Android自定义ImageView,方角，圆角头像（可根据自己的需求来设定头像的圆角或者方角的大小）

直接上代码，只要改代码的一处地方即可根据自己的需求来设置图片的圆角的大小

在xml中引用自定义的ImageView即可

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
* @ClassName: XCRoundRectImageView
* @Description: 自定义控件实现方角图片
* @author 菲尔普斯
* @date 2015-1-5 下午3:59:28
*
*/
public class XCRoundRectImageView extends ImageView {

     private Paint paint;

     public XCRoundRectImageView(Context context) {
          this(context, null);
     }

     public XCRoundRectImageView(Context context, AttributeSet attrs) {
          this(context, attrs, 0);
     }

     public XCRoundRectImageView(Context context, AttributeSet attrs, int defStyle) {
          super(context, attrs, defStyle);
          paint = new Paint();
     }

     /**
     * 绘制圆角矩形图片
     *
     * @author caizhiming
     */
     @SuppressLint("DrawAllocation")
     @Override
     protected void onDraw(Canvas canvas) {
          Drawable drawable = getDrawable();
          if (drawable != null) {
               Bitmap bitmap = drawableToBitmap(drawable);
               Bitmap b = getRoundBitmap(bitmap,360);       //360为一个圆形！改变这个值，可以根据自己的需求来设定
               final Rect rectSrc = new Rect(0, 0, b.getWidth(), b.getHeight());
               final Rect rectDest = new Rect(0, 0, getWidth(), getHeight());
               paint.reset();
               canvas.drawBitmap(b, rectSrc, rectDest, paint);

          } else {
               super.onDraw(canvas);
          }
     }

     /***
     * @Title: drawableToBitmap
     * @Description: Drawble转为bitmap
     * @param @param drawable
     * @param @return
     * @return Bitmap
     * @throws
     */
     public static Bitmap drawableToBitmap(Drawable drawable) {
          Bitmap bitmap;
          if (drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
               bitmap = Bitmap.createBitmap(100, 100, drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
          } else {
               bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
                         : Bitmap.Config.RGB_565);
          }
          Canvas canvas = new Canvas(bitmap);
          drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
          drawable.draw(canvas);
          return bitmap;
     }

     /**
     * 获取圆角矩形图片方法
     *
     * @param bitmap
     * @param roundPx
     *            ,一般设置成20
     * @return Bitmap
     * @author caizhiming
     */
     private Bitmap getRoundBitmap(Bitmap bitmap, int roundPx) {
          Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
          Canvas canvas = new Canvas(output);

          final int color = 0xff424242;

          final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
          final RectF rectF = new RectF(rect);
          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, rect, rect, paint);
          return output;

     }
}