重写ImageView画圆

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import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;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;public class CustomImageView extends ImageView{   public CustomImageView(Context context) {      super(context);      // TODO Auto-generated constructor stub   }   public CustomImageView(Context context, AttributeSet attrs, int defStyle) {      super(context, attrs, defStyle);      // TODO Auto-generated constructor stub   }   public CustomImageView(Context context, AttributeSet attrs) {      super(context, attrs);      // TODO Auto-generated constructor stub   }      @Override    protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();        if (drawable == null) {            return;        }        if (getWidth() == 0 || getHeight() == 0) {            return;        }        Bitmap b =  ((BitmapDrawable)drawable).getBitmap() ;        Bitmap bitmap = b.copy(Config.ARGB_8888, true);        Bitmap roundBitmap =  getCroppedBitmap(bitmap, getWidth());        canvas.drawBitmap(roundBitmap, 0, 0, null);    }    public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) {        Bitmap sbmp;        if(bmp.getWidth() != radius || bmp.getHeight() != radius)            sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false);        else            sbmp = bmp;        Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(), Config.ARGB_8888);        final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight());        Paint paint = new Paint();        paint.setAntiAlias(true);        paint.setFilterBitmap(true);        paint.setDither(true);        paint.setColor(Color.parseColor("#BAB399"));        Canvas c = new Canvas(output);        c.drawARGB(0, 0, 0, 0);        c.drawCircle(sbmp.getWidth() / 2+0.7f, sbmp.getHeight() / 2+0.7f, sbmp.getWidth() / 2+0.1f, paint);        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));        c.drawBitmap(sbmp, rect, rect, paint);        return output;    }}
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