java Android画布。drawCircle（）错误。持续绘制椭圆而不是圆

Question

我尝试在Canvas的帮助下，使用drawCircle（…）方法创建一个圆。但最终为什么我得到的是椭圆而不是圆呢？我怎样才能得到“真实”的圆圈

Bitmap bitmap = Bitmap.createBitmap((int) (widthView), heightView, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
  Paint paint = new Paint();
  paint.setColor(Color.parseColor("#FF950000"));
  paint.setAntiAlias(true);
  paint.setStyle(Style.FILL);
  canvas.drawRect(0.0f, 0.0f, widthView, heightLevel, paint);
  paint.setColor(Color.parseColor("#FFD4A503"));
  canvas.drawRect(0.0f, heightLevel, widthView, 2 * heightLevel, paint);
  paint.setColor(Color.parseColor("#FF4A7816"));
  canvas.drawRect(0.0f, 2 * heightLevel, widthView, 3 * heightLevel,
    paint);
  paint.setColor(Color.parseColor("#FFFFFFFF"));
  canvas.drawCircle(30 * density, getLevelHeight(1), 20f, paint);  graphicView.setBackgroundDrawable(new BitmapDrawable(getResources(),
    bitmap));

结果：

Nexus 4

华为G500Pro（Shine）

Answer 1

你应该用setImageBitmap(Bitmap)代替setBackgroundDrawable()

此外，setBackgroundDrawable()已被弃用