public CircleImageView(Context context, AttributeSet attrs) {
  super(context, attrs);
 }

@Override
 protected void onDraw(Canvas canvas) {
  //獲得圖片的寬度
  int width=getWidth();
  //獲得圖片的高度
  int height=getHeight();
  //短的二分之一作為半徑
  int radius=height>width?width/2:height/2;

  //重新定義的一個畫布，這一步很關(guān)鍵
  Paint mPaint = new Paint();
  //抗鋸齒
  mPaint.setAntiAlias(true);
  Bitmap bitmap = Bitmap.createBitmap(width,height,
    Bitmap.Config.ARGB_8888);
  Canvas bitmapCanvas = new Canvas(bitmap);
  super.onDraw(bitmapCanvas);

  //圓形的框
  Bitmap cB = Bitmap.createBitmap(width, height,
    Bitmap.Config.ARGB_8888);
  Canvas cCanv = new Canvas(cB);
  //在控件中間畫一個
  cCanv.drawCircle(width/ 2, height/ 2, radius,
    mPaint);

  canvas.drawBitmap(bitmap, 0.0f, 0.0f, mPaint);
  //dst是后畫的圖形
  mPaint.setXfermode(new PorterDuffXfermode(
    PorterDuff.Mode.DST_IN));
  //一定要用之前的畫布，不然會出現(xiàn)邊角是黑色
  bitmapCanvas.drawBitmap(cB, 0.0f, 0.0f, mPaint);

  //給圖形加邊框
  Paint paint =new Paint();
  paint.setAntiAlias(true);
  paint.setStyle(Paint.Style.STROKE);
  paint.setStrokeWidth(5);
  paint.setColor(Color.BLACK);
  canvas.drawCircle(width/ 2, height/ 2, radius,
    paint);

 }

<com.example.jkgeekjk.roadtodevelop3.CircleImageView
  android:layout_width="match_parent"
  android:src="@drawable/avastar"
  android:layout_height="match_parent" />