[Q] Need Help with an application and coding - Android Q&A, Help & Troubleshooting

I have created a new xml file in the res>layout forlder called tabs.xml. It has the following code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
androidrientation="vertical" >
<TabHost
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"
androidrientation="vertical" >
<TabWidget
android:id="@android:id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</TabWidget>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
android:id="@+id/Network"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Channel Type:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<RadioButton
android:id="@+id/urbanButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:text="Urban" />
<RadioButton
android:id="@+id/suburbanButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/urbanButton1"
android:layout_alignBottom="@+id/urbanButton1"
android:layout_centerHorizontal="true"
android:text="SubUrban" />
<RadioButton
android:id="@+id/ruralButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/suburbanButton2"
android:layout_alignBottom="@+id/suburbanButton2"
android:layout_alignParentRight="true"
android:layout_marginRight="15dp"
android:text="Rural" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/urbanButton1"
android:text="Characteristics of Channel:"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignRight="@+id/suburbanButton2"
android:layout_below="@+id/textView2"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView3"
android:layout_toLeftOf="@+id/ruralButton3"
android:text="Manual Override" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/power"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</RelativeLayout>
<RelativeLayout
android:id="@+id/Connectivity"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</RelativeLayout>
<RelativeLayout
android:id="@+id/Offline"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</RelativeLayout>
</FrameLayout>
</LinearLayout>`enter code here`
</TabHost>
</LinearLayout>
Now i also have a andoid activity_main.xml in the same folder which i added nothing to it. i also created a java file called Tabs.Java and put it in the src folder under src>com.example.qosmetre>Tabs.Java with the following code
package com.example.qosmetre;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class Tabs extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tabs);
}
}
Now my question is, when i run my app on the terminal or in debugging mode, how come nothing is showing up but a blank screen? Like i want the tabs to show up first thing with all the stuff underneath them as shown in the code above. Also how would i import a library for scatter plotting data that would be in my app?
I need to know where and what files to put what code in because im just a beginner and i dont know too much so ill need big guidence.
Thanks again in advance.