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【Java】在Android中创建投影特效

作者:彦伶 / 发布于2015/3/10/ 634


	private Bitmap getReflection(Bitmap bitmap) {
	 Bitmap reflection = reflections.get(bitmap);
	 if (reflection == null) {
	 // We're cropping the height of the reflection to 80
	 int reflectionH = 80;
	 reflection = Bitmap.createBitmap(bitmap.getWidth(),
	 reflectionH, Bitmap.Config.ARGB_8888);

	 Bitmap blurryBitmap = Bitmap.createBitmap(bitmap, 0,
	 bitmap.getHeight() - reflectionH,
	 bitmap.getWidth(), reflectionH);
	 // cheap and easy scaling algorithm; down-scale it, then
	 // upscale it. The filtering during the scale operations
	 // will blur the resulting image
	 blurryBitmap = Bitmap.createScaledBitmap(
	 Bitmap.createScaledBitmap(
	 blurryBitmap,blurryBitmap.getWidth() / 2,
	 blurryBitmap.getHeight() / 2, true),
	 blurryBitmap.getWidth(), blurryBitmap.getHeight(), true);
	 // This shader will hold a cropped, inverted,
	 // blurry version of the original image
	 BitmapShader bitmapShader = new BitmapShader(blurryBitmap,
	 TileMode.CLAMP, TileMode.CLAMP);
	 Matrix invertMatrix = new Matrix();
	 invertMatrix.setScale(1f, -1f);
	 invertMatrix.preTranslate(0, -reflectionH);
	 bitmapShader.setLocalMatrix(invertMatrix);

	 // This shader holds an alpha gradient
	 Shader alphaGradient = new LinearGradient(0, 0, 0, reflectionH,
	 0x80ffffff, 0x00000000, TileMode.CLAMP);

	 // This shader combines the previous two, resulting in a
	 // blurred, fading reflection
	 ComposeShader compositor = new ComposeShader(bitmapShader,
	 alphaGradient, PorterDuff.Mode.DST_IN);

	 Paint reflectionPaint = new Paint();
	 reflectionPaint.setShader(compositor);

	 // Draw the reflection into the bitmap that we will return
	 Canvas canvas = new Canvas(reflection);
	 canvas.drawRect(0, 0, reflection.getWidth(),
	 reflection.getHeight(), reflectionPaint);
	 }
	 return reflection;

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　投影特效　

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