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Building Android UIs with Custom Views by Raimon Ràfols Montané

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Measuring our custom view

In the quick example we built in the previous chapter, we delegated all sizes and measurement to the parent view itself. To be honest, we haven't even delegated it; we just didn't do anything specifically to take care of that. Being able to control the size and dimensions of our custom view is something we definitely need to pay some attention to. To start, we're going to override the onMeasure() method from view as follows:

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
    super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
} 

Reading the Android documentation about the onMeasure() method, we should see we must call either setMeasuredDimension(int, int) or the superclass' onMeasure(int, ...

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