我想创建一个空位图并将画布设置为该位图,然后在位图上绘制任何形状。
这可能比您想象的要简单:
int w = WIDTH_PX, h = HEIGHT_PX;
Bitmap.Config conf = Bitmap.Config.ARGB_8888; // see other conf types
Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
Canvas canvas = new Canvas(bmp);
// ready to draw on that bitmap through that canvas
以下是有关该主题的官方文档:Custom Drawing
不要使用 Bitmap.Config.ARGB_8888
而是使用 int w = WIDTH_PX, h = HEIGHT_PX;
Bitmap.Config conf = Bitmap.Config.ARGB_4444; // see other conf types
Bitmap bmp = Bitmap.createBitmap(w, h, conf); // this creates a MUTABLE bitmap
Canvas canvas = new Canvas(bmp);
// ready to draw on that bitmap through that canvas
在处理更多位图或大位图时,ARGB_8888 会使您陷入 OutOfMemory 问题。或者更好的是,尽量避免使用 ARGB 选项本身。