Using a variable from one class in a different class: Java [duplicate]

Question

While working in Android Dev Studio, I have been working on two classes, MainActivity and Main2Activity.

MainActivity

public class MainActivity extends AppCompatActivity { public static final String EXTRA_MESSAGE = ".com.company.name.practiceapp.MESSAGE"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void sendMessage(View view) { Intent intent = new Intent(this, Main2Activity.class); EditText editText = (EditText) findViewById(R.id.editText); String message = editText.getText().toString(); intent.putExtra(EXTRA_MESSAGE, message); startActivity(intent); } }

How would I go about using the String message in Main2Activity?

note: I browsed through many other similar questions but none of the answers said how to use it. The class is public (as you can see), so I couldn't figure out why I couldn't use message.

Curio · Accepted Answer · 2017-06-13 18:23:24Z

Intent intent = getIntent(); String text = intent.getStringExtra(".com.company.name.practiceapp.MESSAGE");

Original answer: https://stackoverflow.com/a/4233898/7339411

luckyhandler · Accepted Answer · 2017-06-13 18:28:39Z

In your second activity in onCreate you do the following:

 Intent intent = getIntent(); Bundle bundle = intent.getExtras(); String variable = bundle.getString(EXTRA_MESSAGE);

You can also specify a default value like:

 String variable = bundle.getString(EXTRA_MESSAGE, "");

Kevin Lee · Accepted Answer · 2017-06-13 18:29:29Z

Since you sent over the message already through an intent extra, you can retrieve it by referencing the intent in Main2Activity:

Intent intent = getIntent(); String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);

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