自定义imageView

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package com.xc.xcskin.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.widget.ImageView;/** * 自定义的圆形ImageView，可以直接当组件在布局中使用。 * @author caizhiming * */public class XCRoundImageView extends ImageView{    private Paint paint ;        public XCRoundImageView(Context context) {          this(context,null);      }        public XCRoundImageView(Context context, AttributeSet attrs) {          this(context, attrs,0);      }        public XCRoundImageView(Context context, AttributeSet attrs, int defStyle) {          super(context, attrs, defStyle);         paint = new Paint();            }        /**     * 绘制圆形图片     * @author caizhiming     */    @Override      protected void onDraw(Canvas canvas) {            Drawable drawable = getDrawable();          if (null != drawable) {              Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();              Bitmap b = getCircleBitmap(bitmap, 14);              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);          }      }        /**     * 获取圆形图片方法     * @param bitmap     * @param pixels     * @return Bitmap     * @author caizhiming     */    private Bitmap getCircleBitmap(Bitmap bitmap, int pixels) {          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());          paint.setAntiAlias(true);          canvas.drawARGB(0, 0, 0, 0);          paint.setColor(color);          int x = bitmap.getWidth();                 canvas.drawCircle(x / 2, x / 2, x / 2, paint);          paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));          canvas.drawBitmap(bitmap, rect, rect, paint);          return output;                      }  }

完成这个自定义类后，就可以使用这个类了，就是把这个当组件在布局中使用即可，比如：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >        <com.xc.xcskin.view.XCRoundImageView        android:id="@+id/roundImageView"          android:layout_centerInParent="true"         android:layout_width="200dp"           android:layout_height="200dp"        android:src="@drawable/roundimageview"          />                    </RelativeLayout>

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