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POAndroid - Is it possible to declare an alpha mask directly within layer-list XML definition?
 

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  1. POAndroid - Is it possible to declare an alpha mask directly within layer-list XML definition?
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    <p>A newbie question</p> <p>I have this layers.xml that I use as a source for an ImageView. And two images, mask.png and image.jpg</p> <p>layers.xml:</p> <pre><code>&lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;item&gt; &lt;bitmap android:src="@drawable/image" android:gravity="center"/&gt; &lt;/item&gt; &lt;item&gt; &lt;bitmap android:src="@drawable/mask" android:gravity="center"/&gt; &lt;/item&gt; &lt;/layer-list&gt; </code></pre> <p>ImageView:</p> <pre><code>&lt;ImageView android:id="@+id/img_B" android:layout_width="fill_parent" android:layout_height="fill_parent" android:src="@drawable/layers"/&gt; </code></pre> <p>At the moment the output is just the png over the image. I would like the png to act as a mask, clipping the image using the png alpha channel like so: <img src="https://i.stack.imgur.com/6MrKK.jpg" alt="enter image description here"></p> <p>Is that possible directly within the xml, or do I have to do it by code?</p> <p>Thanks for your advice ;)</p> <p>update: at the moment I achieved my goal using code to replace the entire ImageView</p> <pre><code>ImageView img = (ImageView) findViewById(imgID); Canvas canvas = new Canvas(); Bitmap mainImage = BitmapFactory.decodeResource(getResources(), R.drawable.img); Bitmap mask = BitmapFactory.decodeResource(getResources(), R.drawable.mask); Bitmap result = Bitmap.createBitmap(mainImage.getWidth(), mainImage.getHeight(), Bitmap.Config.ARGB_8888); canvas.setBitmap(result); Paint paint = new Paint(); paint.setFilterBitmap(false); canvas.drawBitmap(mainImage, 0, 0, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); canvas.drawBitmap(mask, 0, 0, paint); paint.setXfermode(null); img.setImageBitmap(result); img.invalidate(); </code></pre>
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    1. COthat was a nice way to point me here! Not sure of this, but let me look around a bit and get back to you.
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    2. COYou have to put this as an accepted answer because this just saved me!
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