This Presentation will give u information about Android : 1. Graphics and Animations View Animation- Tween animation, 2. Frame Animation Drawable Animation- Nine-Patch File, 3. State List, 4. Transition Drawable

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Graphics & Animation
in Android

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Android rendering options
• The Canvas API
• Renderscript
• OpenGL wrappers
• NDK OpenGL

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The Canvas API
• Standard rendering for a typical SDK application that
uses View objects (standard and custom)
• consists of calls to each View's onDraw() method. This
method takes a single parameter, Canvas, which is the
object used by the view to draw its content.

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Renderscript
• Introduced in Android 3.0
• API targeted high-performance 3D rendering and
compute operations
• a 3D rendering API on top of hardware acceleration,
language C99
• executing native code on the device still cross-platform
• use of extensions that are placed into the application
package

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Open GL Wrappers
• OpenGL APIs at the SDK level
• not a recommended practice as a general approach for
complex scenes that require high-performance graphics
• difficult to achieve high performance levels equivalent to
native access to OpenGL due to the overhead of calling
down from the SDK
• Music application that shipped with Android 3.0 used this
approach

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NDK OpenGL
• no access to the View objects, or the events, or the rest
of the infrastructure that is provided in the SDK APIs
• graphics environment sufficient for some specific
purposes: game developers
• compiles applications to specific CPU architectures

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Animations
• Animations prior to Android 3.0
o android.view.animation
o move, scale, rotate, and fade Views
o combine multiple animations together in an AnimationSet
o specify animations in a LayoutAnimationController to get automatically staggered
animation
o use Interpolator implementations like AccelerateInterpolator and Bounce to get
natural, nonlinear timing behavior

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Animations
• Animations prior to Android 3.0
o you can animate Views... and that's it
o How to animate the position of a Drawable in a custom drawing? Or
translucency?
o you can move, rotate, scale, and fade a View... and that's it.
o animating the background color of a View?
o hard-coded set of things they were able to do, and you could not make them do
anything else.

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Animations
• Animator
o superclass for classes which provide basic support for animations which can be
started, ended, and have AnimatorListeners added to them
java.lang.Object
↳ android.animation.Animator
↳ android.animation.AnimatorSet
java.lang.Object
↳
android.animation.Animator
↳
android.animation.ValueAnimator
↳
android.animation.ObjectAnimator

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Animations
• AnimatorSet
o choreograph multiple animators together into a single animation
o animations can be set up to play together, in sequence, or after a specified delay
o “It is possible to set up a AnimatorSet with circular dependencies between its
animations… results of this configuration are undefined… circular dependencies
should be avoided”

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Animations
• ValueAnimator
o runs the internal timing loop that causes all of a process's animations to
calculate and set values
o two pieces to animating properties: calculating the animated values and setting
those values on the object and property in question. ValueAnimator takes care of
the first part; calculating the values

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Animations
ObjectAnimator.ofFloat(myObject, "alpha", 0f).start();
public void setAlpha(float value);
public float getAlpha();

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Animations
• View properties
o added new properties to the View class in Honeycomb
• translationX and translationY
• rotation, rotationX, and rotationY
• scaleX and scaleY
• pivotX and pivotY
• x and y
• alpha

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Animations
• AnimatorSet
o choreograph multiple animations
ObjectAnimator fadeOut = ObjectAnimator.ofFloat(v1,
"alpha", 0f);
ObjectAnimator mover = ObjectAnimator.ofFloat(v2,
"translationX", -500f, 0f);
ObjectAnimator fadeIn = ObjectAnimator.ofFloat(v2,
"alpha", 0f, 1f);
AnimatorSet animSet = new
AnimatorSet().play(mover).with(fadeIn).after(fadeOut);

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Animations
• TypeEvaluator
o The system knows how to animate float and int values, but otherwise it needs
some help knowing how to interpolate between the values you give it
o add this interface to the ValueEvaluator
Interface TypeEvaluator {
public abstract T evaluate (float fraction, T startValue, T
endValue)
}

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