Android Bitmap Memory Usage Calculation formula

Android's definition of each resolution

How to calculate when a picture is stored in a format argb_8888

Memory consumption = picture length * Picture width/bytes

Picture length = picture original long (Device dpi/folder dpi) Picture width = Picture original width (device dpi/folder dpi)

Examples of validation are as follows:

Picture size 200 * 320, device is red meter dpi is 320, belongs to xhdpi device.

Verify that a picture is placed in hdpi and the following is the result of the code output:

Dd/mainactivity (13014): dpi:320 bitmap bytecount:456036

Picture length = (320/240) * 200 = 266.67

Picture width = (320/240) * 320 = 426.67

Memory consumption = 266.67 * 426.67 * 4 = 455116 approximately the same as the actual value

Verification two: Picture put xxhdpi, below for code output result:

D/mainactivity (13014): dpi:320    bitmap bytecount:113316

Picture length = (320/480) * 200 = 133.33

Picture width = (320/480) * 320 = 213.33

Memory consumption = 133.33 * 213.33 * 4 = 113774 is approximately the same as the actual value.

Android Bitmap Memory Usage Calculation formula