常见Layout的LayoutParams总结
LayoutParams
java.lang.Object
<-- android.view.ViewGroup.LayoutParams
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android:layout_height???????
Specifies the basic height of the view.?
android:layout_width????????
Specifies the basic width of the view.
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MarginLayoutParams
java.lang.Object
<-- android.view.ViewGroup.LayoutParams
<-- android.view.ViewGroup.MarginLayoutParams
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android:layout_marginBottom???????
Specifies extra space on the bottom side 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_marginTop?????????????
Specifies extra space on the top side of this view.
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FrameLayout
java.lang.Object
<-- android.view.ViewGroup.LayoutParams
<-- android.view.ViewGroup.MarginLayoutParams
<-- android.widget.FrameLayout.LayoutParams
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android:layout_gravity???????????
Standard gravity constant that a child can supply to its parent
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LinearLayout
java.lang.Object
<-- android.view.ViewGroup.LayoutParams
<-- android.view.ViewGroup.MarginLayoutParams
<-- android.widget.LinearLayout.LayoutParams
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android:layout_gravity?????????
Standard gravity constant that a child can supply to its parent
android:layout_weight???????????
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RelativeLayout
java.lang.Object
<-- android.view.ViewGroup.LayoutParams
<-- android.view.ViewGroup.MarginLayoutParams
<-- android.widget.RelativeLayout.LayoutParams
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android:layout_above???????????????????????????
Positions the bottom edge of this view above the given anchor view ID.
android:layout_alignBaseline????????????????
Positions the baseline of this view on the baseline of the given anchor view ID.
android:layout_alignBottom??????????????????
Makes the bottom edge of this view match the bottom edge of the given anchor view ID.
android:layout_alignLeft???????????????????????
Makes the left edge of this view match the left edge of the given anchor view ID.
android:layout_alignParentBottom?????????
If true, makes the bottom edge of this view match the bottom edge of the parent.
android:layout_alignParentLeft??????????????
If true, makes the left edge of this view match the left edge of the parent.
android:layout_alignParentRight????????????
If true, makes the right edge of this view match the right edge of the parent.
android:layout_alignParentTop??????????????
If true, makes the top edge of this view match the top edge of the parent.
android:layout_alignRight??????????????????????
Makes the right edge of this view match the right edge of the given anchor view ID.
android:layout_alignTop????????????????????????
Makes the top edge of this view match the top edge of the given anchor view ID.
android:layout_alignWithParentIfMissing?????
If set to true, the parent will be used as the anchor when the anchor cannot be be found for layout_toLeftOf, layout_toRightOf, etc.
android:layout_below???????????????????????????
Positions the top edge of this view below the given anchor view ID.
android:layout_centerHorizontal??????????
If true, centers this child horizontally within its parent.
android:layout_centerInParent?????????????
If true, centers this child horizontally and vertically within its parent.
android:layout_centerVertical??????????????
If true, centers this child vertically within its parent.
android:layout_toLeftOf????????????????????????
Positions the right edge of this view to the left of the given anchor view ID.
android:layout_toRightOf?????????????????????
Positions the left edge of this view to the right of the given anchor view ID.
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TableLayout
java.lang.Object
<-- android.view.ViewGroup.LayoutParams
<-- android.view.ViewGroup.MarginLayoutParams
<-- android.widget.LinearLayout.LayoutParams
<-- android.widget.TableLayout.LayoutParams
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AbsoluteLayout
java.lang.Object
<-- android.view.ViewGroup.LayoutParams
<-- android.widget.AbsoluteLayout.LayoutParams
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java.lang.Object?
<-- android.R.styleable
<-- public static final int[] AbsoluteLayout_Layout
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android:layout_x
android:layout_y
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Note: AbsoluteLayout is deprecated. Use other layouts instead.
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总结
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1. 界面的原点(0, 0)是除去status bar和title bar之后剩下的区域。如果使用了全屏，不显示状态栏，不显示标题栏这样的主题后，区域的原点位置会相应改变。
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2. FrameLayout的widget中使用类似android:layout_marginLeft="65px"这样的属性，一定要加上android:layout_gravity，否则margin无效。还要注意FrameLayout的android:layout_width和android:layout_height对layout_gravity的影响。
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3. 使用布局属性一定要分清谁是parent，parent用的是什么layout，layout_width和layout_height的值。
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4. 不同的布局属性也可以实现相同的功能。例如layout_gravity="center"和android:layout_centerInParent?="true"。
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5. Eclipse的Android开发工具插件ADT里面有一个所见即所得的开发UI的功能。利用Graphical Layout可以预览的效果。但是，有时会遇到以下问题：
error!
UnsupportedOperationException: null
一般来说，这是因为所选择的Android版本不支持布局设置或者Android SDK不能很好的支持该layout的显示。可以尝试换其他Android版本或者看看该版本的SDK有没有更新。
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