Android如何获得圆角图片和带倒影的图片

最新推荐文章于 2021-09-24 00:10:39 发布

原创最新推荐文章于 2021-09-24 00:10:39 发布 · 681 阅读

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#圆角 #倒影

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本文介绍了一种在程序中生成圆角图片的方法，并提供了一个实现带有倒影效果图片的技术方案。通过使用Bitmap、Canvas及Paint等组件，文章详细展示了如何设置参数来创建所需的视觉效果。

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<span style="font-size:18px;">/**
	 * 获得圆角图片的方法
	 * 
	 * @param bitmap
	 * @param roundPx
	 *            一般设成14
	 * @return
	 */
	public static 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;
	}

	/**
	 * 获得带倒影的图片方法
	 * 
	 * @param bitmap
	 * @return
	 */
	public static 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;
	}
</span>