putExtra() and getExtra() ------------>send data from one activity to the other activity.

First activity.................. 

Intent intent = new Intent(First.this, Second.class);
intent.putExtra("keyName", value);

// pass your values and retrieve them in the other Activity using keyName
startActivity(intent);

Second activity ..........................

String data = getIntent().getExtra().getString("keyName","defaultKey");

//the second parameter is optional . If keyName is null then use the `defaultkey` as data. 

...........................OR..................................

Second activity .......................... 

 Bundle intent = getIntent().getExtras();
 if (intent != null) {
   emonth = intent.getString("emonth");
   ezone = intent.getString("ezone");
   ecircle = intent.getString("ecircle");
   esndesu = intent.getString("esndesu");
   ebillgroup = intent.getString("ebillgroup");
   ebook = intent.getString("ebook");
   ecstno = intent.getString("ecstno");
 }