This will result in an image of equal quality but which requires less ForĮxample, a true-color PNG that does not require more than 256 colors may be converted to an 8-bit Image compression by the aapt tool during the build process. Note: Bitmap files may be automatically optimized with lossless
You can reference a bitmap file directly, using the filename as the resource ID, or create an png (preferred), ,webp (preferred, requires API level 17 or higher). Android supports bitmap files in the following formats: For example, when creating a state listĭrawable, you can reference a color resource for the android:drawable attribute ( BitmapĪ bitmap image. Creates a ScaleDrawable Shape Drawable An XML file that defines a geometric shape, including colors and gradients.Īlso see the Animation Resource document for how to Scale Drawable An XML file that defines a drawable that changes the size of another Drawable based on itsĬurrent level value. Clip Drawable An XML file that defines a drawable that clips another Drawable based on this Drawable'sĬurrent level value. This is useful when a View needs a background drawable that is smaller than the View's actualīounds.
Inset Drawable An XML file that defines a drawable that insets another drawable by a specified distance. Transition Drawable An XML file that defines a drawable that can cross-fade between two drawable resources.Ĭreates a TransitionDrawable. Level List An XML file that defines a drawable that manages a number of alternate Drawables, eachĪssigned a maximum numerical value. State List An XML file that references different bitmap graphicsįor different states (for example, to use a different image when a button is pressed).Ĭreates a StateListDrawable. These are drawn in array order, so theĮlement with the largest index is be drawn on top.
Layer List A Drawable that manages an array of other Drawables.
Nine-Patch File A PNG file with stretchable regions to allow image resizing based on content (. There are several different types of drawables: Bitmap File A bitmap graphic file (. To another XML resource with attributes such as android:drawable and android:icon. You can retrieve with APIs such as getDrawable(int) or apply A drawable resource is a general concept for a graphic that can be drawn to the screen and which
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