Listing 1114 resanimanimatedxml

<?xml version="1.0" encoding="utf-8"?>

<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false">

<item android:drawable="@drawable/anddev1 <item android:drawable="@drawable/anddev2 <item android:drawable="@drawable/anddev3 </animation-list>

To display the frame-by-frame animation, set the animation to a view's background:

ImageView im = (ImageView) this.findViewByld(R.id.myanimated); im.setBackgroundResource(R.anim.animated);

AnimationDrawable ad = (AnimationDrawable)im.getBackground(); ad.start();

After the view background is set, a drawable can be retrieved by calling getBackground() and casting it to AnimationDrawable.Then, calling the start() method starts the animation.

Tween animation uses a different approach that creates an animation by performing a series of transformations on a single image. In Android, it provides access to the following classes that are the basis for all the animations:

■ AlphaAnimation—Controls transparency changes

■ RotateAnimation—Controls rotations

■ ScaleAnimation—Controls growing or shrinking

■ TranslateAnimation—Controls position changes

" android:duration="200" /> " android:duration="200" /> " android:duration="200" />

These four Animation classes can be used for transitions between activities, layouts, views and so on.All these can be defined in the layout XML file as <alpha>, <rotate>, <scale>, and <translate>.They all have to be contained within an AnimationSet <set>:

■ <alpha> attributes: android:fromAlpha, android:toAlpha

The alpha value translates the opacity from 0.0 (transparent) to 1.0 (opaque).

■ <rotate> attributes: android:fromDegrees, android:toDegrees, android:pivotX, android:pivotY

The rotate specifies the angle to rotate an animation around a center of rotation defined as the pivot.

■ <scale> attributes: android:fromXScale, android:toXScale, android:fromYScale, android:toYScale, android:pivotX, android:pivotY

The scale specifies how to change the size of a view in the x-axis or y-axis.The pivot location that stays fixed under the scaling can also be specified.

■ <translate> attributes: android:fromXDelta, android:toXDelta, android:fromYDelta, android:toYDelta

The translate specifies the amount of translation to perform on a View.

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