ListView

以下是我的设置代码CursorAdapter:

// SucessFully在这里完成

SQLDataSore datastore = new SQLDataSore(PrintContent.this);

Cursor cursor                 = datastore.getJSONData();

final CursorDemo cursorDemo = new CursorDemo(PrintContent.this, cursor);

list_View.setAdapter(cursorDemo);

我Button onClick正在将值更新到数据库// SucessFully完成

btn_check.setOnClickListener( new OnClickListener() {

            @Override
            public void onClick(View view ) {

                String editTextValue = edit_check.getText().toString();

                if (editTextValue!=null) {


                    SQLDataSore sqlDataSore = new SQLDataSore(PrintContent.this);

                    Cursor cursor_update = sqlDataSore.updateData(editTextValue);

//Here How Should I update my ListView ...?
                }

            }

我的UpdateData方法:

public Cursor updateData(String editContent){

        SQLiteDatabase updateContent = getReadableDatabase();


        Cursor cursor_update = updateContent.rawQuery( "update " +TABLE_NAME + " set content = '"+ editContent
                +"' "+" where _id = 357", null);

        return cursor_update;
    }

CursorDemo类

public class CursorDemo extends CursorAdapter{

        public CursorDemo(Context context, Cursor c) {

            super(context, c , false);
            // TODO Auto-generated constructor stub
        }

        @Override
        public void changeCursor(Cursor cursor) {
            // TODO Auto-generated method stub
            super.changeCursor(cursor);
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            // TODO Auto-generated method stub

            TextView txt_content        = (TextView) view.findViewById(R.id.txt_content);
            TextView txt_likes_count    = (TextView) view.findViewById(R.id.txt_likescount);
            TextView txt_name         = (TextView) view.findViewById(R.id.txt_name);
            TextView txt_display_name = (TextView) view.findViewById(R.id.txt_display_name);

            txt_content.setText(cursor.getString(cursor.getColumnIndex("content")));

        }

        @Override
        public View newView(Context context , Cursor cursor, ViewGroup viewGroup) {
            // TODO Auto-generated method stub
            LayoutInflater inflater = LayoutInflater.from(context);
            View view = inflater.inflate(R.layout.message_row_view, viewGroup ,false);

            return view;
        }

    }

任何帮助都得到了赞赏......});

Answer 1

如果CursorDemo扩展了CursorAdapter,那么你必须使用 adapter.swapCursor(cursor_update);

这应该将旧光标换成新光标并重新加载数据.使用时swapCursor,旧光标未关闭.