I can't get object from one Activity to another (android)

Question

I want to pass my object oManagement from activity X to Y.

In X:

oManagement = new OrdersManagement(); myIntent = new Intent(this, Y.class);

Then I fill my oManagement object with separate thread.

Then I am waiting when oManagement filled and start another activity:

while (oManagement.allOrders.size() == 0) { try { Thread.sleep(5); } catch (InterruptedException e) { e.printStackTrace(); } if (oManagement.allOrders.size() > 0) { myIntent.putExtra("OrdersManagementObject", oManagement); this.startActivity(myIntent); } }

And in my Y Activity:

Bundle b = this.getIntent().getExtras(); if (b != null) { oManagement = b.getParcelable("OrdersManagementObject"); }

And now surprise -> oManagement is not null, but oManagement.allOrders.size() is 0! :( So i pass my object, but ArrayList inside by object is 0 (in moment of passing was 1 element inside that Array).

How to fix that?

EDIT:

OrdersManagement class:

public class OrdersManagement implements Parcelable { public ArrayList<QuantorsOrder> allOrders = new ArrayList<QuantorsOrder>(); public OrdersManagement() { } public OrdersManagement(Parcel in) { } public static final Creator<OrdersManagement> CREATOR = new Creator<OrdersManagement>() { @Override public OrdersManagement createFromParcel(Parcel in) { return new OrdersManagement(in); } @Override public OrdersManagement[] newArray(int size) { return new OrdersManagement[size]; } }; public void updateListOfOrders(JSONArray jsonArray) throws JSONException { if (jsonArray != null && jsonArray.length() > 0) { JSONObject json; for (int i = 0; i < jsonArray.length(); i++) { json = (JSONObject)jsonArray.get(i); if(!IsOrderAlreadyExists(json)) addOrder(json); } } } private boolean IsOrderAlreadyExists(JSONObject json) throws JSONException { if (allOrders.isEmpty()) return false; else { for(QuantorsOrder order : allOrders) { if (String.valueOf(order.getId()).equals(json.get("id").toString())) { return true; } } return false; } } private void addOrder(JSONObject json) throws JSONException { allOrders.add(new QuantorsOrder(json)); } @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel dest, int flags) { } }

We probably need to see the source for the OrdersManagement class. Possible that there is a parceling problem there. — emerssso
– emerssso, Commented Sep 13, 2016 at 16:21
It appears your startActivity() resides in an infinite loop — Shaishav
– Shaishav, Commented Sep 13, 2016 at 16:26
check how you are extracting the key in your second activity. I will declare the key like this in first activity. public final static String EXTRA_ORDERSMANAGEMENT = "OrdersManagementObject"; Then i will extract the key in second activity like this Bundle b = this.getIntent().getExtras(MainActivity.EXTRA_ORDERSMANAGEMENT); — Abhinay Reddy Keesara
– Abhinay Reddy Keesara, Commented Sep 13, 2016 at 16:27
How does while (oManagement.allOrders.size() == 0) work when you have if (oManagement.allOrders.size() > 0) inside that loop? — OneCricketeer
– OneCricketeer, Commented Sep 13, 2016 at 16:30

Vitaliy Shuba · Accepted Answer · 2016-09-13 16:50:14Z

Your QuantorsOrdershould also implement Parcelable. And in writeToParcel() method you should write the list and read it in constructor like this:

public void writeToParcel(Parcel out, int flags) { out.writeTypedList(allOrders); } private OrdersManagement (Parcel in) { in.readTypedList(allOrders, QuantorsOrder.CREATOR); }

You should also implement the logic of writing and reading field in your QuantorsOrder class. Here is example on simple class:

 public class MyParcelable implements Parcelable { private int mData; public int describeContents() { return 0; } public void writeToParcel(Parcel out, int flags) { out.writeInt(mData); } public static final Parcelable.Creator<MyParcelable> CREATOR = new Parcelable.Creator<MyParcelable>() { public MyParcelable createFromParcel(Parcel in) { return new MyParcelable(in); } public MyParcelable[] newArray(int size) { return new MyParcelable[size]; } }; public MyParcelable(Parcel in) { mData = in.readInt(); } }

The main thing here is happening in writeToParcel(...) method and in constructor public MyParcelable(Parcel in).

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