Radio button enable errror

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Mobile

Android

hi sir,
i have created two activities in which after clicking on one radio button it should go to second activity.Everything works fine.It goes to the next activity but i got a little problem.After clicking one radio button if i am trying to click another radio button then the first radio button is still showing selected..and all the radio button is showing selected after clicking another or same.
here is my code,
First XML file:activity_main.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android">
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <textview>
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Select Branch"/>

    <radiobutton>
        android:id="@+id/radioIT"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Information Technology"
        android:checked="true" />

    <radiobutton>
        android:id="@+id/radioCS"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Computer Science" />

    <Button
        android:id="@+id/buttonok"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="ok" />

</radiobutton></radiobutton></textview></linearlayout>

Second XML file:sem.Xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android">
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <textview>
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Select Semister" />


    <radiobutton>
        android:id="@+id/radioButton1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Sem 1"
        android:checked="true" />

    <radiobutton>
        android:id="@+id/radioButton2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="sem 2" />

    <radiobutton>
        android:id="@+id/radioButton3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="sem 3" />

    <radiobutton>
        android:id="@+id/radioButton4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="sem 4" />

</radiobutton></radiobutton></radiobutton></radiobutton></textview></linearlayout><pre>

First class File:(MainActivity.java)
<pre>package com.radiobutton;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;

public class MainActivity extends Activity {
	RadioButton search,type;
	Button Ok;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		search = (RadioButton) findViewById(R.id.radioIT);
		type = (RadioButton) findViewById(R.id.radioCS);

		  Ok = (Button) findViewById(R.id.buttonok);
		  Ok.setOnClickListener(new View.OnClickListener() {
		        @Override
		        public void onClick(View v) {
		        if(search.isChecked()){
		            Intent createIntent = new Intent(getApplicationContext(), Semister.class); // <----- START "SEARCH" ACTIVITY
		            startActivity(createIntent);
		            
		            }
		            else
		            {
		              if(type.isChecked())
		              {
		              Intent typeIntent = new Intent(getApplicationContext(), Semister.class); // <----- START "TYPE ENTRIES OUT" ACTIVITY
		              startActivity(typeIntent);
		              }
		            }
		        }
		    });
	}


}

second class file:(Semister.java)

package com.radiobutton;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;

public class MainActivity extends Activity {
	RadioButton search,type;
	Button Ok;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		search = (RadioButton) findViewById(R.id.radioIT);
		type = (RadioButton) findViewById(R.id.radioCS);

		  Ok = (Button) findViewById(R.id.buttonok);
		  Ok.setOnClickListener(new View.OnClickListener() {
		        @Override
		        public void onClick(View v) {
		        if(search.isChecked()){
		            Intent createIntent = new Intent(getApplicationContext(), Semister.class); // <----- START "SEARCH" ACTIVITY
		            startActivity(createIntent);
		            
		            }
		            else
		            {
		              if(type.isChecked())
		              {
		              Intent typeIntent = new Intent(getApplicationContext(), Semister.class); // <----- START "TYPE ENTRIES OUT" ACTIVITY
		              startActivity(typeIntent);
		              }
		            }
		        }
		    });
	}


}