Unable to instantiate fragment make sure class name....
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最近使用Viewpager + Fragment来做应用，经常会遇到如下错误
E/UncaughtException-main(13661): java.lang.RuntimeException: Unable to start activity ComponentInfo{......}: android.app.Fragment$InstantiationException: Unable to instantiate fragment xxxxxx...: make sure class name exists, is public, and has an empty constructor that is public解决办法：
自定义的fragment 如果只定义了带参数的构造方法，那么要把参数为空的构造函数一并写上。原因待进一步研究，知道的朋友不吝赐教！
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