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POHow to implement expandable panels in Android?
 

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  1. POHow to implement expandable panels in Android?
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    <p>Is there an easy way to create expandable/collapsible blocks like seen in official market app?</p> <p>Screenshot of Market app, when you click on "More" button, the description section expands with animation:</p> <p><img src="https://i.stack.imgur.com/0hqno.jpg" alt="enter image description here"></p> <p>I know of <a href="http://developer.android.com/reference/android/widget/SlidingDrawer.html" rel="noreferrer">SlidingDrawer</a> 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.</p> <p><strong>Update:</strong></p> <p>Here's my half-working solution. It's a custom widget that extends <code>LinearLayout</code>. It kind-of works, but doesn't handle edge cases well, like content height smaller than <code>collapsedHeight</code> 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:</p> <pre><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 content should be in "collapsed" state mCollapsedHeight = (int) a.getDimension( R.styleable.ExpandablePanel_collapsedHeight, 0.0f); int handleId = a.getResourceId(R.styleable.ExpandablePanel_handle, 0); if (handleId == 0) { throw new IllegalArgumentException( "The handle attribute is required and must refer " + "to a valid child."); } int contentId = a.getResourceId(R.styleable.ExpandablePanel_content, 0); if (contentId == 0) { throw new IllegalArgumentException( "The content attribute is required and must refer " + "to a valid child."); } mHandleId = handleId; mContentId = contentId; a.recycle(); } @Override protected void onFinishInflate() { super.onFinishInflate(); mHandle = findViewById(mHandleId); if (mHandle == null) { throw new IllegalArgumentException( "The handle attribute is must refer to an" + " existing child."); } mContent = findViewById(mContentId); if (mContent == null) { throw new IllegalArgumentException( "The content attribute is must refer to an" + " existing child."); } mHandle.setOnClickListener(new PanelToggler()); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (mContentHeight == 0) { // First, measure how high content wants to be mContent.measure(widthMeasureSpec, MeasureSpec.UNSPECIFIED); mContentHeight = mContent.getMeasuredHeight(); } // Then let the usual thing happen super.onMeasure(widthMeasureSpec, heightMeasureSpec); } private class PanelToggler implements OnClickListener { public void onClick(View v) { Animation a; if (mExpanded) { a = new ExpandAnimation(mContentHeight, mCollapsedHeight); } else { a = new ExpandAnimation(mCollapsedHeight, mContentHeight); } a.setDuration(500); mContent.startAnimation(a); mExpanded = !mExpanded; } } private class ExpandAnimation extends Animation { private final int mStartHeight; private final int mDeltaHeight; public ExpandAnimation(int startHeight, int endHeight) { mStartHeight = startHeight; mDeltaHeight = endHeight - startHeight; } @Override protected void applyTransformation(float interpolatedTime, Transformation t) { android.view.ViewGroup.LayoutParams lp = mContent.getLayoutParams(); lp.height = (int) (mStartHeight + mDeltaHeight * interpolatedTime); mContent.setLayoutParams(lp); } @Override public boolean willChangeBounds() { // TODO Auto-generated method stub return true; } } } </code></pre> <p>Here's <code>res/values/attrs.xml</code>:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;resources&gt; &lt;declare-styleable name="ExpandablePanel"&gt; &lt;attr name="handle" format="reference" /&gt; &lt;attr name="content" format="reference" /&gt; &lt;attr name="collapsedHeight" format="dimension" /&gt; &lt;/declare-styleable&gt; &lt;/resources&gt; </code></pre> <p>And here's how I use it in layout:</p> <pre><code>&lt;com.example.androidapp.widgets.ExpandablePanel android:orientation="vertical" android:layout_height="wrap_content" android:layout_width="fill_parent" example:handle="@+id/expand" example:content="@+id/value" example:collapsedHeight="50dip"&gt; &lt;TextView android:id="@id/value" android:layout_width="fill_parent" android:layout_height="wrap_content" android:maxHeight="50dip" /&gt; &lt;Button android:id="@id/expand" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="More" /&gt; &lt;/com.example.androidapp.widgets.ExpandablePanel&gt; </code></pre>
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    1. COCheck out http://stackoverflow.com/questions/3695856/android-slidingdrawer-from-top - the accepted answer has some 3rd party library that may be of interest. http://code.google.com/p/android-misc-widgets/source/browse/trunk/android-misc-widgets/src/org/miscwidgets/widget/Panel.java this one in particular.
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