intent.putExtra() question

[Bod MacNeil]

I've been reading through This tutorial on www.developer.android.com.  All I need to do is copy the code but I'm having a problem with the code below.   I have no idea what the EXTRA_MESSAGE is for.  Its giving a an error anyway so I'm guessing I must change it to something else?  I was reading something about my package name goes there but that also doesn't work.  Thanks.

 public void sendMessage(View view) {
        Intent intent = new Intent(this, DisplayMessageActivity.class);
        EditText editText = (EditText) findViewById(R.id.edit_message);
        String message = editText.getText().toString();
        intent.putExtra(EXTRA_MESSAGE, message);
        startActivity(intent);

    }

[Tim Moores]

You only need putExtra if you want to pass additional data to the new activity. If not, you can omit it.

[John Joe]

The EXTRA_MESSAGE is the string you need to bring to next activity.

You can write like this

public void sendMessage(View view) {
        Intent intent = new Intent(this, DisplayMessageActivity.class);
        EditText editText = (EditText) findViewById(R.id.edit_message);
        String message = editText.getText().toString();
        intent.putExtra("message", message);
        startActivity(intent);
    }

To get the string message in DisplayMessageActivity, you have to write in this way

String getMessageFromPreviousActivity = getIntent().getStringExtra("message");
Toast.makeText(getApplication(),getMessageFromPreviousActivity,Toast.LENGTH_SHORT).show(); //display the message

[Giovanni Montano]

OP consider that in real life scenario( but even simple tutorials) you could like to use as well onActivityResult   onActivityResult

[Sami Kassoum]

Have you declared EXTRA_MESSAGE ? It has to be a variable of type string, or you should include it inside of quotes "EXTRA_MESSAGE" , then you will not get the compilation error