圆角图片的方法和带倒影的图片方法

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。

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/**
* [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;

}
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