TabLayout中的Android片段如何读取自己的索引？

Question

如果我想要显示每个选项卡片段的“页码”，片段如何在TabLayout中告诉自己的索引（与tabLayout.getSelectedTabPosition（）相反，它会返回当前选定选项卡的索引）？

Answer 1

就可以实现，创建片段

public static MyFragment newInstance(int index) { 
    MyFragment fragment = new MyFragment(); 
    Bundle bundle = new Bundle(); 
    bundle.putInteger("index", index); 
    fragment.setArguments(bundle); 
    return fragment; 
} 

@Override 
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) { 
    int index = getArguments().getInteger("index", 0); 
} 

而且在适配器时，通过在位置

@Override 
public Fragment getItem(int position) { 
    // getItem is called to instantiate the fragment for the given page. 
    // Return a PlaceholderFragment (defined as a static inner class below). 
    return MyFragment.newInstance(position + 1); 
}