Is it possible to mask a View in android?

Question

Is it possible to mask views? For example, if I have a design that calls for a List View to be visible within an oval shaped opening. Is there a way to create a mask for a view? Is it called something else? Because all the references I find to masking in the android docs are talking about masking a canvas object or drawable. But I don't think making a drawable of an interactive object like a list View would be a good approach. Is this just a limitation to deal with for now?

Answer 1

Yes, it is - you have to override the drawing method of your view - i.e:

...... final Path path = new Path(); path.addRoundRect(new RectF(0,0,getWidth(),getHeight()),10,10,Direction.CW); ...... @Override protected void dispatchDraw(Canvas canvas){     canvas.clipPath(path);     super.dispatchDraw(canvas); } 

this will draw your view only in the boundaries set by path.

Answer 2

Yes, you can even mask complete layouts. Shameless selfplug

<com.christophesmet.android.views.maskableframelayout.MaskableFrameLayout android:id="@+id/frm_mask_animated" android:layout_width="100dp" app:porterduffxfermode="DST_IN" app:mask="@drawable/animation_mask" android:layout_height="100dp">  <ImageView android:layout_width="match_parent"            android:layout_height="match_parent"            android:scaleType="centerCrop"            android:src="@drawable/unicorn"/> 

You can find it here