如何使用 Cursor Adapter 刷新 listView [英] how to refresh the listView using the Cursor Adapter

问题描述

我使用 CursorAdapter 创建了一个 ListView .现在我正在尝试更新 ListView 并将值刷新到 ListView .

I have created a ListView using CursorAdapter . Now I am Trying to update the ListView and Refresh the value to the ListView .

但我无法弄清楚.如何使用 Loader 或 changeCursor() 来刷新我的 ListView

But I am not able to figure out . How to work with Loader or changeCursor() to refresh my ListView

下面是我设置CursorAdapter的代码:

//到这里就成功了

SQLDataSore datastore = new SQLDataSore(PrintContent.this);

Cursor cursor                 = datastore.getJSONData();

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

list_View.setAdapter(cursorDemo);

My Button onClick 我正在将值更新到数据库中//成功完成

My Button onClick I am updating the Value into the Database //SucessFully Done

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:

My UpdateData Method:

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

CursorDemo Class

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;
        }

    }

感谢任何帮助...});

Any Help is Appreciated... });

推荐答案

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

If CursorDemo extends CursorAdapter, then you have to use adapter.swapCursor(cursor_update);

那应该将旧光标替换为新光标并重新加载数据.使用 swapCursor，旧游标不会关闭.

That should swap the old cursor out for the new one and reload the data. With swapCursor, the old cursor is not closed.

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