Gravity not set properlywith LayoutParams in onBindViewHolder

Question

I have a chat activity that is arranging messages based on the username of the sender. All of the behavior outlined in onBindViewHolder is working properly, except for the Gravity of the container (all messages are aligning end when they should be aligning start and end for partner and logged in user, respectively). What have I done wrong in the implementation of LayoutParams?

Here is my code:

@Override
public void onBindViewHolder(@NonNull DMViewHolder holder, int position) {

    // This method fills fields with data for each list item


    Message message = messageList.get(position);

    String signedInUserID = FirebaseAuth.getInstance().getCurrentUser().getUid();

    boolean isSignedInUser = message.getAuthorUID().equals(signedInUserID);

    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("hh:mm a");

    holder.message.setText(message.getMessage());
    holder.date.setText(simpleDateFormat.format(message.getTimestamp()));


    if (isSignedInUser) {
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        params.addRule(RelativeLayout.ALIGN_END);
        holder.singleDMContainer.setLayoutParams(params);

        holder.textContainer.setBackgroundResource(R.drawable.user_message_text_background);
    } else {
        RelativeLayout.LayoutParams params2= new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        params2.addRule(RelativeLayout.ALIGN_START);
        holder.singleDMContainer.setLayoutParams(params2);

        holder.textContainer.setBackgroundResource(R.drawable.partner_message_text_background);
    }


}

and the xml file for the messages:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/singleDMContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:orientation="horizontal">


    <RelativeLayout
        android:id="@+id/text_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginStart="10dp"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="5dp"
        android:background="@drawable/user_message_text_background">

        <TextView
            android:id="@+id/dm_message"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:fontFamily="@font/nunito_extralight"
            android:gravity="start"
            android:padding="5dp"
            android:text="@string/sample_message"
            android:textColor="@android:color/black"
            android:textSize="18sp"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/dm_date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_toEndOf="@+id/dm_message"
            android:fontFamily="@font/nunito_extralight"
            android:padding="5dp"
            android:text="@string/sample_time"
            android:textColor="@android:color/black"
            android:textSize="12sp"
            android:textStyle="normal" />

    </RelativeLayout>


</RelativeLayout>

atarasenko · Accepted Answer · 2018-11-04T20:25:19.617

1

Apply the rule to the child view, not to the container: replace

holder.singleDMContainer.setLayoutParams(params2);

with

holder.textContainer.setLayoutParams(params2);

UPDATE:

Also use RelativeLayout.ALIGN_PARENT_START instead of RelativeLayout.ALIGN_START, and RelativeLayout.ALIGN_PARENT_END instead of RelativeLayout.ALIGN_END.

edited Nov 04 '18 at 20:25

answered Nov 04 '18 at 01:42

atarasenko

1,768
14
19

They still appear on the same side. Oddly enough, all messages align Start when I do it this way instead of End. – andrewedgar Nov 04 '18 at 17:51
This did it. I was reading the wrong documentation. Thank you. – andrewedgar Nov 05 '18 at 00:17

Gravity not set properlywith LayoutParams in onBindViewHolder

1 Answers1