Android in SRC and background difference

The differences between the XML attributes src and background in ImageView:

The background is stretched according to the length and width given by the ImageView component, while SRC stores the size of the original. No stretching is done. SRC is the picture content (foreground), BG is the background and can be used at the same time.

Also: ScaleType only works on SRC. BG can set transparency. In ImageButton, for example, you can use Android:scaletype to control how images are scaled. The demo sample code is as follows:

<imageview android:id= "@+id/img"
android:src= "@drawable/logo"
Android:scaletype= "Centerinside"
Android:layout_width= "60dip"
android:layout_height= "60dip"
Android:layout_centervertical= "true"/>

Description: Centerinside to scale the picture proportionally. Causes the picture to be less than or equal to the corresponding dimension of the view.

Note: The picture you control is a resource, not a background, i.e. android:src= "@drawable/logo", not android:background= "@drawable/logo". The dynamic loading of pictures in the program is similar, for example: should be Imgview.setimageresource (r.drawable.*), rather than Imgview.setbackgroundresource (r.drawable.*);

Attached: More specific ScaleType Description:

Center/center displays the picture in the View center. And don't scale the picture

Center_crop/centercrop scale the picture so that the image is longer (wider) than equal to the corresponding dimension of the view

Center_inside/centerinside scale the picture so that the picture is less than or equal to the corresponding dimension of the view

Fit_center/fitcenter scale the picture to the smallest edge of the view. Center Display

Fit_end/fitend scale the picture to the smallest edge of the view, displayed in the lower part of the view

Fit_start/fitstart enlarge/Shrink the picture to the smallest edge of the view, displayed in the upper part of the view

Fit_xy/fitxy The picture is not scaled proportionally to the size of the view

Matrix/matrix Matrix Painting

Copyright notice: This article Bo Master original articles, blogs, without consent may not be reproduced.

Android in SRC and background difference