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    <p>I see that this question became popular so I post my actual solution. The main advantage is that you don't have to know the expanded height to apply the animation and once the view is expanded, it adapts height if content changes. It works great for me.</p> <pre><code>public static void expand(final View v) { v.measure(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); final int targetHeight = v.getMeasuredHeight(); // Older versions of android (pre API 21) cancel animations for views with a height of 0. v.getLayoutParams().height = 1; v.setVisibility(View.VISIBLE); Animation a = new Animation() { @Override protected void applyTransformation(float interpolatedTime, Transformation t) { v.getLayoutParams().height = interpolatedTime == 1 ? LayoutParams.WRAP_CONTENT : (int)(targetHeight * interpolatedTime); v.requestLayout(); } @Override public boolean willChangeBounds() { return true; } }; // 1dp/ms a.setDuration((int)(targetHeight / v.getContext().getResources().getDisplayMetrics().density)); v.startAnimation(a); } public static void collapse(final View v) { final int initialHeight = v.getMeasuredHeight(); Animation a = new Animation() { @Override protected void applyTransformation(float interpolatedTime, Transformation t) { if(interpolatedTime == 1){ v.setVisibility(View.GONE); }else{ v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime); v.requestLayout(); } } @Override public boolean willChangeBounds() { return true; } }; // 1dp/ms a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density)); v.startAnimation(a); } </code></pre>
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    1. POAndroid: Expand/collapse animation
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    1. USTom Esterez
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    1. COv.measure(MeasureSpec.makeMeasureSpec(LayoutParams.MATCH_PARENT, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(LayoutParams.WRAP_CONTENT, MeasureSpec.EXACTLY)); In some cases(my - ListView) this mismatch leads to wrong targtetHeight value
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    2. CO@Tom Esterez This does work,but not very smoothly. Is there any additional work to make it smoothly?
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    3. CO@acntwww This is due to displaying all the child views each time. Hide all child views using View.GONE just before starting the animation and change back to VISIBLE once animation finishes (interpolatedTime == 1). This also gives you a nice fade-in effect.
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