Passing intents

Question

I'm a newb at Java, but know python.

I put an EditText in my xml, with a number input type. When someone inputs a number, I want it to get multiplied by, say, 80

this is my main activity code

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);

then the displaymessage activity:

Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
int ma = Integer.parseInt(message.trim());
int result = ma * 80;

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



    TextView textView = new TextView(this);
    textView.setTextSize(40);
    textView.setText(result);


    setContentView(textView);
}

When input a number and send the messagem the app crashes.

http://stackoverflow.com/questions/23353173/unfortunately-myapp-has-stopped-how-can-i-solve-this — Kevin Coppock, Aug 14 '14 at 23:58
well comrade im a newb so if you please tell me how else i could ... :3 — the_override, Aug 15 '14 at 00:00
According to the code I'm not clear what you try to do here. ... ? — Zusee Weekin, Aug 15 '14 at 00:07
yes, just for now, as a test, or say an idea of how to do it later — the_override, Aug 15 '14 at 00:07
zussee im trying to mutliply an integer by and interger and have it display on another activity — the_override, Aug 15 '14 at 00:08
@BenKogos Please post the exact error message as well as your complete code. You have left out the class names which makes the code you have given incomplete. — Code-Apprentice, Aug 15 '14 at 01:22

Code-Apprentice · Answer 1 · 2014-08-15T01:22:23.647

0

Intent intent = getIntent();

I assume this is a member variable. Calling getIntent() at this point in your code is an error. You should move this and the rest of your member variables to onCreate().

Further reading:

Starting Another Activity

The Activity Lifecycle

edited Aug 15 '14 at 01:22

answered Aug 15 '14 at 00:02

Code-Apprentice

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ok memeber variable. pls explain to said newb. I thought to put it oustide onCreate() so it can always be present, not only when the activity is started – the_override Aug 15 '14 at 00:10
@BenKogos Why do you need it to always be present? Are there other methods that need to use this variable? – Code-Apprentice Aug 15 '14 at 01:20
@BenKogos I also suggest that you read a good Java tutorial that explains the basics of classes. – Code-Apprentice Aug 15 '14 at 01:22

Passing intents

1 Answers1