我有一张图片，我想在 Android 应用程序中反映该图片，下面是源代码。我找到了一个示例代码
ImageView imageView = (ImageView) findViewById(R.id.image1);
imageView.setImageResource(imageIDs[position]);
//The gap we want between the reflection and the original image
final int reflectionGap = 4;
//Get you bit map from drawable folder
Bitmap originalImage = BitmapFactory.decodeResource(getResources(),
imageIDs[position]);
int width = originalImage.getWidth();
int height = originalImage.getHeight();
//This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
//Create a Bitmap with the flip matix applied to it.
//We only want the bottom half of the image
Bitmap reflectionImage ;
if(isVertical)
reflectionImage= Bitmap.createBitmap(originalImage, 0, height/2, width, height/2, matrix, false);
else
reflectionImage= Bitmap.createBitmap(originalImage, width/2, 0, width/2, height, matrix, false);
//Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection;
if(isVertical)
bitmapWithReflection = Bitmap.createBitmap(width
, (height + height/2), Config.ARGB_8888);
else
bitmapWithReflection = Bitmap.createBitmap(width +width/2
, height, Config.ARGB_8888);
//Create a new Canvas with the bitmap that's big enough for
//the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
//Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
//Draw in the gap
Paint deafaultPaint = new Paint();
if(isVertical)
canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
else
canvas.drawRect(width, 0, width+reflectionGap, height, deafaultPaint);
//Draw in the reflection
if(isVertical)
canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);
else
canvas.drawBitmap(reflectionImage,width + reflectionGap,0 , null);
//Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader;
if(isVertical)
shader = new LinearGradient(0, originalImage.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff,
TileMode.CLAMP);
else
shader = new LinearGradient(originalImage.getWidth(),0,
bitmapWithReflection.getWidth() + reflectionGap,0, 0x70ffffff, 0x00ffffff,
TileMode.CLAMP);
//Set the paint to use this shader (linear gradient)
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
if(isVertical)
canvas.drawRect(0, height, width,
bitmapWithReflection.getHeight() + reflectionGap, paint);
else
canvas.drawRect(width, 0, bitmapWithReflection.getWidth() + reflectionGap,
height, paint);
//Create an Image view and add our bitmap with reflection to it
//ImageView imageView = new ImageView(this);
imageView.setImageBitmap(bitmapWithReflection);`
当我在图像底部给出 isVertical 值 = true 时，此示例可以正常工作，但我也想在图像右侧使用反射效果，因为我认为它在横向模式下会更好。但它不像我想要的那样工作。它显示反射侧上下颠倒。我的错误是什么？谢谢。