viewpager.setCurrretntItem() 在按钮 onClickListener

Question

我是 android 应用程序开发的新手，我目前正在开发一个具有带有 TabBarLayout 的 NavigationDrawer 的项目。 我的问题是我有一个由两个按钮登录和注册组成的片段：

 lgn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                fragmentManager=getActivity().getSupportFragmentManager();
                fragmentTransaction=fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.containerView,new TabFragment()).addToBackStack(null).commit();
            }
        });

        rgst.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                fragmentManager=getActivity().getSupportFragmentManager();
                fragmentTransaction=fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.containerView,new TabFragment()).addToBackStack(null).commit();
            }
        });

现在如果我点击登录或注册按钮标签栏布局打开。 现在我希望如果我点击登录按钮，登录片段显示在标签栏布局中，如果我点击注册按钮，注册片段在标签栏中打开。

我也在谷歌上搜索并找到viewpager.setCurrentItem但我无法使用它来满足我的要求

我是这样用的

public class TabFragment extends Fragment {

    public static TabLayout tabLayout;
    public static ViewPager viewPager;
    public static int int_items = 2 ;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View x=inflater.inflate(R.layout.tab_layout,null);

        tabLayout=(TabLayout)x.findViewById(R.id.tabs);
        viewPager=(ViewPager)x.findViewById(R.id.viewpager);

        viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));

        viewPager.setCurrentItem(1); //here i am unable to decide how to open specific fragment

        tabLayout.post(new Runnable() {
            @Override
            public void run() {

                tabLayout.setupWithViewPager(viewPager);
            }
        });
        return x;
    }
    class MyAdapter extends FragmentPagerAdapter{

        public MyAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            switch (position)
            {
                case 0: return new Login();
                case 1: return new Registration();

            }

            return null;
        }

        @Override
        public int getCount() {
            return int_items;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            switch (position)
            {
                case 0:
                    return "Login";
                case 1:
                    return "Registration";
            }
            return null;
        }
    }

请提示我这样做的一些逻辑...提前谢谢...

Answer 1

通过单击按钮传递布尔值并在 TabFragment 中接收它们。

检查布尔值并设置适当的 viewpager 项：

首先在注册和登录按钮片段中传递值来确定点击了哪个按钮

 lgn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                fragmentManager=getActivity().getSupportFragmentManager();
                Bundle bundle=new Bundle();
                bundle.putBoolean("Register",false);
                TabFragment fragment=new TabFragment();
                fragment.setArguments(bundle);
                fragmentTransaction=fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.containerView,fragment).addToBackStack(null).commit();
            }
        });

        rgst.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {


                fragmentManager=getActivity().getSupportFragmentManager();
                Bundle bundle=new Bundle();
                bundle.putBoolean("Register",true);
                TabFragment fragment=new TabFragment();
                fragment.setArguments(bundle);
                fragmentTransaction=fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.containerView,fragment).addToBackStack(null).commit();
            }
        });

然后在标签栏布局中使用此代码来考虑布尔值是真还是假

 @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        View x=inflater.inflate(R.layout.tab_layout,null);

        tabLayout=(TabLayout)x.findViewById(R.id.tabs);
        viewPager=(ViewPager)x.findViewById(R.id.viewpager);

        viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));


        Bundle bundle=getArguments();
       check=bundle.getBoolean("Register");
        if (check)
        {
            viewPager.setCurrentItem(1);
        }

        tabLayout.post(new Runnable() {
            @Override
            public void run() {

                tabLayout.setupWithViewPager(viewPager);
            }
        });
        return x;
    }