自定义ImageView图片切角，切指定的边圆角

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import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Rect;import android.graphics.RectF;import android.util.AttributeSet;import android.util.TypedValue;import android.widget.ImageView;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;/** * 自定义图片切角，切指定的边。 * Created by czz on 2015/11/3. */public class SemicircleImageView extends ImageView {    private Paint paint;    public SemicircleImageView(Context context) {        this(context, null);    }    public SemicircleImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public SemicircleImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        paint = new Paint();    }    /**     * 绘制圆角矩形图片     *     * @author caizhiming     */    @Override    protected void onDraw(Canvas canvas) {        Drawable drawable = getDrawable();        if (null != drawable) {            Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();            //设置图片上半部图片圆角            Bitmap b = SemicircleImageView.fillet(SemicircleImageView.TOP,bitmap,dp2px(5));            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 int dp2px(int dp) {        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,                getContext().getResources().getDisplayMetrics());    }    public static final int ALL = 347120;    public static final int TOP = 547120;    public static final int LEFT = 647120;    public static final int RIGHT = 747120;    public static final int BOTTOM = 847120;    /**     *      * @param type     * @param bitmap     * @param roundPx     * @return     */    public static Bitmap fillet(int type, Bitmap bitmap, int roundPx) {        try {            final int width = bitmap.getWidth();            final int height = bitmap.getHeight();            Bitmap paintingBoard = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);            Canvas canvas = new Canvas(paintingBoard);            canvas.drawARGB(Color.TRANSPARENT, Color.TRANSPARENT, Color.TRANSPARENT, Color.TRANSPARENT);            final Paint paint = new Paint();            paint.setAntiAlias(true);            paint.setColor(Color.BLACK);            if (TOP == type) {                clipTop(canvas, paint, roundPx, width, height);            } else if (LEFT == type) {                clipLeft(canvas, paint, roundPx, width, height);            } else if (RIGHT == type) {                clipRight(canvas, paint, roundPx, width, height);            } else if (BOTTOM == type) {                clipBottom(canvas, paint, roundPx, width, height);            } else {                clipAll(canvas, paint, roundPx, width, height);            }            paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));            //帖子图            final Rect src = new Rect(0, 0, width, height);            final Rect dst = src;            canvas.drawBitmap(bitmap, src, dst, paint);            return paintingBoard;        } catch (Exception exp) {            return bitmap;        }    }    private static void clipLeft(final Canvas canvas, final Paint paint, int offset, int width, int height) {        final Rect block = new Rect(offset, 0, width, height);        canvas.drawRect(block, paint);        final RectF rectF = new RectF(0, 0, offset * 2, height);        canvas.drawRoundRect(rectF, offset, offset, paint);    }    private static void clipRight(final Canvas canvas, final Paint paint, int offset, int width, int height) {        final Rect block = new Rect(0, 0, width - offset, height);        canvas.drawRect(block, paint);        final RectF rectF = new RectF(width - offset * 2, 0, width, height);        canvas.drawRoundRect(rectF, offset, offset, paint);    }    private static void clipTop(final Canvas canvas, final Paint paint, int offset, int width, int height) {        final Rect block = new Rect(0, offset, width, height);        canvas.drawRect(block, paint);        final RectF rectF = new RectF(0, 0, width, offset * 2);        canvas.drawRoundRect(rectF, offset, offset, paint);    }    private static void clipBottom(final Canvas canvas, final Paint paint, int offset, int width, int height) {        final Rect block = new Rect(0, 0, width, height - offset);        canvas.drawRect(block, paint);        final RectF rectF = new RectF(0, height - offset * 2, width, height);        canvas.drawRoundRect(rectF, offset, offset, paint);    }    private static void clipAll(final Canvas canvas, final Paint paint, int offset, int width, int height) {        final RectF rectF = new RectF(0, 0, width, height);        canvas.drawRoundRect(rectF, offset, offset, paint);    }}
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