圆角头像的实现

2024-06-04 10:08

文章标签 实现圆角头像

本文主要是介绍圆角头像的实现，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

在Activity中调用

[java]  view plain copy  
 /* 将头像转为圆形 */  
    Resources res = getResources();  
    Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.head);  
    head.setImageBitmap(ImageHelper.toRoundBitmap(bmp));  

[java]  view plain copy  
 //处理类  
 public class ImageHelper {  
     /** 
      * 转换图片成圆形 
      * @param bitmap 传入Bitmap对象 
      * @return 
      */  
     public static Bitmap toRoundBitmap(Bitmap bitmap) {  
             int width = bitmap.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;  
                     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;  
                     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, 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);  
   
             paint.setAntiAlias( true);  
               
             canvas.drawARGB(0, 0, 0, 0);  
             paint.setColor(color);  
             canvas.drawRoundRect(rectF, roundPx, roundPx, paint);  
   
             paint.setXfermode( new PorterDuffXfermode(Mode.SRC_IN));  
             canvas.drawBitmap(bitmap, src, dst, paint);  
             return output;  
     }  
      
     // 下载图片转为bitmap  
     public static Bitmap getHttpBitmap(String url) {  
       URL u = null;  
       Bitmap bmp = null;  
        try {  
           u = new URL(url);  
   
       } catch (Exception e) {  
           // TODO: handle exception  
       }  
        try {  
           HttpURLConnection conn = (HttpURLConnection) u.openConnection();  
           conn.setConnectTimeout(0);  
           conn.setDoInput( true);  
           conn.connect();  
           InputStream ins = conn.getInputStream();  
           bmp = BitmapFactory. decodeStream(ins);  
           ins.close();  
       } catch (Exception e) {  
           // TODO: handle exception  
       }  
        return bmp;  
     }  
 }  