Android布局中设置圆形图片

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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;

public class XImageView extends ImageView {

private Paint paint;public XImageView(Context context) {    this(context, null);}public XImageView(Context context, AttributeSet attrs) {    this(context, attrs, 0);}public XImageView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    paint = new Paint();}/** * 绘制圆形图片 *  * @author caizhiming */@Overrideprotected 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;}

}

继承一个Imageview 把它当控件使，如：com.test.imageview
用到布局中就行了

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