带有动态圆环的圆形图片控件DynamicAvatarView答案.doc

带有动态圆环的圆形图片控件DynamicAvatarView 现在大部分的app上难免会使用到圆形头像，所以今天我给大家分享一个单独使用的，并且周围带有圆环动画的花哨圆形头像控件，本控件是在圆形头像控件基础上实现的，只是在其周围再画一些不同大小的圆而已，就可以实现如图的效果 圆形头像的基本原理是将设置的资源文件转化成Bitmap,然后通过BitmapShader类将Bitmap成为Paint的渲染器，然后在onDraw()中通过canvas.drawCircle(rx,ry,radius,paint);画布上画圆，而这个圆就是形成了圆形头像。 在xml中通过src设置的资源文件在ImageView的setImageDrawable(drawable)方法中可以得到Drawable类型的图像，然后再将Drawable转成Bitmap就可以了 [java] view plain copy public void setImageDrawable(Drawable drawable) { super.setImageDrawable(drawable); mBitmap = getBitmapFromDrawable(drawable); setup(); } private Bitmap getBitmapFromDrawable(Drawable drawable) { if (drawable == null) { return null; } if (drawable instanceof BitmapDrawable) { //从bitmap中间裁剪出最大的正方形 Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap(); return getMaxSquareCenter(bitmap); //return ((BitmapDrawable) drawable).getBitmap(); } try { Bitmap bitmap; if (drawable instanceof ColorDrawable) { bitmap = Bitmap.createBitmap(COLORDRAWABLE_DIMENSION, COLORDRAWABLE_DIMENSION, BITMAP_CONFIG); } else { int min = Math.min(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()); bitmap = Bitmap.createBitmap(min, min, BITMAP_CONFIG); } Canvas canvas = new Canvas(bitmap); int left,top,right,buttom; int width = canvas.getWidth(); int height = canvas.getHeight(); int abs = Math.abs(width - height); if(width = height){ left = 0; top = (height - abs) / 2; right = width; buttom = height - top; }else{ left = (width - abs) / 2; top = 0; right = width - left; buttom = hei