title: new intent null pointer exception in an Activity
body: <p>Im trying to build a chat application using facebook login. login part in working fine .The problem i'm facing is , When i want to move to new activity im facing an null pointer exception, i'm using socket.io. PLease help me. Thaks in advance.</p>
  
  <pre><code>public class Second extends Activity {
       static SocketIO socket;
       Object data;
          int t = 0;
       Singleton tmp = Singleton.getInstance();
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
      System.out.println("second activity enntered");
      setContentView(R.layout.activity_second);
      final TextView tv = (TextView) findViewById(R.id.textView1);
      System.out.println(getIntent().getExtras().getString("name")+"secondactivity");
      tv.setText("Welcome"+getIntent().getExtras().getString("name"));
  
  final Button bt1 = (Button) findViewById(R.id.button1);
  final Button bt2 = (Button) findViewById(R.id.button2);
  final EditText et = (EditText) findViewById(R.id.editText1);
  bt1.setOnClickListener(new OnClickListener() {
  
      public void onClick(View v) {
          // TODO Auto-generated method stub
  
                  if(bt1.getText().equals("Create Room"))
                  {
              System.out.println(bt1.getText());
  
          et.setVisibility(View.VISIBLE);
          bt2.setVisibility(View.VISIBLE);
          bt1.setText("Cancel Room");
                  }
          else    if(bt1.getText().equals("Cancel Room"))
          {
              System.out.println(bt1.getText());
  
              et.setVisibility(View.INVISIBLE);
              bt2.setVisibility(View.INVISIBLE);
              bt1.setText("Create Room");
          }
  
      }
  });
  bt2.setOnClickListener(new OnClickListener() {
  
      public void onClick(View v) {
          // TODO Auto-generated method stub
          JSONObject b = new JSONObject();
          try {
              b.put("creator", getIntent().getExtras().getString("name"));
          } catch (JSONException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
          try {
              b.put("roomName", et.getText()) ;
          } catch (JSONException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }   
          tmp.emit("createroom", b);
  
  }
  });
  
  }
  
  public void setData(Object[] args) {
      // TODO Auto-generated method stub
  System.out.println(args[0]);
      data = args[0];
       t = 1;
      System.out.println(Second.this);
  
  
               Intent inte = null;
               System.out.println(inte+"asdasdasdasdasdasdsa");
               System.out.println(new Intent(Second.this,Ownroom.class));
               inte= new Intent(Second.this,Ownroom.class);
  
                inte.putExtra("json",data.toString() );
                startActivity(inte);
  
  
  }
  }
  </code></pre>
  
  <p>LogCat is </p>
  
  <pre><code>07-14 16:20:52.050: I/System.out(2353): com.example.lastapp1.Second@40f6b508
  07-14 16:20:52.060: I/System.out(2353): nullasdasdasdasdasdasdsa
  07-14 16:20:52.070: W/System.err(2353): io.socket.SocketIOException: Exception was thrown in on(String, JSONObject[]).
  07-14 16:20:52.070: W/System.err(2353): Message was: 5:::{"name":"receiveroom","args":[{"roomName":"kj","roomId":"be72be30-0b44-11e4-9f8c-4706467ac6c0","creator":"Saikrishna Rangineni","listofusers":["Saikrishna Rangineni"]}]}
  07-14 16:20:52.080: W/System.err(2353):     at io.socket.IOConnection.transportMessage(IOConnection.java:700)
  07-14 16:20:52.090: W/System.err(2353):     at io.socket.WebsocketTransport.onMessage(WebsocketTransport.java:82)
  07-14 16:20:52.090: W/System.err(2353):     at org.java_websocket.client.WebSocketClient.onWebsocketMessage(WebSocketClient.java:361)
  07-14 16:20:52.090: W/System.err(2353):     at org.java_websocket.WebSocketImpl.deliverMessage(WebSocketImpl.java:565)
  07-14 16:20:52.100: W/System.err(2353):     at org.java_websocket.WebSocketImpl.decodeFrames(WebSocketImpl.java:331)
  07-14 16:20:52.100: W/System.err(2353):     at org.java_websocket.WebSocketImpl.decode(WebSocketImpl.java:152)
  07-14 16:20:52.120: W/System.err(2353):     at org.java_websocket.client.WebSocketClient.interruptableRun(WebSocketClient.java:247)
  07-14 16:20:52.120: W/System.err(2353):     at org.java_websocket.client.WebSocketClient.run(WebSocketClient.java:193)
  07-14 16:20:52.130: W/System.err(2353):     at java.lang.Thread.run(Thread.java:856)
  07-14 16:20:52.130: W/System.err(2353): Caused by: java.lang.NullPointerException
  07-14 16:20:52.140: W/System.err(2353):     at android.content.ContextWrapper.getPackageName(ContextWrapper.java:127)
  07-14 16:20:52.150: W/System.err(2353):     at android.content.ComponentName.&lt;init&gt;(ComponentName.java:75)
  07-14 16:20:52.150: W/System.err(2353):     at android.content.Intent.&lt;init&gt;(Intent.java:3122)
  07-14 16:20:52.150: W/System.err(2353):     at com.example.lastapp1.Second.setData(Second.java:104)
  07-14 16:20:52.160: W/System.err(2353):     at com.example.server.Singleton$1.on(Singleton.java:71)
  07-14 16:20:52.160: W/System.err(2353):     at io.socket.IOConnection.on(IOConnection.java:907)
  07-14 16:20:52.170: W/System.err(2353):     at io.socket.IOConnection.transportMessage(IOConnection.java:697)
  07-14 16:20:52.170: W/System.err(2353):     ... 8 more
  </code></pre>
  
  <p>Ownroom code </p>
  
  <pre><code>  package com.example.lastapp1;
  
  import io.socket.IOAcknowledge;
  import io.socket.IOCallback;
  import io.socket.SocketIO;
  import io.socket.SocketIOException;
  
  import java.security.NoSuchAlgorithmException;
  
  import javax.net.ssl.SSLContext;
  
  import org.json.JSONException;
  import org.json.JSONObject;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.widget.Button;
  import android.widget.EditText;
  import android.widget.TextView;
  
  public class Ownroom extends Activity {
  SocketIO socket;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_ownroom);
          Button bt1 = (Button) findViewById(R.id.button3);
          final EditText et = (EditText) findViewById(R.id.editText1);
          final TextView tv = (TextView) findViewById(R.id.textView1);
          //System.out.println(getIntent().getExtras().get);
          try {
              final JSONObject obj = new JSONObject(getIntent().getStringExtra("json"));
  
  
  
      tv.setText("Welcome to "+obj.get("roomName")+"room");
  
        bt1.setOnClickListener(new OnClickListener() {
  
          @Override
          public void onClick(View v) {
              System.out.println("helllo in click");
              // TODO Auto-generated method stub
              JSONObject a = new JSONObject();
              try {
                  a.put("message", et.getText());
              } catch (JSONException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
              try {
                  a.put("name", obj.get("creator"));
              } catch (JSONException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
              try {
                  a.put("roomName",  obj.get("roomName"));
              } catch (JSONException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
              try {
                  a.put("roomId",  obj.get("roomId"));
              } catch (JSONException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
              System.out.println(obj+"in click");
              socket.emit("send message",a );
                  }
      });
          } catch (JSONException e2) {
              // TODO Auto-generated catch block
              e2.printStackTrace();
      }
      }
  }
  </code></pre>
  
  <p>Single ton class</p>
  
  <pre><code>package com.example.server;
  
  import io.socket.IOAcknowledge;
  import io.socket.IOCallback;
  import io.socket.SocketIO;
  import io.socket.SocketIOException;
  
  import java.net.Socket;
  import java.security.NoSuchAlgorithmException;
  
  import javax.net.ssl.SSLContext;
  
  import org.json.JSONObject;
  
  import com.example.lastapp1.MainActivity;
  import com.example.lastapp1.MainActivity.MainFragment;
  import com.example.lastapp1.Second;
  
  import android.content.Intent;
  import android.sax.StartElementListener;
  import android.util.Log;
  
  public class Singleton {
  String name = "No name";
      private static Singleton Single= new Singleton();
      static SocketIO socket;
  
      static MainFragment mianee1 = new MainFragment();
      static Second mianee2 = new Second();
      /* A private Constructor prevents any other 
          * class from instantiating.
          */
         private Singleton (){ }
  
         /* Static 'instance' method */
         public static Singleton getInstance( ) {
  
  
  
              System.out.println("login");
               try {
                      SocketIO.setDefaultSSLSocketFactory(SSLContext.getDefault());
                  } catch (NoSuchAlgorithmException e1) {
                      // TODO Auto-generated catch block
                      e1.printStackTrace();
                  }
          try {
           socket = new SocketIO("http://10.0.2.2:3000/");
          System.out.println("asdasdasd");
          } catch (Exception e) {
          //TODO Auto-generated catch block
          System.out.println(e);
          e.printStackTrace();
          }
  
          socket.connect(new IOCallback() {
  
          public void on(String event, IOAcknowledge ack, Object... args) {
             if ("socket1".equals(event) &amp;&amp; args.length &gt; 0) {
                Log.e("received",""+args[0]);
  
            mianee1.setData(args);
              System.out.println("yes yes yes"+args[0]);
  
  
             }
  
             if ("receiveroom".equals(event) &amp;&amp; args.length &gt; 0) {
                    Log.e("receiveroom",""+args[0]);
  
              //  mianee2.setData(args);
                  System.out.println("received socket from second room"+args[0]);
  
  
                 }
              }
  
          public void onMessage(JSONObject json, IOAcknowledge ack) {
                 System.out.println("Server said:" + json);
          }
          public void onMessage(String data, IOAcknowledge ack) {
                 System.out.println("Server said:" + data);
          }
  
          public void onError(SocketIOException socketIOException) { socketIOException.printStackTrace();}
  
          public void onDisconnect() {
          System.out.println("connected sucesfully");
          }
  
          public void onConnect() {
                 System.out.println("connected");
          }
  
          });
  
             return Single;
  
  
             }
         public void run() {
              // TODO Auto-generated method stub
  
          }
  
  //public static void run() {
  //  
  //
  //   try {
  //          SocketIO.setDefaultSSLSocketFactory(SSLContext.getDefault());
  //      } catch (NoSuchAlgorithmException e1) {
  //          // TODO Auto-generated catch block
  //          e1.printStackTrace();
  //      }
  //try {
  //SocketIO socket = new SocketIO("http://10.0.2.2:3000/");
  //System.out.println("asdasdasd");
  //} catch (Exception e) {
  //// TODO Auto-generated catch block
  //System.out.println(e);
  //e.printStackTrace();
  //}
  //SocketIO socket = null;
  //socket.connect(new IOCallback() {
  //   
  //public void on(String event, IOAcknowledge ack, Object... args) {
  //    if ("socket1".equals(event) &amp;&amp; args.length &gt; 0) {
  //       Log.e("received",""+args[0]);
  //       MainFragment mai = new MainFragment();
  //       mai.nextActvity(args[0]);
  //    }
  //}
  //
  //public void onMessage(JSONObject json, IOAcknowledge ack) {
  //     System.out.println("Server said:" + json);
  //}
  //public void onMessage(String data, IOAcknowledge ack) {
  //     System.out.println("Server said:" + data);
  //}
  //
  //public void onError(SocketIOException socketIOException) { socketIOException.printStackTrace();}
  //
  //public void onDisconnect() {
  //System.out.println("connected sucesfully");
  //}
  //
  //public void onConnect() {
  //     System.out.println("connected");
  //}
  //});
  //}
  
  
  public void setName(String a)
  {
       name = a;
  
  }
  public String getname() {
      return name;
  
  }
  
  public void emit(String string, String abc) {
      // TODO Auto-generated method stub
      socket.emit(string,abc);
  }
  
  public void emit(String string, JSONObject b) {
      // TODO Auto-generated method stub
      socket.emit(string,b);
  
  }
  
  }
  </code></pre>