Load an activity inside a fragment with tabHost

I'm starting with android studio reading some things and watching some videos on youtube, basically what I want to do is a calculation program to make my life easier on my service, some simple accounts I've already been able to do (I only got the calculations ), but with some awful layouts.

I discovered this tabHost slide with fragments , and I really liked the result, simple and practical.

I then created from a tutorial this app below that creates the tabs, and by clicking on each one (or using the "slide") it shows me the tab ID, but what I would need would be instead of showing just one text, load another activity and keep the tab for easy access to the others.

I put IF to compare if the ID of the tab is "such", loads "such" activity , until it worked, but in that activity was without the tabs, so I copied the entire tabs from the first activity to that second, and clicking the second tab, I see that it loads the new activity (text only, no colors and layout) but then crashes the app.

I honestly did not understand what I did wrong, I even tried to put a FOR and a WHILE to ensure that it would load only once (I thought I was stuck loading the second activity several times) but nothing has changed ...

Would anyone have any light please?

activity_main.xml

<android.support.v4.app.FragmentTabHost
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent" >




<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <HorizontalScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/horizontalScrollView"
        android:scrollbars="none"
        android:scrollbarSize="0dp">
    <TabWidget
        android:id="@android:id/tabs"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"/>
</HorizontalScrollView>

    <FrameLayout
        android:id="@android:id/tabcontent"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

</LinearLayout>

MainActivity.java

package com.example.tbarata.myapplication;
import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTabHost;

public class MainActivity extends FragmentActivity { private FragmentTabHost mTabHost;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);
    mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
    mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);

    mTabHost.addTab(
            mTabHost.newTabSpec("tab1").setIndicator("Tab 1111", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab2").setIndicator("Tab 2222", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab3").setIndicator("Tab 3333", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab44").setIndicator("Tab 44", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab5").setIndicator("Tab 55", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab6").setIndicator("Tab 66", null),
            FragmentTab.class, null);
}
}

activity_fragment_layout.xml

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
android:background="#eaecee">

<TextView
    android:id="@+id/text"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_vertical|center_horizontal"
    android:text="@string/hello_world"
    android:textAppearance="?android:attr/textAppearanceMedium" />

FragmentTab.java

package com.example.tbarata.myapplication;
import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView;

public class FragmentTab extends Fragment {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.activity_fragment_layout, container, false);
     if (this.getTag() == "tab2") {

            Intent intent = new Intent(getActivity(), fragment_layout2.class);
            startActivity(intent);
                        }
    } else {

        TextView tv = (TextView) v.findViewById(R.id.text);
        tv.setText(this.getTag() + " Content");
    }
    return v;
}
}

and fragment_layout2.java

public class fragment_layout2 extends FragmentActivity {
private FragmentTabHost mTabHost;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_fragment_layout2);
    mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
    mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);

    mTabHost.addTab(
            mTabHost.newTabSpec("tab1").setIndicator("Tab 1111", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab2").setIndicator("Tab 2222", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab3").setIndicator("Tab 3333", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab44").setIndicator("Tab 44", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab5").setIndicator("Tab 55", null),
            FragmentTab.class, null);
    mTabHost.addTab(
            mTabHost.newTabSpec("tab6").setIndicator("Tab 66", null),
            FragmentTab.class, null);

}