保存和恢复片段状态

我有一系列的片段。我使用“上一个”和“下一个”按钮在该片段中进行导航。该片段中有许多编辑文本和单选按钮。

当通过单击“上一个”按钮加载上一个片段时，我想保存和恢复这些编辑文本和单选按钮中的用户输入。

截图：
片段1 https://i.stack.imgur.com/04CbX.jpg

片段2 https://i.stack.imgur.com/HgRq5.jpg

片段1：

public class Register_Page6 extends Fragment {
public Register_Page6() {}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_register_page6, container, false);

    Button Previous = (Button) view.findViewById(R.id.Previous6);
    Button Next = (Button) view.findViewById(R.id.Next6);
    Next.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            android.support.v4.app.FragmentTransaction FT;
            FT = getActivity().getSupportFragmentManager().beginTransaction();
            FT.replace(R.id.main_container,new Register_Page7());
            FT.commit();
        }
    });

    Previous.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            android.support.v4.app.FragmentTransaction FT;
            FT = getActivity().getSupportFragmentManager().beginTransaction();
            FT.replace(R.id.main_container,new Register_Page5());
            FT.commit();
        }
    });
    return view;
}
}

片段2：

public class Register_Page7 extends Fragment {
public Register_Page7(){

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_register_page7, container, false);

    Button Previous = (Button) view.findViewById(R.id.Previous7);
    Button Regiter = (Button) view.findViewById(R.id.Submit);
    Regiter.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
    android.support.v4.app.FragmentTransaction FT;
            FT = getActivity().getSupportFragmentManager().beginTransaction();
            FT.replace(R.id.main_container,new Register_Page6());
            FT.commit();
        }
    });

    Previous.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            android.support.v4.app.FragmentTransaction FT;
            FT = getActivity().getSupportFragmentManager().beginTransaction();
            FT.replace(R.id.main_container,new Register_Page6());
            FT.commit();
        }
    });
    return view;
}
}

使用以下命令将片段添加到后台堆栈addToBackStack("YOUTAG")像这样在你的所有片段中：

android.support.v4.app.FragmentTransaction FT;
FT = getActivity().getSupportFragmentManager().beginTransaction();
FT.replace(R.id.main_container, new Register_Page6()).addToBackStack("FragmentName");
FT.commit();