linphone-android/res/layout/chat.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:linphone="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
  	android:background="@drawable/background"
    android:orientation="vertical" >
    
    <LinearLayout 
	    android:layout_width="match_parent"
	    android:layout_height="match_parent"
	    android:paddingTop="20dp"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
	    android:layout_weight="0.4"
	    android:gravity="center"
	    android:orientation="horizontal">
        
        <org.linphone.ui.AvatarWithShadow
		    android:id="@+id/contactPicture"
		    android:layout_width="wrap_content"
		    android:layout_height="wrap_content"
		    linphone:picture="@drawable/unknown_small" />
	        
        <TextView
            android:id="@+id/contactName"
            android:paddingLeft="10dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
	    	android:textColor="@android:color/black" />
        
    </LinearLayout>
    
    <ScrollView 
        android:id="@+id/chatScrollView"
        android:paddingTop="10dp"
	    android:layout_width="match_parent"
	    android:layout_height="match_parent"
	    android:layout_weight="0.2" >
    
        <RelativeLayout
	        android:id="@+id/messages"
		    android:layout_width="match_parent"
		    android:layout_height="wrap_content"
		    android:paddingLeft="10dp"
		    android:paddingRight="10dp">
            
        </RelativeLayout>
        
    </ScrollView>
    
    <LinearLayout 
	    android:layout_width="match_parent"
	    android:layout_height="match_parent"
	    android:layout_weight="0.45"
	    android:gravity="center"
	    android:orientation="horizontal">
        
        <EditText
            android:id="@+id/message"
            android:inputType="textMultiLine"
            android:textColor="@android:color/black"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="0.21"
            android:background="@drawable/chat_message_background"
            android:padding="15dp"/>
                
        <ImageView
            android:contentDescription="@string/content_description_send_message"
            android:id="@+id/sendMessage"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="0.79"
            android:scaleType="fitXY"
            android:src="@drawable/chat_send_message" />
        
    </LinearLayout>
</LinearLayout>