XML : ViewGroups

redd

1. <LinearLayout
   
2.     android:orientation="vertical"
   
3.     android:layout_width="wrap_content"
   
4.     android:layout_height="wrap_content">
   
5. 
   
6.     <TextView
   
7.         android:text="Guest List"
   
8.         android:layout_width="wrap_content"
   
9.         android:layout_height="wrap_content" />
   
10. 
    
11.     <TextView
    
12.         android:text="Kunal"
    
13.         android:layout_width="wrap_content"
    
14.         android:layout_height="wrap_content" />
    
15. 
    
16. </LinearLayout>

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redd

xmlns : XML namespace declaration

1. <LinearLayout
   
2.     xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     android:orientation="horizontal"
   
4.     android:layout_width="wrap_content"
   
5.     android:layout_height="wrap_content">
   
6. 
   
7.     <TextView
   
8.         android:text="Guest List"
   
9.         android:layout_width="wrap_content"
   
10.         android:layout_height="wrap_content"
    
11.         android:textSize="24sp"  />
    
12. 
    
13.     <TextView
    
14.         android:text="Redd"
    
15.         android:layout_width="wrap_content"
    
16.         android:layout_height="wrap_content"
    
17.         android:textSize="24sp"  />
    
18. 
    
19. </LinearLayout>

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redd

1. android:orientation="vertical"
   
2. android:orientation="horizontal"

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redd

parent view 可以這樣設定，長寬和手機螢幕一樣大：

1. android:layout_width="match_parent"
   
2. android:layout_height="match_parent"

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child view 可以這樣設定：

1. android:layout_width="match_parent"
   
2. android:layout_height="wrap_content"

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redd

1. android:layout_weight="1"

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LinearLayout also supports assigning a weight to individual children with the android:layout_weight attribute. This attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen. A larger weight value allows it to expand to fill any remaining space in the parent view. Child views can specify a weight value, and then any remaining space in the view group is assigned to children in the proportion of their declared weight. Default weight is zero.

For example, if there are three text fields and two of them declare a weight of 1, while the other is given no weight, the third text field without weight will not grow and will only occupy the area required by its content. The other two will expand equally to fill the space remaining after all three fields are measured. If the third field is then given a weight of 2 (instead of 0), then it is now declared more important than both the others, so it gets half the total remaining space, while the first two share the rest equally.