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POViewAnimator's OnDraw throws NullPointerException if you remove child on onAnimationEnd
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  1. POViewAnimator's OnDraw throws NullPointerException if you remove child on onAnimationEnd
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    copied!<p>This is not a question, more like sharing with others a problem I encountered and how I resolved it. <br/> Basically, I was trying to create a ViewAnimator, who would create additional children in response to user clicks.<br/> To clean up after I have animated the next View in, I put</p> <pre><code>outAnimation.setAnimationListener(listener); </code></pre> <p>and in AnimationListener</p> <pre><code>public void onAnimationEnd(Animation animation) { viewAnimator.removeView(out); } </code></pre> <p>Now, the problem with above approach is, immediately after onAnimationEnd, it throws a NullPointerException. Basically, it means, ViewAnimator is still using child view that is being animated out to draw. Since I have removed it, there is null there. I have done my research, and basically, it appears this is a known bug. See: <a href="https://stackoverflow.com/questions/4750939/android-animation-is-not-finished-in-onanimationend">Android Animation is not finished on onAnimationEnd</a> <br> <br> To resolve this, I have modified layout.</p> <pre><code>&lt;ViewAnimator android:id="@+id/animator" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;FrameLayout android:id="@+id/container1" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;/FrameLayout&gt; &lt;FrameLayout android:id="@+id/container2" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;/FrameLayout&gt; &lt;/ViewAnimator&gt; </code></pre> <p>and onAnimationEnd I can safely call <code>container.removeAllViews()</code>. To animate a new view in, I select the hidden container and</p> <pre><code>container.addView(newView); animator.setDisplayedChild(animator.indexOfChild(container)); </code></pre> <p>I will be happy to see your comments and advice.</p>
 

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