Main Window(activity)
package com.myproject.testprojectonintent;
import android.app.Activity; 
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
/** the button that I've added in the xml*/
Button startBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_screen);
    /** Get the id of the button from the xml*/
    startBtn = (Button) findViewById(R.id.startBtn);
    startBtn.setOnClickListener( this);
}
@Override
public void onClick(View view) {
    // TODO Auto-generated method stub
    /** make a refernce to store the intent when the view has been clicked*/
    Intent intent;
    /** Make cases according to the number of buttons you have in screen
     * In this case, I've added one.*/
    switch(view.getId()){
    case R.id.startBtn :
        Log.i("btnClick","Start button id is"+view.getId());
        /** Intent should be fired from this activity to the other activity*/
        intent = new Intent(MainActivity.this, ResultActivity.class);
        /** This is useful when you want to get the button that is clicked here on the 
         * destination activity*/
        intent.putExtra("button_click", "Start");
        /** Start the intent*/
        startActivity(intent);
        /*** Use this only when you want to finish your current activity while opening an another one.
         * if this is commented, then this activity will be running in the background.
        ***/
        this.finish();
        break;
    }
}
/*@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main_screen, menu);
    return true;
}*/
}
Second Window(activity)
package com.myproject.testprojectonintent;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class ResultActivity extends Activity implements OnClickListener{
Button resultBtn;
private String _showText;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.result_screen);
    /** Fetched from the MAIN ACTIVITY */
    Bundle bundle = getIntent().getExtras();
    if(bundle!=null){
        _showText = bundle.getString("button_click");
    }
    Log.i("btnClick","button clicked is :"+_showText);
    resultBtn = (Button) findViewById(R.id.resultBtn);
    resultBtn.setOnClickListener(this);
}
@Override
public void onClick(View view) {
    // TODO Auto-generated method stub
    /** make a refernce to store the intent when the view has been clicked*/
    Intent intent;
    /** Make cases according to the number of buttons you have in screen
     * In this case, I've added one.*/
    switch(view.getId()){
    case R.id.resultBtn :
        Log.i("btnClick","Result button is clicked whose id is :"+view.getId());
        /** Intent should be fired from this activity to the other activity*/
        intent = new Intent(ResultActivity.this, MainActivity.class);
        /** Start the intent*/
        startActivity(intent);
        this.finish();
        break;
    }
}   
}
Mainfest
 <activity 
        android:name="com.myproject.testprojectonintent.ResultActivity"
        ></activity>
After working on this I am able to Solve my problem.