android视图组件容器组件与布局管理器LinearLayout

Android应用的所有UI组件都继承了View类，ViewGroup通常作为其他组件的容器使用。

 

ViewGroup是View的子类，ViewGroup中除了包含普通的View组件之外，还可以再次包含ViewGroup组件。

 android常用布局：

1.linearLayout 线性布局

重要的方法和属性：

XML Attributes

Attribute Name	Related Method	Description
android:baselineAligned	setBaselineAligned(boolean)	When set to false, prevents the layout from aligning its children's baselines.
android:baselineAlignedChildIndex	setBaselineAlignedChildIndex(int)	When a linear layout is part of another layout that is baseline aligned, it can specify which of its children to baseline align to (that is, which child TextView).
android:gravity	setGravity(int)	Specifies how to place the content of an object, both on the x- and y-axis, within the object itself.
android:measureWithLargestChild		When set to true, all children with a weight will be considered having the minimum size of the largest child.
android:orientation	setOrientation(int)	Should the layout be a column or a row? Use "horizontal" for a row, "vertical" for a column.
android:weightSum		Defines the maximum weight sum.

android：gravity，设置布局管理器组件内的对其方式，支持top，right等，也可以是组合的，leftcenter_vertical等

 

android：orientation设置组件排列方式，水平和垂直排列

 demo代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"  
  android:layout_height="wrap_content" 
  android:orientation="vertical" 
  android:layout_width="fill_parent">
  <TextView android:text="linearLayout测试"
            android:paddingTop="20dip" 
            android:paddingBottom="20dip"
            android:id="@+id/TextView01" 
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" 
            android:gravity="center"
            android:soundEffectsEnabled="true" android:password="false"
            android:textStyle="bold">
   </TextView>
   
   <LinearLayout
       android:id="@+id/layout1"
       android:gravity="center"
       android:paddingBottom="20dip"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content">      
     <TextView
       android:id="@+id/txtName"
       android:text="帐号"
       android:minWidth="80dip"
       android:gravity="center"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content">   
     </TextView>
     <EditText         
       android:id="@+id/edtName"       
       android:minWidth="120dip"      
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
     >
     </EditText>
   </LinearLayout>
   
    <LinearLayout
       android:id="@+id/layout2"
       android:gravity="center"
       android:layout_width="fill_parent"
       android:layout_height="wrap_content">      
     <TextView
       android:id="@+id/txtPsw"
       android:minWidth="80dip"
       android:gravity="center"
       android:text="密码"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content">   
     </TextView>
     <EditText         
       android:id="@+id/edtPassword"       
       android:minWidth="120dip"      
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
     >
     </EditText>
   </LinearLayout>
   
   <LinearLayout
      android:id="@+id/layout3"
      android:gravity="right"
      android:layout_width="fill_parent"
      android:layout_height="wrap_content"
   >
      
      <Button android:id="@+id/btnOk"
        android:minWidth="70dip"
        android:text="登录"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
      >
      </Button>
      
      <Button android:id="@+id/btnCancel"
        android:minWidth="70dip"
        android:text="取消"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
      >
      </Button>
   </LinearLayout>
</LinearLayout>

效果如下图所示：

 

注：LinearLayout 默认     android:orientation="horizontal"

 

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