Android: how to change layout_gravity property of name string as a list

I am trying to implement chats that can appear on the left or right. I have read many answers already posted here but I have not been able to get any of them to work for me, maybe I am missing something.

If I change the layout_gravity linearLayout in the row_item xml from left to right by hand, and then look at the graphic layout, I can see that it works as I wanted. the problem is that I cannot control this property. as I understand the problem is because existing LayoutParams have listview.LayoutParams and if I try to get LayoutParams for listview.LayoutParams object it works. but this is not what I am trying to achieve.

here's the code:

xml activity

<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:ignore="MergeRootFrame" >

<ListView
    android:id="@+id/listViewMessages"
    android:layout_width="match_parent"
    android:layout_height="0dp" 
    android:layout_weight="0.98" >

</ListView>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="0.02"
    android:background="#D3D3D3"
    android:orientation="horizontal" >

    <EditText
        android:id="@+id/editTextMessage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_toLeftOf="@+id/imageButtonSend"
        android:ems="10"
        android:hint="@string/textFieldMessage"
        android:textSize="14sp"
        android:visibility="visible" >

        <requestFocus />
    </EditText>

    <ImageButton
        android:id="@+id/imageButtonSend"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="14dp"
        android:background="?android:attr/selectableItemBackground"
        android:contentDescription="@string/imageButtonSendNow_contentDescription"
        android:src="@drawable/ic_action_send_now" 
        android:onClick="onClick" />

</RelativeLayout>

</LinearLayout>

      

        
        
        
      

    

row_item xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/singleMessageContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:orientation="horizontal"
android:padding="6dp" >

    <TextView
        android:id="@+id/textViewMessage"
        android:layout_width="wrap_content"
        android:layout_height="20dp"
        android:layout_weight="0.85"
        android:layout_marginBottom="2dp"
        android:layout_marginLeft="5dp"
        android:layout_marginTop="2dp"
        android:gravity="center_vertical"
        android:text="Message"
        android:textSize="16sp"
        tools:ignore="HardcodedText" />

    <TextView
        android:id="@+id/TextViewTime"
        android:layout_width="wrap_content"
        android:layout_height="14dp"
        android:layout_weight="0.1"
        android:layout_gravity="bottom"
        android:layout_marginLeft="22dp"
        android:gravity="center_vertical"
        android:text="Time"
        android:textSize="12sp"
        tools:ignore="HardcodedText" />

    <ImageView
        android:id="@+id/imageViewSuccess"
        android:layout_width="12dp"
        android:layout_height="12dp"
        android:layout_weight="0.05"
        android:layout_gravity="bottom"
        android:contentDescription="successIcon"
        android:src="@drawable/ic_action_accept"
        tools:ignore="HardcodedText" />

  </LinearLayout>

      

        
        
        
      

    

adapter code:

public class ConversationAdapter extends ArrayAdapter<Message> {

private final Context context;

static class ViewHolder {
    public TextView message;
    public TextView time;
    public ImageView success;
    public LinearLayout singleMessageContainer;

}

public ConversationAdapter(Context context, ArrayList<Message> values) {
    super(context, R.layout.conversation_list_item, values);
    this.context = context;

}

  @Override
public View getView(int position, View convertView, ViewGroup parent) {
      View rowView = convertView;
        // reuse views
        if (rowView == null) {
          LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
          rowView = inflater.inflate(R.layout.conversation_list_item, parent,false);
          // configure view holder
          ViewHolder viewHolder = new ViewHolder();
          viewHolder.message = (TextView) rowView.findViewById(R.id.textViewMessage);
          viewHolder.time = (TextView) rowView.findViewById(R.id.TextViewTime);
          viewHolder.success = (ImageView) rowView.findViewById(R.id.imageViewSuccess);
          viewHolder.singleMessageContainer = (LinearLayout)     rowView.findViewById(R.id.singleMessageContainer);

          rowView.setTag(viewHolder);
        }

        // fill data
        ViewHolder holder = (ViewHolder) rowView.getTag();

        holder.message.setText(getItem(position).getMessage());
        holder.time.setText(getItem(position).getUniversalTimeString());
        holder.success.setImageResource(R.drawable.ic_action_accept);

        boolean isMine = (getItem(position).getSender() == 0);

        holder.singleMessageContainer.setBackgroundResource(
                isMine ? R.drawable.bubble_yellow : R.drawable.bubble_green);

        // This part doesn't work
        LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) 
                holder.singleMessageContainer.getLayoutParams();
        params.gravity=(isMine ? Gravity.LEFT : Gravity.RIGHT);

        holder.singleMessageContainer.setLayoutParams(params);

        return rowView; 
  }

}