Question

我想在空白画布上画圆圈，但不知道怎么做。这是我用来在我的自定义ImageView类中创建Empty canvas的代码。

bmpBase = Bitmap.createBitmap(image_width, image_height, Bitmap.Config.ARGB_8888);
canvas = new Canvas(bmpBase);
Paint paint = new Paint();
paint.setColor(Color.BLUE);
canvas.drawCircle(100, 100, 30, paint);

Answer 1

试试这个，在你的MainActivity中首先找到你的imageView然后：

                drawingImageView = (ImageView)findViewById(R.id.DrawingImageView);
                Paint paint = new Paint();
                paint.setColor(Color.BLUE));
                paint.setStyle(Paint.Style.STROKE);
                paint.setStrokeWidth(15);    
                bmpBase = Bitmap.createBitmap(image_width, image_height, Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(bitmap);
                canvas.drawCircle(100, 100, 30, paint);
                drawingImageView.setImageBitmap(bitmap);

Answer 2

试试这个：

如果您只想要一个没有填充的轮廓，则需要将“绘画”样式设置为笔划：

Paint p = new Paint();
p.setStyle(Paint.Style.STROKE);

如果你想要填充圆圈，那么：

Paint p = new Paint();
p.setStyle(Paint.Style.FILL);

或者您可以参考： http://android-coding.blogspot.in/2012/04/draw-circle-on-canvas-canvasdrawcirclet.html

如何在空画布上画圆圈？

2 个答案: