Gallery默认第一项居左解决方案
网上找的，暂时用不到没测试过。
Android 中的Gallery控件默认会将第一项居中显示，在某些场景会影响用户体验，分享一下居左的解决方案：

/*** Align the first gallery item to the left.** @param parentView The view containing the gallery widget (we assume the gallery width* is set to match_parent)* @param gallery The gallery we have to change*/private void alignGalleryToLeft(View parentView, Gallery gallery) {int galleryWidth = parentView.getWidth();// We are taking the item widths and spacing from a dimension resource because:// 1. No way to get spacing at runtime (no accessor in the Gallery class)// 2. There might not yet be any item view created when we are calling this// functionint itemWidth = context.getResources().getDimensionPixelSize(R.dimen.gallery_item_width);int spacing = context.getResources().getDimensionPixelSize(R.dimen.gallery_spacing);// The offset is how much we will pull the gallery to the left in order to simulate// left alignment of the first itemint offset;if (galleryWidth <= itemWidth) {offset = galleryWidth / 2 - itemWidth / 2 - spacing;} else {offset = galleryWidth - itemWidth - 2 * spacing;}offset = 0;// Now update the layout parameters of the gallery in order to set the left marginMarginLayoutParams mlp = (MarginLayoutParams) gallery.getLayoutParams();mlp.setMargins(-offset, mlp.topMargin, mlp.rightMargin, mlp.bottomMargin);}

http://androidit.diandian.com/post/b8c29a20-e368-11e0-94a3-782bcb32ff27

Android自定义Gallery，实现CoverFlow效果
http://bigcat.easymorse.com/?p=1391