实现圆角图片——自定义控ImageView

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();
}

@Override
protected void onDraw(Canvas canvas) {

Drawable drawable = getDrawable();
if (null != drawable) {
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
//在这里设置图片圆的度数
 Bitmap b = getRoundBitmap(bitmap, 360);
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);
}
}

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);
int x = bitmap.getWidth();

canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;

}
}

<demo.test.com.app.utils.XCRoundRectImageView
android:id="@+id/iv_
4000
head"
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"

/>