The EditText widget by default is single line. In order to allow mutiple lines modify and customize the widget definition in the layout file as below:
<EditText
android:singleLine="false"<!-- The Default Value is true, change to false -->
android:lines="8"<!-- The Height of Widget in terms of total Lines -->
android:minLines="6"<!-- Minimum number of lines -->
android:maxLines="10"<!-- Maximum Lines of lines -->
android:scrollbars="vertical"<!-- Vertical Scroll Bar to visible for easy scrolling -->
android:gravity="top|left"<!-- Cursor Position in the widget-->
android:layout_height="wrap_content"<!-- Either Fixed DP or based on the Content Text -->
android:layout_width="fill_parent"<!-- Either Fixed DP or Span accross parent width -->
/>