Android实现圆形Imageview，带白色边框

最近做了个圆形Imageview，外面有白色边框

有需要的同学可以看看，效果如下

 

附上实现代码

RoundImageView：

public class RoundImageView extends ImageView { public RoundImageView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public RoundImageView(Context context) { super(context); init(); } private final RectF roundRect = new RectF(); private float rect_adius = 90; private final Paint maskPaint = new Paint(); private final Paint zonePaint = new Paint(); private void init() { maskPaint.setAntiAlias(true); maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); maskPaint.setFilterBitmap(true); zonePaint.setAntiAlias(true); zonePaint.setColor(Color.WHITE); zonePaint.setFilterBitmap(true); float density = getResources().getDisplayMetrics().density; rect_adius = rect_adius * density; } public void setRectAdius(float adius) { rect_adius = adius; invalidate(); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); int w = getWidth(); int h = getHeight(); roundRect.set(0, 0, w, h); } @Override public void draw(Canvas canvas) { canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG); canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint); //  canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG); super.draw(canvas); canvas.restore(); } }

xml文件：

 <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_centerVertical="true" android:gravity="center_vertical" >

        <com.example.view.RoundImageView android:id="@+id/img_user_icon" android:layout_width="100dp" android:layout_height="100dp" android:layout_centerHorizontal="true" android:scaleType="centerCrop" android:src="@drawable/user_icon" />

        <ImageView android:layout_width="100dp" android:layout_height="100dp" android:layout_centerHorizontal="true" android:background="@drawable/usericon_bg_circle" />
    </RelativeLayout>

drawable文件：

usericon_bg_circle.xml

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >

    <solid android:color="#00000000" />

    <corners android:radius="90dp" />

    <stroke android:width="2dp" android:color="#fff" />

</shape>