自定义圆形头像图标控件

1. 创建RoundImageView.class

2. `public class RoundImageView extends ImageView {
   private int mBorderThickness = 0;
   private Context mContext;
   private int defaultColor = 0xFFFFFFFF;
   // 如果只有其中一个有值，则只画一个圆形边框
   private int mBorderOutsideColor = 0;
   private int mBorderInsideColor = 0;
   // 控件默认长、宽
   private int defaultWidth = 0;
   private int defaultHeight = 0;

   public RoundImageView(Context context) {
   super(context);
   mContext = context;
   }

   public RoundImageView(Context context, AttributeSet attrs) {
   super(context, attrs);
   mContext = context;
   setCustomAttributes(attrs);
   }

   public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
   super(context, attrs, defStyle);
   mContext = context;
   setCustomAttributes(attrs);
   }

   private void setCustomAttributes(AttributeSet attrs) {
   TypedArray a = mContext.obtainStyledAttributes(attrs,
   R.styleable.roundedimageview);
   mBorderThickness = a.getDimensionPixelSize(
   R.styleable.roundedimageview_border_thickness, 0);
   mBorderOutsideColor = a
   .getColor(R.styleable.roundedimageview_border_outside_color,
   defaultColor);
   mBorderInsideColor = a.getColor(
   R.styleable.roundedimageview_border_inside_color, defaultColor);
   }

   @Override
   protected void onDraw(Canvas canvas) {
   Drawable drawable = getDrawable();
   if (drawable == null) {
   return;
   }

   if (getWidth() == 0 || getHeight() == 0) {    return;}this.measure(0, 0);if (drawable.getClass() == NinePatchDrawable.class)    return;Bitmap b = ((BitmapDrawable) drawable).getBitmap();Bitmap bitmap = b.copy(Config.ARGB_8888, true);if (defaultWidth == 0) {    defaultWidth = getWidth();}if (defaultHeight == 0) {    defaultHeight = getHeight();}// 保证重新读取图片后不会因为图片大小而改变控件宽、高的大小（针对宽、高为wrap_content布局的imageview，但会导致margin无效）// if (defaultWidth != 0 && defaultHeight != 0) {// LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(// defaultWidth, defaultHeight);// setLayoutParams(params);// }int radius = 0;if (mBorderInsideColor != defaultColor        && mBorderOutsideColor != defaultColor) {// 定义画两个边框，分别为外圆边框和内圆边框    radius = (defaultWidth < defaultHeight ? defaultWidth            : defaultHeight) / 2 - 2 * mBorderThickness;    // 画内圆    drawCircleBorder(canvas, radius + mBorderThickness / 2,            mBorderInsideColor);    // 画外圆    drawCircleBorder(canvas, radius + mBorderThickness            + mBorderThickness / 2, mBorderOutsideColor);} else if (mBorderInsideColor != defaultColor        && mBorderOutsideColor == defaultColor) {// 定义画一个边框    radius = (defaultWidth < defaultHeight ? defaultWidth            : defaultHeight) / 2 - mBorderThickness;    drawCircleBorder(canvas, radius + mBorderThickness / 2,            mBorderInsideColor);} else if (mBorderInsideColor == defaultColor        && mBorderOutsideColor != defaultColor) {// 定义画一个边框    radius = (defaultWidth < defaultHeight ? defaultWidth            : defaultHeight) / 2 - mBorderThickness;    drawCircleBorder(canvas, radius + mBorderThickness / 2,            mBorderOutsideColor);} else {// 没有边框    radius = (defaultWidth < defaultHeight ? defaultWidth            : defaultHeight) / 2;}Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight        / 2 - radius, null);

   }

   /**

   • 获取裁剪后的圆形图片
     *

   • @param radius 半径
     */
     public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
     Bitmap scaledSrcBmp;
     int diameter = radius * 2;

     // 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片
     int bmpWidth = bmp.getWidth();
     int bmpHeight = bmp.getHeight();
     int squareWidth = 0, squareHeight = 0;
     int x = 0, y = 0;
     Bitmap squareBitmap;
     if (bmpHeight > bmpWidth) {// 高大于宽
     squareWidth = squareHeight = bmpWidth;
     x = 0;
     y = (bmpHeight - bmpWidth) / 2;
     // 截取正方形图片
     squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
     squareHeight);
     } else if (bmpHeight < bmpWidth) {// 宽大于高
     squareWidth = squareHeight = bmpHeight;
     x = (bmpWidth - bmpHeight) / 2;
     y = 0;
     squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
     squareHeight);
     } else {
     squareBitmap = bmp;
     }

     if (squareBitmap.getWidth() != diameter
     || squareBitmap.getHeight() != diameter) {
     scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
     diameter, true);

     } else {
     scaledSrcBmp = squareBitmap;
     }
     Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
     scaledSrcBmp.getHeight(), Config.ARGB_8888);
     Canvas canvas = new Canvas(output);

     Paint paint = new Paint();
     Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
     scaledSrcBmp.getHeight());

     paint.setAntiAlias(true);
     paint.setFilterBitmap(true);
     paint.setDither(true);
     canvas.drawARGB(0, 0, 0, 0);
     canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
     scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
     paint);
     paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
     canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
     // bitmap回收(recycle导致在布局文件XML看不到效果)
     // bmp.recycle();
     // squareBitmap.recycle();
     // scaledSrcBmp.recycle();
     bmp = null;
     squareBitmap = null;
     scaledSrcBmp = null;
     return output;
     }

   /**

   • 边缘画圆
     */
     private void drawCircleBorder(Canvas canvas, int radius, int color) {
     Paint paint = new Paint();
     /* 去锯齿 */
     paint.setAntiAlias(true);
     paint.setFilterBitmap(true);
     paint.setDither(true);
     paint.setColor(color);
     /* 设置paint的　style　为STROKE：空心 */
     paint.setStyle(Paint.Style.STROKE);
     /* 设置paint的外框宽度 */
     paint.setStrokeWidth(mBorderThickness);
     canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
     }
     `

3. 定义属性文件attrs.xml

4. <?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="roundedimageview">
<attr name="border_thickness" format="dimension"/>
<attr name="border_inside_color" format="color"/>
<attr name="border_outside_color" format="color"></attr>
</declare-styleable>
</resources>


   5.布局文件中引用


<com.android.xx.widget.RoundImageView
android:id="@+id/cover_user_photo"
android:layout_width="80dp"
android:layout_height="80dp"
android:scaleType="centerCrop"
android:src="@drawable/face"
imagecontrol:border_inside_color="#fff7f2e9"
imagecontrol:border_outside_color="#ffd5d1c8"
imagecontrol:border_thickness="3dp"/>