极致精简的fragment实现导航栏切换demo
极致精简的fragment实现导航栏切换demo 注意：FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 不能讲fragmentTransaction 设为全局变量。否则会报commit has already execute!
极致精简的fragment实现导航栏切换demo 注意：FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 不能讲fragmentTransaction 设为全局变量。否则会报commit has already execute!