android通过扩展gallery实现coverflow的效果 图片浏览器代码

  次阅读 来源:互联网(转载协议) 2015-10-03 10:43 我要评论(0)

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 matrix applied to it.

// We only want the bottom half of the image

Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,

height / 2, width, height / 2, matrix, false);

// Create a new bitmap with same width but taller to fit

// reflection

Bitmap bitmapWithReflection = Bitmap.createBitmap(width,

(height + height / 2), 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();

canvas.drawRect(0, height, width, height + reflectionGap,

deafaultPaint);

// Draw in the reflection

canvas.drawBitmap(reflectionImage, 0, height + reflectionGap,

null);

// Create a shader that is a linear gradient that covers the

// reflection

Paint paint = new Paint();

LinearGradient shader = new LinearGradient(0,

originalImage.getHeight(), 0,

bitmapWithReflection.getHeight() + reflectionGap,

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

canvas.drawRect(0, height, width,

bitmapWithReflection.getHeight() + reflectionGap, paint);

ImageView imageView = new ImageView(mContext);

imageView.setImageBitmap(bitmapWithReflection);

imageView

.setLayoutParams(new GalleryFlow.LayoutParams(160, 240));

// imageView.setScaleType(ScaleType.MATRIX);

mImages[index++] = imageView;

}

return true;

}

public int getCount() {

return mImageIds.length;

}

public Object getItem(int position) {

return position;

}

public long getItemId(int position) {

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