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POProgrammatically creating scrollview(s) from custom component in android
 

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  1. POProgrammatically creating scrollview(s) from custom component in android
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    <p>I'm trying to build a compound control in Android, containing (among other things) a ScrollView. Things go wrong when I try to view the control in Eclipse, crashing with a NullPointerException after the error message: "Parser is not a BridgeXmlBlockParser".</p> <p>Stacktrace:</p> <pre><code>java.lang.NullPointerException at android.view.View.&lt;init&gt;(View.java:1720) at android.view.ViewGroup.&lt;init&gt;(ViewGroup.java:277) at android.widget.FrameLayout.&lt;init&gt;(FrameLayout.java:83) at android.widget.ScrollView.&lt;init&gt;(ScrollView.java:128) at android.widget.ScrollView.&lt;init&gt;(ScrollView.java:124) at android.widget.ScrollView.&lt;init&gt;(ScrollView.java:120) at my.compound.control.StringPicker.onMeasure(StringPicker.java:46) ... </code></pre> <p>I've traced the error to the following conditions:</p> <ul> <li>The NPE is thrown because a <code>Context.obtainStyledAttributes()</code> call returns <code>null</code> when the <code>attrs</code> argument passed is <code>null</code>.</li> <li>This only applies to the <code>BridgeContext</code> implementation used in Eclipse, which expects <code>attrs</code> to be an instance of the <code>BridgeXmlBlockParser</code>.</li> <li>The <code>attrs</code> argument is <code>null</code> because I create the ScrollView using the (Context) constructor.</li> </ul> <p>There is a workaround of course, which is passing the <code>attrs</code> I receive when Eclipse constructs the compound control, but I don't want all the attributes set on the compound control to apply to my inner control.</p> <p>Am I doing something wrong, is this a bug in Android Eclipse, ...?</p> <p>This is what my.compound.control.StringPicker.onMeasure looks like (stripped it a bit for clarity):</p> <pre><code>@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (this.getChildCount() != requestedLength) { this.removeAllViews(); int childWidth = getWidth() / requestedLength; int childHeight = getHeight(); for (int i = 0; i &lt; requestedLength; i++) { ScrollView child = new ScrollView(getContext()); // NPE here child.setLayoutParams(new LayoutParams(childWidth, childHeight)); addView(child); } } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } </code></pre>
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    1. COWould you show us how did you built it in my.compound.control.StringPicker.onMeasure ? Otherwise, we can't say what's wrong.
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    2. COI've added it, hope that helps :)
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    3. COWhich line is 46? And if you stripped things out, we may not be able to see what is wrong.
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      1. USCrackerJack9
 

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