Android base TOP3: Features of linear layout, common attributes, and weight values, androidtop3

Android base TOP3: Features of linear layout, common attributes, and weight values, androidtop3

Linear layout is a horizontal or vertical layout of views;

Common attributes:

Androuid: orientation: indicates the layout direction

• The vertical value indicates the vertical layout.
• The value horizontal indicates horizontal layout.

Android: gravity indicates view alignment

• Content includes TOP, bottom, left, right, center_vertical, center_horizontal, center
• You can use "|" to separate multiple values.

The following attributes can be used for a view in the layout:

Android: layout_gravity indicates the alignment of a single view

Android: layout_weight indicates the proportion of the size of a single view

• When Layout_weight is 0, the View Size is determined.
• When layout_weight is greater than 0, the view is stretched according to the specific gravity in the linear layout direction.

Code Demonstration:

 1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3     android:layout_width="match_parent" 4     android:layout_height="match_parent" 5     android:orientation="horizontal" > 6     <Button  7         android:layout_width="200dp" 8         android:layout_height="100dp" 9         android:text="adaflkjn"10         android:gravity="bottom|center_horizontal"/>11 12 </LinearLayout>

Android: gravity: determines the position of elements in the control.

<Button         android:layout_width="200dp"        android:layout_height="100dp"        android:text="adaflkjn"        android:layout_gravity="center"/>

 

Android: layout_gravity indicates the position of the current element in the parent element.

Weight applications

<EditText        android:layout_width="0dp"       android:layout_height="wrap_content"       android:layout_weight="1"       android:hint="sdaf"/>   <Button        android:layout_width="1dp"       android:layout_height="wrap_content"       android:layout_weight="0"       android:text="klndgjl"       />

<TextView android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: layout_weight = "0" android: text = "weight 0" android: background = "# FFF0F5"/> <TextView android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: text = "weight is 1" android: layout_weight = "1" android: background = "#800080"/> <TextView android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: text = "weight is 4" android: layout_weight = "4" android: background = "#4B0082"/>