October 2017
Intermediate to advanced
294 pages
6h 49m
English
Content preview from Building Android UIs with Custom Views
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Optimizations and improvements with Paths
We could actually pre-calculate these operations we're doing on the onDraw() method as there is no need to do it every single time we're drawing the chart on the screen. We could just do it at the setDataPoints(), which is the only point in our custom view that our data set can be changed or replaced:
public void setDataPoints(float[] originalData) { dataPoints = new float[originalData.length]; float minValue = Float.MAX_VALUE; float maxValue = Float.MIN_VALUE; for (int i = 0; i < dataPoints.length; i++) { dataPoints[i] = originalData[i]; if (dataPoints[i] < minValue) minValue = dataPoints[i]; if (dataPoints[i] > maxValue) maxValue = dataPoints[i]; } float verticalDelta = maxValue - minValue; for ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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