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
- /* 将头像转为圆形 */
- Resources res = getResources();
- Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.head);
- head.setImageBitmap(ImageHelper.toRoundBitmap(bmp));
- //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;
- }
- }
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