自定义ImageView-----可以让图片变圆角

/** * 自定义的圆角矩形ImageView，可以直接当组件在布局中使用。 * @author BeaHug *  注意在布局文件中  自定义控件XCRoundRectImageView可以代替 ImageView *  更多分享请关注 */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();    }    /**     * 绘制圆角矩形图片     * @author BeaHug     */    @Override    protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();        if (null != drawable) {            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();            //修改此处参数可以修改  圆角            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);        }    }    /**     * 获取圆角矩形图片方法     * @param bitmap     * @param roundPx,一般设置成14     * @return Bitmap     * @author BeaHug     */    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;    }}