Android linear layout

1. Overview : LinearLayout arranges containers one by one linearly
2. XML attributes

xml attribute Related methods effect
android:gratity setGravity Set the alignment, this attribute supports multiple attribute values, can be connected with vertical bars
android:orientation setOrientation Set the arrangement direction of the components in the container, horizontal (horizontal default) or vertical (vertical)

3. Case

  • Strings Strings.xml
 <?xml version="1.0"  encoding="utf-8"?>
<resources>
      <string name="action_settings">Settings</string>
      <string name="hello_world">Hello world!</string>
      <string name="btn1">按钮1</string>
      <string name="btn2">按钮2</string>
      <string name="btn3">按钮3</string>
      <string name="btn4">按钮4</string>
      <string name="btn5">按钮5</string>

 </resources>
  • Re-edit the layout file activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:gravity="center_horizontal"    à线性布局对齐方式
     android:orientation="vertical" >      à线性布局布局方向
    <Button

         android:id="@+id/btn1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/btn1" />
   
     <Button

         android:id="@+id/btn2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/btn2" />
   
     <Button

         android:id="@+id/btn3"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/btn3" />
   
     <Button

         android:id="@+id/btn4"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/btn4" />
   
     <Button

         android:id="@+id/btn5"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/btn5" />
   </LinearLayout> 

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