The method of drawing circular head in Android application _android

To draw this circle-shaded avatar, the individual breaks down into three layers

1, first draw the edge of the avatar gradient

Radialgradient gradient = new Radialgradient (j/2,k/2,j/2,new int[]{0xff5d5d5d,0xff5d5d5d,0x00ffffff},new float[]{0.f , 0.8f,1.0f}, Shader.TileMode.CLAMP);
Paint.setshader (gradient);
Canvas.drawcircle (J/2,k/2,j/2,paint);

2, cut out the round head bitmap

/** * Convert picture into round * @param bitmap incoming Bitmap Object * @return/Public bitmap Toroundbitmap (bitmap bitmap) {int width = Bi
  Tmap.getwidth ();
  int height = bitmap.getheight ();
  float ROUNDPX;
  float Left,top,right,bottom,dst_left,dst_top,dst_right,dst_bottom;
   if (width <= height) {roundpx = WIDTH/2-5;
   top = 0;
   bottom = width;
   left = 0;
   right = width;
   Height = width;
   Dst_left = 0;
   dst_top = 0;
   Dst_right = width;
  Dst_bottom = width;
   else {roundpx = HEIGHT/2-5;
   Float clip = (width-height)/2;
   left = clip;
   right = Width-clip;
   top = 0;
   bottom = height;
   width = height;
   Dst_left = 0;
   dst_top = 0;
   Dst_right = height;
  Dst_bottom = height;
  Bitmap output = bitmap.createbitmap (width, height, Bitmap.Config.ARGB_8888);
 
  Canvas Canvas = new Canvas (output);
  final int color = 0xff424242;
  Final Paint Paint = new Paint ();
  Final Rect src = new Rect (int) left, (int) top, (int) right, (int) bottom); FinaL Rect DST = new Rect (int) dst_left, (int) dst_top, (int) dst_right, (int) dst_bottom);
 
  Final RECTF RECTF = new RECTF (dst_left+15, dst_top+15, dst_right-20, dst_bottom-20);
 
  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, SRC, DST, paint);
 return output;
 }

3, the last painting on the white side

Paint Paint = new Paint ();
   Paint.setcolor (0xFFFFFFFF);
   Paint.setstrokewidth (ten);
   Paint.setstyle (Paint.Style.STROKE);
 
   Canvas.drawcircle (J/2,k/2,j/2-20,paint);

Ps:android app common icon size specification
1. Program Launch icon:
ldpi (Low density screen,120 DPI) with an icon size of X-px.
MDPI (Medium density screen, 160 DPI) with an icon size of X-px.
HDPI (High density screen, at the same size as the DPI), with an icon of X-px.
XHDPI (extra-high density screen, the image DPI) with an icon size of x px.
XXHDPI (xx-high density screen, and the DPI), whose icon size is 144 x 144 px.

2. Bottom menu icon
(1) Large screen:
Full picture (red): X-px
Icon (blue): X (px)
Icon outer frame (pink): x px

(2) Medium screen:
Complete Picture: X-px
Icon: x px
Icon outer border: x px

(3) Small screen:
Complete Picture: x + px
Icon: x px
Icon outline: x px

3. Pop-up dialog box top icon

Small screen x px low density screen (ldpi)
Medium x px Density screen (MDPI)
Da ping x (hdpi) px High density screen

4. long list Internal list item icon

Small screen x px low density screen (ldpi)
Medium x px Density screen (MDPI)
Da ping x (hdpi) px High density screen

5. Bottom or top tab tab icon

(1) Large screen (hdpi) screens:
Full picture (red): px x
Icon (blue): x px

(2) China screen (MDPI) screens:
Complete Picture: x px
Icon: x px

(3) Small screen (ldpi) screens:
Complete Picture: x px
Icon: x px

6. Bottom status bar icon

LDPI (at dpi) x PX small screen
MDPI (160 dpi) x PX Medium screen
HDPI (at the high dpi) x-px Large screen
XHDPI (+ +)-X + PX Super screen