The relative layout of the Android layout relativelayout

First, relativelayout (relative layout) Overview

　　Relativelayout is a relative layout control that contains child controls that are arranged in a relative position between controls or as a subclass control relative to the position of the parent class container

Second, relativelayout (relative layout) properties

1. Attributes commonly used by subclass controls in Relativelayout (relative to one location of the parent container)

Android:layout_alignparentleft = "true" sub-class control relative to the current parent class container on the left (default)

Android:layout_alignparenttop = "true" sub-class control is relative to parent container on top

Android:layout_alignparentright= "true" sub-class control relative to parent container on the right side
Android:layout_alignparentbottom= "true" sub-class control relative to parent container bottom

Android:layout_margin= "20DP" subclass control distance from four sides of the parent class container

Android:layout_marginleft = "41DP" child control distance from the left side of the parent class container

Android:layout_margintop = "41DP" child control distance from top of parent container

Android:layout_marginbottom = "41DP" child control distance from the bottom of the parent class container

android:layout_marginleft = "41DP" child control distance from the left side of the parent class container

Android:layout_marginright = "41DP" sub-class control distance from the right edge of the parent class container

Android:layout_centerinparent = "true" sub-class control is centered horizontally relative to the parent container, which is vertically centered

Android:layout_centerhorizontal = "true" sub-class control is centered horizontally relative to the parent container

Android:layout_centervertical = "true" sub-class control is centered vertically relative to parent container

2. A sub-class control is positioned relative to a subclass control

Android:layout_below = "@+id/button1" The control is at the bottom of the given ID control

Android:layout_torightof = "@+id/button1" The control is on the right side of the given ID control

Android:layout_above = "@+id/button1" The control is above the given ID control

Android:layout_toleftof = "@+id/button1" The control is on the left side of the given ID control

Android:layout_alignbaseline = "@+id/button1" The contents of the control are on a line with the contents of the given ID control

Android:layout_alignbottom the bottom edge of the control is aligned with the bottom edge of the given ID control

Android:layout_alignleft the bottom edge of the control is aligned with the left edge of the given ID control

Android:layout_alignright the bottom edge of the control is aligned with the right edge of the given ID control

Android:layout_aligntop the bottom edge of the control is aligned with the top edge of the given ID control

Third , relativelayout (relative layout) Use example

　　　In the mall there is usually such a layout, a picture to the right of a few information

<Relativelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent" >    <ImageViewAndroid:id= "@+id/imageview1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignparentleft= "true"Android:layout_alignparenttop= "true"Android:layout_marginleft= "26DP"Android:layout_margintop= "26DP"android:src= "@drawable/ic_launcher" />    <TextViewAndroid:id= "@+id/textview1"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_aligntop= "@+id/imageview1"Android:layout_marginleft= "24DP"Android:layout_torightof= "@+id/imageview1"Android:text= "Dogs Ignore Buns" />    <TextViewAndroid:id= "@+id/textview2"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignleft= "@+id/textview1"Android:layout_below= "@+id/textview1"Android:text= "20 Yuan" />    <TextViewAndroid:id= "@+id/textview3"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:layout_alignbottom= "@+id/imageview1"Android:layout_alignleft= "@+id/textview2"Android:text= "expensive and not tasty" /></Relativelayout>

　　

The relative layout of the Android layout relativelayout