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POError parsing XML: unbound prefix on custom LinearLayout
 

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    <p>I found this example of Custom LinearLayout on <a href="https://stackoverflow.com/questions/5165682/how-to-implement-expandable-panels-in-android">stackoverflow</a> but it throws errors when i try to run it, can someone find what's wrong with it?</p> <p><strong>Custom LinearLayout:</strong></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; 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 { @Override 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><strong>res > values > attrs.xml</strong></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><strong>main.xml:</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:cl="http://schemas.android.com/apk/lib/com.example.androidapp.widgets" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;com.example.androidapp.widgets.ExpandablePanel android:orientation="vertical" android:layout_height="wrap_content" android:layout_width="fill_parent" cl:handle="@+id/expand" cl:content="@+id/value" cl: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; &lt;/LinearLayout&gt; </code></pre> <p><strong>Activity class:</strong></p> <pre><code>package com.example.androidapp.widgets; import android.app.Activity; import android.os.Bundle; public class GoodPanelsActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } </code></pre> <p>LogCat error:</p> <blockquote> <p>FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.androidapp.widgets/com.example.androidapp.widgets.GoodPanelsActivity}: android.view.InflateException: Binary XML file line #9: Error inflating class com.example.androidapp.widgets.ExpandablePanel</p> </blockquote> <p><strong>EDIT: more from LogCat</strong></p> <blockquote> <p>java.lang.reflect.InvocationTargetException at java.lang.reflect.Constructor.constructNative(Native Method) at java.lang.reflect.Constructor.newInstance(Constructor.java:415) at android.view.LayoutInflater.createView(LayoutInflater.java:505) Caused by: java.lang.IllegalArgumentException: The handle attribute is required and must refer to a valid child. at com.example.androidapp.widgets.ExpandablePanel.(ExpandablePanel.java:39)</p> </blockquote>
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