absolutelayout unique properties

AbsoluteLayout (absolute layout) is a layout method on the Android platform. Its characteristic is that the position of the control can be determined based on given coordinates. Compared with other layout methods (such as LinearLayout and RelativeLayout), AbsoluteLayout is more flexible in layout, but it is also more prone to layout chaos. Here, I will introduce some unique properties of AbsoluteLayout to help understand and use this layout method.

android:layout_x and android:layout_y:

These two properties are used to specify the x coordinate and y coordinate of the upper left corner of the control. For example, android:layout_x="100dp" android:layout_y="200dp" will place the upper left corner of the control at the (100dp, 200dp) position of the screen.

android:layout_width and android:layout_height:

These two properties are used to specify the width and height of the control. Width and height can be specified using specific values ​​(such as 100dp) or specific values ​​(such as fill_parent or wrap_content).

android:layout_alignParentTop, android:layout_alignParentBottom, android:layout_alignParentLeft and android:layout_alignParentRight:

These properties are used to position controls relative to the top, bottom, and left of the parent layout Align to the right. For example, android:layout_alignParentTop="true" will align the top of the control with the top of the parent layout.

android:layout_alignTop, android:layout_alignBottom, android:layout_alignLeft and android:layout_alignRight:

These properties are used to position controls relative to the top, bottom, and left of other controls Align to the right. For example, android:layout_alignTop="@ id/otherView" will align the top of the control with the top of the control with id otherView.

android:layout_centerHorizontal and android:layout_centerVertical:

These two properties are used to center-align the control horizontally and vertically. For example, android:layout_centerHorizontal="true" will center the widget horizontally.

android:layout_x and android:layout_y can be used together with the above alignment properties to fine-tune them by specifying positive and negative values. For example, android:layout_x="-10dp" will move the upper left corner of the control 10dp to the left.

Summary

The unique properties of AbsoluteLayout are mainly used to specify the position and alignment of the control. Using these properties can achieve flexible layout effects, but you also need to pay attention to the problems of overlap between controls and layout confusion. Since Android officially does not recommend using AbsoluteLayout, in actual development, it is recommended to use other layout methods to achieve a more stable and reliable interface layout.

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