The difference between SRC and background in Android

The background is stretched according to the length and width given by the ImageView component, while SRC stores the size of the original and does not stretch. SRC is the picture content (foreground), BG is the background and can be used simultaneously.

Also: ScaleType only works on SRC; BG can set the transparency, for example, in ImageButton, you can use Android:scaletype to control how the image is scaled, the 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 represents scaling the picture so that the picture is longer (wider) than 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 program dynamically loads the picture similarly, for example: should Imgview.setimageresource (r.drawable.*), but not Imgview.setbackgroundresource (r.drawable.*);

Attached: More detailed description of ScaleType:

Center/center display pictures in the center of the view and do not 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 image is longer (wider) than equal to the corresponding dimension of the view

Fit_center/fitcenter scale the picture to the smallest edge of the view, centered on the 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 using matrices to draw

The difference between SRC and background in Android