android中Bitmap转换角度

public static Bitmap changeBitmap(Bitmap bitmap){
     
            Matrix matrix = new Matrix();
            //转换角度 rotation 
            int rotation = -90;
            matrix.setRotate(rotation);
            
            return  Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            
    }