前言

　　今天把对于布局的一些理解写下来，主要内容包括控件的属性的继承关系，控件与容器的属性的关系，以及各种类的属性的使用。

控件的属性种类

　　通常意义上讲，我们在对一个控件进行属性赋值的时候大体上有种类型的属性，一种为layout_开头的属性，一种为不是以layout_开头的属性，下面以TextView为例进行说明，如下所示

　　

 <RelativeLayout

     android:layout_width="match_parent"

     android:layout_height="match_parent" >

     <TextView

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="hello_world" />

 </RelativeLayout>

　　我为TextView设置了三个属性layout_width、layout_height以及text，可以看到这三个属性中layout_width、layout_height属性为layout_开头而text没有以Layout_开头。

　　以layout_开头的属性为从容器中继承的属性，在这个例子里面即是从RelativeLayout中继承来的，TextView本身并没有此属性。而text则是TextView自身拥有的属性。

　　为了说明layout属性为容器属性，我做了下面的例子，把TextView分别放置到RelativeLayout和LinearLayout中，然后对TextView设置layout_centerInParent属性，之所有选择这个属性，是因为这个属性为RelativeLayout所有而LinearLayout没有，实验代码如下

　　

 <RelativeLayout

     android:layout_width="wrap_content"

     android:layout_height="wrap_content" >

     <TextView

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_centerInParent="true"

         android:text="hello_world" />

 </RelativeLayout>

 <LinearLayout

     android:layout_width="wrap_content"

     android:layout_height="wrap_content" >

     <TextView

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_centerInParent="true"

         android:text="hello world2" />

 </LinearLayout>

　　如上进行设置之后会发现，编辑器提示“Invalid layout param in a LinearLayout: layout_centerInParent”，如下所示

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" alt="" />

　　通过此实验可以得出结论，layout开头的属性并非TextView所拥有，而是继承的容器中关于布局的属性，继而推而广之，可以得出结论，控件的属性可以分为自身属性和容器中的布局属性。下面就通过TextView和各个布局容器一起来详细分析下属性。

LinearLayout和TextView

　　这一小节主要介绍下LinearLayout和TextView的属性，先来看下TextView的属性，及属性继承关系，

　　下面为TextView自身所拥有的属性

XML Attributes
Attribute Name
android:autoLink
android:autoText
android:bufferType
android:capitalize
android:cursorVisible
android:digits
android:drawableBottom
android:drawableEnd
android:drawableLeft
android:drawablePadding
android:drawableRight
android:drawableStart
android:drawableTop
android:editable
android:editorExtras
android:ellipsize
android:ems
android:fontFamily
android:freezesText
android:gravity
android:height
android:hint
android:imeActionId
android:imeActionLabel
android:imeOptions
android:includeFontPadding
android:inputMethod
android:inputType
android:lineSpacingExtra
android:lineSpacingMultiplier
android:lines
android:linksClickable
android:marqueeRepeatLimit
android:maxEms
android:maxHeight
android:maxLength
android:maxLines
android:maxWidth
android:minEms
android:minHeight
android:minLines
android:minWidth
android:numeric
android:password
android:phoneNumber
android:privateImeOptions
android:scrollHorizontally
android:selectAllOnFocus
android:shadowColor
android:shadowDx
android:shadowDy
android:shadowRadius
android:singleLine
android:text
android:textAllCaps
android:textAppearance
android:textColor
android:textColorHighlight
android:textColorHint
android:textColorLink
android:textIsSelectable
android:textScaleX
android:textSize
android:textStyle
android:typeface
android:width

　　
　　TextView继承属性

　　

Inherited XML Attributes

From class android.view.View

Attribute Name
android:accessibilityLiveRegion
android:alpha
android:background
android:clickable
android:contentDescription
android:drawingCacheQuality
android:duplicateParentState
android:fadeScrollbars
android:fadingEdgeLength
android:filterTouchesWhenObscured
android:fitsSystemWindows
android:focusable
android:focusableInTouchMode
android:hapticFeedbackEnabled
android:id
android:importantForAccessibility
android:isScrollContainer
android:keepScreenOn
android:layerType
android:layoutDirection
android:longClickable
android:minHeight
android:minWidth
android:nextFocusDown
android:nextFocusForward
android:nextFocusLeft
android:nextFocusRight
android:nextFocusUp
android:onClick
android:padding
android:paddingBottom
android:paddingEnd
android:paddingLeft
android:paddingRight
android:paddingStart
android:paddingTop
android:requiresFadingEdge
android:rotation
android:rotationX
android:rotationY
android:saveEnabled
android:scaleX
android:scaleY
android:scrollX
android:scrollY
android:scrollbarAlwaysDrawHorizontalTrack
android:scrollbarAlwaysDrawVerticalTrack
android:scrollbarDefaultDelayBeforeFade
android:scrollbarFadeDuration
android:scrollbarSize
android:scrollbarStyle
android:scrollbarThumbHorizontal
android:scrollbarThumbVertical
android:scrollbarTrackHorizontal
android:scrollbarTrackVertical
android:scrollbars
android:soundEffectsEnabled
android:tag
android:textAlignment
android:textDirection
android:transformPivotX
android:transformPivotY
android:translationX
android:translationY
android:visibility

　　也就是说这两部分加起来就是TextView的全部属性，然而我们在XML编辑器中编辑代码的时候会发现，除了以上属性外还有很多以layout开头的属性可以设置，这些就是容器的属性，下面以LinearLayout为例，实验场景如下

　　

 <LinearLayout

     android:layout_width="wrap_content"

     android:layout_height="wrap_content" >

     <TextView

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:text="hello world2" />

 </LinearLayout>

　　下面我们就看下LinearLayout的布局属性，通过LinearLayout.LayoutParams类来体现

　　通过帮助文档可以看到，其自身属性为以下内容

　　

XML Attributes
Attribute Name
android:layout_gravity
android:layout_weight

　　还有继承了两类属性，android.view.ViewGroup.MarginLayoutParams

　　

Attribute Name
android:layout_marginBottom
android:layout_marginEnd
android:layout_marginLeft
android:layout_marginRight
android:layout_marginStart
android:layout_marginTop

　　和android.view.ViewGroup.LayoutParams

Attribute Name Related Method Description
android:layout_height   Specifies the basic height of the view. 
android:layout_width   Specifies the basic width of the view. 

　　以上所有属性就是布局控件提供的布局属性

　　所以，TextView可以设置的属性即为自身属性和以上的布局属性。

后记

　　以上我们通过LinearLayout和TextView的组合分析了Android中布局的属性使用情况，通过以上的分析使得我们能够了解到控件属性的由来，这样就可以更加随心所欲的进行界面布局了。

　　同样的道理，可以去分析RelativeLayout、TableLayout等等。

　　

　　原文地址：http://www.cnblogs.com/luoaz/p/3947100.html

　　

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