Question

我正在制作一个屏幕，我需要我的gBall在屏幕中央对齐。代码如下。

  @Override
  protected void onDraw(Canvas canvas) {
    // TODO Auto-generated method stub
    super.onDraw(canvas);
    canvas.drawColor(Color.RED);

    Paint textPaint = new Paint();
    textPaint.setColor(Color.BLUE);
    textPaint.setTextAlign(Align.CENTER);
    textPaint.setTextSize(canvas.getWidth() / 7);
    textPaint.setTypeface(font);
    canvas.drawText("MY Text", (canvas.getWidth() / 2),
            (float) (canvas.getHeight() * 0.75), textPaint);
    canvas.drawBitmap(gball, 0, (float) (canvas.getHeight() * .25), null);//This is where i need help
}

但是我将它与屏幕左侧对齐，任何人都可以帮忙吗？

Answer 1

你得到它在屏幕的左边，因为你的X值设置为0.它应该是

   int startX= (canvas.getWidth()-gBall.getWidth())/2;//for horisontal position
   int startY=(canvas.getHeight()-gBall.getHeight())/2;//for vertical position
   canvas.drawBitmap(gball, startX, startY, null);

另外，不要在onDraw（）方法中初始化你的绘画。

Answer 2

使用此代码做对了！

  canvas.drawBitmap(gball, (canvas.getWidth()/2-(gball.getWidth()/2)), (float) (canvas.getHeight() * .25), null);

如何将画布对象与屏幕中心对齐？

2 个答案: