Hi all -
I'm trying to get a custom view example running out of the
"Professional Android Application Development" book (the
CompassView). I have checked over my code numerous times, and still
the same problem occurs...whenever I run the application I only see a
black screen and the view never pops up.
I have stepped through the debugger a few times and I have two
theories:
1. I have a problem with onMeasure()...my code is currently calling
setMeasuredDimension with 0,0
2. The view might be invisible...I read back the value of
CompassView.isShown() and it read false
Here is the measure code that is being used:
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// The compass is a circle that fills as much screen as
possible.
// Set the measured dimensions to the shortest screen boundary.
int measuredWidth = measure(widthMeasureSpec);
int measuredHeight = measure(heightMeasureSpec);
int d = Math.min(measuredWidth, measuredHeight);
//setMeasuredDimension must be called by onMeasure
setMeasuredDimension(d, d);
}
private int measure(int measureSpec){
int result = 0;
//Decode the spec value
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(specMode);
if(specMode == MeasureSpec.UNSPECIFIED){
//Return a default value
result = 200;
} else {
//Return full bounds since we are filling available
space
result = specSize;
}
measure() is returning MeasureSpec.EXACTLY for mode and 0 for size
from both width and height. How is that possible? I can attach more
code if necessary, because my other problem is that onDraw() never
gets called...but I thought that might have something to do with
having no size.
If it matters, I ran this under Android 1.1 and 1.5 to be sure I
didn't miss something in a version update.
Thanks in advance!
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