Android 每两分钟刷新一次列表视图

我正在尝试每两秒钟刷新一次我的

列表视图。首先执行
loadingTask
，适配器从arraylist chat填充ListView。然后每隔两秒钟，就会调用刷新适配器加载任务，并作为连续循环执行，然后再次填充arraylist聊天。我需要从
ArrayList
中删除以前的项目，只保留新项目。请了解如何实现这种道路通行功能。目前，我的数组一直以循环的形式填充以前httpcall中的项

int refreshInterval =2000; //set refresh interval

class loadingTask extends AsyncTask<Void, Void,Void> {

//arraylist
    chat = new ArrayList<Chat>();


    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();



    }

    @Override
    protected void onPostExecute(Void result) {
        // TODO Auto-generated method stub
        super.onPostExecute(result);

        ...

                for (int i=0;i<room_length;i++){
                JSONObject obj_value = responseArray.getJSONObject(i);

                if (obj_value.has("@id"))
                    id=obj_value.getString("@id");

                if (obj_value.has("@version"))
                    version=obj_value.getString("@version");

        ...


            chatAdapter = new ChatAdapter(m,chat);
            msgList.setAdapter(chatAdapter); //set data to listview
            chatAdapter.notifyDataSetChanged();//update changes
            msgList.setSelection(msgList.getAdapter().getCount()-1);


            handler.postDelayed(refreshView, refreshInterval);


    }

    @Override
    protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub



        return null;
    }




        public static class refreshAdapterLoadingTask extends AsyncTask<Void, Void,Void> {

    private String isMarketingMessage;

    @Override
    protected void onPreExecute() {
        // TODO Auto-generated method stub
        super.onPreExecute();

        //if(chat!=null)
            //chat.clear();
    }

    @Override
    protected void onPostExecute(Void result) { 
        // TODO Auto-generated method stub
        super.onPostExecute(result);

        try {
            ...

            for (int i=0;i< responseArray.length();i++){
                JSONObject obj_value = responseArray.getJSONObject(i);

                if (obj_value.has("@id"))
                    id=obj_value.getString("@id");

                if (obj_value.has("@version"))
                    version=obj_value.getString("@version");

                if (obj_value.has("@content"))
                    content=obj_value.getString("@content");

                if (obj_value.has("@sentDate"))
                    sentDate=obj_value.getString("@sentDate");

                if (obj_value.has("player"))
                    player=obj_value.getString("player");

                chat.add(new Chat(isMarketingMessage, id, version,content, sentDate, player));


            }


        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }



        //remove previous arraylist values
    //  for (int i=0;i<previousArrayListSize;i++){
        //  chat.remove(i);
        //}



        handler.postDelayed(refreshView, refreshInterval);

        chatAdapter = new ChatAdapter(m,chat);
        chatAdapter.notifyDataSetChanged();


    }

    @Override
    protected Void doInBackground(Void... params) {
        // TODO Auto-generated method stub

        return null;
    }
}



}

尝试以下代码

new Handler().postDelayed(new Runnable() {
        @Override
        //automatically disappear after given time and start game
        public void run() {
            //call your loadingTask here
        }
    }, refreshInterval);

并在post execute中调用相同的方法

希望这将帮助您
尝试以下代码

new Handler().postDelayed(new Runnable() {
        @Override
        //automatically disappear after given time and start game
        public void run() {
            //call your loadingTask here
        }
    }, refreshInterval);

// Using Timer and Runnable method you can list refresh

Timer  t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {

    @Override
    public void run() {
                   // your process 
        process();
    }

}, 0, 2000);

// Process method
private void process() {

    new Thread(new Runnable() {

        public void run() {
            try {
                // LiveScoredata();
            } catch (Exception e) {

            }
            runOnUiThread(new Runnable() {

                public void run() {
                    try {
                        //your list fill hear 
                        adapter.notifyDataSetChanged();

                    } catch (Exception e) {

                    }
                }
            });
        }

    }).start();

}

并在post execute中调用相同的方法

希望这将对您有所帮助
我只需要从arraylist中删除以前设置的项而无需用户通知arraylist已清除我只需要从arraylist中删除以前设置的项而无需用户通知arraylist已清除adapter notifydatasetchanged清除arraylist并填写arraylist检查更新我将您的代码与您告诉我的操作一致但如果我清除了chat arraylist，则在更新之前，在清除数组列表之后，所有记录都将消失。在列表或适配器中填充数据。notifyDataSetChanged（）；使用此选项。然后如果（chat！=null）chat.clear（）；然后填充适配器并在listview中设置适配器。当chat arraylist变为null时，arrayadapter也将变为null上述适配器notifydatasetchanged clear arraylist and fill arraylist检查更新我按照您告诉我的操作将您的代码放入，但如果我清除chat arraylist，则在更新之前所有记录都将消失清除数组列表填充数据之后在列表或适配器中。notifyDataSetChanged（）；使用此选项。然后如果（chat！=null）chat.clear（）；然后填充适配器并在listview中设置适配器。当聊天室arraylist变为空时，arrayadapter也将变为空
// Using Timer and Runnable method you can list refresh

Timer  t = new Timer();
t.scheduleAtFixedRate(new TimerTask() {

    @Override
    public void run() {
                   // your process 
        process();
    }

}, 0, 2000);

// Process method
private void process() {

    new Thread(new Runnable() {

        public void run() {
            try {
                // LiveScoredata();
            } catch (Exception e) {

            }
            runOnUiThread(new Runnable() {

                public void run() {
                    try {
                        //your list fill hear 
                        adapter.notifyDataSetChanged();

                    } catch (Exception e) {

                    }
                }
            });
        }

    }).start();

}