CODEWITHSUNDEEP
android
Wouter Vandenputte
Wouter Vandenputte

Reputation: 2093

Android custom view get width once

I have a custom view in an Android project and in that custom view, I want to draw a bitmap that's about 1/3th the size of the view element.

I use the following code

Bitmap bigIcon = BitmapFactory.decodeResource(context.getResources(), R.drawable.icon);
Bitmap icon =   Bitmap.createScaledBitmap(bigIcon, newWidth, newHeight, false);

width newWidth and newHeight being 1/3th of the view's width and height.

The problem is now that if I want to get the view's width or height, I'd have to get it in the onMeasure or onDraw method. And I'd really prefer not to scale it every single frame (the bigIcon is loaded only once in the constructor). The createScaledBitmap needs also to be called only once but the constructor is too soon since the View is not yet created.

So the question: how can I access the view's width and height (knowing that the view's size doesn't change)?

Upvotes: 0

Views: 63

Answers (1)

Michael Krause
Michael Krause

Reputation: 4849

I think you can accomplish what you want by overriding your custom View's onSizeChanged method.

Here, you can calculate the dimensions of your bitmap based on the View's dimensions only when the size has actually changed.

Upvotes: 1

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