Bitmap图片等比例缩放

[android]代码库

canvas.save();
Matrix matrix = new Matrix();
int width = viewBg.getWidth();//获取资源位图的宽
int height = viewBg.getHeight();//获取资源位图的高
float w = scalX / viewBg.getWidth();
float h = scalY / viewBg.getHeight();
matrix.postScale(w, h);//获取缩放比例
Bitmap dstbmp = Bitmap.createBitmap(viewBg, 0, 0,
                                    width, height, matrix, true); //根据缩放比例获取新的位图
canvas.drawBitmap(dstbmp, 0, 0, mPaint); //在屏幕上画出位图
canvas.restore();