Android Layout Properties

There are many properties in the Android layout that summarize some of the common layout properties.

First two pictures:

1.

2.

In fact, many layout properties are composed of the words in the above two graphs:

(1) There are roughly three types of layout properties for Relativelayout:

First Class: property value is True or False

Android:layout_centerhrizontal Horizontal Center
Android:layout_centervertical Vertical Center
Android:layout_centerinparent is completely centered relative to the parent element

Android:layout_alignparentbottom snaps to the bottom edge of the parent element
Android:layout_alignparentleft snaps to the left edge of the parent element
Android:layout_alignparentright snaps to the right edge of the parent element
Android:layout_alignparenttop snaps to the top edge of the parent element

android:layout_alignwithparentifmissing if the corresponding sibling element cannot be found, then the parent element is the reference.

Second Class: the attribute value must be the reference name of the id "@id/idname"

Android:layout_below at the bottom of an element
Android:layout_above at the top of an element
Android:layout_toleftof on the left side of an element
Android:layout_torightof on the right side of an element

Android:layout_aligntop aligns the top edge of this element with the top edge of an element
Android:layout_alignleft aligns the left edge of this element with the left edge of an element
Android:layout_alignbottom aligns the bottom edge of this element with the bottom edge of an element
Android:layout_alignright aligns the right edge of this element with the right edge of an element

Class III: attribute values are specific pixel values, such as 100dip,100px

Android:layout_marginbottom distance from the bottom edge of an element
Android:layout_marginleft distance from the left edge of an element
Android:layout_marginright distance from the right edge of an element
Android:layout_margintop distance from the top edge of an element

(2) common attribute tags in linearlayout

android:orientation="vertical" for vertical alignment
android:orientation="Horizontal" indicates horizontal alignment
Android:layout_width="Fill_parent" defines the width of the current view on the screen, fill_parent fills the entire screen.

　　android:layout_height="wrap_content": Wraps the contents of the control. It's a bit automatic to set the width or height meaning.

Android:gravity= "Right" refers to the alignment of the child element of the element relative to it (e.g., the position of the text inside the TextView control relative to the TextView).
Android:layout_gravity= "Right" refers to the alignment of the element relative to its parent element (for example, the position of TextView relative to the parent control).

android:layout_weight= "0" weights, which are used to assign values to the importance of multiple controls in a linear layout, with a default value of zero.

　

Android Layout Properties