球体旋转Anim(主要学习点Matrix知识)

这点Code主要对View重写进行球体旋转:
知识点:
1.重写View
2.将Drawable资源转化为Bitmap

直接上代码(便于以后查看使用):

class MyView extends View {
		private Bitmap bitmap1;
		private Bitmap bitmap2;
		private int digree1 = 0;
		private int digree2 = 360;

		public MyView(Context context) {
			super(context);
			setBackgroundColor(Color.WHITE);
			InputStream is = getResources().openRawResource(R.drawable.cross);
			bitmap1 = BitmapFactory.decodeStream(is);
			is = getResources().openRawResource(R.drawable.ball);
			bitmap2 = BitmapFactory.decodeStream(is);
		}

		@Override
		protected void onDraw(Canvas canvas) {
			Matrix matrix = new Matrix();
			if (digree1 > 360)
				digree1 = 0;
			if (digree2 < 0)
				digree2 = 360;
			matrix.setRotate(digree1++, 160, 240);
			canvas.setMatrix(matrix);
			canvas.drawBitmap(bitmap1, 88, 169, null);
			matrix.setRotate(digree2--, 160, 240);
			canvas.setMatrix(matrix);
			canvas.drawBitmap(bitmap2, 35, 115, null);
			invalidate();
		}

	}