How to implement expandable panels in Android?

Is there an easy way to create expandable/collapsible blocks like seen in official market app?

Screenshot of Market app, when you click on "More" button, the description section expands with animation:

I know of SlidingDrawer but it doesn't seem to be suited for stuff like this--it's supposed to be put in overlay, and doesn't support half-open states.

Update:

Here's my half-working solution. It's a custom widget that extends LinearLayout. It kind-of works, but doesn't handle edge cases well, like content height smaller than collapsedHeight parameter. I'm sure with enough staring, digging in code and experimenting the quirks could be fixed. Was hoping to avoid doing that, and save some time by using a ready-made official or 3rd party solution. Anyway, here it is, code:

package com.example.androidapp.widgets;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.LinearLayout;

import com.example.androidapp.R;

public class ExpandablePanel extends LinearLayout {

    private final int mHandleId;
    private final int mContentId;

    private View mHandle;
    private View mContent;

    private boolean mExpanded = true;
    private int mCollapsedHeight = 0;
    private int mContentHeight = 0;

    public ExpandablePanel(Context context) {
        this(context, null);
    }

    public ExpandablePanel(Context context, AttributeSet attrs) {
        super(context, attrs);

        TypedArray a = context.obtainStyledAttributes(attrs,
            R.styleable.ExpandablePanel, 0, 0);

        // How high the cont