Android:ViewAnimation

lastmod 2018-08-17created 2016-05-141 edits

Using Animation resources

In Android, animations are also registered as resources. They are stored as XML-format documents under the project folder \res\anim\, and Java accesses compiled animation resources with AnimationUtil:loadAnimation(context, int). ¹

The main XML Elements and Attributes used in the XML document are as follows.

• <translate>
  • Specifies an up/down/left/right movement animation. Corresponds to the TranslateAnimation class.
  • With the following 4 xml attributes
    • android:fromXDelta: X coordinate where the animation starts
    • android:toXDelta: X coordinate where it ends
    • android:fromYDelta: Starting Y location.
    • android:toYDelta: Ending Y location.
  • Uses one of the following 3 kinds of values (value).
    • -100% ~ 100%: Ratio of the position relative to itself. 0% is its current position.
    • -100%p ~ 100%p: Ratio of the position relative to the parent container. 0%p is its current position.
    • float value: Indicates an absolute position.
• <alpha>
  • Adjusts transparency. Corresponds to the AlphaAnimation class.
  • With the following xml attributes
    • android:fromAlpha: Transparency when the animation starts
    • android:toAlpha: Transparency when the animation finishes
  • Set with the following values.
    • 0.0 ~ 1.0 (0.0 is transparent, 1.0 is fully opaque)

In addition, the attribute shared by both elements above (translate, alpha) that sets how long the animation lasts is as follows.

• android:duration: Sets the time from when the Animnation starts until it ends, in milliseconds (1/1000 second).

Favorite site

• Android View Animation
• How to make an animation that moves an image

References