Question

In my xml I specified wrap_content for both the width and height but when I override the onMeasure function the width and height that are passed to it is -2147483348 which oddly is 300 > Integer.MIN_VALUE is there a reason for this? why is it not integer.MIN_VALUE or 0 if I didn’t have anything inside it. BTW this is a custom view that i’m making so I have to do setMeasuredDimension I believe.

Answer 1

The arguments to onMeasure are not the available width and height, but an encoding of the available width and height along with flags about how those values are supposed to be used. You decode them using the View.MeasureSpec class:

protected void onMeasure(int widthSpec, int heightSpec) {
    final int widthMode = MeasureSpec.getMode(widthSpec);
    final int widthSize = MeasureSpec.getSize(widthSpec);
    // etc.
}

The mode will be one of AT_MOST, EXACTLY, or UNSPECIFIED. See the docs for how you are supposed to use this. In particular, if the mode is not UNSPECIFIED you must not use a value greater than the size for that dimension when you call setMeasuredDimension.