Android--animation

Animations in Android:

Category: Tweenanimation (motion Tween) and frameanimation (frame animation).

1. Tweenanimation, it is a kind of gradual effect to produce animation effect by changing the image.

   Alphaanimation: transparency Gradient;

   Scaleanimation: Size scaling;

   Translateanimation: Mobile

   Rotateanimation: Rotate

2. Frameanimation: Sequential playback of pre-done images is a conversion animation;

Second, the attribute introduction:

1. Tweenanimation Common attributes:

Android:duration [Long]: the duration of the animation;

Android:fillafter [Boolean]: The view stops at the end of the animation, but the real position is still the given position in the layout;

Android:fillbefore[boolean]: The view stops at the beginning of the animation position;

Android:interpolator: Specifies an animated plug-in that is commonly used with the following inserts:

Accelerater_decelerate_interpolator: Acceleration-deceleration animation insert

Accelerater_interpolator: accelerating the animation insert;

Deceleratr_interpolator: deceleration animation insert;

Android:repeatcount[int]: Animation repetition, 1 means infinite loop;

Android:repeatmode[int]: Defines the behavior of the animation repetition, 1, starting from the starting point, 2, from the end position to start the opposite execution;

Android:startoffset[long]: The interval between animations and the next animation from the time the last animation was stopped;

Android:zadjustment[int]: Defines the change in Z order of the animation, 0: Keep z order unchanged, 1: Keep at the top;-1 keep at the bottom; Pending verification)

1.1 Alphaanimation

Defined in XML

<!--<alpha android:fromalpha= "" At the beginning of transparency, 0.0-1.0--><!--android:toalpha= "" At the end of the transparency 0.0-1.0--><!-- Android:duration= "" Animation duration/>--

The code defines:

Fromalpha: Transparency at the beginning, Toalpha: Transparency at the end alphaanimation alpha = new Alphaanimation (Fromalpha, Toalpha);// Sets the duration of the animation alpha.setduration (Durationmillis);

1.2 Scaleanimation

Xml

<!--<scale--><!--android:fromxscale= "" The scaling dimensions on the x-coordinate at the start of the animation--><!--android:toxscale= "" The x-coordinate at the end of the animation     Shrink size--><!--android:fromyscale= The scaling dimensions on the y-axis at the start of the animation--><!--android:toyscale= "" Stretch dimensions on the y-axis at the end of the animation--><!-- Android:pivotx= the start position of the animation relative to the object's x-coordinate--><!--android:pivoty= "" animation relative to the beginning of the object's y-coordinate--><!--/>-

In your code

Scaleanimation scale = new Scaleanimation (FromX, ToX, FromY, ToY);

1.3 translateanimation

Xml

<translate android:fromxdelta= "0%"//x axis start position android:pivotx= "0%"//animation relative to the beginning of object X coordinate android:pivoty= " 0% "//animation is relative to the start position of the object y-coordinate android:toxdelta=" 30% "//x axis end position android:fromydelta=" 0% "//y axis start position Android:toydel Ta= "0%"//y axis end position android:duration= "10000"/>

In the code:

Translateanimation anim = new Translateanimation (Fromxdelta, Toxdelta, Fromydelta, Toydelta)

1.4 Rotateanimation

Xml

<!--<rotate--<!--android:fromdegrees= "" Angle of the object at the start of the animation-<!--android:todegrees= "" The angle of the object rotation at the end of the animation -<!--angle is negative to rotate counterclockwise, the angle is positive to rotate clockwise--<!--android:pivotx= "" animation is relative to the start of object x coordinates--<!--android:p Ivoty= the start of the animation relative to the y-coordinate of the object-<!--android:duration= "" Animation run time/>

Code:

Scaleanimation anim = new Scaleanimation (FromX, ToX, FromY, ToY)

2.xml defines the use of animations in activity:

Animation Animation = (Animation) animationutils.loadanimation (Mainactivity.this, r.anim.animation);

3. Use of the Interpolator

Interpolator Object	Resource ID	Functional Role
Acceleratedecelerateinterpolator	@android: Anim/accelerate_decelerate_interpolator	Accelerate and decelerate first.
Accelerateinterpolator	@android: Anim/accelerate_interpolator	Accelerated
Anticipateinterpolator	@android: Anim/anticipate_interpolator	Take a small step back and speed it up.
Anticipateovershootinterpolator	@android: Anim/anticipate_overshoot_interpolator	A small step beyond the finish line on the last, and then back to the end.
Bounceinterpolator	@android: Anim/bounce_interpolator	Final stage Pinball effect
Cycleinterpolator	@android: Anim/cycle_interpolator	Periodic motion
Decelerateinterpolator	@android: Anim/decelerate_interpolator	Slowdown
Linearinterpolator	@android: Anim/linear_interpolator	Uniform
Overshootinterpolator	@android: Anim/overshoot_interpolator	Get to the finish line quickly and go beyond one step to the end

4.FrameAnimation: Frame animation

Add pictures and play them in the order of adding pictures;

Animationdrawable anima = new Animationdrawable () Anima.addframe (Drawable1, Duration1); Anima.addframe (Drawable2, Duration2); Anima.addframe (Drawable3, Duration3); Anima.addframe (Drawable4, Duration4); View.setbackgrouddrawable ( ANIMA);

Android--animation