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POHow do I eliminate the delay before an LayoutTransition animation
 

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  1. POHow do I eliminate the delay before an LayoutTransition animation
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    <p>I'm trying out the new <code>LayoutTransition</code> class in Honeycomb. I have set an animation that slides a <code>View</code> into place when adding it to a <code>ViewGroup</code>. I noticed that there is a slight delay (around 20ms) between when a view first renders and when the <code>LayoutTransition.APPEARING</code> animation begins. In other words, after the view appears on screen, it hangs in the air for a moment, and then starts to animate into place. You can notice this even in the <code>ApiDemos</code> sample project. In the layout animation examples, there's always a delay before a <code>ViewGroup</code>'s APPEARING animation starts. I've even tried setting the other <code>LayoutTransition</code> animations to null, or finally giving them very short durations, but still the <code>APPEARING</code> animation is delayed. Here's my code:</p> <pre><code>public class DebugExampleFour extends Activity { private int numButtons = 1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.debug_example_four); final ViewGroup frame = (ViewGroup) findViewById(R.id.frame_container); LayoutTransition transitioner = new LayoutTransition(); Animator appearingAnimation = ObjectAnimator.ofFloat(null, "translationX", 600, 0); appearingAnimation.setDuration(45); appearingAnimation.setStartDelay(0); appearingAnimation.setInterpolator(new DecelerateInterpolator()); appearingAnimation.addListener(new AnimatorListenerAdapter() { public void onAnimationEnd(Animator anim) { View view = (View) ((ObjectAnimator) anim).getTarget(); view.setTranslationX(0f); } }); transitioner.setAnimator(LayoutTransition.APPEARING, appearingAnimation); Animator dummyAnimation = ObjectAnimator.ofInt(0, 1); dummyAnimation.setDuration(1); dummyAnimation.setStartDelay(0); transitioner.setAnimator(LayoutTransition.CHANGE_APPEARING, dummyAnimation); transitioner.setAnimator(LayoutTransition.CHANGE_DISAPPEARING, dummyAnimation); transitioner.setAnimator(LayoutTransition.DISAPPEARING, dummyAnimation); frame.setLayoutTransition(transitioner); Button addButton = (Button) findViewById(R.id.addNewButton); addButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Button newButton = new Button(DebugExampleFour.this); newButton.setText("Click To Remove " + (numButtons++)); newButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { frame.removeView(v); } }); frame.addView(newButton, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); } }); } } </code></pre> <p>Here's the layout file that goes along with the example:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"&gt; &lt;Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Add Button" android:id="@+id/addNewButton" /&gt; &lt;LinearLayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/frame_container" android:animateLayoutChanges="true" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>How do I eliminate the delay before the <code>APPEARING</code> animation?</p>
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