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    <p>Most flexible (and pretty easy) way to create custom animation is to extend <code>Animation</code> class.</p> <p>In general:</p> <ol> <li>Set duration of your animation using <code>setDuration()</code> method.</li> <li>Optionally set the interpolator for your animation using <code>setInterpolator()</code> (for exapmle you can use <code>LinearInterpolator</code> or <code>AccelerateInterpolator</code> etc.)</li> <li>Override <code>applyTransformation</code> method. Here we interested in <code>interpolatedTime</code> variable which changes between 0.0 and 1.0 and represent the your animation progress.</li> </ol> <p>Here is an example (I'm using this class to change ofsset of my <code>Bitmap</code>. <code>Bitmap</code> itself is drawn in <code>draw</code> method):</p> <pre><code>public class SlideAnimation extends Animation { private static final float SPEED = 0.5f; private float mStart; private float mEnd; public SlideAnimation(float fromX, float toX) { mStart = fromX; mEnd = toX; setInterpolator(new LinearInterpolator()); float duration = Math.abs(mEnd - mStart) / SPEED; setDuration((long) duration); } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { super.applyTransformation(interpolatedTime, t); float offset = (mEnd - mStart) * interpolatedTime + mStart; mOffset = (int) offset; postInvalidate(); } } </code></pre> <p>Also you can modify <code>View</code> by using <code>Transformation#getMatrix()</code>.</p> <p><strong>UPDATE</strong></p> <p>In case if you're using Android Animator framework (or compatibility implementation - <code>NineOldAndroids</code>) you can just declare setter and getter for your custom <code>View</code> property and animate it directly. Here is an another example:</p> <pre><code>public class MyView extends View { private int propertyName = 50; /* your code */ public int getPropertyName() { return propertyName; } public void setPropertyName(int propertyName) { this.propertyName = propertyName; } /* There is no need to declare method for your animation, you can, of course, freely do it outside of this class. I'm including code here just for simplicity of answer. */ public void animateProperty() { ObjectAnimator.ofInt(this, "propertyName", 123).start(); } } </code></pre>
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    1. COOne of these answers with the "Ahaaaa!" effect. Nice!
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