How to carryvalues in android

How to carry the values of the activity




Carrying valeues from one class to another calss:
write the following code on the main activity 

package com.example.carryingvalues;

import java.util.ArrayList;

import com.example.codingonandroid.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class Carryingvalues extends Activity implements OnClickListener {
Button navi;
EditText pass,username;
ArrayList<String> ad=new ArrayList<String>();
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pass=(EditText)findViewById(R.id.editText1);
        username=(EditText)findViewById(R.id.editText2);
        navi=(Button)findViewById(R.id.button1);
        navi.setOnClickListener(this);
    }
public void onClick(View v) {
// TODO Auto-generated method stub

String name=pass.getText().toString();
String user=username.getText().toString();
ad.add(user);
ad.add(name);
System.out.println("alist"+ad);

Intent i=new Intent(Carryingvalues.this,Second.class);
i.putStringArrayListExtra("cred", ad);
startActivity(i);

}
}

In Secon class write the following code:

package com.example.carryingvalues;

import java.util.ArrayList;

import android.app.ListActivity;
import android.os.Bundle;

import android.widget.ArrayAdapter;

public class Second extends ListActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);



Bundle b = getIntent().getExtras();
// String ss = b.getString("ed_name");


ArrayList<String> ad=b.getStringArrayList("cred");

setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, ad));


}

}
main.xml should be the following way:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    

        
   
  
    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="30dp"
        android:ems="10"
        android:hint="@string/username"
        android:inputType="textPersonName" />
    <requestFocus />
    
    
    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="42dp"
        android:ems="10"
        android:inputType="textPassword"
        android:hint="@string/password" >
         </EditText>
        
      <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText2"
        android:layout_marginLeft="42dp"
        android:layout_marginTop="22dp"
        android:text="@string/button" />
    

</RelativeLayout>
output :

when you press enter it shows :