Gallery g = (Gallery)findViewById(R.id.secondButton); 因为这句运行报错，放鼠标在这上面时显示
This class was deprecated in API level 16.
This widget is no longer supported. Other horizontally scrolling widgets include
HorizontalScrollView and
ViewPager from the support library.
删除Gallery g = (Gallery)findViewById(R.id.secondButton);就可以了
用这种表示 secondButton = (Button)findViewById(R.id.secondButton);
求大神求解
android.widget.Button cannot be cast to android.widget.Gallery,布布扣,bubuko.com
android.widget.Button cannot be cast to android.widget.Gallery
原文：http://blog.csdn.net/u013365404/article/details/21561855