XBitmapUtils.java 文件源码

/**
 * 获得带倒影的Bitmap
 *
 * @param bitmap 源Bitmap
 * @return 带倒影的Bitmap
 */
public static Bitmap createReflectionBitmap(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;
}