Pass data between Activitys before start the new activity

Question

I am trying to pass some data to another activity, but I need pass the data when I click in a button , but not start the new activity and when i have multiple past data, launch the new activity and see all the content that I have passed before.

The process is similar to a shopping cart, add products and then another activity you see the list of the cart.

I have been trying with SharePrerences, but I only pass one data.

final SharedPreferences mSettings = this.getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = mSettings.edit();    
editor.putString(NOMBRE_TAG, tvNotas.getText().toString());
editor.putString(PRECIO_TAG, pantalla.getText()+"");
editor.commit();

with putExtra I do not think it works, because I dont know how much data I will pass

Intent intent = new Intent(this, NAME.class);
intent.putextra("SOMETHING","value");
startActivity(intent);
String data = getIntent().getExtras().getString("SOMETHING");

And i dont know other forms to do it.

The process is similar like

You should know the data you pass in order to move or trigger the new activity. Only you knows that its over and so can tell the activity to be launched. — sjain, Apr 24 '14 at 11:47

score 0 · Accepted Answer · edited May 23 '17 at 12:28

0

when you use shared preference every "key" like your tags(NOMBRE_TAG,PRECIO_TAG) will save only one item. which mean, everytime you save item with this keys it will replace the old items.

i recommender using SQLITE database.

here some example how to start:

Android SQLite Example

edited May 23 '17 at 12:28

Community

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answered Apr 24 '14 at 11:24

SacreDeveloper

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score 0 · Answer 2 · answered Apr 25 '14 at 06:30

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You could use a static class, or singleton? This way you can put whatever you want in it from the first activity and retrieve it from the second activity. The only drawback is that it will not survive an application restart.

answered Apr 25 '14 at 06:30

Arno van Lieshout

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sjain · Answer 3 · 2014-04-24T11:39:45.433

Use putParcelableArrayList to pass all the data as a array list ---

    @Override
    public void onSaveInstanceState(final Bundle outState) {
    outState.putParcelableArrayList("data", myData);
    super.onSaveInstanceState(outState);
    }

Then to get this data just use ----

ArrayList<String> myData = new ArrayList<String>();

@Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) 
   {
        super.onCreateView(inflater, container, savedInstanceState);

        if (savedInstanceState != null) {

            try
            {
               myData = savedInstanceState.getParcelableArrayList("data");
            }

        }

        myData.add(0, tvNotas.getText().toString());
        myData.add(1, pantalla.getText()+"");
    }

You put data in shared preferences and get it from saveInstanceState? WTF? — Ilya Demidov, Apr 24 '14 at 11:36
@IlyaDemidov - Sorry, don't bother. Was a quick mistake. Thanks. — sjain, Apr 24 '14 at 11:40

Pass data between Activitys before start the new activity

3 Answers3