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PODifference between shape drawable and canvas.draw, workaround?
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  1. PODifference between shape drawable and canvas.draw, workaround?
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    copied!<p>I'm using two ways to display buttons and edit texts in my application : one is by using a xml shape drawable, and applying it to the background of a button/edittext, the other is by using a canvas in a custom view.</p> <p>I expect the result to be exactly the same, but it's not. You can see below the tiny difference between the respective strokes :</p> <p><img src="https://i.stack.imgur.com/z48WU.png" alt="enter image description here"></p> <p>Both are round rectanlges with a 2dp stroke width, and a 8dp corners radius. Here is the code for each of them :</p> <p>Left, the drawable shape used as a background :</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"&gt; &lt;solid android:color="@color/transparent"/&gt; &lt;corners android:radius="@dimen/button_cornersRadius"/&gt; &lt;stroke android:width="@dimen/button_strokeWidth" android:color="@color/blue_light"/&gt; &lt;/shape&gt; </code></pre> <p>Right, the onDraw method of the custom view :</p> <pre><code>protected void onDraw(Canvas canvas) { canvas.drawPath(drawingPath,strokePaint); canvas.drawText(text,demiWidth,textHeight,textPaint); } </code></pre> <p>Whith :</p> <pre><code> strokePaint = new Paint(Paint.ANTI_ALIAS_FLAG); strokePaint .setStyle(Paint.Style.STROKE); strokePaint .setStrokeWidth((int)(2*densityObtainedWithDisplayMetrics))); strokePaint .setColor(the exact same as above); </code></pre> <p>And I observe tiny differences when displaying gradients with the same supposedly equivalent ways : The shape drawable has a nicer display, the colors look better, the lines are not blurred.</p> <p>Could someone explain me why / how to work around it? If I was to use only one way, it would be the second, but I don't want to since it doesn't look clean. Thanks for any help!</p> <p>EDIT :</p> <p>Surprisingly, this difference occurs only when the stroke width of the custom layout is odd. With even values the display is exactly the same!</p>
 

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