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

Question

Can someone please tell me how exactly to use getExtra() and putExtra() for intents? Actually I have a string variable, say str, which stores some string data. Now, I want to send this data from one activity to another activity.

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

and then in the SecondScreen.java

 public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.table);
        TextView userName = (TextView)findViewById(R.id.userName);
        Bundle bundle = getIntent().getExtras();

        if(bundle.getString("strName")!= null)
        {
            //TODO here get the string stored in the string variable and do 
            // setText() on userName 
        }

    }

I know it is very basic question but unfortunately I am stuck here. Please help.

Thanks,

Edit: Here the string which I am trying to pass from one screen to the other is dynamic. That is I have an editText where I am getting string whatever user types. Then with the help of myEditText.getText().toString() . I am getting the entered value as a string then I have to pass this data.

Answer 1

This is what i have been using, hopfully it helps someone.. simple and affective.

send data

    intent = new Intent(getActivity(), CheckinActivity.class);
    intent.putExtra("mealID", meal.Meald);
    startActivity(intent);

get data

    int mealId;

    Intent intent = getIntent();
    Bundle bundle = intent.getExtras();

    if(bundle != null){
        mealId = bundle.getInt("mealID");
    }

cheers!

Answer 2

put string first

Intent secondIntent = new Intent(this, typeof(SecondActivity));
            secondIntent.PutExtra("message", "Greetings from MainActivity");

retrieve it after that

var message = this.Intent.GetStringExtra("message");

thats All ;)

Answer 3

Android has introduced new methods in Intent class.

• Use hasExtra() for checking if intent has data on key.
• You can use now getStringExtra() directly.

Pass Data

intent.putExtra(USER_NAME, "user");

Get Data

String userName;
if (getIntent().hasExtra(USER_NAME)) {
    userName = getIntent().getStringExtra(USER_NAME);
}

I always put keys in constants for best practice (to avoid manual errors)

public interface PutExtraConstants {
    String USER_NAME = "USER_NAME";
}

Answer 4

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);
        }
    }
}

Answer 5

It is very easy to implement intent in Android.. It takes you to move from one activity to another activity,we have to two method putExtra(); and getExtra();Now I am showing you the example..

    Intent intent = new Intent(activity_registration.this, activity_Login.class);
                intent.putExtra("AnyKeyName", Email.getText().toString());  // pass your values and retrieve them in the other Activity using AnyKeyName
                        startActivity(intent);

Now we have to get the value from AnyKeyName parameter,the below mentioned code will help in doing this

       String data = getIntent().getExtras().getString("AnyKeyName");
        textview.setText(data);

We can easily set the receiving value from Intent,wherever we required.

Answer 6

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");
}