Scale the short side of the bitmap to goal value and limit the long side to the limit value.

Bitmap.scaleShortAndLimitLong

/**
	 * 把小边放大至要求值，同时限制大边不超过要求值
	 * 
	 * @param bitmap
	 * @param shortSideGoal
	 *            短边需要放大到的目标值
	 * @param longSideLimit
	 *            长边需要被限制的值得
	 * @return
	 */
	public static Bitmap scaleShortAndLimitLong(Bitmap bitmap, float shortSideGoal, float longSideLimit) {
		if (bitmap == null) {
			return null;
		}
		if (bitmap.isRecycled()) {
			return null;
		}

		if (shortSideGoal < Math.min(bitmap.getWidth(), bitmap.getHeight())) {
			return bitmap;
		}

		float sx = 1.0f;
		float sy = 1.0f;

		if (bitmap.getWidth() > bitmap.getHeight()) {// 如果y方向是短边
			sy = shortSideGoal / bitmap.getHeight();
			sx = sy;
			if (bitmap.getWidth() * sx > longSideLimit) {
				sx = longSideLimit / bitmap.getWidth();
			}
		} else {// 如果x方向是短边
			sx = shortSideGoal / bitmap.getWidth();
			sy = sx;
			if (bitmap.getHeight() * sy > longSideLimit) {
				sy = longSideLimit / bitmap.getHeight();
			}
		}

		Matrix matrix = new Matrix();
		matrix.postScale(sx, sy);
		Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
		return resizeBmp;
	}