Android Studio - Linear Layout 線性版面佈局（十一）

Android Studio - Linear Layout 線性版面佈局（十一）：

Linear Layout（線性版面佈局）是 Android 中較為常用的佈局方式，使用 ＜linearlayout＞ ＜/linearlayout＞ 標籤。線性佈局主要有兩種形式，一種是水平線性佈局（Horizontal Orientation），一種是垂直線性佈局（Vertical Orientation）。需要注意的是 Android 的線性佈局不會換行，當元件一個挨著一個地排列到頭之後，剩下的元件將不會被顯示出來。

Android Studio Linear Layout 線性版面佈局

• 操作系統：Windows 7 64-bit 版本 開發環境：Android Studio 4.0.1 版本
• Gradle 版本：6.1.1
• 手機測試版本：API 19
• 原程式：C:\Development\Development_Android\Android_Project\ Layout - LineraLayout
• 程式：C:\Development\Development_Android\Android_Project\ Layout - LineraLayout

Linear Layout - layout/activity_main.xml：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="#ff0"     android:orientation="vertical" >       <Button         android:id="@+id/Button15"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="left"         android:text="靠左" />       <Button         android:id="@+id/Button02"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_marginLeft="30dp"         android:text="離左邊界30dp" />       <Button         android:id="@+id/Button01"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="right"         android:text="靠右" />       <Button         android:id="@+id/Button03"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="center_horizontal"         android:text="置中" />       <TextView         android:layout_width="wrap_content"         android:layout_height="120dp"         android:layout_gravity="left"         android:background="#FF7428"         android:gravity="center"         android:text="(*^__^*) 嘻嘻……" />       <LinearLayout         android:layout_width="wrap_content"         android:layout_height="match_parent"         android:background="#cc0"         android:orientation="horizontal" >           <Button             android:id="@+id/Button14"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button14" />           <Button             android:id="@+id/button2"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button2" />           <Button             android:id="@+id/Button11"             android:layout_width="wrap_content"             android:layout_height="80dp"             android:text="以我為列高" />           <LinearLayout             android:layout_width="100dp"             android:layout_height="match_parent"             android:background="#f0f"             android:orientation="vertical" >               <Button                 android:id="@+id/button1"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Button15" />               <Button                 android:id="@+id/Button16"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Button16" />               <Button                 android:id="@+id/Button17"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Button17" />         </LinearLayout>     </LinearLayout>   </LinearLayout>

Linear Layout 線性版面佈局屬性

Linear Layout 線性版面佈局主要屬性：

XML attributes	Description
android:baselineAligned	When set to false, prevents the layout from aligning its children's baselines.
android:baselineAlignedChildIndex	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:divider	Drawable to use as a vertical divider between buttons.
android:gravity	Specifies how an object should position its content, on both the X and Y axes, within its own bounds.
android:measureWithLargestChild	When set to true, all children with a weight will be considered having the minimum size of the largest child.
android:orientation	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:layout_gravity	Gravity specifies how a component should be placed in its group of cells
android:layout_weight	Indicates how much of the extra space in the LinearLayout is allocated to the view associated with these LayoutParams
android:layout_margin	Specifies extra space on the left, top, right and bottom sides of this view.
android:layout_marginBottom	Specifies extra space on the bottom side of this view.
android:layout_marginEnd	Specifies extra space on the end side of this view.
android:layout_marginHorizontal	Specifies extra space on the left and right sides of this view.
android:layout_marginLeft	Specifies extra space on the left side of this view.
android:layout_marginRight	Specifies extra space on the right side of this view.
android:layout_marginStart	Specifies extra space on the start side of this view.
android:layout_marginTop	Specifies extra space on the top side of this view.
android:layout_marginVertical	Specifies extra space on the top and bottom sides of this view.

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