T 有两个 Activity:MainActivity 和 LoginActivity。我也有一个 Fragment，名称是 TabFragment(带有 TabLayout)，它的父级是 MainActivity。我如何从我的登录 Activity 中进入特定的 TabFragment。

这是我的主要 Activity :

 protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        id = getIntent().getStringExtra("id");


        if (savedInstanceState == null) {
     getSupportFragmentManager().beginTransaction().replace(R.id.confrag, new FragmentUtama()).commit();
            getSupportFragmentManager().beginTransaction().replace(R.id.confrag, new TabFragment()).commit();
        }
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        sharedPreferences = getSharedPreferences("login.conf", MODE_PRIVATE);
        editor = sharedPreferences.edit();
        String username = sharedPreferences.getString("username", "");
        String password = sharedPreferences.getString("password", "");
        Log.d(TAG, "Username:"+username+"\npassword:"+password);


        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

    }

这是我的标签 fragment :

  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.viewpager, null);

        tabLayout = (TabLayout)view.findViewById(R.id.tabs);
        viewPager = (ViewPager)view.findViewById(R.id.viewpager);
        viewPager.setAdapter(new Adapterbaru(getChildFragmentManager()));
         tabLayout.post(new Runnable() {
            @Override
            public void run() {
                tabLayout.setupWithViewPager(viewPager);
            }
        });
        Long tsLong = System.currentTimeMillis()/1000;
        String ts = tsLong.toString();


        return view;
    }

    public interface OnFragmentInteractionListener {

        void onFragmentInteraction(Uri uri);
    }
    public class Adapterbaru extends FragmentPagerAdapter{
        public Adapterbaru(FragmentManager fm){
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            switch (position){
                case 0 : {
                    return new Fragmentone();
                }
                case 1 : {
                    return new FragmentTwo();

                }
                case 2 : {
                    return new Fragmenttree();

                }
            }
            return null;
        }

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

        @Override
        public CharSequence getPageTitle(int position) {
            switch(position){
                case 0 : {
                    return "First";

                }
                case 1 : {
                    return "Second";

                }
                case 2 : {
                    return "Third";
                }
            }
            return null;
        }

最佳答案

1. 从您的 LoginActivity，将选项卡 fragment (FragmentOne, FragmentTwo, FragmentThree) id 作为 0, 1, 2 通过 Intent。

   Intent intent  = new Intent(LoginActivity.this, MainActivity.class);
   intent.putExtra("FRAGMENT_ID", 0);
   startActivity(intent);
   

2. 在您的 MainActivity 中，从 Intent

   获取 fragment ID

   // Inside OnCreate()
   int fragmentId = getIntent().getIntExtra("FRAGMENT_ID", 0);
   

3. 从 MainActivity，使用 FragmentManager 显示 TabFragment 并传递 fragmentId 使用 Bundle

   到 TabFragment

   // Inside OnCreate()
   Bundle bundle = new Bundle();
   bundle.putString("TARGET_FRAGMENT_ID", fragmentId);
   TabFragment tabFragment = new TabFragment();
   tabFragment.setArguments(bundle);
   
   getSupportFragmentManager().beginTransaction().replace(R.id.confrag, tabFragment).commit();
   

4. 在 TabFragment 中，从 Bundle 获取目标 fragment (FragmentOne, FragmentTwo, FragmentThree) id最后使用 ViewPager.setCurrentItem(POSITION) 方法显示所需的 fragment 。

   // Inside OnCreateView()
   int position = getArguments().getInt("TARGET_FRAGMENT_ID"); 
   viewpager.setCurrentItem(position);
   

希望对你有帮助~

关于android - 如何 Intent 进入特定的标签 fragment ？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43178728/