在日常使用中我们经常会使用到圆形的图片，但是android系统中并没有默认的圆形控件，所以我们需要自己来写一个自定义的ImagView来显示一张圆形的图片，下面先看效果

详细的方法是我们自定义一个类，继承ImagView，然后重写一些方法，下面是代码

/**  * 圆形的ImagView  *  * @author Administrator * */ public class RoundImageView extends ImageView { public RoundImageView(Context context) { super(context); // TODO Auto-generated constructor stub } public RoundImageView(Context context, AttributeSet attrs) { super(context, attrs); } public RoundImageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } @Override protected void onDraw(Canvas canvas) { Drawable drawable = getDrawable(); if (drawable == null) { return; } if (getWidth() == 0 || getHeight() == 0) { return; } Bitmap b = ((BitmapDrawable) drawable).getBitmap(); if (null == b) { return; } Bitmap bitmap = b.copy(Config.ARGB_8888, true); int w = getWidth(), h = getHeight(); Bitmap roundBitmap = getCroppedBitmap(bitmap, w); canvas.drawBitmap(roundBitmap, 0, 0, null); } public static Bitmap getCroppedBitmap(Bitmap bmp, int radius) { Bitmap sbmp; if (bmp.getWidth() != radius || bmp.getHeight() != radius) sbmp = Bitmap.createScaledBitmap(bmp, radius, radius, false); else sbmp = bmp; Bitmap output = Bitmap.createBitmap(sbmp.getWidth(), sbmp.getHeight(), Config.ARGB_8888); Canvas canvas = new Canvas(output); final int color = 0xffa19774; final Paint paint = new Paint(); final Rect rect = new Rect(0, 0, sbmp.getWidth(), sbmp.getHeight()); paint.setAntiAlias(true); paint.setFilterBitmap(true); paint.setDither(true); canvas.drawARGB(0, 0, 0, 0); //设置笔的颜色 paint.setColor(Color.parseColor("#BAB399")); //画圆 canvas.drawCircle(sbmp.getWidth() / 2 + 0.5f, sbmp.getHeight() / 2 + 0.5f, sbmp.getWidth() / 2 + 0.5f, paint); paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN)); canvas.drawBitmap(sbmp, rect, rect, paint); return output; } }

然后在布局中引用这个自定义的控件， 就可以了

<里面的是你的包名加自定义的类名，如果按住Ctrl+鼠标左键能进入类的话，就说明引用成功了。

这样就可以了