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    <p>I used the same technique as Andy here, and refined it so that it can be used for expanding and collapsing without glitches, also using a technique described here: <a href="https://stackoverflow.com/a/11426510/1317564">https://stackoverflow.com/a/11426510/1317564</a></p> <pre><code>import android.view.View; import android.view.ViewTreeObserver; import android.view.animation.ScaleAnimation; import android.view.animation.Transformation; import android.widget.LinearLayout; class LinearLayoutVerticalScaleAnimation extends ScaleAnimation { private final LinearLayout view; private final LinearLayout.LayoutParams layoutParams; private final float beginY; private final float endY; private final int originalBottomMargin; private int expandedHeight; private boolean marginsInitialized = false; private int marginBottomBegin; private int marginBottomEnd; private ViewTreeObserver.OnPreDrawListener preDrawListener; LinearLayoutVerticalScaleAnimation(float beginY, float endY, LinearLayout linearLayout) { super(1f, 1f, beginY, endY); this.view = linearLayout; this.layoutParams = (LinearLayout.LayoutParams) linearLayout.getLayoutParams(); this.beginY = beginY; this.endY = endY; this.originalBottomMargin = layoutParams.bottomMargin; if (view.getHeight() != 0) { expandedHeight = view.getHeight(); initializeMargins(); } } private void initializeMargins() { final int beginHeight = (int) (expandedHeight * beginY); final int endHeight = (int) (expandedHeight * endY); marginBottomBegin = beginHeight + originalBottomMargin - expandedHeight; marginBottomEnd = endHeight + originalBottomMargin - expandedHeight; marginsInitialized = true; } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { super.applyTransformation(interpolatedTime, t); if (!marginsInitialized &amp;&amp; preDrawListener == null) { // To avoid glitches, don't draw until we've initialized everything. preDrawListener = new ViewTreeObserver.OnPreDrawListener() { @Override public boolean onPreDraw() { if (view.getHeight() != 0) { expandedHeight = view.getHeight(); initializeMargins(); adjustViewBounds(0f); view.getViewTreeObserver().removeOnPreDrawListener(this); } return false; } }; view.getViewTreeObserver().addOnPreDrawListener(preDrawListener); } if (interpolatedTime &lt; 1.0f &amp;&amp; view.getVisibility() != View.VISIBLE) { view.setVisibility(View.VISIBLE); } if (marginsInitialized) { if (interpolatedTime &lt; 1.0f) { adjustViewBounds(interpolatedTime); } else if (endY &lt;= 0f &amp;&amp; view.getVisibility() != View.GONE) { view.setVisibility(View.GONE); } } } private void adjustViewBounds(float interpolatedTime) { layoutParams.bottomMargin = marginBottomBegin + (int) ((marginBottomEnd - marginBottomBegin) * interpolatedTime); view.getParent().requestLayout(); } } </code></pre>
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    1. COIs it possible to use this to first collapse an existing LinearLayout and then expand the same LinearLayout again afterwards? When I try to do this, it just collapses and won't expand again (probably because the height of the view is now 0 or something like that).
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    2. COI found that it works more reliably when the linear layout contains more than one view. If it contains only one view, then it won't always expand.
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