How to use putExtra() and getExtra() for string data

Use this to "put" the file...

Intent i = new Intent(FirstScreen.this, SecondScreen.class);   
String strName = null;
i.putExtra("STRING_I_NEED", strName);

Then, to retrieve the value try something like:

String newString;
if (savedInstanceState == null) {
    Bundle extras = getIntent().getExtras();
    if(extras == null) {
        newString= null;
    } else {
        newString= extras.getString("STRING_I_NEED");
    }
} else {
    newString= (String) savedInstanceState.getSerializable("STRING_I_NEED");
}

first Screen.java

text=(TextView)findViewById(R.id.tv1);
edit=(EditText)findViewById(R.id.edit);
button=(Button)findViewById(R.id.bt1);

button.setOnClickListener(new OnClickListener() {
    public void onClick(View arg0) {
        String s=edit.getText().toString();

        Intent ii=new Intent(MainActivity.this, newclass.class);
        ii.putExtra("name", s);
        startActivity(ii);
    }
});

Second Screen.java

public class newclass extends Activity
{
    private TextView Textv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.intent);
        Textv = (TextView)findViewById(R.id.tv2);
        Intent iin= getIntent();
        Bundle b = iin.getExtras();

        if(b!=null)
        {
            String j =(String) b.get("name");
            Textv.setText(j);
        }
    }
}

Best Method...

SendingActivity

Intent intent = new Intent(SendingActivity.this, RecievingActivity.class);
intent.putExtra("keyName", value);  // pass your values and retrieve them in the other Activity using keyName
startActivity(intent);

RecievingActivity

 Bundle extras = intent.getExtras();
    if(extras != null)
    String data = extras.getString("keyName"); // retrieve the data using keyName 

/// shortest way to recieve data..

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

//This requires api 12. //the second parameter is optional . If keyName is null then use the defaultkey as data.