帮我写一个裁剪圆形的ImageView

好的，以下是一个裁剪圆形的ImageView的代码示例：

public class CircularImageView extends AppCompatImageView {
    private Paint paint;

    public CircularImageView(Context context) {
        this(context, null);
    }

    public CircularImageView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CircularImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        paint = new Paint();
        paint.setAntiAlias(true);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Drawable drawable = getDrawable();
        if (drawable != null) {
            Bitmap bitmap = drawableToBitmap(drawable);
            Bitmap circularBitmap = getCircularBitmap(bitmap);
            canvas.drawBitmap(circularBitmap, 0, 0, null);
        } else {
            super.onDraw(canvas);
        }
    }

    private Bitmap drawableToBitmap(Drawable drawable) {
        Bitmap bitmap = null;
        if (drawable instanceof BitmapDrawable) {
            BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
            if (bitmapDrawable.getBitmap() != null) {
                return bitmapDrawable.getBitmap();
            }
        }
        if (drawable.getIntrinsicWidth() <= 0 || drawable.getIntrinsicHeight() <= 0) {
            bitmap = Bitmap.createBitmap(1, 1, Bitmap.Config.ARGB_8888);
        } else {
            bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        }
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);
        return bitmap;
    }

    private Bitmap getCircularBitmap(Bitmap srcBitmap) {
        int width = srcBitmap.getWidth();
        int height = srcBitmap.getHeight();
        int radius = Math.min(width, height) / 2;
        Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        Rect rect = new Rect(0, 0, width, height);
        paint.setShader(new BitmapShader(srcBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));
        canvas.drawCircle(width / 2f, height / 2f, radius, paint);
        return output;
    }
}

这个自定义View继承自AppCompatImageView，重写了onDraw()方法，使用BitmapShader和Canvas.drawCircle()方法实现了圆形裁剪效果。同时，重写了drawableToBitmap()方法，用于将Drawable转换为Bitmap。

使用这个自定义View只需要在布局文件中替换原有的ImageView，将其改为com.example.CircularImageView即可。