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POHow to make a selection border that tracks the checked radio button?
 

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  1. POHow to make a selection border that tracks the checked radio button?
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    <p>I have a set of <code>RadioButton</code>s with a custom style. I want to display a border around the button that is currently checked. This should be easy enough using XML, but now I want the border to be animated. If a new radio button is checked, the border should "fly" to its new location with a fancy animation:</p> <pre><code>+------+ |* btn1| o btn2 +------+ +------+ o b|n1 * |tn2 +------+ +------+ o btn1 |* btn2| +------+ </code></pre> <p>Because of this, I decided to make the border into a separate <code>View</code> object, so I can animate it properly. The trouble is in tracking the location of the corresponding radio button on the screen.</p> <p>I'm trying to get it to work <em>without</em> animations first. My current attempt looks something like this (only showing the relevant attributes):</p> <pre><code> &lt;RelativeLayout android:layout_alignParentLeft="true" android:layout_alignParentTop="true"&gt; &lt;RadioGroup android:id="@+id/radio_group"&gt; &lt;RadioButton/&gt; &lt;RadioButton/&gt; &lt;RadioButton/&gt; &lt;/RadioGroup&gt; &lt;View android:id="@+id/selection_border" android:layout_alignParentLeft="true" android:layout_alignParentTop="true"/&gt; &lt;/RelativeLayout&gt; </code></pre> <p>In the <code>OnCheckedChangeListener</code> of the <code>RadioGroup</code>, I move the selection border around by setting its margin (I could set the position, but that's a little harder with a <code>RelativeLayout</code>):</p> <pre><code>View radioButton = findViewById(checkedId); View selectionBorder = findViewById(R.id.selection_border); ViewGroup radioGroup = (ViewGroup)findViewById(R.id.radio_group); RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(selectionBorder.getLayoutParams()); params.leftMargin = radioGroup.getLeft() + radioButton.getLeft(); params.topMargin = radioGroup.getTop() + radioButton.getTop(); selection.setLayoutParams(params); selection.requestLayout(); </code></pre> <p>Trouble happens, however, on initialization. Because no layouting has been done yet, the position of the border is set incorrectly. It doesn't seem to be possible to force a relayout immediately, and it also doesn't seem to be possible to get an event after layouting has been done.</p> <p>All this hassle leads me to believe that there must be a cleaner way to accomplish what I want. Any bright ideas?</p>
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    1. COI think the hard part here is having a view animate to the bounds of another view. Looking forward to an answer.
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      1. USMatthew Willis
 

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