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PODrawing LinearLayout with rounded corners
 

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    <p>I'm trying to implement a LinearLayout subclass that draws itself with rounded corners. From my research, I set <code>setWillNotDraw(false)</code> and overridden <code>onDraw()</code> to draw a rounded rectangle in the canvas:</p> <pre><code>@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); int sc = canvas.saveLayer(0, 0, getWidth(), getHeight(), drawPaint, Canvas.MATRIX_SAVE_FLAG | Canvas.CLIP_SAVE_FLAG | Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.FULL_COLOR_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); canvas.drawRoundRect(bounds, mCornerRadius, mCornerRadius, roundPaint); canvas.restoreToCount(sc); } </code></pre> <p>where:</p> <pre><code>drawPaint = new Paint(Paint.ANTI_ALIAS_FLAG); drawPaint.setColor(0xffffffff); drawPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN)); roundPaint = new Paint(Paint.ANTI_ALIAS_FLAG); roundPaint.setColor(0xffffffff); </code></pre> <p><code>DST_IN</code> seems the correct option here (according to the APIDemos example), but the area that should be transparent (the rounded one) has instead a black background, and the corners of the children are still visible. This is the result on a Galaxy Nexus with Android 4.2.2:</p> <p><img src="https://i.stack.imgur.com/V92Js.png" alt="example"></p> <p>Any hints?</p> <p>EDIT: Here is what I'd like to achieve, sorry for the crudeness of photoshopping :)</p> <p><img src="https://i.stack.imgur.com/cZfNv.png" alt="enter image description here"></p> <p>EDIT 2: I added to GitHub an example runnable project: <a href="https://github.com/venator85/RoundClippingLayout" rel="noreferrer">https://github.com/venator85/RoundClippingLayout</a></p> <p>Thanks ;)</p>
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    1. COhttp://stackoverflow.com/a/14534367/646806
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    2. COAlready tried, not working, since I'm not working with an ImageView but rather with a layout. I'm not even whether onDraw() rather than dispatchDraw(), or even both, is the correct method to override.
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    3. COThat algorithm will work. You just have to take the Bitmap returned and create a BitmapDrawable with it. Then set it to the background of your view.
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