Passing data using Intents

package com.example.callingintent;

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 MainActivity extends Activity {
   
    public String name;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    protected static final int REQUEST_CODE = 0;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EditText edt1 = (EditText) findViewById(R.id.editText1);
        Button button1 = (Button) findViewById(R.id.button1);
        EditText et1 = (EditText) findViewById(R.id.editText1);
        et1.setText(getName());
        button1.setOnClickListener(new OnClickListener() {
           
            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
               
                Intent myintent = new Intent(MainActivity.this,secondActivity.class);
                myintent.putExtra("name", "namratha");
                myintent.putExtra("Id", 1);
                //startActivity(myintent);
                startActivityForResult(myintent, REQUEST_CODE);
            }
        });
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        String returnString;
           if (resultCode == RESULT_OK && requestCode == REQUEST_CODE) {
              if (data.hasExtra("returnString1")) {
                 returnString = data.getExtras().getString("returnString1");
                 System.out.println("return string is   "+returnString);
                 setName(returnString);
                
            }
           }
       
       
       
    }

 
}


package com.example.callingintent;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.EditText;

public class secondActivity extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second);
        EditText et1 = (EditText) findViewById(R.id.editText1);
        EditText et2 = (EditText) findViewById(R.id.editText2);
        Bundle mydata = getIntent().getExtras();
        if(mydata!=null)
        {
            String name = mydata.getString("name");
            int id =mydata.getInt("Id");
            System.out.println("id is "+id);
           
            et1.setText(name);
            //et1.setText(id);
       
        }
       
    }       
       
        public void finish() {
            Intent data = new Intent();
           
            data.putExtra("returnString1", "Message to parent activity");
            setResult(RESULT_OK, data);
            super.finish();
       
       
    }

}

Activity_main.xml

<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" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world"
        tools:context=".MainActivity" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="44dp"
        android:text="Button" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_marginTop="33dp"
        android:layout_toLeftOf="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

</RelativeLayout>

Second.xml

<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" >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="Hello Second Activity"

        tools:context=".MainActivity" />

    <EditText

        android:id="@+id/editText1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="36dp"

        android:layout_marginTop="36dp"

        android:ems="10" >

        <requestFocus />

    </EditText>

    <EditText

        android:id="@+id/editText2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/editText1"

        android:layout_below="@+id/editText1"

        android:layout_marginLeft="21dp"

        android:layout_marginTop="20dp"

        android:ems="10" />

</RelativeLayout>