Replace viewPager content with simple textfield?

I am new to Android development and am struggling a bit with sliding tab layouts / view pagers.

I would like to replace the content of my viewPager, which currently contains a table, with a simple textview whose value changes based on the tab selected.

I understand this may also entail putting a new fragment into the view, but I am also at a bit of a loss for how to do so. Any help / input would be greatly appreciated!

My class:

public class SecurityActivity extends BaseActivity implements DevicesFragment.OnFragmentInteractionListener {
    private static final int NUM_TABS = 4;
    DevicesFragmentAdapter fragmentAdapter;
    ViewPager viewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_security);
        setTitle(R.string.security_activity_title);

        fragmentAdapter = new DevicesFragmentAdapter(getSupportFragmentManager());
        viewPager = (ViewPager) findViewById(R.id.pager);
        viewPager.setAdapter(fragmentAdapter);

        SlidingTabLayout stl = (SlidingTabLayout) findViewById(R.id.sliding_tabs);
        stl.setCustomTabView(R.layout.tab_devices, R.id.tab_title);
        stl.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
            @Override
            public int getIndicatorColor(int position) {
                int color;
                switch (position) {
                    case 0:
                        color = ContextCompat.getColor(SecurityActivity.this, R.color.blue);
                        break;
                    case 1:
                        color = ContextCompat.getColor(SecurityActivity.this, R.color.green);
                        break;
                    case 2:
                        color = ContextCompat.getColor(SecurityActivity.this, R.color.yellow);
                        break;
                    case 3:
                        color = ContextCompat.getColor(SecurityActivity.this, R.color.orange);
                        break;
                    default:
                        color = ContextCompat.getColor(SecurityActivity.this, R.color.blue);
                }
                return color;
            }

            @Override
            public int getDividerColor(int position) {
                return ContextCompat.getColor(SecurityActivity.this, R.color.blue);
            }
        });

        stl.setViewPager(viewPager);
    }

    public void onFragmentInteraction(Uri uri) {

    }

    public class DevicesFragmentAdapter extends FragmentPagerAdapter {
        public DevicesFragmentAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            String title;
            switch (position) {
                case 0:
                    title = getString(R.string.security_level_0);
                    break;
                case 1:
                    title = getString(R.string.security_level_1);
                    break;
                case 2:
                    title = getString(R.string.security_level_2);
                    break;
                case 3:
                    title = getString(R.string.security_level_3);
                    break;
                default:
                    title = "";
            }

            return title;
        }

        @Override
        public Fragment getItem(int position) {
            ProtectedDevice.Type targetType = ProtectedDevice.Type.fromRawValue(position);
            ProtectedDevice[] devices = getDevicesOfType(targetType);

            DevicesFragment fragment = DevicesFragment.newInstance(null, null);
            DevicesAdapter adapter = new DevicesAdapter(SecurityActivity.this, devices);
            fragment.setListAdapter(adapter);

            return fragment;
        }

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

        private ProtectedDevice[] getDevicesOfType(ProtectedDevice.Type type) {
            ProtectedDevice[] allDevices = SessionManager.getInstance().getDeviceInfo().getProtectedDevices();
            if (type == ProtectedDevice.Type.None) {
                return allDevices;
            }

            ArrayList<ProtectedDevice> result = new ArrayList<>();
            for (ProtectedDevice d: allDevices) {
                if (d.getType() == type) {
                    result.add(d);
                }
            }
            ProtectedDevice[] arr = new ProtectedDevice[result.size()];
            return result.toArray(arr);
        }
    }
}

My layout:

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.xxx.xxx.activity.DevicesActivity"
    android:background="@drawable/bg_gradient">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:src="@drawable/ic_lock" />

    <View
        android:id="@+id/horizontalRule"
        android:layout_width="0dp"
        android:layout_height="2dp"
        android:background="@color/green"
        android:layout_below="@id/imageView"
        android:layout_alignStart="@id/imageView"
        android:layout_alignEnd="@id/imageView"
        android:layout_marginTop="5dp" />

    <com.xxx.xxx.view.SlidingTabLayout
        android:id="@+id/sliding_tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/horizontalRule"
        android:layout_marginTop="10dp" />

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="500dp"
        android:layout_alignParentEnd="true"
        android:layout_below="@+id/sliding_tabs"
        />

</RelativeLayout>