Align ImageView to Left or Right of LinearLayout on Runtime

Question

I have a LinearLayout and ImageView , when user receives a message the ImageView should be on the right and LinearLayout on it's left, and when sends a message, the ImageView should be on the left and the LinearLayout on it's right. how can i do this on runtime?

here is my xml

   <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

       <ImageView
           android:id="@+id/imageViewDelivered"
           android:layout_width="15sp"
           android:layout_height="15sp"
           android:src="@drawable/success"
           android:layout_gravity="bottom"
           android:layout_marginRight="4sp"
           android:layout_marginLeft="4sp"
           android:layout_marginBottom="2sp"
           android:contentDescription="@string/emptytext" />

        <LinearLayout
            android:id="@+id/contentWithBackground"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:background="@drawable/incoming_message_bg"
            android:paddingLeft="10dp"
            android:paddingBottom="10dp"
            android:orientation="vertical">

            <TextView
                android:id="@+id/txtMessage"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:textColor="@android:color/black"
                android:layout_marginRight="5sp"
                android:layout_marginLeft="5sp"
                android:maxWidth="250dp" />

        </LinearLayout>
    </LinearLayout>

thanks.

Answer 1

First change the root layout(which is parent of your LinearLayout and ImageView ) to RelativeLayout in your xml file.

Initialize both views:

LinearLayout linear=(LinearLayout)findViewById(R.id.contentWithBackground);
ImageView image=(ImageView)findViewById(R.id.imageViewDelivered);

Initialize the LayoutParam of LinearLayout and ImageView :

RelativeLayout.LayoutParams linearLp=(RelativeLayout.LayoutParams)linear.getLayoutParams();
RelativeLayout.LayoutParams imageLp=(RelativeLayout.LayoutParams)image.getLayoutParams();

To set the LinearLayout to left of ImageView :

linearLp.addRule(RelativeLayout.LEFT_OF,image.getId());

To set the LinearLayout to right of ImageView :

linearLp.addRule(RelativeLayout.RIGHT_OF,image.getId());