【原创】Android 图像Y轴对称

      核心方法：

public Bitmap rotate(Bitmap b, int degrees){if(degrees != 0 && b != null){Matrix m = new Matrix();m.postScale(1, -1);m.setRotate(degrees, b.getWidth(), b.getHeight());Matrix temp = new Matrix(); float[] mirrorY = { -1, 0, 0, 0, 1, 0, 0, 0, 1 }; temp.setValues(mirrorY); m.postConcat(temp);try{Bitmap b2 = Bitmap.createBitmap(b, 0, 0, b.getWidth(), b.getHeight(), m, true);if(b!= b2){b.recycle();b = b2;}}catch(OutOfMemoryError ex){System.out.println("内存溢出异常");}catch(Exception e){System.out.println("出错了");}}return b;} 

使用例子：

Bitmap t1 = (Bitmap) Bitmap.createBitmap(tableBm, 0, 0, 51, 104); Bitmap bmtmp = t1.copy(Bitmap.Config.ARGB_8888, true); Bitmap t2 = (Bitmap) rotate(bmtmp,360); 

这样t2 就得到了t1的对称Y轴图片了。