使用选项卡布局从活动中启动选项卡片段

Question

我有一个标签片段应用程序。问题是，当我进入我的应用程序内的活动并想要返回我的标签布局时，它返回没有标签行布局。我只能看到没有上面一行（标签行）的特定片段页面，这使我能够在标签之间导航。你知道我能做些什么来解决它吗？我怎样才能看到标签的行？谢谢你的帮助，

这是我想从活动中看到的第一个标签：

public class Tab1MyProfile extends Fragment  {

   @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.tab1_my_profile, container, false);
        return rootView;
    }
}

这是包含返回片段选项卡的代码的活动：

public class GameLive extends AppCompatActivity implements RecognitionListener {
    private Intent intent;
    private Button mStopButton;

    public void stopGame (View view) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("Are you sure you want to finish the game?")
                .setCancelable(false)
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        FragmentManager fragmentManager = getSupportFragmentManager();
                        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                        Tab1MyProfile fragment = new Tab1MyProfile();
                        fragmentTransaction.replace(android.R.id.content, fragment);
                        fragmentTransaction.commit();
                    }
                })
                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });
        AlertDialog alert = builder.create();
        alert.show();
    }


    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.game_live);
        mStopButton = (Button) findViewById(R.id.btnEndGame);
        mStopButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                stopGame(view);
            }
        });

    }

}

这是包含所有选项卡片段的活动：

public class StartActivity extends AppCompatActivity {

    private SectionsPagerAdapter mSectionsPagerAdapter;
    private ViewPager mViewPager;

    @TargetApi(Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start);

        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());

        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);

        TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
        tabLayout.setupWithViewPager(mViewPager);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_start, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {

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

        @Override
        public Fragment getItem(int position) {
            switch (position) {
                case 0:
                    Tab1MyProfile tab1=new Tab1MyProfile();
                    return tab1;
                case 1:
                    Tab2StartGame tab2=new Tab2StartGame();
                    return tab2;
                case 2:
                    Tab3StatsArea tab3=new Tab3StatsArea();
                    return tab3;
                case 3:
                    Tab4Settings tab4=new Tab4Settings();
                    return tab4;
            }
            return null;
        }

        @Override
        public int getCount() {
            // Show 4 total pages.
            return 4;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            switch (position) {
                case 0:
                    return "My profile";
                case 1:
                    return "Start Game";
                case 2:
                    return "Stats Area";
                case 3:
                    return "Settings";
            }
            return null;
        }
    }


}

再次感谢！