圆角图片的方法和带倒影的图片方法

最新推荐文章于 2021-02-25 14:53:19 发布

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本文介绍如何通过Android平台的Bitmap操作实现图片的圆角效果及带倒影的图片效果。具体包括getRoundedCornerBitmap方法用于创建指定圆角大小的图片，以及createReflectionImageWithOrigin方法用于为图片添加倒影。


/**
     * [一句话功能简述]<BR>
     * [功能详细描述] 获得圆角图片的方法
     * 
     * @param bitmap 被处理的bitmap
     * @param roundPx 圆角值
     * @return Bitmap
     */
    public Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx)
    {

        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
            .getHeight(), Config.ARGB_8888);

        Canvas canvas = new Canvas(output);

        final int color = 0xff424242;

        final Paint paint = new Paint();

        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);

        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;

    }

    /**
     * [一句话功能简述]<BR>
     * [功能详细描述] 获得带倒影的图片方法
     * 
     * @param bitmap 被处理的bitmap
     * @return Bitmap
     */
    public Bitmap createReflectionImageWithOrigin(Bitmap bitmap)
    {

        final int reflectionGap = 4;

        int width = bitmap.getWidth();

        int height = bitmap.getHeight();

        Matrix matrix = new Matrix();

        matrix.preScale(1, -1);

        Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2,
            width, height / 2, matrix, false);

        Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
            (height + height / 2), Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmapWithReflection);

        canvas.drawBitmap(bitmap, 0, 0, null);

        Paint deafalutPaint = new Paint();

        canvas
            .drawRect(0, height, width, height + reflectionGap, deafalutPaint);

        canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

        Paint paint = new Paint();

        LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
            bitmapWithReflection.getHeight()

            + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);

        paint.setShader(shader);

        // Set the Transfer mode to be porter duff and destination in   

        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

        // Draw a rectangle using the paint with our linear gradient   

        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
            + reflectionGap, paint);

        return bitmapWithReflection;

    }