调整片段中TextView的文本大小

如何更改片段的TextView的文本大小。我需要它，因为文本大小很小，也许有些用户希望它变大。我知道，有些人建议使用seekbar或点按缩放，但我无法使其片段化。谢谢你的帮助。

我的fragment_one.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="org.aultoon.webovietab.fragments.OneFragment"
android:id="@+id/oneFragmentId"
>



<ScrollView
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fadingEdge="none"
    android:fillViewport="true"
    >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_gravity="top|center"
        android:gravity="center"
        >


<TextView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/tvFragmentOne"
    android:text="@string/turkce1"
    android:textSize="27sp"
    android:textIsSelectable="true"
    android:layout_margin="10dp"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    />

        </RelativeLayout>
</ScrollView>

这是我的OneFragment.java

public class OneFragment extends Fragment {


    //static WebView mWebview;




    public OneFragment() {
        // Required empty public constructor
    }


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

        View rootView = inflater.inflate(R.layout.fragment_one, container, false);

        return rootView;
    }
}

这是我的活动

 public class SimpleTabsActivity extends AppCompatActivity {


    private Toolbar toolbar;
    private TabLayout tabLayout;
    private ViewPager viewPager;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple_tabs);


        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        getSupportActionBar().setDisplayHomeAsUpEnabled(false);

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        setupViewPager(viewPager);

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

    }


    private void setupViewPager(ViewPager viewPager) {
        ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
        adapter.addFragment(new OneFragment(), "tab1");
        adapter.addFragment(new TwoFragment(), "tab2");

        viewPager.setAdapter(adapter);


    }

    class ViewPagerAdapter extends FragmentPagerAdapter {
        private final List<Fragment> mFragmentList = new ArrayList<>();
        private final List<String> mFragmentTitleList = new ArrayList<>();

        public ViewPagerAdapter(FragmentManager manager) {
            super(manager);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragmentList.get(position);
        }

        @Override
        public int getCount() {
            return mFragmentList.size();
        }

        public void addFragment(Fragment fragment, String title) {
            mFragmentList.add(fragment);
            mFragmentTitleList.add(title);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mFragmentTitleList.get(position);
        }
    }







    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case R.id.aboutMenuItem:
                Intent i = new Intent(this, About_Activity.class);
                startActivity(i);
                return true;

            default:
                return super.onOptionsItemSelected(item);
        }
    }


}