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POAndroid TransitionDrawable with multiple items
 

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  1. POAndroid TransitionDrawable with multiple items
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    <p>I want to create a Button in Android with a text, and a background image. The background image should crossfade every X time.</p> <p>I have this working using a TransitionDrawable with 2 images.</p> <p>But I can't get this to work with more than 2 images.</p> <p>What I have :</p> <p>In Java code I create a Button and set a background (which is a TransitionDrawable defined in XML). And I start the transition.</p> <pre><code>final Button b = new Button(getApplicationContext()); b.setTextColor(getResources().getColor(R.color.white)); b.setText("Some text"); b.setBackgroundDrawable(getResources().getDrawable(R.drawable.tile)); StateListDrawable background = (StateListDrawable) b.getBackground(); TransitionDrawable td = (TransitionDrawable) background.getCurrent(); td.startTransition(2000); </code></pre> <p>In XML I define in tile.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;item android:state_pressed="true" &gt; &lt;shape&gt; &lt;solid android:color="#449def" /&gt; &lt;/shape&gt; &lt;/item&gt; &lt;item android:drawable="@drawable/transition"&gt; &lt;shape&gt; &lt;solid android:color="#0000ff" /&gt; &lt;/shape&gt; &lt;/item&gt; &lt;/selector&gt; </code></pre> <p>And finally a transition.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;transition xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false"&gt; &lt;item android:drawable="@drawable/desert"/&gt; &lt;item android:drawable="@drawable/hydrangeas" /&gt; &lt;item android:drawable="@drawable/jellyfish" /&gt; &lt;/transition&gt; </code></pre> <p>Now the effect is that when I start the app the desert image is shown. This image crossfades to the hydrangeas image as it should. But the jellyfish image is never shown.</p> <p>In the doc for TransitionDrawables it is stated that you can specify more than 2 drawables but I can't get this to work.</p> <p>I also tried this without any XML but in pure JAVA but this gave exactly the same problem :-(</p>
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    1. CO*In the doc for TransitionDrawables it is stated that you can specify more than 2 drawables* - can you provide a link to where this is stated?
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    2. COhttp://developer.android.com/reference/android/graphics/drawable/TransitionDrawable.html#TransitionDrawable(android.graphics.drawable.Drawable[]) This states "At least 2 layers are required for this drawable to work properly.". As said in my original post I also tried everything in pure Java code (thus actaully using this constructor) but this had exactly the same problem.
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    3. COA bad choice for words. I've just looked at the code for `TransitionDrawable` and it only fades between two drawables, every other layer is ignored.
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