Android uses the bitmap class to turn a rectangular picture into a circular method _android

Generally to do a circular picture, can only be based on the square can be achieved, otherwise it becomes an ellipse, the following say how to make a rectangular picture of a circular picture
Don't say much nonsense, no picture no truth, first on the map:
Original:

After turning into a positive circle:

The following code:

public static Bitmap Makeroundcorner (Bitmap Bitmap) {int width = bitmap.getwidth (); 
  int height = bitmap.getheight (); 
  int left = 0, top = 0, right = width, bottom = height; 
  float roundpx = HEIGHT/2; 
    if (width > height) {left = (width-height)/2; 
    top = 0; 
    right = left + height; 
  bottom = height; 
    else if (height > width) {left = 0; 
    top = (height-width)/2; 
    right = width; 
    Bottom = top + width; 
  ROUNDPX = WIDTH/2; 
 
  ZLOG.I (TAG, "PS:" + Left + "," + Top + "," + Right + "," + bottom); 
  Bitmap output = bitmap.createbitmap (width, height, Bitmap.Config.ARGB_8888); 
  Canvas Canvas = new Canvas (output); 
  int color = 0xff424242; 
  Paint Paint = new Paint (); 
  Rect Rect = new Rect (left, top, right, bottom); 
 
  RECTF RECTF = new RECTF (rect); 
  Paint.setantialias (TRUE); 
  Canvas.drawargb (0, 0, 0, 0); 
  Paint.setcolor (color); 
  Canvas.drawroundrect (RECTF, ROUNDPX, ROUNDPX, paint); Paint.setxfermode (New PorteRduffxfermode (PorterDuff.Mode.SRC_IN)); 
  Canvas.drawbitmap (Bitmap, rect, rect, paint); 
return output; 
 }

Here's another explanation:
Because the picture is rectangular, so the picture of the width and height of the image must be smaller than the other side, to generate a square on the smallest side as the benchmark, and then trim to the other side of the display range
As for the radius of the rounded corner is a square width of half, with CSS to know, draw a circle is very convenient Border-radius set to 50% on it, is a truth
Android's UI is so tedious.

Rectangle to draw a rounded corner code:

public static Bitmap Makeroundcorner (Bitmap Bitmap, int px) 
{ 
  int width = bitmap.getwidth (); 
  int height = bitmap.getheight (); 
  Bitmap output = bitmap.createbitmap (width, height, Bitmap.Config.ARGB_8888); 
  Canvas Canvas = new Canvas (output); 
  int color = 0xff424242; 
  Paint Paint = new Paint (); 
  Rect Rect = new Rect (0, 0, width, height); 
  RECTF RECTF = new RECTF (rect); 
  Paint.setantialias (true); 
  Canvas.drawargb (0, 0, 0, 0); 
  Paint.setcolor (color); 
  Canvas.drawroundrect (RECTF, px, px, paint); 
  Paint.setxfermode (New Porterduffxfermode (PorterDuff.Mode.SRC_IN)); 
  Canvas.drawbitmap (Bitmap, rect, rect, paint); 
  return output;