android获得圆角图片

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import com.loopj.android.image.SmartImageView;

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;

public class RoundSmartImageView extends SmartImageView {
private Paint paint;

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

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

public RoundSmartImageView(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
 */
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;

}

}

xml中： <包名.view.RoundSmartImageView
android:id=”@+id/user_photo”
android:layout_width=”40dp”
android:layout_height=”40dp” />
.java文件中调用：
RoundSmartImageView mImageView = (RoundSmartImageView) convertView.findViewById(R.id.user_photo);
mImageView.setImageUrl(job.getImgUrl(),R.drawable.ic_launcher); //如果job.getImagUrl()为空，默认加载R.drawable.ic_launcher；