Chat in android so that the message of the sender and recipient is on the other side

Question

 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);

           }

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

Answer 1

Use Custom adapterwith separate layouts for sender and recipient messages. He is called Heterogeneous ListView.

Something like that

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


    }



}

For more information, Custom adapteryou can refer to this

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

For a heterogeneous ListView guide (Various row layouts in ListView) you can refer to this

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

Answer 2

onBindViewHolder() recyclerView , "if". , , e.t.c. , , :

 RelativeLayout.LayoutParams params = 
 (RelativeLayout.LayoutParams)button.getLayoutParams();
 params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
 params.addRule(RelativeLayout.LEFT_OF, R.id.id_to_be_left_of);
 button.setLayoutParams(params);