Question

Please bear with me if this isn’t clear, this is my first posting here.

I’m drawing a couple of lines on a canvas and trying to translate the canvas to centre the lines on the screen. The trouble is, I have an actionbar (using actionbarsherlock) which I want to exclude from the translation i.e. I want the top of the view to be under the action bar.

As it is, the data is centred vertically on the whole screen height, but I want it to be centred vertically only on the visible part of the canvas under the action bar.

Any ideas of the best way to achieve this?

@Override
protected void onDraw(Canvas canvas) {
    Paint paint = mPaint;

    paint.setAntiAlias(true);
    paint.setColor(Color.WHITE);
    paint.setStyle(Paint.Style.FILL);


    int centrew = canvas.getWidth()/2;
    int centreh = canvas.getHeight()/2;

    canvas.translate(centrew, centreh);
    canvas.drawLine(0, -5, 0, 5, mPaint);
    canvas.drawLine(5, 0, -5, 0, mPaint);

}

Answer 1

The solution I used was as described here :

http://developer.android.com/resources/samples/HoneycombGallery/src/com/example/android/hcgallery/TitlesFragment.html

Basically my activity has the following layout listener defined:

ViewTreeObserver.OnGlobalLayoutListener layoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        mmv.setAbShift(MunroBag.this.actionBar.getHeight());
    }
};  

Then the view class has the following method defined:

    public void setAbShift(int shift)
    {
        abShift = shift;
        this.invalidate();
    }

So onDraw gets called and the shift is applied to the view depending on the actionBar height.