Android, Can I use putExtra to pass multiple values

Question

You could pass a 'bundle' of extras rather than individual extras if you like, for example:-

Intent intent = new Intent(this, MyActivity.class);
Bundle extras = new Bundle();
extras.putString("EXTRA_USERNAME","my_username");
extras.putString("EXTRA_PASSWORD","my_password");
intent.putExtras(extras);
startActivity(intent);

Then in your Activity that your triggering, you can reference these like so:-

Intent intent = getIntent();
Bundle extras = intent.getExtras();
String username_string = extras.getString("EXTRA_USERNAME");
String password_string = extras.getString("EXTRA_PASSWORD");

Or (if you prefer):-

Bundle extras = getIntent().getExtras();
String username_string = extras.getString("EXTRA_USERNAME");
String password_string = extras.getString("EXTRA_PASSWORD");

Hope this helps! :-)

You can pass multiple values by using multiple keys. Instead of

i.putExtra(ID_EXTRA, "1", "111");

do

i.putExtra(ID_EXTRA1, "1");
i.putExtra(ID_EXTRA2, "111");

Of course you have to define 2 constants for the keys and have to read both seperately in the new activity.

Or you can pass a string array via

i.putExtra(ID_EXTRA, new String[] { "1", "111"});

Putting extra values in class

public class MainActivity extends Activity {
        public final static String USERNAME = "com.example.myfirstapp.MESSAGE";
        public final static String EMAIL = "com.example.myfirstapp.EMAIL";

public void registerUser(View view) {
        Intent intent = new Intent(this, DisplayMessageActivity.class);
        EditText userNameTxt = (EditText) findViewById(R.id.editText1);
        EditText emailTxt = (EditText) findViewById(R.id.editText2);
        String userName = userNameTxt.getText().toString();
        String email = emailTxt.getText().toString();
        intent.putExtra(USERNAME, userName);
        intent.putExtra(EMAIL,email);
        startActivity(intent);

    }

Reading extra values from another class

public class DisplayMessageActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent intent = getIntent();
        String user = intent.getStringExtra(MainActivity.USERNAME);
        String email = intent.getStringExtra(MainActivity.EMAIL);   

No you can't but you can pass an array using:

public Intent putExtra (String name, String[] value)

like this for example:

i.putExtra(ID_EXTRA, new String[]{"1", "111"});