Android 2 activities and pass datas

Question

I have a problem with my app android. I new in this, and i'm learning. I have 2 activities, first call the second activity and in this activity i add string, and i want see this new string in the first activity, I try with this code

protected void onStart() {
    Bundle bundle = getIntent().getExtras();
    paises.add(bundle.getString("Pais"));
    Log.i("pais", bundle.getString("Pais"));
    habitantes.add(bundle.getString("Habitantes"));

    super.onStart();
}

I try with OnCreate, OnResume and my app close, anyone can help me?

In the second activity I put this code

Intent i = new Intent(this, MainActivity.class);
i.putExtra("Pais", pa);
i.putExtra("Habitantes", ha);

EDIT: Is a simple app, in the first activity i have a arrayList, and i want in another activity add to this arrayLista a string, but when i turn to the first activity the arraylist don't update :S

Bene · Answer 1 · 2014-10-25T11:43:31.507

1

Try this:

Intent i = new Intent(this, MainActivity.class);
Bundle args = new Bundle();
args.putString("Pais", pa);
args.putString("Habitantes", ha);
i.putExtras(args);

edited Oct 25 '14 at 11:43

answered Oct 25 '14 at 10:58

Bene

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Description Resource Path Location Type The method putExtra(String, String) is undefined for the type Bundle anyadirPais.java – sdelcueto Oct 25 '14 at 11:04
Sorry, meant putString(); – Bene Oct 25 '14 at 11:43
I try to put this and Alex says and nothing :-( – sdelcueto Oct 25 '14 at 11:53

score 1 · Answer 2 · answered Oct 25 '14 at 11:00

1

You have to call super.onStart() first thing.

void onStart(Bundle savedState) {
   super.onStart(savedState);
   // your code here .....
}

same for onResume and onCreate

answered Oct 25 '14 at 11:00

Alexander Kulyakhtin

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With OnResume my app crash, and with onresume never enter... what is the method that i can put?? – sdelcueto Oct 25 '14 at 11:08
onCreate. First call super.onCreate then put in your stuff – Alexander Kulyakhtin Oct 25 '14 at 11:15
I cant put in OnCreate because, is the second activity who call the first with a new data. – sdelcueto Oct 25 '14 at 11:45

score 0 · Answer 3 · answered Oct 25 '14 at 12:21

It works, ty Alex and Bene, the right form is a mix with you ^^

The first activity onCreate

 if (getIntent().getExtras() != null){
        Bundle bundle = getIntent().getExtras();
        paises.add(bundle.getString("Pais"));
        habitantes.add(bundle.getString("Habitantes"));
    }

The second activity

Intent i = new Intent(this, MainActivity.class);
Bundle args = new Bundle();
args.putString("Pais", pa);
args.putString("Habitantes", ha);
i.putExtras(args);
startActivity(i)

Android 2 activities and pass datas

3 Answers3