pass ArrayList> to another activity

Question

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

can i send HoldAllData to another activity using putStringArrayListExtra? i know how to send ArrayList<String> to another activity but this is a list of string list. HoldAllData is filled by database read values and is a n-row by 5-columns list of strings.

no it shouldn't because it is working and holds all database values — Hossein Amini, Jul 07 '14 at 09:46
Of course it works, but that doesn't make it the right practice. See http://stackoverflow.com/questions/9852831/polymorphism-why-use-list-list-new-arraylist-instead-of-arraylist-list-n and http://stackoverflow.com/questions/147468/why-should-the-interface-for-a-java-class-be-prefered — EpicPandaForce, Jul 07 '14 at 09:47
u r wrong, ur code give me error. the correct implementation is: List> HoldAllDatar = new ArrayList>(); — Hossein Amini, Jul 07 '14 at 09:52
You ARE right and wrong at the same time, it should be `List> HoldAllData = new ArrayList>();` sorry about the initial error. — EpicPandaForce, Jul 07 '14 at 09:53

Pr38y · Accepted Answer · 2014-07-07T10:10:54.353

1

Well you can achieve the same by setting data in the bundle through .putSerializable("key", HoldAllData ); then later to retrieve the list in other activity cast the serializable data Object o = bundle.getSerializable("key"); if o instanceof ArrayList<ArrayList<String>> ArrayList<ArrayList<String>> holdAllData = (ArrayList<ArrayList<String>>)o;

edited Jul 07 '14 at 10:10

answered Jul 07 '14 at 09:50

Pr38y

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Type safety: Unchecked cast from Serializable to ArrayList> – Hossein Amini Jul 07 '14 at 10:07
it returns null value for HoldAllData in the second activity – Hossein Amini Jul 07 '14 at 10:10
what is the key name you are giving ?Make sure HoldAllData in the first activity is not null. – Pr38y Jul 07 '14 at 10:12
it is not, it has all row which i want. the key name is set to "mykey" in both activities – Hossein Amini Jul 07 '14 at 10:12
serializable is not good for android performance wise use parceable – Illegal Argument Jul 07 '14 at 10:13
@HosseinAmini are you setting the bundle in the intent? show your code please. – Pr38y Jul 07 '14 at 10:14
Intent intent = new Intent(ReportsDialog.this, ReportsActivity.class); Bundle mybundle = new Bundle(); mybundle.putSerializable("mykey", HoldAllData ); intent.putExtras(mybundle); startActivity(intent); – Hossein Amini Jul 07 '14 at 10:15
@IllegalArgument yes parceable is better in terms of performance. – Pr38y Jul 07 '14 at 10:15
@HosseinAmini how are you retrieving in the ReportsActivity? – Pr38y Jul 07 '14 at 10:16
Bundle bundle = new Bundle(); ArrayList> HoldAllData = new ArrayList>(); HoldAllData = (ArrayList>) bundle.getSerializable("mykey"); – Hossein Amini Jul 07 '14 at 10:17
You are creating a new bundle, it will not contain anything. Fetch from the bundle send by previous activity. Change the first line `Bundle bundle = new Bundle();` to `Bundle bundle = getIntent().getExtras();` – Pr38y Jul 07 '14 at 10:23

pass ArrayList> to another activity

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