android:layout_weight

We have a LinearLayout with Horizontal orientation, and a EditText, a Button inside.

1. If we want both the EditText and the Button take half width of the screen, set both of them:

    
   x
   android:layout_width="0dp"
   android:layout_weight="1"
   

2. The EditText take 2/3, and the Button take 1/3 of the screen,

   In EditText:

    
   x
   android:layout_width="0dp"
   android:layout_weight="2"
   

   In Button:

    
   xxxxxxxxxx
   android:layout_width="0dp"
   android:layout_weight="1"