Monday, January 9, 2012

Android: Square View

In Monkey Write, the character sits in a square. Initially I just hard-coded the width to be equal to the height, but I wanted them to scale with the device dimensions. Today I found an elegant way to do it, with 3 lines of code in my custom View:

public void onMeasure(int widthSpec, int heightSpec) {
  super.onMeasure(widthSpec, heightSpec);
  int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
  setMeasuredDimension(size, size);

Since my class extends View, I can reuse all the measurement logic by calling super. After that, I take the measured width and height, find the smaller one, and use it to set the width to be the same as the height.

I made a sample project to test the SquareView. It is set to take one third of the screen width, and the easiest way to try it with different dimensions is to rotate the screen.

Source code:

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