[android-developers] NullPointerException in SharedPreferences Android

[laxman k]

if want full code.see in attachments

<https://lh4.googleusercontent.com/-AdDdpB0vae4/UMMfnnPeOjI/AAAAAAAAAPQ/LxQ1wlyfxb8/s1600/Capture.JPG>

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package laxman.example.androcloud;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TabHost;

public class CloudHome extends TabActivity 
{
 
 @Override
 public void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  final TabHost tabHost = getTabHost();
  tabHost.addTab(tabHost.newTabSpec("tab1")
          .setIndicator("",getResources().getDrawable(R.drawable.cloud1))
          .setContent(new Intent(this, FileUloadDialog.class)));
  tabHost.addTab(tabHost.newTabSpec("tab2")
          .setIndicator("",getResources().getDrawable(R.drawable.sharing))
          .setContent(new Intent(this, AndroCloud.class)));
  tabHost.addTab(tabHost.newTabSpec("tab2")
          .setIndicator("",getResources().getDrawable(R.drawable.activity))
          .setContent(new Intent(this, AndroCloud.class)));
  tabHost.addTab(tabHost.newTabSpec("tab2")
          .setIndicator("",getResources().getDrawable(R.drawable.search))
          .setContent(new Intent(this, AndroCloud.class)));
 }
 
}

package laxman.example.androcloud;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

public class Session {
	
	Context context;
	
	public boolean start(String UserName)
	{
		SharedPreferences pref= context.getSharedPreferences("MyPref",Context.MODE_PRIVATE);
	    SharedPreferences.Editor editor = pref.edit();
		editor.putBoolean("SessionState", true); 
		editor.putString("SessionName", UserName); 
		editor.commit();
		return true;
	}
	public String GetSessionName()
	{   SharedPreferences pref= context.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
		String sessionN=pref.getString("SessionName", null);
		return sessionN;
	}
	public String GetSessionState()
	{   
		SharedPreferences pref= context.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
		String SessionState=pref.getString("SessionState", null);
		
		return SessionState;
	}
	public boolean destroy()
	{
		SharedPreferences pref= context.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
		Editor editor = pref.edit();
		editor.clear();
		editor.commit();
		return true;	
	}
	

}