Gallery onKeyDown 按钮点击切换上一页下一页可以保留动画效果，但一些属性会使切换不

来自：http://www.eoeandroid.com/blog-136532-4536.html

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切换：

prePage.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubgallery.onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, null);}});nextPage.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubgallery.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);}});}
如果在代码调用了gallery.setSpacing(2)；这样的设置，会使prePage和nextPage中的onKeyDown失效。
如果想保留gallery.setSpacing( SPACING?),可以修改为private static final int SPACING = 2;prePage.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubdishGallery.onScroll(null, null, -1*(SPACING+1), 0);dishGallery.onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, null);}});nextPage.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubdishGallery.onScroll(null, null, SPACING+1, 0);dishGallery.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);}});}