如何意图进入特定的标签片段？

Question

T 有两个活动：MainActivity 和 LoginActivity。我也有一个Fragment，名字是TabFragment（带有一个TabLayout），它的父级是MainActivity。如何从我的登录活动中进入特定的 TabFragment。

这是我的主要活动：

 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);

    }

这是我的标签片段：

  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;
        }

Answer 1

1. 从您的LoginActivity，将标签片段(FragmentOne, FragmentTwo, FragmentThree) id 作为0, 1, 2 传递到Intent。

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

2. 在您的MainActivity中，从Intent获取片段ID

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

3. 从MainActivity，使用FragmentManager 显示TabFragment，并使用Bundle 将fragmentId 传递给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获取目标片段(FragmentOne, FragmentTwo, FragmentThree) id，最后使用ViewPager.setCurrentItem(POSITION)方法显示想要的片段。

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

希望对你有帮助~

Answer 2

你可以检查为

if(isFromLogin){
  viewpager.setCurrentItem(specificFragmentPosition);
}

编码愉快！

Answer 3

viewpager.setCurrentItem(posotion);

Answer 4

从你的 LoginActivity 传递这样的 Intent

在 LoginActivity.class 中

Intent intent  = new Intent(LoginActivity.this, MainActivity.class);
intent.putExtra("Fragmentone", 0); //pass zero for Fragmentone.
startActivity(intent);

Intent intent  = new Intent(LoginActivity.this, MainActivity.class);
    intent.putExtra("FragmentTwo", 1); //pass zero for FragmentTwo.
    startActivity(intent);

Intent intent  = new Intent(LoginActivity.this, MainActivity.class);
    intent.putExtra("FragmentThree", 2); //pass zero for FragmentThree.
    startActivity(intent);

在 MainActivity.class 中

int value = getIntent().getIntExtra("Fragmentone", 0);

像这样从你的活动通行证

Bundle bundle = new Bundle();
bundle.putString("key", value);
FragmentOne fragmentOne = new FragmentOne();
fragmentOne.setArguments(bundle);

在Fragment的oncreateView里面请定义这个

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    int strtext = getArguments().getInt("key");    
    return inflater.inflate(R.layout.fragment, container, false);
}