android中的聊天应用程序，以便发送者和接收者的消息应该在不同的一侧 [英] chat application in android so that sender and receiver message should be on different side

问题描述

 protected void onPostExecute( ArrayList<HashMap<String,String>> myArrayList)//    for arraylist(ArrayList<String> result)
   {                            

       for (HashMap<String, String> data : myArrayList)
      {
           String sender_no = data.get(TAG_SENDER_NO);
           String msg1=data.get(TAG_SEN_MSG);
           String receiver_no=data.get(TAG_RECEIVER_NO);

           if(sender_no.equals(senderno))
           {

           ListAdapter adapter = new SimpleAdapter(SinglechatActivity.this, myArrayList,R.layout.list_row_layout_even, 
           new String[] { TAG_SEN_MSG },new int[] { R.id.message_me });

        //  CustomList adapter= new CustomList(SinglechatActivity.this,myArrayList);//sender_no,  msg1,   receiver_no);

         ListView  lv = (ListView) findViewById(R.id.listview);
           lv.setAdapter( adapter);

          }

           else

           {
               ListAdapter adapter = new SimpleAdapter(SinglechatActivity.this, myArrayList,R.layout.list_row_layout_odd, 
                       new String[] { TAG_SEN_MSG },new int[] { R.id.message_frnd });

                //  CustomList adapter= new CustomList(SinglechatActivity.this,  sender_no,  msg1,   receiver_no);

                 ListView  lv = (ListView) findViewById(R.id.listview);
                   lv.setAdapter( adapter);

           }

在这里，我想根据发送方和接收方在右侧和左侧显示消息.

In this, I would like to have message on right hand side and left hand side based on the sender and receiver.

推荐答案

使用 自定义适配器 为发送者和接收者消息提供单独的布局.它被称为Heterogeneous ListView.

Use Custom adapter with separate layouts for sender and receiver messages. It is called Heterogeneous ListView.

类似的东西

public class MyAdapter extends BaseAdapter {

    ArrayList<HashMap<String,String>> messages;
    int SENDER_MESSAGE = 0;
    int RECEIVER_MESSAGE = 1;
    Context context;

    @Override
    public int getCount() {
        return messages.size();
    }

    @Override
    public Object getItem(int position) {
        return messages.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

    @Override
    public int getItemViewType(int position) {

        //This is dummy logic
        //Write your own logic to differentiate between sender and receiver message
        if (position % 2 == 0) {
            return SENDER_MESSAGE;
        }

        else {
            return RECEIVER_MESSAGE;
        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            if (getItemViewType(position) == SENDER_MESSAGE) {
                convertView = inflater.inflate(R.layout.sender_message_layout, null);
            } 

            else {
                //Received message
                convertView = inflater.inflate(R.layout.received_message_layout, null);
            }
        }

            //...set text to message layout here


    }



}

有关自定义适配器的更多信息，您可以参考此

For more info on Custom Adapter you can refer this

http://www.vogella.com/articles/AndroidListView/article.html#adapterown_example

对于异构 ListView(ListView 中的不同行布局)教程，您可以参考此

For heterogeneous ListView (Different row layouts in ListView) tutorial you can refer this

http://chrislee.kr/wp/tag/getitemviewtype-tutorial/

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