Question

public class Player extends ViewGroup {
    private RectF rect = new RectF();
    private Paint paint;

    public Player(Context context,String pname) {
        super(context);
        setWillNotDraw(false);
        paint=new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setStyle(Style.FILL);
        paint.setColor(getResources().getColor(R.color.red));


    }

    public void onDraw(Canvas canvas) {
        canvas.drawRoundRect(rect, 10, 10, paint);
        canvas.drawCircle(rect.centerX(), rect.centerY(), 10, paint);
        //canvas.drawColor(Color.RED);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int wspec = MeasureSpec.makeMeasureSpec(
                getMeasuredWidth(), MeasureSpec.EXACTLY);
        int hspec = MeasureSpec.makeMeasureSpec(
                getMeasuredHeight(), MeasureSpec.EXACTLY);
        for(int i=0; i<getChildCount(); i++){
            View v = getChildAt(i);
            v.measure(wspec, hspec);
        }
    }


    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        rect.set(l, t,r, b);
    }
}

the third command does draw a red rectangle which bounds are the rect (l,t,r,b) = (412,415,735,754) which is given by the param rect, and for some reason, the two first commands do not do any effect on the canvas!

I have made sure the rect is an actual rectangle, as i mentioned its values were (412,415,735,754) which does make a valid rectangle, and you see how i defined the paint so why the hell wouldnt it draw?

been spending 2 hours trying to figure it out, seriously…

thanks!

BTW, the class extends ViewGroup cause it eventually meant to implement a view container..

Answer 1

Try this for your onLayout routine:

protected void onLayout(boolean changed, int l, int t, int r, int b) {
    rect.set(0, 0, r-l, b-t);
}

This way you will create a rect with the width and height of the full layout, but whose top left point (relative to the canvas) is 0, 0.